text: /*!
   * jquery.fancytree.js
   * Tree view control with support for lazy loading and much more.
   * https://github.com/mar10/fancytree/
   *
   * Copyright (c) 2008-2020, Martin Wendt (https://wwWendt.de)
   * Released under the MIT license
   * https://github.com/mar10/fancytree/wiki/LicenseInfo
   *
   * @version @VERSION
   * @date @DATE
   */
  
  /** Core Fancytree module.
   */
  
  // UMD wrapper for the Fancytree core module
  (function(factory) {
  	if (typeof define === "function" && define.amd) {
  		// AMD. Register as an anonymous module.
  		define(["jquery", "./jquery.fancytree.ui-deps"], factory);
  	} else if (typeof module === "object" && module.exports) {
  		// Node/CommonJS
  		require("./jquery.fancytree.ui-deps");
  		module.exports = factory(require("jquery"));
  	} else {
  		// Browser globals
  		factory(jQuery);
  	}
  })(function($) {
  	"use strict";
  
  	// prevent duplicate loading
  	if ($.ui && $.ui.fancytree) {
  		$.ui.fancytree.warn("Fancytree: ignored duplicate include");
  		return;
  	}
  
  	/******************************************************************************
  	 * Private functions and variables
  	 */
  
  	var i,
  		attr,
  		FT = null, // initialized below
  		TEST_IMG = new RegExp(/\.|\//), // strings are considered image urls if they contain '.' or '/'
  		REX_HTML = /[&<>"'/]/g, // Escape those characters
  		REX_TOOLTIP = /[<>"'/]/g, // Don't escape `&` in tooltips
  		RECURSIVE_REQUEST_ERROR = "$recursive_request",
  		INVALID_REQUEST_TARGET_ERROR = "$request_target_invalid",
  		ENTITY_MAP = {
  			"&": "&amp;",
  			"<": "&lt;",
  			">": "&gt;",
  			'"': "&quot;",
  			"'": "&#39;",
  			"/": "&#x2F;",
  		},
  		IGNORE_KEYCODES = { 16: true, 17: true, 18: true },
  		SPECIAL_KEYCODES = {
  			8: "backspace",
  			9: "tab",
  			10: "return",
  			13: "return",
  			// 16: null, 17: null, 18: null,  // ignore shift, ctrl, alt
  			19: "pause",
  			20: "capslock",
  			27: "esc",
  			32: "space",
  			33: "pageup",
  			34: "pagedown",
  			35: "end",
  			36: "home",
  			37: "left",
  			38: "up",
  			39: "right",
  			40: "down",
  			45: "insert",
  			46: "del",
  			59: ";",
  			61: "=",
  			// 91: null, 93: null,  // ignore left and right meta
  			96: "0",
  			97: "1",
  			98: "2",
  			99: "3",
  			100: "4",
  			101: "5",
  			102: "6",
  			103: "7",
  			104: "8",
  			105: "9",
  			106: "*",
  			107: "+",
  			109: "-",
  			110: ".",
  			111: "/",
  			112: "f1",
  			113: "f2",
  			114: "f3",
  			115: "f4",
  			116: "f5",
  			117: "f6",
  			118: "f7",
  			119: "f8",
  			120: "f9",
  			121: "f10",
  			122: "f11",
  			123: "f12",
  			144: "numlock",
  			145: "scroll",
  			173: "-",
  			186: ";",
  			187: "=",
  			188: ",",
  			189: "-",
  			190: ".",
  			191: "/",
  			192: "`",
  			219: "[",
  			220: "\\",
  			221: "]",
  			222: "'",
  		},
  		MODIFIERS = {
  			16: "shift",
  			17: "ctrl",
  			18: "alt",
  			91: "meta",
  			93: "meta",
  		},
  		MOUSE_BUTTONS = { 0: "", 1: "left", 2: "middle", 3: "right" },
  		// Boolean attributes that can be set with equivalent class names in the LI tags
  		// Note: v2.23: checkbox and hideCheckbox are *not* in this list
  		CLASS_ATTRS = "active expanded focus folder lazy radiogroup selected unselectable unselectableIgnore".split(
  			" "
  		),
  		CLASS_ATTR_MAP = {},
  		// Top-level Fancytree attributes, that can be set by dict
  		TREE_ATTRS = "columns types".split(" "),
  		// TREE_ATTR_MAP = {},
  		// Top-level FancytreeNode attributes, that can be set by dict
  		NODE_ATTRS = "checkbox expanded extraClasses folder icon iconTooltip key lazy partsel radiogroup refKey selected statusNodeType title tooltip type unselectable unselectableIgnore unselectableStatus".split(
  			" "
  		),
  		NODE_ATTR_MAP = {},
  		// Mapping of lowercase -> real name (because HTML5 data-... attribute only supports lowercase)
  		NODE_ATTR_LOWERCASE_MAP = {},
  		// Attribute names that should NOT be added to node.data
  		NONE_NODE_DATA_MAP = {
  			active: true,
  			children: true,
  			data: true,
  			focus: true,
  		};
  
  	for (i = 0; i < CLASS_ATTRS.length; i++) {
  		CLASS_ATTR_MAP[CLASS_ATTRS[i]] = true;
  	}
  	for (i = 0; i < NODE_ATTRS.length; i++) {
  		attr = NODE_ATTRS[i];
  		NODE_ATTR_MAP[attr] = true;
  		if (attr !== attr.toLowerCase()) {
  			NODE_ATTR_LOWERCASE_MAP[attr.toLowerCase()] = attr;
  		}
  	}
  	// for(i=0; i<TREE_ATTRS.length; i++) {
  	// 	TREE_ATTR_MAP[TREE_ATTRS[i]] = true;
  	// }
  
  	function _assert(cond, msg) {
  		// TODO: see qunit.js extractStacktrace()
  		if (!cond) {
  			msg = msg ? ": " + msg : "";
  			// consoleApply("assert", [!!cond, msg]);
  			$.error("Fancytree assertion failed" + msg);
  		}
  	}
  
  	_assert($.ui, "Fancytree requires jQuery UI (http://jqueryui.com)");
  
  	function consoleApply(method, args) {
  		var i,
  			s,
  			fn = window.console ? window.console[method] : null;
  
  		if (fn) {
  			try {
  				fn.apply(window.console, args);
  			} catch (e) {
  				// IE 8?
  				s = "";
  				for (i = 0; i < args.length; i++) {
  					s += args[i];
  				}
  				fn(s);
  			}
  		}
  	}
  
  	/* support: IE8 Polyfil for Date.now() */
  	if (!Date.now) {
  		Date.now = function now() {
  			return new Date().getTime();
  		};
  	}
  
  	/*Return true if x is a FancytreeNode.*/
  	function _isNode(x) {
  		return !!(x.tree && x.statusNodeType !== undefined);
  	}
  
  	/** Return true if dotted version string is equal or higher than requested version.
  	 *
  	 * See http://jsfiddle.net/mar10/FjSAN/
  	 */
  	function isVersionAtLeast(dottedVersion, major, minor, patch) {
  		var i,
  			v,
  			t,
  			verParts = $.map($.trim(dottedVersion).split("."), function(e) {
  				return parseInt(e, 10);
  			}),
  			testParts = $.map(
  				Array.prototype.slice.call(arguments, 1),
  				function(e) {
  					return parseInt(e, 10);
  				}
  			);
  
  		for (i = 0; i < testParts.length; i++) {
  			v = verParts[i] || 0;
  			t = testParts[i] || 0;
  			if (v !== t) {
  				return v > t;
  			}
  		}
  		return true;
  	}
  
  	/**
  	 * Deep-merge a list of objects (but replace array-type options).
  	 *
  	 * jQuery's $.extend(true, ...) method does a deep merge, that also merges Arrays.
  	 * This variant is used to merge extension defaults with user options, and should
  	 * merge objects, but override arrays (for example the `triggerStart: [...]` option
  	 * of ext-edit). Also `null` values are copied over and not skipped.
  	 *
  	 * See issue #876
  	 *
  	 * Example:
  	 * _simpleDeepMerge({}, o1, o2);
  	 */
  	function _simpleDeepMerge() {
  		var options,
  			name,
  			src,
  			copy,
  			clone,
  			target = arguments[0] || {},
  			i = 1,
  			length = arguments.length;
  
  		// Handle case when target is a string or something (possible in deep copy)
  		if (typeof target !== "object" && !$.isFunction(target)) {
  			target = {};
  		}
  		if (i === length) {
  			throw Error("need at least two args");
  		}
  		for (; i < length; i++) {
  			// Only deal with non-null/undefined values
  			if ((options = arguments[i]) != null) {
  				// Extend the base object
  				for (name in options) {
  					if (options.hasOwnProperty(name)) {
  						src = target[name];
  						copy = options[name];
  						// Prevent never-ending loop
  						if (target === copy) {
  							continue;
  						}
  						// Recurse if we're merging plain objects
  						// (NOTE: unlike $.extend, we don't merge arrays, but replace them)
  						if (copy && $.isPlainObject(copy)) {
  							clone = src && $.isPlainObject(src) ? src : {};
  							// Never move original objects, clone them
  							target[name] = _simpleDeepMerge(clone, copy);
  							// Don't bring in undefined values
  						} else if (copy !== undefined) {
  							target[name] = copy;
  						}
  					}
  				}
  			}
  		}
  		// Return the modified object
  		return target;
  	}
  
  	/** Return a wrapper that calls sub.methodName() and exposes
  	 *  this             : tree
  	 *  this._local      : tree.ext.EXTNAME
  	 *  this._super      : base.methodName.call()
  	 *  this._superApply : base.methodName.apply()
  	 */
  	function _makeVirtualFunction(methodName, tree, base, extension, extName) {
  		// $.ui.fancytree.debug("_makeVirtualFunction", methodName, tree, base, extension, extName);
  		// if(rexTestSuper && !rexTestSuper.test(func)){
  		//     // extension.methodName() doesn't call _super(), so no wrapper required
  		//     return func;
  		// }
  		// Use an immediate function as closure
  		var proxy = (function() {
  			var prevFunc = tree[methodName], // org. tree method or prev. proxy
  				baseFunc = extension[methodName], //
  				_local = tree.ext[extName],
  				_super = function() {
  					return prevFunc.apply(tree, arguments);
  				},
  				_superApply = function(args) {
  					return prevFunc.apply(tree, args);
  				};
  
  			// Return the wrapper function
  			return function() {
  				var prevLocal = tree._local,
  					prevSuper = tree._super,
  					prevSuperApply = tree._superApply;
  
  				try {
  					tree._local = _local;
  					tree._super = _super;
  					tree._superApply = _superApply;
  					return baseFunc.apply(tree, arguments);
  				} finally {
  					tree._local = prevLocal;
  					tree._super = prevSuper;
  					tree._superApply = prevSuperApply;
  				}
  			};
  		})(); // end of Immediate Function
  		return proxy;
  	}
  
  	/**
  	 * Subclass `base` by creating proxy functions
  	 */
  	function _subclassObject(tree, base, extension, extName) {
  		// $.ui.fancytree.debug("_subclassObject", tree, base, extension, extName);
  		for (var attrName in extension) {
  			if (typeof extension[attrName] === "function") {
  				if (typeof tree[attrName] === "function") {
  					// override existing method
  					tree[attrName] = _makeVirtualFunction(
  						attrName,
  						tree,
  						base,
  						extension,
  						extName
  					);
  				} else if (attrName.charAt(0) === "_") {
  					// Create private methods in tree.ext.EXTENSION namespace
  					tree.ext[extName][attrName] = _makeVirtualFunction(
  						attrName,
  						tree,
  						base,
  						extension,
  						extName
  					);
  				} else {
  					$.error(
  						"Could not override tree." +
  							attrName +
  							". Use prefix '_' to create tree." +
  							extName +
  							"._" +
  							attrName
  					);
  				}
  			} else {
  				// Create member variables in tree.ext.EXTENSION namespace
  				if (attrName !== "options") {
  					tree.ext[extName][attrName] = extension[attrName];
  				}
  			}
  		}
  	}
  
  	function _getResolvedPromise(context, argArray) {
  		if (context === undefined) {
  			return $.Deferred(function() {
  				this.resolve();
  			}).promise();
  		}
  		return $.Deferred(function() {
  			this.resolveWith(context, argArray);
  		}).promise();
  	}
  
  	function _getRejectedPromise(context, argArray) {
  		if (context === undefined) {
  			return $.Deferred(function() {
  				this.reject();
  			}).promise();
  		}
  		return $.Deferred(function() {
  			this.rejectWith(context, argArray);
  		}).promise();
  	}
  
  	function _makeResolveFunc(deferred, context) {
  		return function() {
  			deferred.resolveWith(context);
  		};
  	}
  
  	function _getElementDataAsDict($el) {
  		// Evaluate 'data-NAME' attributes with special treatment for 'data-json'.
  		var d = $.extend({}, $el.data()),
  			json = d.json;
  
  		delete d.fancytree; // added to container by widget factory (old jQuery UI)
  		delete d.uiFancytree; // added to container by widget factory
  
  		if (json) {
  			delete d.json;
  			// <li data-json='...'> is already returned as object (http://api.jquery.com/data/#data-html5)
  			d = $.extend(d, json);
  		}
  		return d;
  	}
  
  	function _escapeTooltip(s) {
  		return ("" + s).replace(REX_TOOLTIP, function(s) {
  			return ENTITY_MAP[s];
  		});
  	}
  
  	// TODO: use currying
  	function _makeNodeTitleMatcher(s) {
  		s = s.toLowerCase();
  		return function(node) {
  			return node.title.toLowerCase().indexOf(s) >= 0;
  		};
  	}
  
  	function _makeNodeTitleStartMatcher(s) {
  		var reMatch = new RegExp("^" + s, "i");
  		return function(node) {
  			return reMatch.test(node.title);
  		};
  	}
  
  	/******************************************************************************
  	 * FancytreeNode
  	 */
  
  	/**
  	 * Creates a new FancytreeNode
  	 *
  	 * @class FancytreeNode
  	 * @classdesc A FancytreeNode represents the hierarchical data model and operations.
  	 *
  	 * @param {FancytreeNode} parent
  	 * @param {NodeData} obj
  	 *
  	 * @property {Fancytree} tree The tree instance
  	 * @property {FancytreeNode} parent The parent node
  	 * @property {string} key Node id (must be unique inside the tree)
  	 * @property {string} title Display name (may contain HTML)
  	 * @property {object} data Contains all extra data that was passed on node creation
  	 * @property {FancytreeNode[] | null | undefined} children Array of child nodes.<br>
  	 *     For lazy nodes, null or undefined means 'not yet loaded'. Use an empty array
  	 *     to define a node that has no children.
  	 * @property {boolean} expanded Use isExpanded(), setExpanded() to access this property.
  	 * @property {string} extraClasses Additional CSS classes, added to the node's `<span>`.<br>
  	 *     Note: use `node.add/remove/toggleClass()` to modify.
  	 * @property {boolean} folder Folder nodes have different default icons and click behavior.<br>
  	 *     Note: Also non-folders may have children.
  	 * @property {string} statusNodeType null for standard nodes. Otherwise type of special system node: 'error', 'loading', 'nodata', or 'paging'.
  	 * @property {boolean} lazy True if this node is loaded on demand, i.e. on first expansion.
  	 * @property {boolean} selected Use isSelected(), setSelected() to access this property.
  	 * @property {string} tooltip Alternative description used as hover popup
  	 * @property {string} iconTooltip Description used as hover popup for icon. @since 2.27
  	 * @property {string} type Node type, used with tree.types map. @since 2.27
  	 */
  	function FancytreeNode(parent, obj) {
  		var i, l, name, cl;
  
  		this.parent = parent;
  		this.tree = parent.tree;
  		this.ul = null;
  		this.li = null; // <li id='key' ftnode=this> tag
  		this.statusNodeType = null; // if this is a temp. node to display the status of its parent
  		this._isLoading = false; // if this node itself is loading
  		this._error = null; // {message: '...'} if a load error occurred
  		this.data = {};
  
  		// TODO: merge this code with node.toDict()
  		// copy attributes from obj object
  		for (i = 0, l = NODE_ATTRS.length; i < l; i++) {
  			name = NODE_ATTRS[i];
  			this[name] = obj[name];
  		}
  		// unselectableIgnore and unselectableStatus imply unselectable
  		if (
  			this.unselectableIgnore != null ||
  			this.unselectableStatus != null
  		) {
  			this.unselectable = true;
  		}
  		if (obj.hideCheckbox) {
  			$.error(
  				"'hideCheckbox' node option was removed in v2.23.0: use 'checkbox: false'"
  			);
  		}
  		// node.data += obj.data
  		if (obj.data) {
  			$.extend(this.data, obj.data);
  		}
  		// Copy all other attributes to this.data.NAME
  		for (name in obj) {
  			if (
  				!NODE_ATTR_MAP[name] &&
  				(this.tree.options.copyFunctionsToData ||
  					!$.isFunction(obj[name])) &&
  				!NONE_NODE_DATA_MAP[name]
  			) {
  				// node.data.NAME = obj.NAME
  				this.data[name] = obj[name];
  			}
  		}
  
  		// Fix missing key
  		if (this.key == null) {
  			// test for null OR undefined
  			if (this.tree.options.defaultKey) {
  				this.key = "" + this.tree.options.defaultKey(this);
  				_assert(this.key, "defaultKey() must return a unique key");
  			} else {
  				this.key = "_" + FT._nextNodeKey++;
  			}
  		} else {
  			this.key = "" + this.key; // Convert to string (#217)
  		}
  
  		// Fix tree.activeNode
  		// TODO: not elegant: we use obj.active as marker to set tree.activeNode
  		// when loading from a dictionary.
  		if (obj.active) {
  			_assert(
  				this.tree.activeNode === null,
  				"only one active node allowed"
  			);
  			this.tree.activeNode = this;
  		}
  		if (obj.selected) {
  			// #186
  			this.tree.lastSelectedNode = this;
  		}
  		// TODO: handle obj.focus = true
  
  		// Create child nodes
  		cl = obj.children;
  		if (cl) {
  			if (cl.length) {
  				this._setChildren(cl);
  			} else {
  				// if an empty array was passed for a lazy node, keep it, in order to mark it 'loaded'
  				this.children = this.lazy ? [] : null;
  			}
  		} else {
  			this.children = null;
  		}
  		// Add to key/ref map (except for root node)
  		//	if( parent ) {
  		this.tree._callHook("treeRegisterNode", this.tree, true, this);
  		//	}
  	}
  
  	FancytreeNode.prototype = /** @lends FancytreeNode# */ {
  		/* Return the direct child FancytreeNode with a given key, index. */
  		_findDirectChild: function(ptr) {
  			var i,
  				l,
  				cl = this.children;
  
  			if (cl) {
  				if (typeof ptr === "string") {
  					for (i = 0, l = cl.length; i < l; i++) {
  						if (cl[i].key === ptr) {
  							return cl[i];
  						}
  					}
  				} else if (typeof ptr === "number") {
  					return this.children[ptr];
  				} else if (ptr.parent === this) {
  					return ptr;
  				}
  			}
  			return null;
  		},
  		// TODO: activate()
  		// TODO: activateSilently()
  		/* Internal helper called in recursive addChildren sequence.*/
  		_setChildren: function(children) {
  			_assert(
  				children && (!this.children || this.children.length === 0),
  				"only init supported"
  			);
  			this.children = [];
  			for (var i = 0, l = children.length; i < l; i++) {
  				this.children.push(new FancytreeNode(this, children[i]));
  			}
  			this.tree._callHook(
  				"treeStructureChanged",
  				this.tree,
  				"setChildren"
  			);
  		},
  		/**
  		 * Append (or insert) a list of child nodes.
  		 *
  		 * @param {NodeData[]} children array of child node definitions (also single child accepted)
  		 * @param {FancytreeNode | string | Integer} [insertBefore] child node (or key or index of such).
  		 *     If omitted, the new children are appended.
  		 * @returns {FancytreeNode} first child added
  		 *
  		 * @see FancytreeNode#applyPatch
  		 */
  		addChildren: function(children, insertBefore) {
  			var i,
  				l,
  				pos,
  				origFirstChild = this.getFirstChild(),
  				origLastChild = this.getLastChild(),
  				firstNode = null,
  				nodeList = [];
  
  			if ($.isPlainObject(children)) {
  				children = [children];
  			}
  			if (!this.children) {
  				this.children = [];
  			}
  			for (i = 0, l = children.length; i < l; i++) {
  				nodeList.push(new FancytreeNode(this, children[i]));
  			}
  			firstNode = nodeList[0];
  			if (insertBefore == null) {
  				this.children = this.children.concat(nodeList);
  			} else {
  				// Returns null if insertBefore is not a direct child:
  				insertBefore = this._findDirectChild(insertBefore);
  				pos = $.inArray(insertBefore, this.children);
  				_assert(pos >= 0, "insertBefore must be an existing child");
  				// insert nodeList after children[pos]
  				this.children.splice.apply(
  					this.children,
  					[pos, 0].concat(nodeList)
  				);
  			}
  			if (origFirstChild && !insertBefore) {
  				// #708: Fast path -- don't render every child of root, just the new ones!
  				// #723, #729: but only if it's appended to an existing child list
  				for (i = 0, l = nodeList.length; i < l; i++) {
  					nodeList[i].render(); // New nodes were never rendered before
  				}
  				// Adjust classes where status may have changed
  				// Has a first child
  				if (origFirstChild !== this.getFirstChild()) {
  					// Different first child -- recompute classes
  					origFirstChild.renderStatus();
  				}
  				if (origLastChild !== this.getLastChild()) {
  					// Different last child -- recompute classes
  					origLastChild.renderStatus();
  				}
  			} else if (!this.parent || this.parent.ul || this.tr) {
  				// render if the parent was rendered (or this is a root node)
  				this.render();
  			}
  			if (this.tree.options.selectMode === 3) {
  				this.fixSelection3FromEndNodes();
  			}
  			this.triggerModifyChild(
  				"add",
  				nodeList.length === 1 ? nodeList[0] : null
  			);
  			return firstNode;
  		},
  		/**
  		 * Add class to node's span tag and to .extraClasses.
  		 *
  		 * @param {string} className class name
  		 *
  		 * @since 2.17
  		 */
  		addClass: function(className) {
  			return this.toggleClass(className, true);
  		},
  		/**
  		 * Append or prepend a node, or append a child node.
  		 *
  		 * This a convenience function that calls addChildren()
  		 *
  		 * @param {NodeData} node node definition
  		 * @param {string} [mode=child] 'before', 'after', 'firstChild', or 'child' ('over' is a synonym for 'child')
  		 * @returns {FancytreeNode} new node
  		 */
  		addNode: function(node, mode) {
  			if (mode === undefined || mode === "over") {
  				mode = "child";
  			}
  			switch (mode) {
  				case "after":
  					return this.getParent().addChildren(
  						node,
  						this.getNextSibling()
  					);
  				case "before":
  					return this.getParent().addChildren(node, this);
  				case "firstChild":
  					// Insert before the first child if any
  					var insertBefore = this.children ? this.children[0] : null;
  					return this.addChildren(node, insertBefore);
  				case "child":
  				case "over":
  					return this.addChildren(node);
  			}
  			_assert(false, "Invalid mode: " + mode);
  		},
  		/**Add child status nodes that indicate 'More...', etc.
  		 *
  		 * This also maintains the node's `partload` property.
  		 * @param {boolean|object} node optional node definition. Pass `false` to remove all paging nodes.
  		 * @param {string} [mode='child'] 'child'|firstChild'
  		 * @since 2.15
  		 */
  		addPagingNode: function(node, mode) {
  			var i, n;
  
  			mode = mode || "child";
  			if (node === false) {
  				for (i = this.children.length - 1; i >= 0; i--) {
  					n = this.children[i];
  					if (n.statusNodeType === "paging") {
  						this.removeChild(n);
  					}
  				}
  				this.partload = false;
  				return;
  			}
  			node = $.extend(
  				{
  					title: this.tree.options.strings.moreData,
  					statusNodeType: "paging",
  					icon: false,
  				},
  				node
  			);
  			this.partload = true;
  			return this.addNode(node, mode);
  		},
  		/**
  		 * Append new node after this.
  		 *
  		 * This a convenience function that calls addNode(node, 'after')
  		 *
  		 * @param {NodeData} node node definition
  		 * @returns {FancytreeNode} new node
  		 */
  		appendSibling: function(node) {
  			return this.addNode(node, "after");
  		},
  		/**
  		 * (experimental) Apply a modification (or navigation) operation.
  		 *
  		 * @param {string} cmd
  		 * @param {object} [opts]
  		 * @see Fancytree#applyCommand
  		 * @since 2.32
  		 */
  		applyCommand: function(cmd, opts) {
  			return this.tree.applyCommand(cmd, this, opts);
  		},
  		/**
  		 * Modify existing child nodes.
  		 *
  		 * @param {NodePatch} patch
  		 * @returns {$.Promise}
  		 * @see FancytreeNode#addChildren
  		 */
  		applyPatch: function(patch) {
  			// patch [key, null] means 'remove'
  			if (patch === null) {
  				this.remove();
  				return _getResolvedPromise(this);
  			}
  			// TODO: make sure that root node is not collapsed or modified
  			// copy (most) attributes to node.ATTR or node.data.ATTR
  			var name,
  				promise,
  				v,
  				IGNORE_MAP = { children: true, expanded: true, parent: true }; // TODO: should be global
  
  			for (name in patch) {
  				if (patch.hasOwnProperty(name)) {
  					v = patch[name];
  					if (!IGNORE_MAP[name] && !$.isFunction(v)) {
  						if (NODE_ATTR_MAP[name]) {
  							this[name] = v;
  						} else {
  							this.data[name] = v;
  						}
  					}
  				}
  			}
  			// Remove and/or create children
  			if (patch.hasOwnProperty("children")) {
  				this.removeChildren();
  				if (patch.children) {
  					// only if not null and not empty list
  					// TODO: addChildren instead?
  					this._setChildren(patch.children);
  				}
  				// TODO: how can we APPEND or INSERT child nodes?
  			}
  			if (this.isVisible()) {
  				this.renderTitle();
  				this.renderStatus();
  			}
  			// Expand collapse (final step, since this may be async)
  			if (patch.hasOwnProperty("expanded")) {
  				promise = this.setExpanded(patch.expanded);
  			} else {
  				promise = _getResolvedPromise(this);
  			}
  			return promise;
  		},
  		/** Collapse all sibling nodes.
  		 * @returns {$.Promise}
  		 */
  		collapseSiblings: function() {
  			return this.tree._callHook("nodeCollapseSiblings", this);
  		},
  		/** Copy this node as sibling or child of `node`.
  		 *
  		 * @param {FancytreeNode} node source node
  		 * @param {string} [mode=child] 'before' | 'after' | 'child'
  		 * @param {Function} [map] callback function(NodeData, FancytreeNode) that could modify the new node
  		 * @returns {FancytreeNode} new
  		 */
  		copyTo: function(node, mode, map) {
  			return node.addNode(this.toDict(true, map), mode);
  		},
  		/** Count direct and indirect children.
  		 *
  		 * @param {boolean} [deep=true] pass 'false' to only count direct children
  		 * @returns {int} number of child nodes
  		 */
  		countChildren: function(deep) {
  			var cl = this.children,
  				i,
  				l,
  				n;
  			if (!cl) {
  				return 0;
  			}
  			n = cl.length;
  			if (deep !== false) {
  				for (i = 0, l = n; i < l; i++) {
  					n += cl[i].countChildren();
  				}
  			}
  			return n;
  		},
  		// TODO: deactivate()
  		/** Write to browser console if debugLevel >= 4 (prepending node info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		debug: function(msg) {
  			if (this.tree.options.debugLevel >= 4) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("log", arguments);
  			}
  		},
  		/** Deprecated.
  		 * @deprecated since 2014-02-16. Use resetLazy() instead.
  		 */
  		discard: function() {
  			this.warn(
  				"FancytreeNode.discard() is deprecated since 2014-02-16. Use .resetLazy() instead."
  			);
  			return this.resetLazy();
  		},
  		/** Remove DOM elements for all descendents. May be called on .collapse event
  		 * to keep the DOM small.
  		 * @param {boolean} [includeSelf=false]
  		 */
  		discardMarkup: function(includeSelf) {
  			var fn = includeSelf ? "nodeRemoveMarkup" : "nodeRemoveChildMarkup";
  			this.tree._callHook(fn, this);
  		},
  		/** Write error to browser console if debugLevel >= 1 (prepending tree info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		error: function(msg) {
  			if (this.tree.options.debugLevel >= 1) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("error", arguments);
  			}
  		},
  		/**Find all nodes that match condition (excluding self).
  		 *
  		 * @param {string | function(node)} match title string to search for, or a
  		 *     callback function that returns `true` if a node is matched.
  		 * @returns {FancytreeNode[]} array of nodes (may be empty)
  		 */
  		findAll: function(match) {
  			match = $.isFunction(match) ? match : _makeNodeTitleMatcher(match);
  			var res = [];
  			this.visit(function(n) {
  				if (match(n)) {
  					res.push(n);
  				}
  			});
  			return res;
  		},
  		/**Find first node that matches condition (excluding self).
  		 *
  		 * @param {string | function(node)} match title string to search for, or a
  		 *     callback function that returns `true` if a node is matched.
  		 * @returns {FancytreeNode} matching node or null
  		 * @see FancytreeNode#findAll
  		 */
  		findFirst: function(match) {
  			match = $.isFunction(match) ? match : _makeNodeTitleMatcher(match);
  			var res = null;
  			this.visit(function(n) {
  				if (match(n)) {
  					res = n;
  					return false;
  				}
  			});
  			return res;
  		},
  		/** Find a node relative to self.
  		 *
  		 * @param {number|string} where The keyCode that would normally trigger this move,
  		 *		or a keyword ('down', 'first', 'last', 'left', 'parent', 'right', 'up').
  		 * @returns {FancytreeNode}
  		 * @since v2.31
  		 */
  		findRelatedNode: function(where, includeHidden) {
  			return this.tree.findRelatedNode(this, where, includeHidden);
  		},
  		/* Apply selection state (internal use only) */
  		_changeSelectStatusAttrs: function(state) {
  			var changed = false,
  				opts = this.tree.options,
  				unselectable = FT.evalOption(
  					"unselectable",
  					this,
  					this,
  					opts,
  					false
  				),
  				unselectableStatus = FT.evalOption(
  					"unselectableStatus",
  					this,
  					this,
  					opts,
  					undefined
  				);
  
  			if (unselectable && unselectableStatus != null) {
  				state = unselectableStatus;
  			}
  			switch (state) {
  				case false:
  					changed = this.selected || this.partsel;
  					this.selected = false;
  					this.partsel = false;
  					break;
  				case true:
  					changed = !this.selected || !this.partsel;
  					this.selected = true;
  					this.partsel = true;
  					break;
  				case undefined:
  					changed = this.selected || !this.partsel;
  					this.selected = false;
  					this.partsel = true;
  					break;
  				default:
  					_assert(false, "invalid state: " + state);
  			}
  			// this.debug("fixSelection3AfterLoad() _changeSelectStatusAttrs()", state, changed);
  			if (changed) {
  				this.renderStatus();
  			}
  			return changed;
  		},
  		/**
  		 * Fix selection status, after this node was (de)selected in multi-hier mode.
  		 * This includes (de)selecting all children.
  		 */
  		fixSelection3AfterClick: function(callOpts) {
  			var flag = this.isSelected();
  
  			// this.debug("fixSelection3AfterClick()");
  
  			this.visit(function(node) {
  				node._changeSelectStatusAttrs(flag);
  				if (node.radiogroup) {
  					// #931: don't (de)select this branch
  					return "skip";
  				}
  			});
  			this.fixSelection3FromEndNodes(callOpts);
  		},
  		/**
  		 * Fix selection status for multi-hier mode.
  		 * Only end-nodes are considered to update the descendants branch and parents.
  		 * Should be called after this node has loaded new children or after
  		 * children have been modified using the API.
  		 */
  		fixSelection3FromEndNodes: function(callOpts) {
  			var opts = this.tree.options;
  
  			// this.debug("fixSelection3FromEndNodes()");
  			_assert(opts.selectMode === 3, "expected selectMode 3");
  
  			// Visit all end nodes and adjust their parent's `selected` and `partsel`
  			// attributes. Return selection state true, false, or undefined.
  			function _walk(node) {
  				var i,
  					l,
  					child,
  					s,
  					state,
  					allSelected,
  					someSelected,
  					unselIgnore,
  					unselState,
  					children = node.children;
  
  				if (children && children.length) {
  					// check all children recursively
  					allSelected = true;
  					someSelected = false;
  
  					for (i = 0, l = children.length; i < l; i++) {
  						child = children[i];
  						// the selection state of a node is not relevant; we need the end-nodes
  						s = _walk(child);
  						// if( !child.unselectableIgnore ) {
  						unselIgnore = FT.evalOption(
  							"unselectableIgnore",
  							child,
  							child,
  							opts,
  							false
  						);
  						if (!unselIgnore) {
  							if (s !== false) {
  								someSelected = true;
  							}
  							if (s !== true) {
  								allSelected = false;
  							}
  						}
  					}
  					// eslint-disable-next-line no-nested-ternary
  					state = allSelected
  						? true
  						: someSelected
  						? undefined
  						: false;
  				} else {
  					// This is an end-node: simply report the status
  					unselState = FT.evalOption(
  						"unselectableStatus",
  						node,
  						node,
  						opts,
  						undefined
  					);
  					state = unselState == null ? !!node.selected : !!unselState;
  				}
  				// #939: Keep a `partsel` flag that was explicitly set on a lazy node
  				if (
  					node.partsel &&
  					!node.selected &&
  					node.lazy &&
  					node.children == null
  				) {
  					state = undefined;
  				}
  				node._changeSelectStatusAttrs(state);
  				return state;
  			}
  			_walk(this);
  
  			// Update parent's state
  			this.visitParents(function(node) {
  				var i,
  					l,
  					child,
  					state,
  					unselIgnore,
  					unselState,
  					children = node.children,
  					allSelected = true,
  					someSelected = false;
  
  				for (i = 0, l = children.length; i < l; i++) {
  					child = children[i];
  					unselIgnore = FT.evalOption(
  						"unselectableIgnore",
  						child,
  						child,
  						opts,
  						false
  					);
  					if (!unselIgnore) {
  						unselState = FT.evalOption(
  							"unselectableStatus",
  							child,
  							child,
  							opts,
  							undefined
  						);
  						state =
  							unselState == null
  								? !!child.selected
  								: !!unselState;
  						// When fixing the parents, we trust the sibling status (i.e.
  						// we don't recurse)
  						if (state || child.partsel) {
  							someSelected = true;
  						}
  						if (!state) {
  							allSelected = false;
  						}
  					}
  				}
  				// eslint-disable-next-line no-nested-ternary
  				state = allSelected ? true : someSelected ? undefined : false;
  				node._changeSelectStatusAttrs(state);
  			});
  		},
  		// TODO: focus()
  		/**
  		 * Update node data. If dict contains 'children', then also replace
  		 * the hole sub tree.
  		 * @param {NodeData} dict
  		 *
  		 * @see FancytreeNode#addChildren
  		 * @see FancytreeNode#applyPatch
  		 */
  		fromDict: function(dict) {
  			// copy all other attributes to this.data.xxx
  			for (var name in dict) {
  				if (NODE_ATTR_MAP[name]) {
  					// node.NAME = dict.NAME
  					this[name] = dict[name];
  				} else if (name === "data") {
  					// node.data += dict.data
  					$.extend(this.data, dict.data);
  				} else if (
  					!$.isFunction(dict[name]) &&
  					!NONE_NODE_DATA_MAP[name]
  				) {
  					// node.data.NAME = dict.NAME
  					this.data[name] = dict[name];
  				}
  			}
  			if (dict.children) {
  				// recursively set children and render
  				this.removeChildren();
  				this.addChildren(dict.children);
  			}
  			this.renderTitle();
  			/*
  			var children = dict.children;
  			if(children === undefined){
  				this.data = $.extend(this.data, dict);
  				this.render();
  				return;
  			}
  			dict = $.extend({}, dict);
  			dict.children = undefined;
  			this.data = $.extend(this.data, dict);
  			this.removeChildren();
  			this.addChild(children);
  			*/
  		},
  		/** Return the list of child nodes (undefined for unexpanded lazy nodes).
  		 * @returns {FancytreeNode[] | undefined}
  		 */
  		getChildren: function() {
  			if (this.hasChildren() === undefined) {
  				// TODO: only required for lazy nodes?
  				return undefined; // Lazy node: unloaded, currently loading, or load error
  			}
  			return this.children;
  		},
  		/** Return the first child node or null.
  		 * @returns {FancytreeNode | null}
  		 */
  		getFirstChild: function() {
  			return this.children ? this.children[0] : null;
  		},
  		/** Return the 0-based child index.
  		 * @returns {int}
  		 */
  		getIndex: function() {
  			// return this.parent.children.indexOf(this);
  			return $.inArray(this, this.parent.children); // indexOf doesn't work in IE7
  		},
  		/** Return the hierarchical child index (1-based, e.g. '3.2.4').
  		 * @param {string} [separator="."]
  		 * @param {int} [digits=1]
  		 * @returns {string}
  		 */
  		getIndexHier: function(separator, digits) {
  			separator = separator || ".";
  			var s,
  				res = [];
  			$.each(this.getParentList(false, true), function(i, o) {
  				s = "" + (o.getIndex() + 1);
  				if (digits) {
  					// prepend leading zeroes
  					s = ("0000000" + s).substr(-digits);
  				}
  				res.push(s);
  			});
  			return res.join(separator);
  		},
  		/** Return the parent keys separated by options.keyPathSeparator, e.g. "/id_1/id_17/id_32".
  		 *
  		 * (Unlike `node.getPath()`, this method prepends a "/" and inverts the first argument.)
  		 *
  		 * @see FancytreeNode#getPath
  		 * @param {boolean} [excludeSelf=false]
  		 * @returns {string}
  		 */
  		getKeyPath: function(excludeSelf) {
  			var sep = this.tree.options.keyPathSeparator;
  
  			return sep + this.getPath(!excludeSelf, "key", sep);
  		},
  		/** Return the last child of this node or null.
  		 * @returns {FancytreeNode | null}
  		 */
  		getLastChild: function() {
  			return this.children
  				? this.children[this.children.length - 1]
  				: null;
  		},
  		/** Return node depth. 0: System root node, 1: visible top-level node, 2: first sub-level, ... .
  		 * @returns {int}
  		 */
  		getLevel: function() {
  			var level = 0,
  				dtn = this.parent;
  			while (dtn) {
  				level++;
  				dtn = dtn.parent;
  			}
  			return level;
  		},
  		/** Return the successor node (under the same parent) or null.
  		 * @returns {FancytreeNode | null}
  		 */
  		getNextSibling: function() {
  			// TODO: use indexOf, if available: (not in IE6)
  			if (this.parent) {
  				var i,
  					l,
  					ac = this.parent.children;
  
  				for (i = 0, l = ac.length - 1; i < l; i++) {
  					// up to length-2, so next(last) = null
  					if (ac[i] === this) {
  						return ac[i + 1];
  					}
  				}
  			}
  			return null;
  		},
  		/** Return the parent node (null for the system root node).
  		 * @returns {FancytreeNode | null}
  		 */
  		getParent: function() {
  			// TODO: return null for top-level nodes?
  			return this.parent;
  		},
  		/** Return an array of all parent nodes (top-down).
  		 * @param {boolean} [includeRoot=false] Include the invisible system root node.
  		 * @param {boolean} [includeSelf=false] Include the node itself.
  		 * @returns {FancytreeNode[]}
  		 */
  		getParentList: function(includeRoot, includeSelf) {
  			var l = [],
  				dtn = includeSelf ? this : this.parent;
  			while (dtn) {
  				if (includeRoot || dtn.parent) {
  					l.unshift(dtn);
  				}
  				dtn = dtn.parent;
  			}
  			return l;
  		},
  		/** Return a string representing the hierachical node path, e.g. "a/b/c".
  		 * @param {boolean} [includeSelf=true]
  		 * @param {string | function} [part="title"] node property name or callback
  		 * @param {string} [separator="/"]
  		 * @returns {string}
  		 * @since v2.31
  		 */
  		getPath: function(includeSelf, part, separator) {
  			includeSelf = includeSelf !== false;
  			part = part || "title";
  			separator = separator || "/";
  
  			var val,
  				path = [],
  				isFunc = $.isFunction(part);
  
  			this.visitParents(function(n) {
  				if (n.parent) {
  					val = isFunc ? part(n) : n[part];
  					path.unshift(val);
  				}
  			}, includeSelf);
  			return path.join(separator);
  		},
  		/** Return the predecessor node (under the same parent) or null.
  		 * @returns {FancytreeNode | null}
  		 */
  		getPrevSibling: function() {
  			if (this.parent) {
  				var i,
  					l,
  					ac = this.parent.children;
  
  				for (i = 1, l = ac.length; i < l; i++) {
  					// start with 1, so prev(first) = null
  					if (ac[i] === this) {
  						return ac[i - 1];
  					}
  				}
  			}
  			return null;
  		},
  		/**
  		 * Return an array of selected descendant nodes.
  		 * @param {boolean} [stopOnParents=false] only return the topmost selected
  		 *     node (useful with selectMode 3)
  		 * @returns {FancytreeNode[]}
  		 */
  		getSelectedNodes: function(stopOnParents) {
  			var nodeList = [];
  			this.visit(function(node) {
  				if (node.selected) {
  					nodeList.push(node);
  					if (stopOnParents === true) {
  						return "skip"; // stop processing this branch
  					}
  				}
  			});
  			return nodeList;
  		},
  		/** Return true if node has children. Return undefined if not sure, i.e. the node is lazy and not yet loaded).
  		 * @returns {boolean | undefined}
  		 */
  		hasChildren: function() {
  			if (this.lazy) {
  				if (this.children == null) {
  					// null or undefined: Not yet loaded
  					return undefined;
  				} else if (this.children.length === 0) {
  					// Loaded, but response was empty
  					return false;
  				} else if (
  					this.children.length === 1 &&
  					this.children[0].isStatusNode()
  				) {
  					// Currently loading or load error
  					return undefined;
  				}
  				return true;
  			}
  			return !!(this.children && this.children.length);
  		},
  		/**
  		 * Return true if node has `className` defined in .extraClasses.
  		 *
  		 * @param {string} className class name (separate multiple classes by space)
  		 * @returns {boolean}
  		 *
  		 * @since 2.32
  		 */
  		hasClass: function(className) {
  			return (
  				(" " + (this.extraClasses || "") + " ").indexOf(
  					" " + className + " "
  				) >= 0
  			);
  		},
  		/** Return true if node has keyboard focus.
  		 * @returns {boolean}
  		 */
  		hasFocus: function() {
  			return this.tree.hasFocus() && this.tree.focusNode === this;
  		},
  		/** Write to browser console if debugLevel >= 3 (prepending node info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		info: function(msg) {
  			if (this.tree.options.debugLevel >= 3) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("info", arguments);
  			}
  		},
  		/** Return true if node is active (see also FancytreeNode#isSelected).
  		 * @returns {boolean}
  		 */
  		isActive: function() {
  			return this.tree.activeNode === this;
  		},
  		/** Return true if node is vertically below `otherNode`, i.e. rendered in a subsequent row.
  		 * @param {FancytreeNode} otherNode
  		 * @returns {boolean}
  		 * @since 2.28
  		 */
  		isBelowOf: function(otherNode) {
  			return this.getIndexHier(".", 5) > otherNode.getIndexHier(".", 5);
  		},
  		/** Return true if node is a direct child of otherNode.
  		 * @param {FancytreeNode} otherNode
  		 * @returns {boolean}
  		 */
  		isChildOf: function(otherNode) {
  			return this.parent && this.parent === otherNode;
  		},
  		/** Return true, if node is a direct or indirect sub node of otherNode.
  		 * @param {FancytreeNode} otherNode
  		 * @returns {boolean}
  		 */
  		isDescendantOf: function(otherNode) {
  			if (!otherNode || otherNode.tree !== this.tree) {
  				return false;
  			}
  			var p = this.parent;
  			while (p) {
  				if (p === otherNode) {
  					return true;
  				}
  				if (p === p.parent) {
  					$.error("Recursive parent link: " + p);
  				}
  				p = p.parent;
  			}
  			return false;
  		},
  		/** Return true if node is expanded.
  		 * @returns {boolean}
  		 */
  		isExpanded: function() {
  			return !!this.expanded;
  		},
  		/** Return true if node is the first node of its parent's children.
  		 * @returns {boolean}
  		 */
  		isFirstSibling: function() {
  			var p = this.parent;
  			return !p || p.children[0] === this;
  		},
  		/** Return true if node is a folder, i.e. has the node.folder attribute set.
  		 * @returns {boolean}
  		 */
  		isFolder: function() {
  			return !!this.folder;
  		},
  		/** Return true if node is the last node of its parent's children.
  		 * @returns {boolean}
  		 */
  		isLastSibling: function() {
  			var p = this.parent;
  			return !p || p.children[p.children.length - 1] === this;
  		},
  		/** Return true if node is lazy (even if data was already loaded)
  		 * @returns {boolean}
  		 */
  		isLazy: function() {
  			return !!this.lazy;
  		},
  		/** Return true if node is lazy and loaded. For non-lazy nodes always return true.
  		 * @returns {boolean}
  		 */
  		isLoaded: function() {
  			return !this.lazy || this.hasChildren() !== undefined; // Also checks if the only child is a status node
  		},
  		/** Return true if children are currently beeing loaded, i.e. a Ajax request is pending.
  		 * @returns {boolean}
  		 */
  		isLoading: function() {
  			return !!this._isLoading;
  		},
  		/*
  		 * @deprecated since v2.4.0:  Use isRootNode() instead
  		 */
  		isRoot: function() {
  			return this.isRootNode();
  		},
  		/** Return true if node is partially selected (tri-state).
  		 * @returns {boolean}
  		 * @since 2.23
  		 */
  		isPartsel: function() {
  			return !this.selected && !!this.partsel;
  		},
  		/** (experimental) Return true if this is partially loaded.
  		 * @returns {boolean}
  		 * @since 2.15
  		 */
  		isPartload: function() {
  			return !!this.partload;
  		},
  		/** Return true if this is the (invisible) system root node.
  		 * @returns {boolean}
  		 * @since 2.4
  		 */
  		isRootNode: function() {
  			return this.tree.rootNode === this;
  		},
  		/** Return true if node is selected, i.e. has a checkmark set (see also FancytreeNode#isActive).
  		 * @returns {boolean}
  		 */
  		isSelected: function() {
  			return !!this.selected;
  		},
  		/** Return true if this node is a temporarily generated system node like
  		 * 'loading', 'paging', or 'error' (node.statusNodeType contains the type).
  		 * @returns {boolean}
  		 */
  		isStatusNode: function() {
  			return !!this.statusNodeType;
  		},
  		/** Return true if this node is a status node of type 'paging'.
  		 * @returns {boolean}
  		 * @since 2.15
  		 */
  		isPagingNode: function() {
  			return this.statusNodeType === "paging";
  		},
  		/** Return true if this a top level node, i.e. a direct child of the (invisible) system root node.
  		 * @returns {boolean}
  		 * @since 2.4
  		 */
  		isTopLevel: function() {
  			return this.tree.rootNode === this.parent;
  		},
  		/** Return true if node is lazy and not yet loaded. For non-lazy nodes always return false.
  		 * @returns {boolean}
  		 */
  		isUndefined: function() {
  			return this.hasChildren() === undefined; // also checks if the only child is a status node
  		},
  		/** Return true if all parent nodes are expanded. Note: this does not check
  		 * whether the node is scrolled into the visible part of the screen.
  		 * @returns {boolean}
  		 */
  		isVisible: function() {
  			var i,
  				l,
  				n,
  				hasFilter = this.tree.enableFilter,
  				parents = this.getParentList(false, false);
  
  			// TODO: check $(n.span).is(":visible")
  			// i.e. return false for nodes (but not parents) that are hidden
  			// by a filter
  			if (hasFilter && !this.match && !this.subMatchCount) {
  				// this.debug( "isVisible: HIDDEN (" + hasFilter + ", " + this.match + ", " + this.match + ")" );
  				return false;
  			}
  
  			for (i = 0, l = parents.length; i < l; i++) {
  				n = parents[i];
  
  				if (!n.expanded) {
  					// this.debug("isVisible: HIDDEN (parent collapsed)");
  					return false;
  				}
  				// if (hasFilter && !n.match && !n.subMatchCount) {
  				// 	this.debug("isVisible: HIDDEN (" + hasFilter + ", " + this.match + ", " + this.match + ")");
  				// 	return false;
  				// }
  			}
  			// this.debug("isVisible: VISIBLE");
  			return true;
  		},
  		/** Deprecated.
  		 * @deprecated since 2014-02-16: use load() instead.
  		 */
  		lazyLoad: function(discard) {
  			$.error(
  				"FancytreeNode.lazyLoad() is deprecated since 2014-02-16. Use .load() instead."
  			);
  		},
  		/**
  		 * Load all children of a lazy node if neccessary. The <i>expanded</i> state is maintained.
  		 * @param {boolean} [forceReload=false] Pass true to discard any existing nodes before. Otherwise this method does nothing if the node was already loaded.
  		 * @returns {$.Promise}
  		 */
  		load: function(forceReload) {
  			var res,
  				source,
  				self = this,
  				wasExpanded = this.isExpanded();
  
  			_assert(this.isLazy(), "load() requires a lazy node");
  			// _assert( forceReload || this.isUndefined(), "Pass forceReload=true to re-load a lazy node" );
  			if (!forceReload && !this.isUndefined()) {
  				return _getResolvedPromise(this);
  			}
  			if (this.isLoaded()) {
  				this.resetLazy(); // also collapses
  			}
  			// This method is also called by setExpanded() and loadKeyPath(), so we
  			// have to avoid recursion.
  			source = this.tree._triggerNodeEvent("lazyLoad", this);
  			if (source === false) {
  				// #69
  				return _getResolvedPromise(this);
  			}
  			_assert(
  				typeof source !== "boolean",
  				"lazyLoad event must return source in data.result"
  			);
  			res = this.tree._callHook("nodeLoadChildren", this, source);
  			if (wasExpanded) {
  				this.expanded = true;
  				res.always(function() {
  					self.render();
  				});
  			} else {
  				res.always(function() {
  					self.renderStatus(); // fix expander icon to 'loaded'
  				});
  			}
  			return res;
  		},
  		/** Expand all parents and optionally scroll into visible area as neccessary.
  		 * Promise is resolved, when lazy loading and animations are done.
  		 * @param {object} [opts] passed to `setExpanded()`.
  		 *     Defaults to {noAnimation: false, noEvents: false, scrollIntoView: true}
  		 * @returns {$.Promise}
  		 */
  		makeVisible: function(opts) {
  			var i,
  				self = this,
  				deferreds = [],
  				dfd = new $.Deferred(),
  				parents = this.getParentList(false, false),
  				len = parents.length,
  				effects = !(opts && opts.noAnimation === true),
  				scroll = !(opts && opts.scrollIntoView === false);
  
  			// Expand bottom-up, so only the top node is animated
  			for (i = len - 1; i >= 0; i--) {
  				// self.debug("pushexpand" + parents[i]);
  				deferreds.push(parents[i].setExpanded(true, opts));
  			}
  			$.when.apply($, deferreds).done(function() {
  				// All expands have finished
  				// self.debug("expand DONE", scroll);
  				if (scroll) {
  					self.scrollIntoView(effects).done(function() {
  						// self.debug("scroll DONE");
  						dfd.resolve();
  					});
  				} else {
  					dfd.resolve();
  				}
  			});
  			return dfd.promise();
  		},
  		/** Move this node to targetNode.
  		 *  @param {FancytreeNode} targetNode
  		 *  @param {string} mode <pre>
  		 *      'child': append this node as last child of targetNode.
  		 *               This is the default. To be compatble with the D'n'd
  		 *               hitMode, we also accept 'over'.
  		 *      'firstChild': add this node as first child of targetNode.
  		 *      'before': add this node as sibling before targetNode.
  		 *      'after': add this node as sibling after targetNode.</pre>
  		 *  @param {function} [map] optional callback(FancytreeNode) to allow modifcations
  		 */
  		moveTo: function(targetNode, mode, map) {
  			if (mode === undefined || mode === "over") {
  				mode = "child";
  			} else if (mode === "firstChild") {
  				if (targetNode.children && targetNode.children.length) {
  					mode = "before";
  					targetNode = targetNode.children[0];
  				} else {
  					mode = "child";
  				}
  			}
  			var pos,
  				tree = this.tree,
  				prevParent = this.parent,
  				targetParent =
  					mode === "child" ? targetNode : targetNode.parent;
  
  			if (this === targetNode) {
  				return;
  			} else if (!this.parent) {
  				$.error("Cannot move system root");
  			} else if (targetParent.isDescendantOf(this)) {
  				$.error("Cannot move a node to its own descendant");
  			}
  			if (targetParent !== prevParent) {
  				prevParent.triggerModifyChild("remove", this);
  			}
  			// Unlink this node from current parent
  			if (this.parent.children.length === 1) {
  				if (this.parent === targetParent) {
  					return; // #258
  				}
  				this.parent.children = this.parent.lazy ? [] : null;
  				this.parent.expanded = false;
  			} else {
  				pos = $.inArray(this, this.parent.children);
  				_assert(pos >= 0, "invalid source parent");
  				this.parent.children.splice(pos, 1);
  			}
  			// Remove from source DOM parent
  			// if(this.parent.ul){
  			// 	this.parent.ul.removeChild(this.li);
  			// }
  
  			// Insert this node to target parent's child list
  			this.parent = targetParent;
  			if (targetParent.hasChildren()) {
  				switch (mode) {
  					case "child":
  						// Append to existing target children
  						targetParent.children.push(this);
  						break;
  					case "before":
  						// Insert this node before target node
  						pos = $.inArray(targetNode, targetParent.children);
  						_assert(pos >= 0, "invalid target parent");
  						targetParent.children.splice(pos, 0, this);
  						break;
  					case "after":
  						// Insert this node after target node
  						pos = $.inArray(targetNode, targetParent.children);
  						_assert(pos >= 0, "invalid target parent");
  						targetParent.children.splice(pos + 1, 0, this);
  						break;
  					default:
  						$.error("Invalid mode " + mode);
  				}
  			} else {
  				targetParent.children = [this];
  			}
  			// Parent has no <ul> tag yet:
  			// if( !targetParent.ul ) {
  			// 	// This is the parent's first child: create UL tag
  			// 	// (Hidden, because it will be
  			// 	targetParent.ul = document.createElement("ul");
  			// 	targetParent.ul.style.display = "none";
  			// 	targetParent.li.appendChild(targetParent.ul);
  			// }
  			// // Issue 319: Add to target DOM parent (only if node was already rendered(expanded))
  			// if(this.li){
  			// 	targetParent.ul.appendChild(this.li);
  			// }
  
  			// Let caller modify the nodes
  			if (map) {
  				targetNode.visit(map, true);
  			}
  			if (targetParent === prevParent) {
  				targetParent.triggerModifyChild("move", this);
  			} else {
  				// prevParent.triggerModifyChild("remove", this);
  				targetParent.triggerModifyChild("add", this);
  			}
  			// Handle cross-tree moves
  			if (tree !== targetNode.tree) {
  				// Fix node.tree for all source nodes
  				// 	_assert(false, "Cross-tree move is not yet implemented.");
  				this.warn("Cross-tree moveTo is experimental!");
  				this.visit(function(n) {
  					// TODO: fix selection state and activation, ...
  					n.tree = targetNode.tree;
  				}, true);
  			}
  
  			// A collaposed node won't re-render children, so we have to remove it manually
  			// if( !targetParent.expanded ){
  			//   prevParent.ul.removeChild(this.li);
  			// }
  			tree._callHook("treeStructureChanged", tree, "moveTo");
  
  			// Update HTML markup
  			if (!prevParent.isDescendantOf(targetParent)) {
  				prevParent.render();
  			}
  			if (
  				!targetParent.isDescendantOf(prevParent) &&
  				targetParent !== prevParent
  			) {
  				targetParent.render();
  			}
  			// TODO: fix selection state
  			// TODO: fix active state
  
  			/*
  			var tree = this.tree;
  			var opts = tree.options;
  			var pers = tree.persistence;
  
  			// Always expand, if it's below minExpandLevel
  			// tree.logDebug ("%s._addChildNode(%o), l=%o", this, ftnode, ftnode.getLevel());
  			if ( opts.minExpandLevel >= ftnode.getLevel() ) {
  				// tree.logDebug ("Force expand for %o", ftnode);
  				this.bExpanded = true;
  			}
  
  			// In multi-hier mode, update the parents selection state
  			// DT issue #82: only if not initializing, because the children may not exist yet
  			// if( !ftnode.data.isStatusNode() && opts.selectMode==3 && !isInitializing )
  			// 	ftnode._fixSelectionState();
  
  			// In multi-hier mode, update the parents selection state
  			if( ftnode.bSelected && opts.selectMode==3 ) {
  				var p = this;
  				while( p ) {
  					if( !p.hasSubSel )
  						p._setSubSel(true);
  					p = p.parent;
  				}
  			}
  			// render this node and the new child
  			if ( tree.bEnableUpdate )
  				this.render();
  			return ftnode;
  			*/
  		},
  		/** Set focus relative to this node and optionally activate.
  		 *
  		 * 'left' collapses the node if it is expanded, or move to the parent
  		 * otherwise.
  		 * 'right' expands the node if it is collapsed, or move to the first
  		 * child otherwise.
  		 *
  		 * @param {string|number} where 'down', 'first', 'last', 'left', 'parent', 'right', or 'up'.
  		 *   (Alternatively the keyCode that would normally trigger this move,
  		 *   e.g. `$.ui.keyCode.LEFT` = 'left'.
  		 * @param {boolean} [activate=true]
  		 * @returns {$.Promise}
  		 */
  		navigate: function(where, activate) {
  			var node,
  				KC = $.ui.keyCode;
  
  			// Handle optional expand/collapse action for LEFT/RIGHT
  			switch (where) {
  				case "left":
  				case KC.LEFT:
  					if (this.expanded) {
  						return this.setExpanded(false);
  					}
  					break;
  				case "right":
  				case KC.RIGHT:
  					if (!this.expanded && (this.children || this.lazy)) {
  						return this.setExpanded();
  					}
  					break;
  			}
  			// Otherwise activate or focus the related node
  			node = this.findRelatedNode(where);
  			if (node) {
  				// setFocus/setActive will scroll later (if autoScroll is specified)
  				try {
  					node.makeVisible({ scrollIntoView: false });
  				} catch (e) {} // #272
  				if (activate === false) {
  					node.setFocus();
  					return _getResolvedPromise();
  				}
  				return node.setActive();
  			}
  			this.warn("Could not find related node '" + where + "'.");
  			return _getResolvedPromise();
  		},
  		/**
  		 * Remove this node (not allowed for system root).
  		 */
  		remove: function() {
  			return this.parent.removeChild(this);
  		},
  		/**
  		 * Remove childNode from list of direct children.
  		 * @param {FancytreeNode} childNode
  		 */
  		removeChild: function(childNode) {
  			return this.tree._callHook("nodeRemoveChild", this, childNode);
  		},
  		/**
  		 * Remove all child nodes and descendents. This converts the node into a leaf.<br>
  		 * If this was a lazy node, it is still considered 'loaded'; call node.resetLazy()
  		 * in order to trigger lazyLoad on next expand.
  		 */
  		removeChildren: function() {
  			return this.tree._callHook("nodeRemoveChildren", this);
  		},
  		/**
  		 * Remove class from node's span tag and .extraClasses.
  		 *
  		 * @param {string} className class name
  		 *
  		 * @since 2.17
  		 */
  		removeClass: function(className) {
  			return this.toggleClass(className, false);
  		},
  		/**
  		 * This method renders and updates all HTML markup that is required
  		 * to display this node in its current state.<br>
  		 * Note:
  		 * <ul>
  		 * <li>It should only be neccessary to call this method after the node object
  		 *     was modified by direct access to its properties, because the common
  		 *     API methods (node.setTitle(), moveTo(), addChildren(), remove(), ...)
  		 *     already handle this.
  		 * <li> {@link FancytreeNode#renderTitle} and {@link FancytreeNode#renderStatus}
  		 *     are implied. If changes are more local, calling only renderTitle() or
  		 *     renderStatus() may be sufficient and faster.
  		 * </ul>
  		 *
  		 * @param {boolean} [force=false] re-render, even if html markup was already created
  		 * @param {boolean} [deep=false] also render all descendants, even if parent is collapsed
  		 */
  		render: function(force, deep) {
  			return this.tree._callHook("nodeRender", this, force, deep);
  		},
  		/** Create HTML markup for the node's outer `<span>` (expander, checkbox, icon, and title).
  		 * Implies {@link FancytreeNode#renderStatus}.
  		 * @see Fancytree_Hooks#nodeRenderTitle
  		 */
  		renderTitle: function() {
  			return this.tree._callHook("nodeRenderTitle", this);
  		},
  		/** Update element's CSS classes according to node state.
  		 * @see Fancytree_Hooks#nodeRenderStatus
  		 */
  		renderStatus: function() {
  			return this.tree._callHook("nodeRenderStatus", this);
  		},
  		/**
  		 * (experimental) Replace this node with `source`.
  		 * (Currently only available for paging nodes.)
  		 * @param {NodeData[]} source List of child node definitions
  		 * @since 2.15
  		 */
  		replaceWith: function(source) {
  			var res,
  				parent = this.parent,
  				pos = $.inArray(this, parent.children),
  				self = this;
  
  			_assert(
  				this.isPagingNode(),
  				"replaceWith() currently requires a paging status node"
  			);
  
  			res = this.tree._callHook("nodeLoadChildren", this, source);
  			res.done(function(data) {
  				// New nodes are currently children of `this`.
  				var children = self.children;
  				// Prepend newly loaded child nodes to `this`
  				// Move new children after self
  				for (i = 0; i < children.length; i++) {
  					children[i].parent = parent;
  				}
  				parent.children.splice.apply(
  					parent.children,
  					[pos + 1, 0].concat(children)
  				);
  
  				// Remove self
  				self.children = null;
  				self.remove();
  				// Redraw new nodes
  				parent.render();
  				// TODO: set node.partload = false if this was tha last paging node?
  				// parent.addPagingNode(false);
  			}).fail(function() {
  				self.setExpanded();
  			});
  			return res;
  			// $.error("Not implemented: replaceWith()");
  		},
  		/**
  		 * Remove all children, collapse, and set the lazy-flag, so that the lazyLoad
  		 * event is triggered on next expand.
  		 */
  		resetLazy: function() {
  			this.removeChildren();
  			this.expanded = false;
  			this.lazy = true;
  			this.children = undefined;
  			this.renderStatus();
  		},
  		/** Schedule activity for delayed execution (cancel any pending request).
  		 *  scheduleAction('cancel') will only cancel a pending request (if any).
  		 * @param {string} mode
  		 * @param {number} ms
  		 */
  		scheduleAction: function(mode, ms) {
  			if (this.tree.timer) {
  				clearTimeout(this.tree.timer);
  				this.tree.debug("clearTimeout(%o)", this.tree.timer);
  			}
  			this.tree.timer = null;
  			var self = this; // required for closures
  			switch (mode) {
  				case "cancel":
  					// Simply made sure that timer was cleared
  					break;
  				case "expand":
  					this.tree.timer = setTimeout(function() {
  						self.tree.debug("setTimeout: trigger expand");
  						self.setExpanded(true);
  					}, ms);
  					break;
  				case "activate":
  					this.tree.timer = setTimeout(function() {
  						self.tree.debug("setTimeout: trigger activate");
  						self.setActive(true);
  					}, ms);
  					break;
  				default:
  					$.error("Invalid mode " + mode);
  			}
  			// this.tree.debug("setTimeout(%s, %s): %s", mode, ms, this.tree.timer);
  		},
  		/**
  		 *
  		 * @param {boolean | PlainObject} [effects=false] animation options.
  		 * @param {object} [options=null] {topNode: null, effects: ..., parent: ...} this node will remain visible in
  		 *     any case, even if `this` is outside the scroll pane.
  		 * @returns {$.Promise}
  		 */
  		scrollIntoView: function(effects, options) {
  			if (options !== undefined && _isNode(options)) {
  				throw Error(
  					"scrollIntoView() with 'topNode' option is deprecated since 2014-05-08. Use 'options.topNode' instead."
  				);
  			}
  			// The scroll parent is typically the plain tree's <UL> container.
  			// For ext-table, we choose the nearest parent that has `position: relative`
  			// and `overflow` set.
  			// (This default can be overridden by the local or global `scrollParent` option.)
  			var opts = $.extend(
  					{
  						effects:
  							effects === true
  								? { duration: 200, queue: false }
  								: effects,
  						scrollOfs: this.tree.options.scrollOfs,
  						scrollParent: this.tree.options.scrollParent,
  						topNode: null,
  					},
  					options
  				),
  				$scrollParent = opts.scrollParent,
  				$container = this.tree.$container,
  				overflowY = $container.css("overflow-y");
  
  			if (!$scrollParent) {
  				if (this.tree.tbody) {
  					$scrollParent = $container.scrollParent();
  				} else if (overflowY === "scroll" || overflowY === "auto") {
  					$scrollParent = $container;
  				} else {
  					// #922 plain tree in a non-fixed-sized UL scrolls inside its parent
  					$scrollParent = $container.scrollParent();
  				}
  			} else if (!$scrollParent.jquery) {
  				// Make sure we have a jQuery object
  				$scrollParent = $($scrollParent);
  			}
  			if (
  				$scrollParent[0] === document ||
  				$scrollParent[0] === document.body
  			) {
  				// `document` may be returned by $().scrollParent(), if nothing is found,
  				// but would not work: (see #894)
  				this.debug(
  					"scrollIntoView(): normalizing scrollParent to 'window':",
  					$scrollParent[0]
  				);
  				$scrollParent = $(window);
  			}
  			// eslint-disable-next-line one-var
  			var topNodeY,
  				nodeY,
  				horzScrollbarHeight,
  				containerOffsetTop,
  				dfd = new $.Deferred(),
  				self = this,
  				nodeHeight = $(this.span).height(),
  				topOfs = opts.scrollOfs.top || 0,
  				bottomOfs = opts.scrollOfs.bottom || 0,
  				containerHeight = $scrollParent.height(),
  				scrollTop = $scrollParent.scrollTop(),
  				$animateTarget = $scrollParent,
  				isParentWindow = $scrollParent[0] === window,
  				topNode = opts.topNode || null,
  				newScrollTop = null;
  
  			// this.debug("scrollIntoView(), scrollTop=" + scrollTop, opts.scrollOfs);
  			// _assert($(this.span).is(":visible"), "scrollIntoView node is invisible"); // otherwise we cannot calc offsets
  			if (this.isRootNode() || !this.isVisible()) {
  				// We cannot calc offsets for hidden elements
  				this.info("scrollIntoView(): node is invisible.");
  				return _getResolvedPromise();
  			}
  			if (isParentWindow) {
  				nodeY = $(this.span).offset().top;
  				topNodeY =
  					topNode && topNode.span ? $(topNode.span).offset().top : 0;
  				$animateTarget = $("html,body");
  			} else {
  				_assert(
  					$scrollParent[0] !== document &&
  						$scrollParent[0] !== document.body,
  					"scrollParent should be a simple element or `window`, not document or body."
  				);
  
  				containerOffsetTop = $scrollParent.offset().top;
  				nodeY =
  					$(this.span).offset().top - containerOffsetTop + scrollTop; // relative to scroll parent
  				topNodeY = topNode
  					? $(topNode.span).offset().top -
  					  containerOffsetTop +
  					  scrollTop
  					: 0;
  				horzScrollbarHeight = Math.max(
  					0,
  					$scrollParent.innerHeight() - $scrollParent[0].clientHeight
  				);
  				containerHeight -= horzScrollbarHeight;
  			}
  
  			// this.debug("    scrollIntoView(), nodeY=" + nodeY + ", containerHeight=" + containerHeight);
  			if (nodeY < scrollTop + topOfs) {
  				// Node is above visible container area
  				newScrollTop = nodeY - topOfs;
  				// this.debug("    scrollIntoView(), UPPER newScrollTop=" + newScrollTop);
  			} else if (
  				nodeY + nodeHeight >
  				scrollTop + containerHeight - bottomOfs
  			) {
  				newScrollTop = nodeY + nodeHeight - containerHeight + bottomOfs;
  				// this.debug("    scrollIntoView(), LOWER newScrollTop=" + newScrollTop);
  				// If a topNode was passed, make sure that it is never scrolled
  				// outside the upper border
  				if (topNode) {
  					_assert(
  						topNode.isRootNode() || topNode.isVisible(),
  						"topNode must be visible"
  					);
  					if (topNodeY < newScrollTop) {
  						newScrollTop = topNodeY - topOfs;
  						// this.debug("    scrollIntoView(), TOP newScrollTop=" + newScrollTop);
  					}
  				}
  			}
  
  			if (newScrollTop === null) {
  				dfd.resolveWith(this);
  			} else {
  				// this.debug("    scrollIntoView(), SET newScrollTop=" + newScrollTop);
  				if (opts.effects) {
  					opts.effects.complete = function() {
  						dfd.resolveWith(self);
  					};
  					$animateTarget.stop(true).animate(
  						{
  							scrollTop: newScrollTop,
  						},
  						opts.effects
  					);
  				} else {
  					$animateTarget[0].scrollTop = newScrollTop;
  					dfd.resolveWith(this);
  				}
  			}
  			return dfd.promise();
  		},
  
  		/**Activate this node.
  		 *
  		 * The `cell` option requires the ext-table and ext-ariagrid extensions.
  		 *
  		 * @param {boolean} [flag=true] pass false to deactivate
  		 * @param {object} [opts] additional options. Defaults to {noEvents: false, noFocus: false, cell: null}
  		 * @returns {$.Promise}
  		 */
  		setActive: function(flag, opts) {
  			return this.tree._callHook("nodeSetActive", this, flag, opts);
  		},
  		/**Expand or collapse this node. Promise is resolved, when lazy loading and animations are done.
  		 * @param {boolean} [flag=true] pass false to collapse
  		 * @param {object} [opts] additional options. Defaults to {noAnimation: false, noEvents: false}
  		 * @returns {$.Promise}
  		 */
  		setExpanded: function(flag, opts) {
  			return this.tree._callHook("nodeSetExpanded", this, flag, opts);
  		},
  		/**Set keyboard focus to this node.
  		 * @param {boolean} [flag=true] pass false to blur
  		 * @see Fancytree#setFocus
  		 */
  		setFocus: function(flag) {
  			return this.tree._callHook("nodeSetFocus", this, flag);
  		},
  		/**Select this node, i.e. check the checkbox.
  		 * @param {boolean} [flag=true] pass false to deselect
  		 * @param {object} [opts] additional options. Defaults to {noEvents: false, p
  		 *     propagateDown: null, propagateUp: null, callback: null }
  		 */
  		setSelected: function(flag, opts) {
  			return this.tree._callHook("nodeSetSelected", this, flag, opts);
  		},
  		/**Mark a lazy node as 'error', 'loading', 'nodata', or 'ok'.
  		 * @param {string} status 'error'|'loading'|'nodata'|'ok'
  		 * @param {string} [message]
  		 * @param {string} [details]
  		 */
  		setStatus: function(status, message, details) {
  			return this.tree._callHook(
  				"nodeSetStatus",
  				this,
  				status,
  				message,
  				details
  			);
  		},
  		/**Rename this node.
  		 * @param {string} title
  		 */
  		setTitle: function(title) {
  			this.title = title;
  			this.renderTitle();
  			this.triggerModify("rename");
  		},
  		/**Sort child list by title.
  		 * @param {function} [cmp] custom compare function(a, b) that returns -1, 0, or 1 (defaults to sort by title).
  		 * @param {boolean} [deep=false] pass true to sort all descendant nodes
  		 */
  		sortChildren: function(cmp, deep) {
  			var i,
  				l,
  				cl = this.children;
  
  			if (!cl) {
  				return;
  			}
  			cmp =
  				cmp ||
  				function(a, b) {
  					var x = a.title.toLowerCase(),
  						y = b.title.toLowerCase();
  
  					// eslint-disable-next-line no-nested-ternary
  					return x === y ? 0 : x > y ? 1 : -1;
  				};
  			cl.sort(cmp);
  			if (deep) {
  				for (i = 0, l = cl.length; i < l; i++) {
  					if (cl[i].children) {
  						cl[i].sortChildren(cmp, "$norender$");
  					}
  				}
  			}
  			if (deep !== "$norender$") {
  				this.render();
  			}
  			this.triggerModifyChild("sort");
  		},
  		/** Convert node (or whole branch) into a plain object.
  		 *
  		 * The result is compatible with node.addChildren().
  		 *
  		 * @param {boolean} [recursive=false] include child nodes
  		 * @param {function} [callback] callback(dict, node) is called for every node, in order to allow modifications.
  		 *     Return `false` to ignore this node or `"skip"` to include this node without its children.
  		 * @returns {NodeData}
  		 */
  		toDict: function(recursive, callback) {
  			var i,
  				l,
  				node,
  				res,
  				dict = {},
  				self = this;
  
  			$.each(NODE_ATTRS, function(i, a) {
  				if (self[a] || self[a] === false) {
  					dict[a] = self[a];
  				}
  			});
  			if (!$.isEmptyObject(this.data)) {
  				dict.data = $.extend({}, this.data);
  				if ($.isEmptyObject(dict.data)) {
  					delete dict.data;
  				}
  			}
  			if (callback) {
  				res = callback(dict, self);
  				if (res === false) {
  					return false; // Don't include this node nor its children
  				}
  				if (res === "skip") {
  					recursive = false; // Include this node, but not the children
  				}
  			}
  			if (recursive) {
  				if ($.isArray(this.children)) {
  					dict.children = [];
  					for (i = 0, l = this.children.length; i < l; i++) {
  						node = this.children[i];
  						if (!node.isStatusNode()) {
  							res = node.toDict(true, callback);
  							if (res !== false) {
  								dict.children.push(res);
  							}
  						}
  					}
  				}
  			}
  			return dict;
  		},
  		/**
  		 * Set, clear, or toggle class of node's span tag and .extraClasses.
  		 *
  		 * @param {string} className class name (separate multiple classes by space)
  		 * @param {boolean} [flag] true/false to add/remove class. If omitted, class is toggled.
  		 * @returns {boolean} true if a class was added
  		 *
  		 * @since 2.17
  		 */
  		toggleClass: function(value, flag) {
  			var className,
  				hasClass,
  				rnotwhite = /\S+/g,
  				classNames = value.match(rnotwhite) || [],
  				i = 0,
  				wasAdded = false,
  				statusElem = this[this.tree.statusClassPropName],
  				curClasses = " " + (this.extraClasses || "") + " ";
  
  			// this.info("toggleClass('" + value + "', " + flag + ")", curClasses);
  			// Modify DOM element directly if it already exists
  			if (statusElem) {
  				$(statusElem).toggleClass(value, flag);
  			}
  			// Modify node.extraClasses to make this change persistent
  			// Toggle if flag was not passed
  			while ((className = classNames[i++])) {
  				hasClass = curClasses.indexOf(" " + className + " ") >= 0;
  				flag = flag === undefined ? !hasClass : !!flag;
  				if (flag) {
  					if (!hasClass) {
  						curClasses += className + " ";
  						wasAdded = true;
  					}
  				} else {
  					while (curClasses.indexOf(" " + className + " ") > -1) {
  						curClasses = curClasses.replace(
  							" " + className + " ",
  							" "
  						);
  					}
  				}
  			}
  			this.extraClasses = $.trim(curClasses);
  			// this.info("-> toggleClass('" + value + "', " + flag + "): '" + this.extraClasses + "'");
  			return wasAdded;
  		},
  		/** Flip expanded status. */
  		toggleExpanded: function() {
  			return this.tree._callHook("nodeToggleExpanded", this);
  		},
  		/** Flip selection status. */
  		toggleSelected: function() {
  			return this.tree._callHook("nodeToggleSelected", this);
  		},
  		toString: function() {
  			return "FancytreeNode@" + this.key + "[title='" + this.title + "']";
  			// return "<FancytreeNode(#" + this.key + ", '" + this.title + "')>";
  		},
  		/**
  		 * Trigger `modifyChild` event on a parent to signal that a child was modified.
  		 * @param {string} operation Type of change: 'add', 'remove', 'rename', 'move', 'data', ...
  		 * @param {FancytreeNode} [childNode]
  		 * @param {object} [extra]
  		 */
  		triggerModifyChild: function(operation, childNode, extra) {
  			var data,
  				modifyChild = this.tree.options.modifyChild;
  
  			if (modifyChild) {
  				if (childNode && childNode.parent !== this) {
  					$.error(
  						"childNode " + childNode + " is not a child of " + this
  					);
  				}
  				data = {
  					node: this,
  					tree: this.tree,
  					operation: operation,
  					childNode: childNode || null,
  				};
  				if (extra) {
  					$.extend(data, extra);
  				}
  				modifyChild({ type: "modifyChild" }, data);
  			}
  		},
  		/**
  		 * Trigger `modifyChild` event on node.parent(!).
  		 * @param {string} operation Type of change: 'add', 'remove', 'rename', 'move', 'data', ...
  		 * @param {object} [extra]
  		 */
  		triggerModify: function(operation, extra) {
  			this.parent.triggerModifyChild(operation, this, extra);
  		},
  		/** Call fn(node) for all child nodes in hierarchical order (depth-first).<br>
  		 * Stop iteration, if fn() returns false. Skip current branch, if fn() returns "skip".<br>
  		 * Return false if iteration was stopped.
  		 *
  		 * @param {function} fn the callback function.
  		 *     Return false to stop iteration, return "skip" to skip this node and
  		 *     its children only.
  		 * @param {boolean} [includeSelf=false]
  		 * @returns {boolean}
  		 */
  		visit: function(fn, includeSelf) {
  			var i,
  				l,
  				res = true,
  				children = this.children;
  
  			if (includeSelf === true) {
  				res = fn(this);
  				if (res === false || res === "skip") {
  					return res;
  				}
  			}
  			if (children) {
  				for (i = 0, l = children.length; i < l; i++) {
  					res = children[i].visit(fn, true);
  					if (res === false) {
  						break;
  					}
  				}
  			}
  			return res;
  		},
  		/** Call fn(node) for all child nodes and recursively load lazy children.<br>
  		 * <b>Note:</b> If you need this method, you probably should consider to review
  		 * your architecture! Recursivley loading nodes is a perfect way for lazy
  		 * programmers to flood the server with requests ;-)
  		 *
  		 * @param {function} [fn] optional callback function.
  		 *     Return false to stop iteration, return "skip" to skip this node and
  		 *     its children only.
  		 * @param {boolean} [includeSelf=false]
  		 * @returns {$.Promise}
  		 * @since 2.4
  		 */
  		visitAndLoad: function(fn, includeSelf, _recursion) {
  			var dfd,
  				res,
  				loaders,
  				node = this;
  
  			// node.debug("visitAndLoad");
  			if (fn && includeSelf === true) {
  				res = fn(node);
  				if (res === false || res === "skip") {
  					return _recursion ? res : _getResolvedPromise();
  				}
  			}
  			if (!node.children && !node.lazy) {
  				return _getResolvedPromise();
  			}
  			dfd = new $.Deferred();
  			loaders = [];
  			// node.debug("load()...");
  			node.load().done(function() {
  				// node.debug("load()... done.");
  				for (var i = 0, l = node.children.length; i < l; i++) {
  					res = node.children[i].visitAndLoad(fn, true, true);
  					if (res === false) {
  						dfd.reject();
  						break;
  					} else if (res !== "skip") {
  						loaders.push(res); // Add promise to the list
  					}
  				}
  				$.when.apply(this, loaders).then(function() {
  					dfd.resolve();
  				});
  			});
  			return dfd.promise();
  		},
  		/** Call fn(node) for all parent nodes, bottom-up, including invisible system root.<br>
  		 * Stop iteration, if fn() returns false.<br>
  		 * Return false if iteration was stopped.
  		 *
  		 * @param {function} fn the callback function.
  		 *     Return false to stop iteration, return "skip" to skip this node and children only.
  		 * @param {boolean} [includeSelf=false]
  		 * @returns {boolean}
  		 */
  		visitParents: function(fn, includeSelf) {
  			// Visit parent nodes (bottom up)
  			if (includeSelf && fn(this) === false) {
  				return false;
  			}
  			var p = this.parent;
  			while (p) {
  				if (fn(p) === false) {
  					return false;
  				}
  				p = p.parent;
  			}
  			return true;
  		},
  		/** Call fn(node) for all sibling nodes.<br>
  		 * Stop iteration, if fn() returns false.<br>
  		 * Return false if iteration was stopped.
  		 *
  		 * @param {function} fn the callback function.
  		 *     Return false to stop iteration.
  		 * @param {boolean} [includeSelf=false]
  		 * @returns {boolean}
  		 */
  		visitSiblings: function(fn, includeSelf) {
  			var i,
  				l,
  				n,
  				ac = this.parent.children;
  
  			for (i = 0, l = ac.length; i < l; i++) {
  				n = ac[i];
  				if (includeSelf || n !== this) {
  					if (fn(n) === false) {
  						return false;
  					}
  				}
  			}
  			return true;
  		},
  		/** Write warning to browser console if debugLevel >= 2 (prepending node info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		warn: function(msg) {
  			if (this.tree.options.debugLevel >= 2) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("warn", arguments);
  			}
  		},
  	};
  
  	/******************************************************************************
  	 * Fancytree
  	 */
  	/**
  	 * Construct a new tree object.
  	 *
  	 * @class Fancytree
  	 * @classdesc The controller behind a fancytree.
  	 * This class also contains 'hook methods': see {@link Fancytree_Hooks}.
  	 *
  	 * @param {Widget} widget
  	 *
  	 * @property {string} _id Automatically generated unique tree instance ID, e.g. "1".
  	 * @property {string} _ns Automatically generated unique tree namespace, e.g. ".fancytree-1".
  	 * @property {FancytreeNode} activeNode Currently active node or null.
  	 * @property {string} ariaPropName Property name of FancytreeNode that contains the element which will receive the aria attributes.
  	 *     Typically "li", but "tr" for table extension.
  	 * @property {jQueryObject} $container Outer `<ul>` element (or `<table>` element for ext-table).
  	 * @property {jQueryObject} $div A jQuery object containing the element used to instantiate the tree widget (`widget.element`)
  	 * @property {object|array} columns Recommended place to store shared column meta data. @since 2.27
  	 * @property {object} data Metadata, i.e. properties that may be passed to `source` in addition to a children array.
  	 * @property {object} ext Hash of all active plugin instances.
  	 * @property {FancytreeNode} focusNode Currently focused node or null.
  	 * @property {FancytreeNode} lastSelectedNode Used to implement selectMode 1 (single select)
  	 * @property {string} nodeContainerAttrName Property name of FancytreeNode that contains the outer element of single nodes.
  	 *     Typically "li", but "tr" for table extension.
  	 * @property {FancytreeOptions} options Current options, i.e. default options + options passed to constructor.
  	 * @property {FancytreeNode} rootNode Invisible system root node.
  	 * @property {string} statusClassPropName Property name of FancytreeNode that contains the element which will receive the status classes.
  	 *     Typically "span", but "tr" for table extension.
  	 * @property {object} types Map for shared type specific meta data, used with node.type attribute. @since 2.27
  	 * @property {object} viewport See ext-vieport. @since v2.31
  	 * @property {object} widget Base widget instance.
  	 */
  	function Fancytree(widget) {
  		this.widget = widget;
  		this.$div = widget.element;
  		this.options = widget.options;
  		if (this.options) {
  			if (this.options.lazyload !== undefined) {
  				$.error(
  					"The 'lazyload' event is deprecated since 2014-02-25. Use 'lazyLoad' (with uppercase L) instead."
  				);
  			}
  			if (this.options.loaderror !== undefined) {
  				$.error(
  					"The 'loaderror' event was renamed since 2014-07-03. Use 'loadError' (with uppercase E) instead."
  				);
  			}
  			if (this.options.fx !== undefined) {
  				$.error(
  					"The 'fx' option was replaced by 'toggleEffect' since 2014-11-30."
  				);
  			}
  			if (this.options.removeNode !== undefined) {
  				$.error(
  					"The 'removeNode' event was replaced by 'modifyChild' since 2.20 (2016-09-10)."
  				);
  			}
  		}
  		this.ext = {}; // Active extension instances
  		this.types = {};
  		this.columns = {};
  		// allow to init tree.data.foo from <div data-foo=''>
  		this.data = _getElementDataAsDict(this.$div);
  		// TODO: use widget.uuid instead?
  		this._id = "" + (this.options.treeId || $.ui.fancytree._nextId++);
  		// TODO: use widget.eventNamespace instead?
  		this._ns = ".fancytree-" + this._id; // append for namespaced events
  		this.activeNode = null;
  		this.focusNode = null;
  		this._hasFocus = null;
  		this._tempCache = {};
  		this._lastMousedownNode = null;
  		this._enableUpdate = true;
  		this.lastSelectedNode = null;
  		this.systemFocusElement = null;
  		this.lastQuicksearchTerm = "";
  		this.lastQuicksearchTime = 0;
  		this.viewport = null; // ext-grid
  
  		this.statusClassPropName = "span";
  		this.ariaPropName = "li";
  		this.nodeContainerAttrName = "li";
  
  		// Remove previous markup if any
  		this.$div.find(">ul.fancytree-container").remove();
  
  		// Create a node without parent.
  		var fakeParent = { tree: this },
  			$ul;
  		this.rootNode = new FancytreeNode(fakeParent, {
  			title: "root",
  			key: "root_" + this._id,
  			children: null,
  			expanded: true,
  		});
  		this.rootNode.parent = null;
  
  		// Create root markup
  		$ul = $("<ul>", {
  			id: "ft-id-" + this._id,
  			class: "ui-fancytree fancytree-container fancytree-plain",
  		}).appendTo(this.$div);
  		this.$container = $ul;
  		this.rootNode.ul = $ul[0];
  
  		if (this.options.debugLevel == null) {
  			this.options.debugLevel = FT.debugLevel;
  		}
  		// // Add container to the TAB chain
  		// // See http://www.w3.org/TR/wai-aria-practices/#focus_activedescendant
  		// // #577: Allow to set tabindex to "0", "-1" and ""
  		// this.$container.attr("tabindex", this.options.tabindex);
  
  		// if( this.options.rtl ) {
  		// 	this.$container.attr("DIR", "RTL").addClass("fancytree-rtl");
  		// // }else{
  		// //	this.$container.attr("DIR", null).removeClass("fancytree-rtl");
  		// }
  		// if(this.options.aria){
  		// 	this.$container.attr("role", "tree");
  		// 	if( this.options.selectMode !== 1 ) {
  		// 		this.$container.attr("aria-multiselectable", true);
  		// 	}
  		// }
  	}
  
  	Fancytree.prototype = /** @lends Fancytree# */ {
  		/* Return a context object that can be re-used for _callHook().
  		 * @param {Fancytree | FancytreeNode | EventData} obj
  		 * @param {Event} originalEvent
  		 * @param {Object} extra
  		 * @returns {EventData}
  		 */
  		_makeHookContext: function(obj, originalEvent, extra) {
  			var ctx, tree;
  			if (obj.node !== undefined) {
  				// obj is already a context object
  				if (originalEvent && obj.originalEvent !== originalEvent) {
  					$.error("invalid args");
  				}
  				ctx = obj;
  			} else if (obj.tree) {
  				// obj is a FancytreeNode
  				tree = obj.tree;
  				ctx = {
  					node: obj,
  					tree: tree,
  					widget: tree.widget,
  					options: tree.widget.options,
  					originalEvent: originalEvent,
  					typeInfo: tree.types[obj.type] || {},
  				};
  			} else if (obj.widget) {
  				// obj is a Fancytree
  				ctx = {
  					node: null,
  					tree: obj,
  					widget: obj.widget,
  					options: obj.widget.options,
  					originalEvent: originalEvent,
  				};
  			} else {
  				$.error("invalid args");
  			}
  			if (extra) {
  				$.extend(ctx, extra);
  			}
  			return ctx;
  		},
  		/* Trigger a hook function: funcName(ctx, [...]).
  		 *
  		 * @param {string} funcName
  		 * @param {Fancytree|FancytreeNode|EventData} contextObject
  		 * @param {any}  [_extraArgs] optional additional arguments
  		 * @returns {any}
  		 */
  		_callHook: function(funcName, contextObject, _extraArgs) {
  			var ctx = this._makeHookContext(contextObject),
  				fn = this[funcName],
  				args = Array.prototype.slice.call(arguments, 2);
  			if (!$.isFunction(fn)) {
  				$.error("_callHook('" + funcName + "') is not a function");
  			}
  			args.unshift(ctx);
  			// this.debug("_hook", funcName, ctx.node && ctx.node.toString() || ctx.tree.toString(), args);
  			return fn.apply(this, args);
  		},
  		_setExpiringValue: function(key, value, ms) {
  			this._tempCache[key] = {
  				value: value,
  				expire: Date.now() + (+ms || 50),
  			};
  		},
  		_getExpiringValue: function(key) {
  			var entry = this._tempCache[key];
  			if (entry && entry.expire > Date.now()) {
  				return entry.value;
  			}
  			delete this._tempCache[key];
  			return null;
  		},
  		/* Check if this tree has extension `name` enabled.
  		 *
  		 * @param {string} name name of the required extension
  		 */
  		_usesExtension: function(name) {
  			return $.inArray(name, this.options.extensions) >= 0;
  		},
  		/* Check if current extensions dependencies are met and throw an error if not.
  		 *
  		 * This method may be called inside the `treeInit` hook for custom extensions.
  		 *
  		 * @param {string} name name of the required extension
  		 * @param {boolean} [required=true] pass `false` if the extension is optional, but we want to check for order if it is present
  		 * @param {boolean} [before] `true` if `name` must be included before this, `false` otherwise (use `null` if order doesn't matter)
  		 * @param {string} [message] optional error message (defaults to a descriptve error message)
  		 */
  		_requireExtension: function(name, required, before, message) {
  			if (before != null) {
  				before = !!before;
  			}
  			var thisName = this._local.name,
  				extList = this.options.extensions,
  				isBefore =
  					$.inArray(name, extList) < $.inArray(thisName, extList),
  				isMissing = required && this.ext[name] == null,
  				badOrder = !isMissing && before != null && before !== isBefore;
  
  			_assert(
  				thisName && thisName !== name,
  				"invalid or same name '" + thisName + "' (require yourself?)"
  			);
  
  			if (isMissing || badOrder) {
  				if (!message) {
  					if (isMissing || required) {
  						message =
  							"'" +
  							thisName +
  							"' extension requires '" +
  							name +
  							"'";
  						if (badOrder) {
  							message +=
  								" to be registered " +
  								(before ? "before" : "after") +
  								" itself";
  						}
  					} else {
  						message =
  							"If used together, `" +
  							name +
  							"` must be registered " +
  							(before ? "before" : "after") +
  							" `" +
  							thisName +
  							"`";
  					}
  				}
  				$.error(message);
  				return false;
  			}
  			return true;
  		},
  		/** Activate node with a given key and fire focus and activate events.
  		 *
  		 * A previously activated node will be deactivated.
  		 * If activeVisible option is set, all parents will be expanded as necessary.
  		 * Pass key = false, to deactivate the current node only.
  		 * @param {string} key
  		 * @param {object} [opts] additional options. Defaults to {noEvents: false, noFocus: false}
  		 * @returns {FancytreeNode} activated node (null, if not found)
  		 */
  		activateKey: function(key, opts) {
  			var node = this.getNodeByKey(key);
  			if (node) {
  				node.setActive(true, opts);
  			} else if (this.activeNode) {
  				this.activeNode.setActive(false, opts);
  			}
  			return node;
  		},
  		/** (experimental) Add child status nodes that indicate 'More...', ....
  		 * @param {boolean|object} node optional node definition. Pass `false` to remove all paging nodes.
  		 * @param {string} [mode='append'] 'child'|firstChild'
  		 * @since 2.15
  		 */
  		addPagingNode: function(node, mode) {
  			return this.rootNode.addPagingNode(node, mode);
  		},
  		/**
  		 * (experimental) Apply a modification (or navigation) operation.
  		 *
  		 * Valid commands:
  		 *   - 'moveUp', 'moveDown'
  		 *   - 'indent', 'outdent'
  		 *   - 'remove'
  		 *   - 'edit', 'addChild', 'addSibling': (reqires ext-edit extension)
  		 *   - 'cut', 'copy', 'paste': (use an internal singleton 'clipboard')
  		 *   - 'down', 'first', 'last', 'left', 'parent', 'right', 'up': navigate
  		 *
  		 * @param {string} cmd
  		 * @param {FancytreeNode} [node=active_node]
  		 * @param {object} [opts] Currently unused
  		 *
  		 * @since 2.32
  		 */
  		applyCommand: function(cmd, node, opts_) {
  			var // clipboard,
  				refNode;
  			// opts = $.extend(
  			// 	{ setActive: true, clipboard: CLIPBOARD },
  			// 	opts_
  			// );
  
  			node = node || this.getActiveNode();
  			// clipboard = opts.clipboard;
  
  			switch (cmd) {
  				// Sorting and indentation:
  				case "moveUp":
  					refNode = node.getPrevSibling();
  					if (refNode) {
  						node.moveTo(refNode, "before");
  						node.setActive();
  					}
  					break;
  				case "moveDown":
  					refNode = node.getNextSibling();
  					if (refNode) {
  						node.moveTo(refNode, "after");
  						node.setActive();
  					}
  					break;
  				case "indent":
  					refNode = node.getPrevSibling();
  					if (refNode) {
  						node.moveTo(refNode, "child");
  						refNode.setExpanded();
  						node.setActive();
  					}
  					break;
  				case "outdent":
  					if (!node.isTopLevel()) {
  						node.moveTo(node.getParent(), "after");
  						node.setActive();
  					}
  					break;
  				// Remove:
  				case "remove":
  					refNode = node.getPrevSibling() || node.getParent();
  					node.remove();
  					if (refNode) {
  						refNode.setActive();
  					}
  					break;
  				// Add, edit (requires ext-edit):
  				case "addChild":
  					node.editCreateNode("child", "");
  					break;
  				case "addSibling":
  					node.editCreateNode("after", "");
  					break;
  				case "rename":
  					node.editStart();
  					break;
  				// Simple clipboard simulation:
  				// case "cut":
  				// 	clipboard = { mode: cmd, data: node };
  				// 	break;
  				// case "copy":
  				// 	clipboard = {
  				// 		mode: cmd,
  				// 		data: node.toDict(function(d, n) {
  				// 			delete d.key;
  				// 		}),
  				// 	};
  				// 	break;
  				// case "clear":
  				// 	clipboard = null;
  				// 	break;
  				// case "paste":
  				// 	if (clipboard.mode === "cut") {
  				// 		// refNode = node.getPrevSibling();
  				// 		clipboard.data.moveTo(node, "child");
  				// 		clipboard.data.setActive();
  				// 	} else if (clipboard.mode === "copy") {
  				// 		node.addChildren(clipboard.data).setActive();
  				// 	}
  				// 	break;
  				// Navigation commands:
  				case "down":
  				case "first":
  				case "last":
  				case "left":
  				case "parent":
  				case "right":
  				case "up":
  					return node.navigate(cmd);
  				default:
  					$.error("Unhandled command: '" + cmd + "'");
  			}
  		},
  		/** (experimental) Modify existing data model.
  		 *
  		 * @param {Array} patchList array of [key, NodePatch] arrays
  		 * @returns {$.Promise} resolved, when all patches have been applied
  		 * @see TreePatch
  		 */
  		applyPatch: function(patchList) {
  			var dfd,
  				i,
  				p2,
  				key,
  				patch,
  				node,
  				patchCount = patchList.length,
  				deferredList = [];
  
  			for (i = 0; i < patchCount; i++) {
  				p2 = patchList[i];
  				_assert(
  					p2.length === 2,
  					"patchList must be an array of length-2-arrays"
  				);
  				key = p2[0];
  				patch = p2[1];
  				node = key === null ? this.rootNode : this.getNodeByKey(key);
  				if (node) {
  					dfd = new $.Deferred();
  					deferredList.push(dfd);
  					node.applyPatch(patch).always(_makeResolveFunc(dfd, node));
  				} else {
  					this.warn("could not find node with key '" + key + "'");
  				}
  			}
  			// Return a promise that is resolved, when ALL patches were applied
  			return $.when.apply($, deferredList).promise();
  		},
  		/* TODO: implement in dnd extension
  		cancelDrag: function() {
  				var dd = $.ui.ddmanager.current;
  				if(dd){
  					dd.cancel();
  				}
  			},
  		*/
  		/** Remove all nodes.
  		 * @since 2.14
  		 */
  		clear: function(source) {
  			this._callHook("treeClear", this);
  		},
  		/** Return the number of nodes.
  		 * @returns {integer}
  		 */
  		count: function() {
  			return this.rootNode.countChildren();
  		},
  		/** Write to browser console if debugLevel >= 4 (prepending tree name)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		debug: function(msg) {
  			if (this.options.debugLevel >= 4) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("log", arguments);
  			}
  		},
  		/** Destroy this widget, restore previous markup and cleanup resources.
  		 *
  		 * @since 2.34
  		 */
  		destroy: function() {
  			this.widget.destroy();
  		},
  		/** Enable (or disable) the tree control.
  		 *
  		 * @param {boolean} [flag=true] pass false to disable
  		 * @since 2.30
  		 */
  		enable: function(flag) {
  			if (flag === false) {
  				this.widget.disable();
  			} else {
  				this.widget.enable();
  			}
  		},
  		/** Temporarily suppress rendering to improve performance on bulk-updates.
  		 *
  		 * @param {boolean} flag
  		 * @returns {boolean} previous status
  		 * @since 2.19
  		 */
  		enableUpdate: function(flag) {
  			flag = flag !== false;
  			if (!!this._enableUpdate === !!flag) {
  				return flag;
  			}
  			this._enableUpdate = flag;
  			if (flag) {
  				this.debug("enableUpdate(true): redraw "); //, this._dirtyRoots);
  				this._callHook("treeStructureChanged", this, "enableUpdate");
  				this.render();
  			} else {
  				// 	this._dirtyRoots = null;
  				this.debug("enableUpdate(false)...");
  			}
  			return !flag; // return previous value
  		},
  		/** Write error to browser console if debugLevel >= 1 (prepending tree info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		error: function(msg) {
  			if (this.options.debugLevel >= 1) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("error", arguments);
  			}
  		},
  		/** Expand (or collapse) all parent nodes.
  		 *
  		 * This convenience method uses `tree.visit()` and `tree.setExpanded()`
  		 * internally.
  		 *
  		 * @param {boolean} [flag=true] pass false to collapse
  		 * @param {object} [opts] passed to setExpanded()
  		 * @since 2.30
  		 */
  		expandAll: function(flag, opts) {
  			var prev = this.enableUpdate(false);
  
  			flag = flag !== false;
  			this.visit(function(node) {
  				if (
  					node.hasChildren() !== false &&
  					node.isExpanded() !== flag
  				) {
  					node.setExpanded(flag, opts);
  				}
  			});
  			this.enableUpdate(prev);
  		},
  		/**Find all nodes that matches condition.
  		 *
  		 * @param {string | function(node)} match title string to search for, or a
  		 *     callback function that returns `true` if a node is matched.
  		 * @returns {FancytreeNode[]} array of nodes (may be empty)
  		 * @see FancytreeNode#findAll
  		 * @since 2.12
  		 */
  		findAll: function(match) {
  			return this.rootNode.findAll(match);
  		},
  		/**Find first node that matches condition.
  		 *
  		 * @param {string | function(node)} match title string to search for, or a
  		 *     callback function that returns `true` if a node is matched.
  		 * @returns {FancytreeNode} matching node or null
  		 * @see FancytreeNode#findFirst
  		 * @since 2.12
  		 */
  		findFirst: function(match) {
  			return this.rootNode.findFirst(match);
  		},
  		/** Find the next visible node that starts with `match`, starting at `startNode`
  		 * and wrap-around at the end.
  		 *
  		 * @param {string|function} match
  		 * @param {FancytreeNode} [startNode] defaults to first node
  		 * @returns {FancytreeNode} matching node or null
  		 */
  		findNextNode: function(match, startNode) {
  			//, visibleOnly) {
  			var res = null,
  				firstNode = this.getFirstChild();
  
  			match =
  				typeof match === "string"
  					? _makeNodeTitleStartMatcher(match)
  					: match;
  			startNode = startNode || firstNode;
  
  			function _checkNode(n) {
  				// console.log("_check " + n)
  				if (match(n)) {
  					res = n;
  				}
  				if (res || n === startNode) {
  					return false;
  				}
  			}
  			this.visitRows(_checkNode, {
  				start: startNode,
  				includeSelf: false,
  			});
  			// Wrap around search
  			if (!res && startNode !== firstNode) {
  				this.visitRows(_checkNode, {
  					start: firstNode,
  					includeSelf: true,
  				});
  			}
  			return res;
  		},
  		/** Find a node relative to another node.
  		 *
  		 * @param {FancytreeNode} node
  		 * @param {string|number} where 'down', 'first', 'last', 'left', 'parent', 'right', or 'up'.
  		 *   (Alternatively the keyCode that would normally trigger this move,
  		 *   e.g. `$.ui.keyCode.LEFT` = 'left'.
  		 * @param {boolean} [includeHidden=false] Not yet implemented
  		 * @returns {FancytreeNode|null}
  		 * @since v2.31
  		 */
  		findRelatedNode: function(node, where, includeHidden) {
  			var res = null,
  				KC = $.ui.keyCode;
  
  			switch (where) {
  				case "parent":
  				case KC.BACKSPACE:
  					if (node.parent && node.parent.parent) {
  						res = node.parent;
  					}
  					break;
  				case "first":
  				case KC.HOME:
  					// First visible node
  					this.visit(function(n) {
  						if (n.isVisible()) {
  							res = n;
  							return false;
  						}
  					});
  					break;
  				case "last":
  				case KC.END:
  					this.visit(function(n) {
  						// last visible node
  						if (n.isVisible()) {
  							res = n;
  						}
  					});
  					break;
  				case "left":
  				case KC.LEFT:
  					if (node.expanded) {
  						node.setExpanded(false);
  					} else if (node.parent && node.parent.parent) {
  						res = node.parent;
  					}
  					break;
  				case "right":
  				case KC.RIGHT:
  					if (!node.expanded && (node.children || node.lazy)) {
  						node.setExpanded();
  						res = node;
  					} else if (node.children && node.children.length) {
  						res = node.children[0];
  					}
  					break;
  				case "up":
  				case KC.UP:
  					this.visitRows(
  						function(n) {
  							res = n;
  							return false;
  						},
  						{ start: node, reverse: true, includeSelf: false }
  					);
  					break;
  				case "down":
  				case KC.DOWN:
  					this.visitRows(
  						function(n) {
  							res = n;
  							return false;
  						},
  						{ start: node, includeSelf: false }
  					);
  					break;
  				default:
  					this.tree.warn("Unknown relation '" + where + "'.");
  			}
  			return res;
  		},
  		// TODO: fromDict
  		/**
  		 * Generate INPUT elements that can be submitted with html forms.
  		 *
  		 * In selectMode 3 only the topmost selected nodes are considered, unless
  		 * `opts.stopOnParents: false` is passed.
  		 *
  		 * @example
  		 * // Generate input elements for active and selected nodes
  		 * tree.generateFormElements();
  		 * // Generate input elements selected nodes, using a custom `name` attribute
  		 * tree.generateFormElements("cust_sel", false);
  		 * // Generate input elements using a custom filter
  		 * tree.generateFormElements(true, true, { filter: function(node) {
  		 *     return node.isSelected() && node.data.yes;
  		 * }});
  		 *
  		 * @param {boolean | string} [selected=true] Pass false to disable, pass a string to override the field name (default: 'ft_ID[]')
  		 * @param {boolean | string} [active=true] Pass false to disable, pass a string to override the field name (default: 'ft_ID_active')
  		 * @param {object} [opts] default { filter: null, stopOnParents: true }
  		 */
  		generateFormElements: function(selected, active, opts) {
  			opts = opts || {};
  
  			var nodeList,
  				selectedName =
  					typeof selected === "string"
  						? selected
  						: "ft_" + this._id + "[]",
  				activeName =
  					typeof active === "string"
  						? active
  						: "ft_" + this._id + "_active",
  				id = "fancytree_result_" + this._id,
  				$result = $("#" + id),
  				stopOnParents =
  					this.options.selectMode === 3 &&
  					opts.stopOnParents !== false;
  
  			if ($result.length) {
  				$result.empty();
  			} else {
  				$result = $("<div>", {
  					id: id,
  				})
  					.hide()
  					.insertAfter(this.$container);
  			}
  			if (active !== false && this.activeNode) {
  				$result.append(
  					$("<input>", {
  						type: "radio",
  						name: activeName,
  						value: this.activeNode.key,
  						checked: true,
  					})
  				);
  			}
  			function _appender(node) {
  				$result.append(
  					$("<input>", {
  						type: "checkbox",
  						name: selectedName,
  						value: node.key,
  						checked: true,
  					})
  				);
  			}
  			if (opts.filter) {
  				this.visit(function(node) {
  					var res = opts.filter(node);
  					if (res === "skip") {
  						return res;
  					}
  					if (res !== false) {
  						_appender(node);
  					}
  				});
  			} else if (selected !== false) {
  				nodeList = this.getSelectedNodes(stopOnParents);
  				$.each(nodeList, function(idx, node) {
  					_appender(node);
  				});
  			}
  		},
  		/**
  		 * Return the currently active node or null.
  		 * @returns {FancytreeNode}
  		 */
  		getActiveNode: function() {
  			return this.activeNode;
  		},
  		/** Return the first top level node if any (not the invisible root node).
  		 * @returns {FancytreeNode | null}
  		 */
  		getFirstChild: function() {
  			return this.rootNode.getFirstChild();
  		},
  		/**
  		 * Return node that has keyboard focus or null.
  		 * @returns {FancytreeNode}
  		 */
  		getFocusNode: function() {
  			return this.focusNode;
  		},
  		/**
  		 * Return current option value.
  		 * (Note: this is the preferred variant of `$().fancytree("option", "KEY")`)
  		 *
  		 * @param {string} name option name (may contain '.')
  		 * @returns {any}
  		 */
  		getOption: function(optionName) {
  			return this.widget.option(optionName);
  		},
  		/**
  		 * Return node with a given key or null if not found.
  		 *
  		 * @param {string} key
  		 * @param {FancytreeNode} [searchRoot] only search below this node
  		 * @returns {FancytreeNode | null}
  		 */
  		getNodeByKey: function(key, searchRoot) {
  			// Search the DOM by element ID (assuming this is faster than traversing all nodes).
  			var el, match;
  			// TODO: use tree.keyMap if available
  			// TODO: check opts.generateIds === true
  			if (!searchRoot) {
  				el = document.getElementById(this.options.idPrefix + key);
  				if (el) {
  					return el.ftnode ? el.ftnode : null;
  				}
  			}
  			// Not found in the DOM, but still may be in an unrendered part of tree
  			searchRoot = searchRoot || this.rootNode;
  			match = null;
  			key = "" + key; // Convert to string (#1005)
  			searchRoot.visit(function(node) {
  				if (node.key === key) {
  					match = node;
  					return false; // Stop iteration
  				}
  			}, true);
  			return match;
  		},
  		/** Return the invisible system root node.
  		 * @returns {FancytreeNode}
  		 */
  		getRootNode: function() {
  			return this.rootNode;
  		},
  		/**
  		 * Return an array of selected nodes.
  		 *
  		 * Note: you cannot send this result via Ajax directly. Instead the
  		 * node object need to be converted to plain objects, for example
  		 * by using `$.map()` and `node.toDict()`.
  		 * @param {boolean} [stopOnParents=false] only return the topmost selected
  		 *     node (useful with selectMode 3)
  		 * @returns {FancytreeNode[]}
  		 */
  		getSelectedNodes: function(stopOnParents) {
  			return this.rootNode.getSelectedNodes(stopOnParents);
  		},
  		/** Return true if the tree control has keyboard focus
  		 * @returns {boolean}
  		 */
  		hasFocus: function() {
  			// var ae = document.activeElement,
  			// 	hasFocus = !!(
  			// 		ae && $(ae).closest(".fancytree-container").length
  			// 	);
  
  			// if (hasFocus !== !!this._hasFocus) {
  			// 	this.warn(
  			// 		"hasFocus(): fix inconsistent container state, now: " +
  			// 			hasFocus
  			// 	);
  			// 	this._hasFocus = hasFocus;
  			// 	this.$container.toggleClass("fancytree-treefocus", hasFocus);
  			// }
  			// return hasFocus;
  			return !!this._hasFocus;
  		},
  		/** Write to browser console if debugLevel >= 3 (prepending tree name)
  		 * @param {*} msg string or object or array of such
  		 */
  		info: function(msg) {
  			if (this.options.debugLevel >= 3) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("info", arguments);
  			}
  		},
  		/** Return true if any node is currently beeing loaded, i.e. a Ajax request is pending.
  		 * @returns {boolean}
  		 * @since 2.32
  		 */
  		isLoading: function() {
  			var res = false;
  
  			this.rootNode.visit(function(n) {
  				// also visit rootNode
  				if (n._isLoading || n._requestId) {
  					res = true;
  					return false;
  				}
  			}, true);
  			return res;
  		},
  		/*
  		TODO: isInitializing: function() {
  			return ( this.phase=="init" || this.phase=="postInit" );
  		},
  		TODO: isReloading: function() {
  			return ( this.phase=="init" || this.phase=="postInit" ) && this.options.persist && this.persistence.cookiesFound;
  		},
  		TODO: isUserEvent: function() {
  			return ( this.phase=="userEvent" );
  		},
  		*/
  
  		/**
  		 * Make sure that a node with a given ID is loaded, by traversing - and
  		 * loading - its parents. This method is meant for lazy hierarchies.
  		 * A callback is executed for every node as we go.
  		 * @example
  		 * // Resolve using node.key:
  		 * tree.loadKeyPath("/_3/_23/_26/_27", function(node, status){
  		 *   if(status === "loaded") {
  		 *     console.log("loaded intermediate node " + node);
  		 *   }else if(status === "ok") {
  		 *     node.activate();
  		 *   }
  		 * });
  		 * // Use deferred promise:
  		 * tree.loadKeyPath("/_3/_23/_26/_27").progress(function(data){
  		 *   if(data.status === "loaded") {
  		 *     console.log("loaded intermediate node " + data.node);
  		 *   }else if(data.status === "ok") {
  		 *     node.activate();
  		 *   }
  		 * }).done(function(){
  		 *    ...
  		 * });
  		 * // Custom path segment resolver:
  		 * tree.loadKeyPath("/321/431/21/2", {
  		 *   matchKey: function(node, key){
  		 *     return node.data.refKey === key;
  		 *   },
  		 *   callback: function(node, status){
  		 *     if(status === "loaded") {
  		 *       console.log("loaded intermediate node " + node);
  		 *     }else if(status === "ok") {
  		 *       node.activate();
  		 *     }
  		 *   }
  		 * });
  		 * @param {string | string[]} keyPathList one or more key paths (e.g. '/3/2_1/7')
  		 * @param {function | object} optsOrCallback callback(node, status) is called for every visited node ('loading', 'loaded', 'ok', 'error').
  		 *     Pass an object to define custom key matchers for the path segments: {callback: function, matchKey: function}.
  		 * @returns {$.Promise}
  		 */
  		loadKeyPath: function(keyPathList, optsOrCallback) {
  			var callback,
  				i,
  				path,
  				self = this,
  				dfd = new $.Deferred(),
  				parent = this.getRootNode(),
  				sep = this.options.keyPathSeparator,
  				pathSegList = [],
  				opts = $.extend({}, optsOrCallback);
  
  			// Prepare options
  			if (typeof optsOrCallback === "function") {
  				callback = optsOrCallback;
  			} else if (optsOrCallback && optsOrCallback.callback) {
  				callback = optsOrCallback.callback;
  			}
  			opts.callback = function(ctx, node, status) {
  				if (callback) {
  					callback.call(ctx, node, status);
  				}
  				dfd.notifyWith(ctx, [{ node: node, status: status }]);
  			};
  			if (opts.matchKey == null) {
  				opts.matchKey = function(node, key) {
  					return node.key === key;
  				};
  			}
  			// Convert array of path strings to array of segment arrays
  			if (!$.isArray(keyPathList)) {
  				keyPathList = [keyPathList];
  			}
  			for (i = 0; i < keyPathList.length; i++) {
  				path = keyPathList[i];
  				// strip leading slash
  				if (path.charAt(0) === sep) {
  					path = path.substr(1);
  				}
  				// segListMap[path] = { parent: parent, segList: path.split(sep) };
  				pathSegList.push(path.split(sep));
  				// targetList.push({ parent: parent, segList: path.split(sep)/* , path: path*/});
  			}
  			// The timeout forces async behavior always (even if nodes are all loaded)
  			// This way a potential progress() event will fire.
  			setTimeout(function() {
  				self._loadKeyPathImpl(dfd, opts, parent, pathSegList).done(
  					function() {
  						dfd.resolve();
  					}
  				);
  			}, 0);
  			return dfd.promise();
  		},
  		/*
  		 * Resolve a list of paths, relative to one parent node.
  		 */
  		_loadKeyPathImpl: function(dfd, opts, parent, pathSegList) {
  			var deferredList,
  				i,
  				key,
  				node,
  				nodeKey,
  				remain,
  				remainMap,
  				tmpParent,
  				segList,
  				subDfd,
  				self = this;
  
  			function __findChild(parent, key) {
  				// console.log("__findChild", key, parent);
  				var i,
  					l,
  					cl = parent.children;
  
  				if (cl) {
  					for (i = 0, l = cl.length; i < l; i++) {
  						if (opts.matchKey(cl[i], key)) {
  							return cl[i];
  						}
  					}
  				}
  				return null;
  			}
  
  			// console.log("_loadKeyPathImpl, parent=", parent, ", pathSegList=", pathSegList);
  
  			// Pass 1:
  			// Handle all path segments for nodes that are already loaded.
  			// Collect distinct top-most lazy nodes in a map.
  			// Note that we can use node.key to de-dupe entries, even if a custom matcher would
  			// look for other node attributes.
  			// map[node.key] => {node: node, pathList: [list of remaining rest-paths]}
  			remainMap = {};
  
  			for (i = 0; i < pathSegList.length; i++) {
  				segList = pathSegList[i];
  				// target = targetList[i];
  
  				// Traverse and pop path segments (i.e. keys), until we hit a lazy, unloaded node
  				tmpParent = parent;
  				while (segList.length) {
  					key = segList.shift();
  					node = __findChild(tmpParent, key);
  					if (!node) {
  						this.warn(
  							"loadKeyPath: key not found: " +
  								key +
  								" (parent: " +
  								tmpParent +
  								")"
  						);
  						opts.callback(this, key, "error");
  						break;
  					} else if (segList.length === 0) {
  						opts.callback(this, node, "ok");
  						break;
  					} else if (!node.lazy || node.hasChildren() !== undefined) {
  						opts.callback(this, node, "loaded");
  						tmpParent = node;
  					} else {
  						opts.callback(this, node, "loaded");
  						key = node.key; //target.segList.join(sep);
  						if (remainMap[key]) {
  							remainMap[key].pathSegList.push(segList);
  						} else {
  							remainMap[key] = {
  								parent: node,
  								pathSegList: [segList],
  							};
  						}
  						break;
  					}
  				}
  			}
  			// console.log("_loadKeyPathImpl AFTER pass 1, remainMap=", remainMap);
  
  			// Now load all lazy nodes and continue iteration for remaining paths
  			deferredList = [];
  
  			// Avoid jshint warning 'Don't make functions within a loop.':
  			function __lazyload(dfd, parent, pathSegList) {
  				// console.log("__lazyload", parent, "pathSegList=", pathSegList);
  				opts.callback(self, parent, "loading");
  				parent
  					.load()
  					.done(function() {
  						self._loadKeyPathImpl
  							.call(self, dfd, opts, parent, pathSegList)
  							.always(_makeResolveFunc(dfd, self));
  					})
  					.fail(function(errMsg) {
  						self.warn("loadKeyPath: error loading lazy " + parent);
  						opts.callback(self, node, "error");
  						dfd.rejectWith(self);
  					});
  			}
  			// remainMap contains parent nodes, each with a list of relative sub-paths.
  			// We start loading all of them now, and pass the the list to each loader.
  			for (nodeKey in remainMap) {
  				if (remainMap.hasOwnProperty(nodeKey)) {
  					remain = remainMap[nodeKey];
  					// console.log("for(): remain=", remain, "remainMap=", remainMap);
  					// key = remain.segList.shift();
  					// node = __findChild(remain.parent, key);
  					// if (node == null) {  // #576
  					// 	// Issue #576, refactored for v2.27:
  					// 	// The root cause was, that sometimes the wrong parent was used here
  					// 	// to find the next segment.
  					// 	// Falling back to getNodeByKey() was a hack that no longer works if a custom
  					// 	// matcher is used, because we cannot assume that a single segment-key is unique
  					// 	// throughout the tree.
  					// 	self.error("loadKeyPath: error loading child by key '" + key + "' (parent: " + target.parent + ")", target);
  					// 	// 	node = self.getNodeByKey(key);
  					// 	continue;
  					// }
  					subDfd = new $.Deferred();
  					deferredList.push(subDfd);
  					__lazyload(subDfd, remain.parent, remain.pathSegList);
  				}
  			}
  			// Return a promise that is resolved, when ALL paths were loaded
  			return $.when.apply($, deferredList).promise();
  		},
  		/** Re-fire beforeActivate, activate, and (optional) focus events.
  		 * Calling this method in the `init` event, will activate the node that
  		 * was marked 'active' in the source data, and optionally set the keyboard
  		 * focus.
  		 * @param [setFocus=false]
  		 */
  		reactivate: function(setFocus) {
  			var res,
  				node = this.activeNode;
  
  			if (!node) {
  				return _getResolvedPromise();
  			}
  			this.activeNode = null; // Force re-activating
  			res = node.setActive(true, { noFocus: true });
  			if (setFocus) {
  				node.setFocus();
  			}
  			return res;
  		},
  		/** Reload tree from source and return a promise.
  		 * @param [source] optional new source (defaults to initial source data)
  		 * @returns {$.Promise}
  		 */
  		reload: function(source) {
  			this._callHook("treeClear", this);
  			return this._callHook("treeLoad", this, source);
  		},
  		/**Render tree (i.e. create DOM elements for all top-level nodes).
  		 * @param {boolean} [force=false] create DOM elemnts, even if parent is collapsed
  		 * @param {boolean} [deep=false]
  		 */
  		render: function(force, deep) {
  			return this.rootNode.render(force, deep);
  		},
  		/**(De)select all nodes.
  		 * @param {boolean} [flag=true]
  		 * @since 2.28
  		 */
  		selectAll: function(flag) {
  			this.visit(function(node) {
  				node.setSelected(flag);
  			});
  		},
  		// TODO: selectKey: function(key, select)
  		// TODO: serializeArray: function(stopOnParents)
  		/**
  		 * @param {boolean} [flag=true]
  		 */
  		setFocus: function(flag) {
  			return this._callHook("treeSetFocus", this, flag);
  		},
  		/**
  		 * Set current option value.
  		 * (Note: this is the preferred variant of `$().fancytree("option", "KEY", VALUE)`)
  		 * @param {string} name option name (may contain '.')
  		 * @param {any} new value
  		 */
  		setOption: function(optionName, value) {
  			return this.widget.option(optionName, value);
  		},
  		/**
  		 * Call console.time() when in debug mode (verbose >= 4).
  		 *
  		 * @param {string} label
  		 */
  		debugTime: function(label) {
  			if (this.options.debugLevel >= 4) {
  				window.console.time(this + " - " + label);
  			}
  		},
  		/**
  		 * Call console.timeEnd() when in debug mode (verbose >= 4).
  		 *
  		 * @param {string} label
  		 */
  		debugTimeEnd: function(label) {
  			if (this.options.debugLevel >= 4) {
  				window.console.timeEnd(this + " - " + label);
  			}
  		},
  		/**
  		 * Return all nodes as nested list of {@link NodeData}.
  		 *
  		 * @param {boolean} [includeRoot=false] Returns the hidden system root node (and its children)
  		 * @param {function} [callback] callback(dict, node) is called for every node, in order to allow modifications.
  		 *     Return `false` to ignore this node or "skip" to include this node without its children.
  		 * @returns {Array | object}
  		 * @see FancytreeNode#toDict
  		 */
  		toDict: function(includeRoot, callback) {
  			var res = this.rootNode.toDict(true, callback);
  			return includeRoot ? res : res.children;
  		},
  		/* Implicitly called for string conversions.
  		 * @returns {string}
  		 */
  		toString: function() {
  			return "Fancytree@" + this._id;
  			// return "<Fancytree(#" + this._id + ")>";
  		},
  		/* _trigger a widget event with additional node ctx.
  		 * @see EventData
  		 */
  		_triggerNodeEvent: function(type, node, originalEvent, extra) {
  			// this.debug("_trigger(" + type + "): '" + ctx.node.title + "'", ctx);
  			var ctx = this._makeHookContext(node, originalEvent, extra),
  				res = this.widget._trigger(type, originalEvent, ctx);
  			if (res !== false && ctx.result !== undefined) {
  				return ctx.result;
  			}
  			return res;
  		},
  		/* _trigger a widget event with additional tree data. */
  		_triggerTreeEvent: function(type, originalEvent, extra) {
  			// this.debug("_trigger(" + type + ")", ctx);
  			var ctx = this._makeHookContext(this, originalEvent, extra),
  				res = this.widget._trigger(type, originalEvent, ctx);
  
  			if (res !== false && ctx.result !== undefined) {
  				return ctx.result;
  			}
  			return res;
  		},
  		/** Call fn(node) for all nodes in hierarchical order (depth-first).
  		 *
  		 * @param {function} fn the callback function.
  		 *     Return false to stop iteration, return "skip" to skip this node and children only.
  		 * @returns {boolean} false, if the iterator was stopped.
  		 */
  		visit: function(fn) {
  			return this.rootNode.visit(fn, false);
  		},
  		/** Call fn(node) for all nodes in vertical order, top down (or bottom up).<br>
  		 * Stop iteration, if fn() returns false.<br>
  		 * Return false if iteration was stopped.
  		 *
  		 * @param {function} fn the callback function.
  		 *     Return false to stop iteration, return "skip" to skip this node and children only.
  		 * @param {object} [options]
  		 *     Defaults:
  		 *     {start: First top node, reverse: false, includeSelf: true, includeHidden: false}
  		 * @returns {boolean} false if iteration was cancelled
  		 * @since 2.28
  		 */
  		visitRows: function(fn, opts) {
  			if (!this.rootNode.hasChildren()) {
  				return false;
  			}
  			if (opts && opts.reverse) {
  				delete opts.reverse;
  				return this._visitRowsUp(fn, opts);
  			}
  			opts = opts || {};
  
  			var i,
  				nextIdx,
  				parent,
  				res,
  				siblings,
  				siblingOfs = 0,
  				skipFirstNode = opts.includeSelf === false,
  				includeHidden = !!opts.includeHidden,
  				checkFilter = !includeHidden && this.enableFilter,
  				node = opts.start || this.rootNode.children[0];
  
  			parent = node.parent;
  			while (parent) {
  				// visit siblings
  				siblings = parent.children;
  				nextIdx = siblings.indexOf(node) + siblingOfs;
  
  				for (i = nextIdx; i < siblings.length; i++) {
  					node = siblings[i];
  					if (checkFilter && !node.match && !node.subMatchCount) {
  						continue;
  					}
  					if (!skipFirstNode && fn(node) === false) {
  						return false;
  					}
  					skipFirstNode = false;
  					// Dive into node's child nodes
  					if (
  						node.children &&
  						node.children.length &&
  						(includeHidden || node.expanded)
  					) {
  						// Disable warning: Functions declared within loops referencing an outer
  						// scoped variable may lead to confusing semantics:
  						/*jshint -W083 */
  						res = node.visit(function(n) {
  							if (checkFilter && !n.match && !n.subMatchCount) {
  								return "skip";
  							}
  							if (fn(n) === false) {
  								return false;
  							}
  							if (!includeHidden && n.children && !n.expanded) {
  								return "skip";
  							}
  						}, false);
  						/*jshint +W083 */
  						if (res === false) {
  							return false;
  						}
  					}
  				}
  				// Visit parent nodes (bottom up)
  				node = parent;
  				parent = parent.parent;
  				siblingOfs = 1; //
  			}
  			return true;
  		},
  		/* Call fn(node) for all nodes in vertical order, bottom up.
  		 */
  		_visitRowsUp: function(fn, opts) {
  			var children,
  				idx,
  				parent,
  				includeHidden = !!opts.includeHidden,
  				node = opts.start || this.rootNode.children[0];
  
  			while (true) {
  				parent = node.parent;
  				children = parent.children;
  
  				if (children[0] === node) {
  					// If this is already the first sibling, goto parent
  					node = parent;
  					if (!node.parent) {
  						break; // first node of the tree
  					}
  					children = parent.children;
  				} else {
  					// Otherwise, goto prev. sibling
  					idx = children.indexOf(node);
  					node = children[idx - 1];
  					// If the prev. sibling has children, follow down to last descendant
  					while (
  						// See: https://github.com/eslint/eslint/issues/11302
  						// eslint-disable-next-line no-unmodified-loop-condition
  						(includeHidden || node.expanded) &&
  						node.children &&
  						node.children.length
  					) {
  						children = node.children;
  						parent = node;
  						node = children[children.length - 1];
  					}
  				}
  				// Skip invisible
  				if (!includeHidden && !node.isVisible()) {
  					continue;
  				}
  				if (fn(node) === false) {
  					return false;
  				}
  			}
  		},
  		/** Write warning to browser console if debugLevel >= 2 (prepending tree info)
  		 *
  		 * @param {*} msg string or object or array of such
  		 */
  		warn: function(msg) {
  			if (this.options.debugLevel >= 2) {
  				Array.prototype.unshift.call(arguments, this.toString());
  				consoleApply("warn", arguments);
  			}
  		},
  	};
  
  	/**
  	 * These additional methods of the {@link Fancytree} class are 'hook functions'
  	 * that can be used and overloaded by extensions.
  	 *
  	 * @see [writing extensions](https://github.com/mar10/fancytree/wiki/TutorialExtensions)
  	 * @mixin Fancytree_Hooks
  	 */
  	$.extend(
  		Fancytree.prototype,
  		/** @lends Fancytree_Hooks# */
  		{
  			/** Default handling for mouse click events.
  			 *
  			 * @param {EventData} ctx
  			 */
  			nodeClick: function(ctx) {
  				var activate,
  					expand,
  					// event = ctx.originalEvent,
  					targetType = ctx.targetType,
  					node = ctx.node;
  
  				// this.debug("ftnode.onClick(" + event.type + "): ftnode:" + this + ", button:" + event.button + ", which: " + event.which, ctx);
  				// TODO: use switch
  				// TODO: make sure clicks on embedded <input> doesn't steal focus (see table sample)
  				if (targetType === "expander") {
  					if (node.isLoading()) {
  						// #495: we probably got a click event while a lazy load is pending.
  						// The 'expanded' state is not yet set, so 'toggle' would expand
  						// and trigger lazyLoad again.
  						// It would be better to allow to collapse/expand the status node
  						// while loading (instead of ignoring), but that would require some
  						// more work.
  						node.debug("Got 2nd click while loading: ignored");
  						return;
  					}
  					// Clicking the expander icon always expands/collapses
  					this._callHook("nodeToggleExpanded", ctx);
  				} else if (targetType === "checkbox") {
  					// Clicking the checkbox always (de)selects
  					this._callHook("nodeToggleSelected", ctx);
  					if (ctx.options.focusOnSelect) {
  						// #358
  						this._callHook("nodeSetFocus", ctx, true);
  					}
  				} else {
  					// Honor `clickFolderMode` for
  					expand = false;
  					activate = true;
  					if (node.folder) {
  						switch (ctx.options.clickFolderMode) {
  							case 2: // expand only
  								expand = true;
  								activate = false;
  								break;
  							case 3: // expand and activate
  								activate = true;
  								expand = true; //!node.isExpanded();
  								break;
  							// else 1 or 4: just activate
  						}
  					}
  					if (activate) {
  						this.nodeSetFocus(ctx);
  						this._callHook("nodeSetActive", ctx, true);
  					}
  					if (expand) {
  						if (!activate) {
  							// this._callHook("nodeSetFocus", ctx);
  						}
  						// this._callHook("nodeSetExpanded", ctx, true);
  						this._callHook("nodeToggleExpanded", ctx);
  					}
  				}
  				// Make sure that clicks stop, otherwise <a href='#'> jumps to the top
  				// if(event.target.localName === "a" && event.target.className === "fancytree-title"){
  				// 	event.preventDefault();
  				// }
  				// TODO: return promise?
  			},
  			/** Collapse all other  children of same parent.
  			 *
  			 * @param {EventData} ctx
  			 * @param {object} callOpts
  			 */
  			nodeCollapseSiblings: function(ctx, callOpts) {
  				// TODO: return promise?
  				var ac,
  					i,
  					l,
  					node = ctx.node;
  
  				if (node.parent) {
  					ac = node.parent.children;
  					for (i = 0, l = ac.length; i < l; i++) {
  						if (ac[i] !== node && ac[i].expanded) {
  							this._callHook(
  								"nodeSetExpanded",
  								ac[i],
  								false,
  								callOpts
  							);
  						}
  					}
  				}
  			},
  			/** Default handling for mouse douleclick events.
  			 * @param {EventData} ctx
  			 */
  			nodeDblclick: function(ctx) {
  				// TODO: return promise?
  				if (
  					ctx.targetType === "title" &&
  					ctx.options.clickFolderMode === 4
  				) {
  					// this.nodeSetFocus(ctx);
  					// this._callHook("nodeSetActive", ctx, true);
  					this._callHook("nodeToggleExpanded", ctx);
  				}
  				// TODO: prevent text selection on dblclicks
  				if (ctx.targetType === "title") {
  					ctx.originalEvent.preventDefault();
  				}
  			},
  			/** Default handling for mouse keydown events.
  			 *
  			 * NOTE: this may be called with node == null if tree (but no node) has focus.
  			 * @param {EventData} ctx
  			 */
  			nodeKeydown: function(ctx) {
  				// TODO: return promise?
  				var matchNode,
  					stamp,
  					_res,
  					focusNode,
  					event = ctx.originalEvent,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					which = event.which,
  					// #909: Use event.key, to get unicode characters.
  					// We can't use `/\w/.test(key)`, because that would
  					// only detect plain ascii alpha-numerics. But we still need
  					// to ignore modifier-only, whitespace, cursor-keys, etc.
  					key = event.key || String.fromCharCode(which),
  					specialModifiers = !!(
  						event.altKey ||
  						event.ctrlKey ||
  						event.metaKey
  					),
  					isAlnum =
  						!MODIFIERS[which] &&
  						!SPECIAL_KEYCODES[which] &&
  						!specialModifiers,
  					$target = $(event.target),
  					handled = true,
  					activate = !(event.ctrlKey || !opts.autoActivate);
  
  				// (node || FT).debug("ftnode.nodeKeydown(" + event.type + "): ftnode:" + this + ", charCode:" + event.charCode + ", keyCode: " + event.keyCode + ", which: " + event.which);
  				// FT.debug( "eventToString(): " + FT.eventToString(event) + ", key='" + key + "', isAlnum: " + isAlnum );
  
  				// Set focus to active (or first node) if no other node has the focus yet
  				if (!node) {
  					focusNode = this.getActiveNode() || this.getFirstChild();
  					if (focusNode) {
  						focusNode.setFocus();
  						node = ctx.node = this.focusNode;
  						node.debug("Keydown force focus on active node");
  					}
  				}
  
  				if (
  					opts.quicksearch &&
  					isAlnum &&
  					!$target.is(":input:enabled")
  				) {
  					// Allow to search for longer streaks if typed in quickly
  					stamp = Date.now();
  					if (stamp - tree.lastQuicksearchTime > 500) {
  						tree.lastQuicksearchTerm = "";
  					}
  					tree.lastQuicksearchTime = stamp;
  					tree.lastQuicksearchTerm += key;
  					// tree.debug("quicksearch find", tree.lastQuicksearchTerm);
  					matchNode = tree.findNextNode(
  						tree.lastQuicksearchTerm,
  						tree.getActiveNode()
  					);
  					if (matchNode) {
  						matchNode.setActive();
  					}
  					event.preventDefault();
  					return;
  				}
  				switch (FT.eventToString(event)) {
  					case "+":
  					case "=": // 187: '+' @ Chrome, Safari
  						tree.nodeSetExpanded(ctx, true);
  						break;
  					case "-":
  						tree.nodeSetExpanded(ctx, false);
  						break;
  					case "space":
  						if (node.isPagingNode()) {
  							tree._triggerNodeEvent("clickPaging", ctx, event);
  						} else if (
  							FT.evalOption("checkbox", node, node, opts, false)
  						) {
  							// #768
  							tree.nodeToggleSelected(ctx);
  						} else {
  							tree.nodeSetActive(ctx, true);
  						}
  						break;
  					case "return":
  						tree.nodeSetActive(ctx, true);
  						break;
  					case "home":
  					case "end":
  					case "backspace":
  					case "left":
  					case "right":
  					case "up":
  					case "down":
  						_res = node.navigate(event.which, activate);
  						break;
  					default:
  						handled = false;
  				}
  				if (handled) {
  					event.preventDefault();
  				}
  			},
  
  			// /** Default handling for mouse keypress events. */
  			// nodeKeypress: function(ctx) {
  			//     var event = ctx.originalEvent;
  			// },
  
  			// /** Trigger lazyLoad event (async). */
  			// nodeLazyLoad: function(ctx) {
  			//     var node = ctx.node;
  			//     if(this._triggerNodeEvent())
  			// },
  			/** Load child nodes (async).
  			 *
  			 * @param {EventData} ctx
  			 * @param {object[]|object|string|$.Promise|function} source
  			 * @returns {$.Promise} The deferred will be resolved as soon as the (ajax)
  			 *     data was rendered.
  			 */
  			nodeLoadChildren: function(ctx, source) {
  				var ajax,
  					delay,
  					ajaxDfd = null,
  					resultDfd,
  					isAsync = true,
  					tree = ctx.tree,
  					node = ctx.node,
  					nodePrevParent = node.parent,
  					tag = "nodeLoadChildren",
  					requestId = Date.now();
  
  				// `source` is a callback: use the returned result instead:
  				if ($.isFunction(source)) {
  					source = source.call(tree, { type: "source" }, ctx);
  					_assert(
  						!$.isFunction(source),
  						"source callback must not return another function"
  					);
  				}
  				// `source` is already a promise:
  				if ($.isFunction(source.then)) {
  					// _assert($.isFunction(source.always), "Expected jQuery?");
  					ajaxDfd = source;
  				} else if (source.url) {
  					// `source` is an Ajax options object
  					ajax = $.extend({}, ctx.options.ajax, source);
  					if (ajax.debugDelay) {
  						// Simulate a slow server
  						delay = ajax.debugDelay;
  						delete ajax.debugDelay; // remove debug option
  						if ($.isArray(delay)) {
  							// random delay range [min..max]
  							delay =
  								delay[0] +
  								Math.random() * (delay[1] - delay[0]);
  						}
  						node.warn(
  							"nodeLoadChildren waiting debugDelay " +
  								Math.round(delay) +
  								" ms ..."
  						);
  						ajaxDfd = $.Deferred(function(ajaxDfd) {
  							setTimeout(function() {
  								$.ajax(ajax)
  									.done(function() {
  										ajaxDfd.resolveWith(this, arguments);
  									})
  									.fail(function() {
  										ajaxDfd.rejectWith(this, arguments);
  									});
  							}, delay);
  						});
  					} else {
  						ajaxDfd = $.ajax(ajax);
  					}
  				} else if ($.isPlainObject(source) || $.isArray(source)) {
  					// `source` is already a constant dict or list, but we convert
  					// to a thenable for unified processing.
  					// 2020-01-03: refactored.
  					// `ajaxDfd = $.when(source)` would do the trick, but the returned
  					// promise will resolve async, which broke some tests and
  					// would probably also break current implementations out there.
  					// So we mock-up a thenable that resolves synchronously:
  					ajaxDfd = {
  						then: function(resolve, reject) {
  							resolve(source, null, null);
  						},
  					};
  					isAsync = false;
  				} else {
  					$.error("Invalid source type: " + source);
  				}
  
  				// Check for overlapping requests
  				if (node._requestId) {
  					node.warn(
  						"Recursive load request #" +
  							requestId +
  							" while #" +
  							node._requestId +
  							" is pending."
  					);
  					node._requestId = requestId;
  					// 	node.debug("Send load request #" + requestId);
  				}
  
  				if (isAsync) {
  					tree.debugTime(tag);
  					tree.nodeSetStatus(ctx, "loading");
  				}
  
  				// The async Ajax request has now started...
  				// Defer the deferred:
  				// we want to be able to reject invalid responses, even if
  				// the raw HTTP Ajax XHR resolved as Ok.
  				// We use the ajaxDfd.then() syntax here, which is compatible with
  				// jQuery and ECMA6.
  				// However resultDfd is a jQuery deferred, which is currently the
  				// expected result type of nodeLoadChildren()
  				resultDfd = new $.Deferred();
  				ajaxDfd.then(
  					function(data, textStatus, jqXHR) {
  						// ajaxDfd was resolved, but we reject or resolve resultDfd
  						// depending on the response data
  						var errorObj, res;
  
  						if (
  							(source.dataType === "json" ||
  								source.dataType === "jsonp") &&
  							typeof data === "string"
  						) {
  							$.error(
  								"Ajax request returned a string (did you get the JSON dataType wrong?)."
  							);
  						}
  						if (node._requestId && node._requestId > requestId) {
  							// The expected request time stamp is later than `requestId`
  							// (which was kept as as closure variable to this handler function)
  							// node.warn("Ignored load response for obsolete request #" + requestId + " (expected #" + node._requestId + ")");
  							resultDfd.rejectWith(this, [
  								RECURSIVE_REQUEST_ERROR,
  							]);
  							return;
  							// } else {
  							// 	node.debug("Response returned for load request #" + requestId);
  						}
  						if (node.parent === null && nodePrevParent !== null) {
  							resultDfd.rejectWith(this, [
  								INVALID_REQUEST_TARGET_ERROR,
  							]);
  							return;
  						}
  						// Allow to adjust the received response data in the `postProcess` event.
  						if (ctx.options.postProcess) {
  							// The handler may either
  							//   - modify `ctx.response` in-place (and leave `ctx.result` undefined)
  							//     => res = undefined
  							//   - return a replacement in `ctx.result`
  							//     => res = <new data>
  							//   If res contains an `error` property, an error status is displayed
  							try {
  								res = tree._triggerNodeEvent(
  									"postProcess",
  									ctx,
  									ctx.originalEvent,
  									{
  										response: data,
  										error: null,
  										dataType: source.dataType,
  									}
  								);
  								if (res.error) {
  									tree.warn(
  										"postProcess returned error:",
  										res
  									);
  								}
  							} catch (e) {
  								res = {
  									error: e,
  									message: "" + e,
  									details: "postProcess failed",
  								};
  							}
  							if (res.error) {
  								// Either postProcess failed with an exception, or the returned
  								// result object has an 'error' property attached:
  								errorObj = $.isPlainObject(res.error)
  									? res.error
  									: { message: res.error };
  								errorObj = tree._makeHookContext(
  									node,
  									null,
  									errorObj
  								);
  								resultDfd.rejectWith(this, [errorObj]);
  								return;
  							}
  							if (
  								$.isArray(res) ||
  								($.isPlainObject(res) &&
  									$.isArray(res.children))
  							) {
  								// Use `ctx.result` if valid
  								// (otherwise use existing data, which may have been modified in-place)
  								data = res;
  							}
  						} else if (
  							data &&
  							data.hasOwnProperty("d") &&
  							ctx.options.enableAspx
  						) {
  							// Process ASPX WebMethod JSON object inside "d" property
  							// (only if no postProcess event was defined)
  							if (ctx.options.enableAspx === 42) {
  								tree.warn(
  									"The default for enableAspx will change to `false` in the fututure. " +
  										"Pass `enableAspx: true` or implement postProcess to silence this warning."
  								);
  							}
  							data =
  								typeof data.d === "string"
  									? $.parseJSON(data.d)
  									: data.d;
  						}
  						resultDfd.resolveWith(this, [data]);
  					},
  					function(jqXHR, textStatus, errorThrown) {
  						// ajaxDfd was rejected, so we reject resultDfd as well
  						var errorObj = tree._makeHookContext(node, null, {
  							error: jqXHR,
  							args: Array.prototype.slice.call(arguments),
  							message: errorThrown,
  							details: jqXHR.status + ": " + errorThrown,
  						});
  						resultDfd.rejectWith(this, [errorObj]);
  					}
  				);
  
  				// The async Ajax request has now started.
  				// resultDfd will be resolved/rejected after the response arrived,
  				// was postProcessed, and checked.
  				// Now we implement the UI update and add the data to the tree.
  				// We also return this promise to the caller.
  				resultDfd
  					.done(function(data) {
  						tree.nodeSetStatus(ctx, "ok");
  						var children, metaData, noDataRes;
  
  						if ($.isPlainObject(data)) {
  							// We got {foo: 'abc', children: [...]}
  							// Copy extra properties to tree.data.foo
  							_assert(
  								node.isRootNode(),
  								"source may only be an object for root nodes (expecting an array of child objects otherwise)"
  							);
  							_assert(
  								$.isArray(data.children),
  								"if an object is passed as source, it must contain a 'children' array (all other properties are added to 'tree.data')"
  							);
  							metaData = data;
  							children = data.children;
  							delete metaData.children;
  							// Copy some attributes to tree.data
  							$.each(TREE_ATTRS, function(i, attr) {
  								if (metaData[attr] !== undefined) {
  									tree[attr] = metaData[attr];
  									delete metaData[attr];
  								}
  							});
  							// Copy all other attributes to tree.data.NAME
  							$.extend(tree.data, metaData);
  						} else {
  							children = data;
  						}
  						_assert(
  							$.isArray(children),
  							"expected array of children"
  						);
  						node._setChildren(children);
  
  						if (tree.options.nodata && children.length === 0) {
  							if ($.isFunction(tree.options.nodata)) {
  								noDataRes = tree.options.nodata.call(
  									tree,
  									{ type: "nodata" },
  									ctx
  								);
  							} else if (
  								tree.options.nodata === true &&
  								node.isRootNode()
  							) {
  								noDataRes = tree.options.strings.noData;
  							} else if (
  								typeof tree.options.nodata === "string" &&
  								node.isRootNode()
  							) {
  								noDataRes = tree.options.nodata;
  							}
  							if (noDataRes) {
  								node.setStatus("nodata", noDataRes);
  							}
  						}
  						// trigger fancytreeloadchildren
  						tree._triggerNodeEvent("loadChildren", node);
  					})
  					.fail(function(error) {
  						var ctxErr;
  
  						if (error === RECURSIVE_REQUEST_ERROR) {
  							node.warn(
  								"Ignored response for obsolete load request #" +
  									requestId +
  									" (expected #" +
  									node._requestId +
  									")"
  							);
  							return;
  						} else if (error === INVALID_REQUEST_TARGET_ERROR) {
  							node.warn(
  								"Lazy parent node was removed while loading: discarding response."
  							);
  							return;
  						} else if (error.node && error.error && error.message) {
  							// error is already a context object
  							ctxErr = error;
  						} else {
  							ctxErr = tree._makeHookContext(node, null, {
  								error: error, // it can be jqXHR or any custom error
  								args: Array.prototype.slice.call(arguments),
  								message: error
  									? error.message || error.toString()
  									: "",
  							});
  							if (ctxErr.message === "[object Object]") {
  								ctxErr.message = "";
  							}
  						}
  						node.warn(
  							"Load children failed (" + ctxErr.message + ")",
  							ctxErr
  						);
  						if (
  							tree._triggerNodeEvent(
  								"loadError",
  								ctxErr,
  								null
  							) !== false
  						) {
  							tree.nodeSetStatus(
  								ctx,
  								"error",
  								ctxErr.message,
  								ctxErr.details
  							);
  						}
  					})
  					.always(function() {
  						node._requestId = null;
  						if (isAsync) {
  							tree.debugTimeEnd(tag);
  						}
  					});
  
  				return resultDfd.promise();
  			},
  			/** [Not Implemented]  */
  			nodeLoadKeyPath: function(ctx, keyPathList) {
  				// TODO: implement and improve
  				// http://code.google.com/p/dynatree/issues/detail?id=222
  			},
  			/**
  			 * Remove a single direct child of ctx.node.
  			 * @param {EventData} ctx
  			 * @param {FancytreeNode} childNode dircect child of ctx.node
  			 */
  			nodeRemoveChild: function(ctx, childNode) {
  				var idx,
  					node = ctx.node,
  					// opts = ctx.options,
  					subCtx = $.extend({}, ctx, { node: childNode }),
  					children = node.children;
  
  				// FT.debug("nodeRemoveChild()", node.toString(), childNode.toString());
  
  				if (children.length === 1) {
  					_assert(childNode === children[0], "invalid single child");
  					return this.nodeRemoveChildren(ctx);
  				}
  				if (
  					this.activeNode &&
  					(childNode === this.activeNode ||
  						this.activeNode.isDescendantOf(childNode))
  				) {
  					this.activeNode.setActive(false); // TODO: don't fire events
  				}
  				if (
  					this.focusNode &&
  					(childNode === this.focusNode ||
  						this.focusNode.isDescendantOf(childNode))
  				) {
  					this.focusNode = null;
  				}
  				// TODO: persist must take care to clear select and expand cookies
  				this.nodeRemoveMarkup(subCtx);
  				this.nodeRemoveChildren(subCtx);
  				idx = $.inArray(childNode, children);
  				_assert(idx >= 0, "invalid child");
  				// Notify listeners
  				node.triggerModifyChild("remove", childNode);
  				// Unlink to support GC
  				childNode.visit(function(n) {
  					n.parent = null;
  				}, true);
  				this._callHook("treeRegisterNode", this, false, childNode);
  				// remove from child list
  				children.splice(idx, 1);
  			},
  			/**Remove HTML markup for all descendents of ctx.node.
  			 * @param {EventData} ctx
  			 */
  			nodeRemoveChildMarkup: function(ctx) {
  				var node = ctx.node;
  
  				// FT.debug("nodeRemoveChildMarkup()", node.toString());
  				// TODO: Unlink attr.ftnode to support GC
  				if (node.ul) {
  					if (node.isRootNode()) {
  						$(node.ul).empty();
  					} else {
  						$(node.ul).remove();
  						node.ul = null;
  					}
  					node.visit(function(n) {
  						n.li = n.ul = null;
  					});
  				}
  			},
  			/**Remove all descendants of ctx.node.
  			 * @param {EventData} ctx
  			 */
  			nodeRemoveChildren: function(ctx) {
  				var //subCtx,
  					tree = ctx.tree,
  					node = ctx.node,
  					children = node.children;
  				// opts = ctx.options;
  
  				// FT.debug("nodeRemoveChildren()", node.toString());
  				if (!children) {
  					return;
  				}
  				if (this.activeNode && this.activeNode.isDescendantOf(node)) {
  					this.activeNode.setActive(false); // TODO: don't fire events
  				}
  				if (this.focusNode && this.focusNode.isDescendantOf(node)) {
  					this.focusNode = null;
  				}
  				// TODO: persist must take care to clear select and expand cookies
  				this.nodeRemoveChildMarkup(ctx);
  				// Unlink children to support GC
  				// TODO: also delete this.children (not possible using visit())
  				// subCtx = $.extend({}, ctx);
  				node.triggerModifyChild("remove", null);
  				node.visit(function(n) {
  					n.parent = null;
  					tree._callHook("treeRegisterNode", tree, false, n);
  				});
  				if (node.lazy) {
  					// 'undefined' would be interpreted as 'not yet loaded' for lazy nodes
  					node.children = [];
  				} else {
  					node.children = null;
  				}
  				if (!node.isRootNode()) {
  					node.expanded = false; // #449, #459
  				}
  				this.nodeRenderStatus(ctx);
  			},
  			/**Remove HTML markup for ctx.node and all its descendents.
  			 * @param {EventData} ctx
  			 */
  			nodeRemoveMarkup: function(ctx) {
  				var node = ctx.node;
  				// FT.debug("nodeRemoveMarkup()", node.toString());
  				// TODO: Unlink attr.ftnode to support GC
  				if (node.li) {
  					$(node.li).remove();
  					node.li = null;
  				}
  				this.nodeRemoveChildMarkup(ctx);
  			},
  			/**
  			 * Create `<li><span>..</span> .. </li>` tags for this node.
  			 *
  			 * This method takes care that all HTML markup is created that is required
  			 * to display this node in its current state.
  			 *
  			 * Call this method to create new nodes, or after the strucuture
  			 * was changed (e.g. after moving this node or adding/removing children)
  			 * nodeRenderTitle() and nodeRenderStatus() are implied.
  			 *
  			 * ```html
  			 * <li id='KEY' ftnode=NODE>
  			 *     <span class='fancytree-node fancytree-expanded fancytree-has-children fancytree-lastsib fancytree-exp-el fancytree-ico-e'>
  			 *         <span class="fancytree-expander"></span>
  			 *         <span class="fancytree-checkbox"></span> // only present in checkbox mode
  			 *         <span class="fancytree-icon"></span>
  			 *         <a href="#" class="fancytree-title"> Node 1 </a>
  			 *     </span>
  			 *     <ul> // only present if node has children
  			 *         <li id='KEY' ftnode=NODE> child1 ... </li>
  			 *         <li id='KEY' ftnode=NODE> child2 ... </li>
  			 *     </ul>
  			 * </li>
  			 * ```
  			 *
  			 * @param {EventData} ctx
  			 * @param {boolean} [force=false] re-render, even if html markup was already created
  			 * @param {boolean} [deep=false] also render all descendants, even if parent is collapsed
  			 * @param {boolean} [collapsed=false] force root node to be collapsed, so we can apply animated expand later
  			 */
  			nodeRender: function(ctx, force, deep, collapsed, _recursive) {
  				/* This method must take care of all cases where the current data mode
  				 * (i.e. node hierarchy) does not match the current markup.
  				 *
  				 * - node was not yet rendered:
  				 *   create markup
  				 * - node was rendered: exit fast
  				 * - children have been added
  				 * - children have been removed
  				 */
  				var childLI,
  					childNode1,
  					childNode2,
  					i,
  					l,
  					next,
  					subCtx,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					aria = opts.aria,
  					firstTime = false,
  					parent = node.parent,
  					isRootNode = !parent,
  					children = node.children,
  					successorLi = null;
  				// FT.debug("nodeRender(" + !!force + ", " + !!deep + ")", node.toString());
  
  				if (tree._enableUpdate === false) {
  					// tree.debug("no render", tree._enableUpdate);
  					return;
  				}
  				if (!isRootNode && !parent.ul) {
  					// Calling node.collapse on a deep, unrendered node
  					return;
  				}
  				_assert(isRootNode || parent.ul, "parent UL must exist");
  
  				// Render the node
  				if (!isRootNode) {
  					// Discard markup on force-mode, or if it is not linked to parent <ul>
  					if (
  						node.li &&
  						(force || node.li.parentNode !== node.parent.ul)
  					) {
  						if (node.li.parentNode === node.parent.ul) {
  							// #486: store following node, so we can insert the new markup there later
  							successorLi = node.li.nextSibling;
  						} else {
  							// May happen, when a top-level node was dropped over another
  							this.debug(
  								"Unlinking " +
  									node +
  									" (must be child of " +
  									node.parent +
  									")"
  							);
  						}
  						//	            this.debug("nodeRemoveMarkup...");
  						this.nodeRemoveMarkup(ctx);
  					}
  					// Create <li><span /> </li>
  					// node.debug("render...");
  					if (node.li) {
  						// this.nodeRenderTitle(ctx);
  						this.nodeRenderStatus(ctx);
  					} else {
  						// node.debug("render... really");
  						firstTime = true;
  						node.li = document.createElement("li");
  						node.li.ftnode = node;
  
  						if (node.key && opts.generateIds) {
  							node.li.id = opts.idPrefix + node.key;
  						}
  						node.span = document.createElement("span");
  						node.span.className = "fancytree-node";
  						if (aria && !node.tr) {
  							$(node.li).attr("role", "treeitem");
  						}
  						node.li.appendChild(node.span);
  
  						// Create inner HTML for the <span> (expander, checkbox, icon, and title)
  						this.nodeRenderTitle(ctx);
  
  						// Allow tweaking and binding, after node was created for the first time
  						if (opts.createNode) {
  							opts.createNode.call(
  								tree,
  								{ type: "createNode" },
  								ctx
  							);
  						}
  					}
  					// Allow tweaking after node state was rendered
  					if (opts.renderNode) {
  						opts.renderNode.call(tree, { type: "renderNode" }, ctx);
  					}
  				}
  
  				// Visit child nodes
  				if (children) {
  					if (isRootNode || node.expanded || deep === true) {
  						// Create a UL to hold the children
  						if (!node.ul) {
  							node.ul = document.createElement("ul");
  							if (
  								(collapsed === true && !_recursive) ||
  								!node.expanded
  							) {
  								// hide top UL, so we can use an animation to show it later
  								node.ul.style.display = "none";
  							}
  							if (aria) {
  								$(node.ul).attr("role", "group");
  							}
  							if (node.li) {
  								// issue #67
  								node.li.appendChild(node.ul);
  							} else {
  								node.tree.$div.append(node.ul);
  							}
  						}
  						// Add child markup
  						for (i = 0, l = children.length; i < l; i++) {
  							subCtx = $.extend({}, ctx, { node: children[i] });
  							this.nodeRender(subCtx, force, deep, false, true);
  						}
  						// Remove <li> if nodes have moved to another parent
  						childLI = node.ul.firstChild;
  						while (childLI) {
  							childNode2 = childLI.ftnode;
  							if (childNode2 && childNode2.parent !== node) {
  								node.debug(
  									"_fixParent: remove missing " + childNode2,
  									childLI
  								);
  								next = childLI.nextSibling;
  								childLI.parentNode.removeChild(childLI);
  								childLI = next;
  							} else {
  								childLI = childLI.nextSibling;
  							}
  						}
  						// Make sure, that <li> order matches node.children order.
  						childLI = node.ul.firstChild;
  						for (i = 0, l = children.length - 1; i < l; i++) {
  							childNode1 = children[i];
  							childNode2 = childLI.ftnode;
  							if (childNode1 === childNode2) {
  								childLI = childLI.nextSibling;
  							} else {
  								// node.debug("_fixOrder: mismatch at index " + i + ": " + childNode1 + " != " + childNode2);
  								node.ul.insertBefore(
  									childNode1.li,
  									childNode2.li
  								);
  							}
  						}
  					}
  				} else {
  					// No children: remove markup if any
  					if (node.ul) {
  						// alert("remove child markup for " + node);
  						this.warn("remove child markup for " + node);
  						this.nodeRemoveChildMarkup(ctx);
  					}
  				}
  				if (!isRootNode) {
  					// Update element classes according to node state
  					// this.nodeRenderStatus(ctx);
  					// Finally add the whole structure to the DOM, so the browser can render
  					if (firstTime) {
  						// #486: successorLi is set, if we re-rendered (i.e. discarded)
  						// existing markup, which  we want to insert at the same position.
  						// (null is equivalent to append)
  						// 		parent.ul.appendChild(node.li);
  						parent.ul.insertBefore(node.li, successorLi);
  					}
  				}
  			},
  			/** Create HTML inside the node's outer `<span>` (i.e. expander, checkbox,
  			 * icon, and title).
  			 *
  			 * nodeRenderStatus() is implied.
  			 * @param {EventData} ctx
  			 * @param {string} [title] optinal new title
  			 */
  			nodeRenderTitle: function(ctx, title) {
  				// set node connector images, links and text
  				var checkbox,
  					className,
  					icon,
  					nodeTitle,
  					role,
  					tabindex,
  					tooltip,
  					iconTooltip,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					aria = opts.aria,
  					level = node.getLevel(),
  					ares = [];
  
  				if (title !== undefined) {
  					node.title = title;
  				}
  				if (!node.span || tree._enableUpdate === false) {
  					// Silently bail out if node was not rendered yet, assuming
  					// node.render() will be called as the node becomes visible
  					return;
  				}
  				// Connector (expanded, expandable or simple)
  				role =
  					aria && node.hasChildren() !== false
  						? " role='button'"
  						: "";
  				if (level < opts.minExpandLevel) {
  					if (!node.lazy) {
  						node.expanded = true;
  					}
  					if (level > 1) {
  						ares.push(
  							"<span " +
  								role +
  								" class='fancytree-expander fancytree-expander-fixed'></span>"
  						);
  					}
  					// .. else (i.e. for root level) skip expander/connector alltogether
  				} else {
  					ares.push(
  						"<span " + role + " class='fancytree-expander'></span>"
  					);
  				}
  				// Checkbox mode
  				checkbox = FT.evalOption("checkbox", node, node, opts, false);
  
  				if (checkbox && !node.isStatusNode()) {
  					role = aria ? " role='checkbox'" : "";
  					className = "fancytree-checkbox";
  					if (
  						checkbox === "radio" ||
  						(node.parent && node.parent.radiogroup)
  					) {
  						className += " fancytree-radio";
  					}
  					ares.push(
  						"<span " + role + " class='" + className + "'></span>"
  					);
  				}
  				// Folder or doctype icon
  				if (node.data.iconClass !== undefined) {
  					// 2015-11-16
  					// Handle / warn about backward compatibility
  					if (node.icon) {
  						$.error(
  							"'iconClass' node option is deprecated since v2.14.0: use 'icon' only instead"
  						);
  					} else {
  						node.warn(
  							"'iconClass' node option is deprecated since v2.14.0: use 'icon' instead"
  						);
  						node.icon = node.data.iconClass;
  					}
  				}
  				// If opts.icon is a callback and returns something other than undefined, use that
  				// else if node.icon is a boolean or string, use that
  				// else if opts.icon is a boolean or string, use that
  				// else show standard icon (which may be different for folders or documents)
  				icon = FT.evalOption("icon", node, node, opts, true);
  				// if( typeof icon !== "boolean" ) {
  				// 	// icon is defined, but not true/false: must be a string
  				// 	icon = "" + icon;
  				// }
  				if (icon !== false) {
  					role = aria ? " role='presentation'" : "";
  
  					iconTooltip = FT.evalOption(
  						"iconTooltip",
  						node,
  						node,
  						opts,
  						null
  					);
  					iconTooltip = iconTooltip
  						? " title='" + _escapeTooltip(iconTooltip) + "'"
  						: "";
  
  					if (typeof icon === "string") {
  						if (TEST_IMG.test(icon)) {
  							// node.icon is an image url. Prepend imagePath
  							icon =
  								icon.charAt(0) === "/"
  									? icon
  									: (opts.imagePath || "") + icon;
  							ares.push(
  								"<img src='" +
  									icon +
  									"' class='fancytree-icon'" +
  									iconTooltip +
  									" alt='' />"
  							);
  						} else {
  							ares.push(
  								"<span " +
  									role +
  									" class='fancytree-custom-icon " +
  									icon +
  									"'" +
  									iconTooltip +
  									"></span>"
  							);
  						}
  					} else if (icon.text) {
  						ares.push(
  							"<span " +
  								role +
  								" class='fancytree-custom-icon " +
  								(icon.addClass || "") +
  								"'" +
  								iconTooltip +
  								">" +
  								FT.escapeHtml(icon.text) +
  								"</span>"
  						);
  					} else if (icon.html) {
  						ares.push(
  							"<span " +
  								role +
  								" class='fancytree-custom-icon " +
  								(icon.addClass || "") +
  								"'" +
  								iconTooltip +
  								">" +
  								icon.html +
  								"</span>"
  						);
  					} else {
  						// standard icon: theme css will take care of this
  						ares.push(
  							"<span " +
  								role +
  								" class='fancytree-icon'" +
  								iconTooltip +
  								"></span>"
  						);
  					}
  				}
  				// Node title
  				nodeTitle = "";
  				if (opts.renderTitle) {
  					nodeTitle =
  						opts.renderTitle.call(
  							tree,
  							{ type: "renderTitle" },
  							ctx
  						) || "";
  				}
  				if (!nodeTitle) {
  					tooltip = FT.evalOption("tooltip", node, node, opts, null);
  					if (tooltip === true) {
  						tooltip = node.title;
  					}
  					// if( node.tooltip ) {
  					// 	tooltip = node.tooltip;
  					// } else if ( opts.tooltip ) {
  					// 	tooltip = opts.tooltip === true ? node.title : opts.tooltip.call(tree, node);
  					// }
  					tooltip = tooltip
  						? " title='" + _escapeTooltip(tooltip) + "'"
  						: "";
  					tabindex = opts.titlesTabbable ? " tabindex='0'" : "";
  
  					nodeTitle =
  						"<span class='fancytree-title'" +
  						tooltip +
  						tabindex +
  						">" +
  						(opts.escapeTitles
  							? FT.escapeHtml(node.title)
  							: node.title) +
  						"</span>";
  				}
  				ares.push(nodeTitle);
  				// Note: this will trigger focusout, if node had the focus
  				//$(node.span).html(ares.join("")); // it will cleanup the jQuery data currently associated with SPAN (if any), but it executes more slowly
  				node.span.innerHTML = ares.join("");
  				// Update CSS classes
  				this.nodeRenderStatus(ctx);
  				if (opts.enhanceTitle) {
  					ctx.$title = $(">span.fancytree-title", node.span);
  					nodeTitle =
  						opts.enhanceTitle.call(
  							tree,
  							{ type: "enhanceTitle" },
  							ctx
  						) || "";
  				}
  			},
  			/** Update element classes according to node state.
  			 * @param {EventData} ctx
  			 */
  			nodeRenderStatus: function(ctx) {
  				// Set classes for current status
  				var $ariaElem,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					// 	nodeContainer = node[tree.nodeContainerAttrName],
  					hasChildren = node.hasChildren(),
  					isLastSib = node.isLastSibling(),
  					aria = opts.aria,
  					cn = opts._classNames,
  					cnList = [],
  					statusElem = node[tree.statusClassPropName];
  
  				if (!statusElem || tree._enableUpdate === false) {
  					// if this function is called for an unrendered node, ignore it (will be updated on nect render anyway)
  					return;
  				}
  				if (aria) {
  					$ariaElem = $(node.tr || node.li);
  				}
  				// Build a list of class names that we will add to the node <span>
  				cnList.push(cn.node);
  				if (tree.activeNode === node) {
  					cnList.push(cn.active);
  					// 		$(">span.fancytree-title", statusElem).attr("tabindex", "0");
  					// 		tree.$container.removeAttr("tabindex");
  					// }else{
  					// 		$(">span.fancytree-title", statusElem).removeAttr("tabindex");
  					// 		tree.$container.attr("tabindex", "0");
  				}
  				if (tree.focusNode === node) {
  					cnList.push(cn.focused);
  				}
  				if (node.expanded) {
  					cnList.push(cn.expanded);
  				}
  				if (aria) {
  					if (hasChildren === false) {
  						$ariaElem.removeAttr("aria-expanded");
  					} else {
  						$ariaElem.attr("aria-expanded", Boolean(node.expanded));
  					}
  				}
  				if (node.folder) {
  					cnList.push(cn.folder);
  				}
  				if (hasChildren !== false) {
  					cnList.push(cn.hasChildren);
  				}
  				// TODO: required?
  				if (isLastSib) {
  					cnList.push(cn.lastsib);
  				}
  				if (node.lazy && node.children == null) {
  					cnList.push(cn.lazy);
  				}
  				if (node.partload) {
  					cnList.push(cn.partload);
  				}
  				if (node.partsel) {
  					cnList.push(cn.partsel);
  				}
  				if (FT.evalOption("unselectable", node, node, opts, false)) {
  					cnList.push(cn.unselectable);
  				}
  				if (node._isLoading) {
  					cnList.push(cn.loading);
  				}
  				if (node._error) {
  					cnList.push(cn.error);
  				}
  				if (node.statusNodeType) {
  					cnList.push(cn.statusNodePrefix + node.statusNodeType);
  				}
  				if (node.selected) {
  					cnList.push(cn.selected);
  					if (aria) {
  						$ariaElem.attr("aria-selected", true);
  					}
  				} else if (aria) {
  					$ariaElem.attr("aria-selected", false);
  				}
  				if (node.extraClasses) {
  					cnList.push(node.extraClasses);
  				}
  				// IE6 doesn't correctly evaluate multiple class names,
  				// so we create combined class names that can be used in the CSS
  				if (hasChildren === false) {
  					cnList.push(
  						cn.combinedExpanderPrefix + "n" + (isLastSib ? "l" : "")
  					);
  				} else {
  					cnList.push(
  						cn.combinedExpanderPrefix +
  							(node.expanded ? "e" : "c") +
  							(node.lazy && node.children == null ? "d" : "") +
  							(isLastSib ? "l" : "")
  					);
  				}
  				cnList.push(
  					cn.combinedIconPrefix +
  						(node.expanded ? "e" : "c") +
  						(node.folder ? "f" : "")
  				);
  				// node.span.className = cnList.join(" ");
  				statusElem.className = cnList.join(" ");
  
  				// TODO: we should not set this in the <span> tag also, if we set it here:
  				// Maybe most (all) of the classes should be set in LI instead of SPAN?
  				if (node.li) {
  					// #719: we have to consider that there may be already other classes:
  					$(node.li).toggleClass(cn.lastsib, isLastSib);
  				}
  			},
  			/** Activate node.
  			 * flag defaults to true.
  			 * If flag is true, the node is activated (must be a synchronous operation)
  			 * If flag is false, the node is deactivated (must be a synchronous operation)
  			 * @param {EventData} ctx
  			 * @param {boolean} [flag=true]
  			 * @param {object} [opts] additional options. Defaults to {noEvents: false, noFocus: false}
  			 * @returns {$.Promise}
  			 */
  			nodeSetActive: function(ctx, flag, callOpts) {
  				// Handle user click / [space] / [enter], according to clickFolderMode.
  				callOpts = callOpts || {};
  				var subCtx,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					noEvents = callOpts.noEvents === true,
  					noFocus = callOpts.noFocus === true,
  					scroll = callOpts.scrollIntoView !== false,
  					isActive = node === tree.activeNode;
  
  				// flag defaults to true
  				flag = flag !== false;
  				// node.debug("nodeSetActive", flag);
  
  				if (isActive === flag) {
  					// Nothing to do
  					return _getResolvedPromise(node);
  				} else if (
  					flag &&
  					!noEvents &&
  					this._triggerNodeEvent(
  						"beforeActivate",
  						node,
  						ctx.originalEvent
  					) === false
  				) {
  					// Callback returned false
  					return _getRejectedPromise(node, ["rejected"]);
  				}
  				if (flag) {
  					if (tree.activeNode) {
  						_assert(
  							tree.activeNode !== node,
  							"node was active (inconsistency)"
  						);
  						subCtx = $.extend({}, ctx, { node: tree.activeNode });
  						tree.nodeSetActive(subCtx, false);
  						_assert(
  							tree.activeNode === null,
  							"deactivate was out of sync?"
  						);
  					}
  
  					if (opts.activeVisible) {
  						// If no focus is set (noFocus: true) and there is no focused node, this node is made visible.
  						// scroll = noFocus && tree.focusNode == null;
  						// #863: scroll by default (unless `scrollIntoView: false` was passed)
  						node.makeVisible({ scrollIntoView: scroll });
  					}
  					tree.activeNode = node;
  					tree.nodeRenderStatus(ctx);
  					if (!noFocus) {
  						tree.nodeSetFocus(ctx);
  					}
  					if (!noEvents) {
  						tree._triggerNodeEvent(
  							"activate",
  							node,
  							ctx.originalEvent
  						);
  					}
  				} else {
  					_assert(
  						tree.activeNode === node,
  						"node was not active (inconsistency)"
  					);
  					tree.activeNode = null;
  					this.nodeRenderStatus(ctx);
  					if (!noEvents) {
  						ctx.tree._triggerNodeEvent(
  							"deactivate",
  							node,
  							ctx.originalEvent
  						);
  					}
  				}
  				return _getResolvedPromise(node);
  			},
  			/** Expand or collapse node, return Deferred.promise.
  			 *
  			 * @param {EventData} ctx
  			 * @param {boolean} [flag=true]
  			 * @param {object} [opts] additional options. Defaults to `{noAnimation: false, noEvents: false}`
  			 * @returns {$.Promise} The deferred will be resolved as soon as the (lazy)
  			 *     data was retrieved, rendered, and the expand animation finished.
  			 */
  			nodeSetExpanded: function(ctx, flag, callOpts) {
  				callOpts = callOpts || {};
  				var _afterLoad,
  					dfd,
  					i,
  					l,
  					parents,
  					prevAC,
  					node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					noAnimation = callOpts.noAnimation === true,
  					noEvents = callOpts.noEvents === true;
  
  				// flag defaults to true
  				flag = flag !== false;
  
  				// node.debug("nodeSetExpanded(" + flag + ")");
  
  				if ($(node.li).hasClass(opts._classNames.animating)) {
  					node.warn(
  						"setExpanded(" + flag + ") while animating: ignored."
  					);
  					return _getRejectedPromise(node, ["recursion"]);
  				}
  
  				if ((node.expanded && flag) || (!node.expanded && !flag)) {
  					// Nothing to do
  					// node.debug("nodeSetExpanded(" + flag + "): nothing to do");
  					return _getResolvedPromise(node);
  				} else if (flag && !node.lazy && !node.hasChildren()) {
  					// Prevent expanding of empty nodes
  					// return _getRejectedPromise(node, ["empty"]);
  					return _getResolvedPromise(node);
  				} else if (!flag && node.getLevel() < opts.minExpandLevel) {
  					// Prevent collapsing locked levels
  					return _getRejectedPromise(node, ["locked"]);
  				} else if (
  					!noEvents &&
  					this._triggerNodeEvent(
  						"beforeExpand",
  						node,
  						ctx.originalEvent
  					) === false
  				) {
  					// Callback returned false
  					return _getRejectedPromise(node, ["rejected"]);
  				}
  				// If this node inside a collpased node, no animation and scrolling is needed
  				if (!noAnimation && !node.isVisible()) {
  					noAnimation = callOpts.noAnimation = true;
  				}
  
  				dfd = new $.Deferred();
  
  				// Auto-collapse mode: collapse all siblings
  				if (flag && !node.expanded && opts.autoCollapse) {
  					parents = node.getParentList(false, true);
  					prevAC = opts.autoCollapse;
  					try {
  						opts.autoCollapse = false;
  						for (i = 0, l = parents.length; i < l; i++) {
  							// TODO: should return promise?
  							this._callHook(
  								"nodeCollapseSiblings",
  								parents[i],
  								callOpts
  							);
  						}
  					} finally {
  						opts.autoCollapse = prevAC;
  					}
  				}
  				// Trigger expand/collapse after expanding
  				dfd.done(function() {
  					var lastChild = node.getLastChild();
  
  					if (
  						flag &&
  						opts.autoScroll &&
  						!noAnimation &&
  						lastChild &&
  						tree._enableUpdate
  					) {
  						// Scroll down to last child, but keep current node visible
  						lastChild
  							.scrollIntoView(true, { topNode: node })
  							.always(function() {
  								if (!noEvents) {
  									ctx.tree._triggerNodeEvent(
  										flag ? "expand" : "collapse",
  										ctx
  									);
  								}
  							});
  					} else {
  						if (!noEvents) {
  							ctx.tree._triggerNodeEvent(
  								flag ? "expand" : "collapse",
  								ctx
  							);
  						}
  					}
  				});
  				// vvv Code below is executed after loading finished:
  				_afterLoad = function(callback) {
  					var cn = opts._classNames,
  						isVisible,
  						isExpanded,
  						effect = opts.toggleEffect;
  
  					node.expanded = flag;
  					tree._callHook(
  						"treeStructureChanged",
  						ctx,
  						flag ? "expand" : "collapse"
  					);
  					// Create required markup, but make sure the top UL is hidden, so we
  					// can animate later
  					tree._callHook("nodeRender", ctx, false, false, true);
  
  					// Hide children, if node is collapsed
  					if (node.ul) {
  						isVisible = node.ul.style.display !== "none";
  						isExpanded = !!node.expanded;
  						if (isVisible === isExpanded) {
  							node.warn(
  								"nodeSetExpanded: UL.style.display already set"
  							);
  						} else if (!effect || noAnimation) {
  							node.ul.style.display =
  								node.expanded || !parent ? "" : "none";
  						} else {
  							// The UI toggle() effect works with the ext-wide extension,
  							// while jQuery.animate() has problems when the title span
  							// has position: absolute.
  							// Since jQuery UI 1.12, the blind effect requires the parent
  							// element to have 'position: relative'.
  							// See #716, #717
  							$(node.li).addClass(cn.animating); // #717
  
  							if ($.isFunction($(node.ul)[effect.effect])) {
  								// tree.debug( "use jquery." + effect.effect + " method" );
  								$(node.ul)[effect.effect]({
  									duration: effect.duration,
  									always: function() {
  										// node.debug("fancytree-animating end: " + node.li.className);
  										$(this).removeClass(cn.animating); // #716
  										$(node.li).removeClass(cn.animating); // #717
  										callback();
  									},
  								});
  							} else {
  								// The UI toggle() effect works with the ext-wide extension,
  								// while jQuery.animate() has problems when the title span
  								// has positon: absolute.
  								// Since jQuery UI 1.12, the blind effect requires the parent
  								// element to have 'position: relative'.
  								// See #716, #717
  								// tree.debug("use specified effect (" + effect.effect + ") with the jqueryui.toggle method");
  
  								// try to stop an animation that might be already in progress
  								$(node.ul).stop(true, true); //< does not work after resetLazy has been called for a node whose animation wasn't complete and effect was "blind"
  
  								// dirty fix to remove a defunct animation (effect: "blind") after resetLazy has been called
  								$(node.ul)
  									.parent()
  									.find(".ui-effects-placeholder")
  									.remove();
  
  								$(node.ul).toggle(
  									effect.effect,
  									effect.options,
  									effect.duration,
  									function() {
  										// node.debug("fancytree-animating end: " + node.li.className);
  										$(this).removeClass(cn.animating); // #716
  										$(node.li).removeClass(cn.animating); // #717
  										callback();
  									}
  								);
  							}
  							return;
  						}
  					}
  					callback();
  				};
  				// ^^^ Code above is executed after loading finshed.
  
  				// Load lazy nodes, if any. Then continue with _afterLoad()
  				if (flag && node.lazy && node.hasChildren() === undefined) {
  					// node.debug("nodeSetExpanded: load start...");
  					node.load()
  						.done(function() {
  							// node.debug("nodeSetExpanded: load done");
  							if (dfd.notifyWith) {
  								// requires jQuery 1.6+
  								dfd.notifyWith(node, ["loaded"]);
  							}
  							_afterLoad(function() {
  								dfd.resolveWith(node);
  							});
  						})
  						.fail(function(errMsg) {
  							_afterLoad(function() {
  								dfd.rejectWith(node, [
  									"load failed (" + errMsg + ")",
  								]);
  							});
  						});
  					/*
  					var source = tree._triggerNodeEvent("lazyLoad", node, ctx.originalEvent);
  					_assert(typeof source !== "boolean", "lazyLoad event must return source in data.result");
  					node.debug("nodeSetExpanded: load start...");
  					this._callHook("nodeLoadChildren", ctx, source).done(function(){
  						node.debug("nodeSetExpanded: load done");
  						if(dfd.notifyWith){ // requires jQuery 1.6+
  							dfd.notifyWith(node, ["loaded"]);
  						}
  						_afterLoad.call(tree);
  					}).fail(function(errMsg){
  						dfd.rejectWith(node, ["load failed (" + errMsg + ")"]);
  					});
  					*/
  				} else {
  					_afterLoad(function() {
  						dfd.resolveWith(node);
  					});
  				}
  				// node.debug("nodeSetExpanded: returns");
  				return dfd.promise();
  			},
  			/** Focus or blur this node.
  			 * @param {EventData} ctx
  			 * @param {boolean} [flag=true]
  			 */
  			nodeSetFocus: function(ctx, flag) {
  				// ctx.node.debug("nodeSetFocus(" + flag + ")");
  				var ctx2,
  					tree = ctx.tree,
  					node = ctx.node,
  					opts = tree.options,
  					// et = ctx.originalEvent && ctx.originalEvent.type,
  					isInput = ctx.originalEvent
  						? $(ctx.originalEvent.target).is(":input")
  						: false;
  
  				flag = flag !== false;
  
  				// (node || tree).debug("nodeSetFocus(" + flag + "), event: " + et + ", isInput: "+ isInput);
  				// Blur previous node if any
  				if (tree.focusNode) {
  					if (tree.focusNode === node && flag) {
  						// node.debug("nodeSetFocus(" + flag + "): nothing to do");
  						return;
  					}
  					ctx2 = $.extend({}, ctx, { node: tree.focusNode });
  					tree.focusNode = null;
  					this._triggerNodeEvent("blur", ctx2);
  					this._callHook("nodeRenderStatus", ctx2);
  				}
  				// Set focus to container and node
  				if (flag) {
  					if (!this.hasFocus()) {
  						node.debug("nodeSetFocus: forcing container focus");
  						this._callHook("treeSetFocus", ctx, true, {
  							calledByNode: true,
  						});
  					}
  					node.makeVisible({ scrollIntoView: false });
  					tree.focusNode = node;
  					if (opts.titlesTabbable) {
  						if (!isInput) {
  							// #621
  							$(node.span)
  								.find(".fancytree-title")
  								.focus();
  						}
  					}
  					if (opts.aria) {
  						// Set active descendant to node's span ID (create one, if needed)
  						$(tree.$container).attr(
  							"aria-activedescendant",
  							$(node.tr || node.li)
  								.uniqueId()
  								.attr("id")
  						);
  						// "ftal_" + opts.idPrefix + node.key);
  					}
  					// $(node.span).find(".fancytree-title").focus();
  					this._triggerNodeEvent("focus", ctx);
  
  					// determine if we have focus on or inside tree container
  					var hasFancytreeFocus =
  						document.activeElement === tree.$container.get(0) ||
  						$(document.activeElement, tree.$container).length >= 1;
  
  					if (!hasFancytreeFocus) {
  						// We cannot set KB focus to a node, so use the tree container
  						// #563, #570: IE scrolls on every call to .focus(), if the container
  						// is partially outside the viewport. So do it only, when absolutely
  						// necessary.
  						$(tree.$container).focus();
  					}
  
  					// if( opts.autoActivate ){
  					// 	tree.nodeSetActive(ctx, true);
  					// }
  					if (opts.autoScroll) {
  						node.scrollIntoView();
  					}
  					this._callHook("nodeRenderStatus", ctx);
  				}
  			},
  			/** (De)Select node, return new status (sync).
  			 *
  			 * @param {EventData} ctx
  			 * @param {boolean} [flag=true]
  			 * @param {object} [opts] additional options. Defaults to {noEvents: false,
  			 *     propagateDown: null, propagateUp: null,
  			 *     callback: null,
  			 *     }
  			 * @returns {boolean} previous status
  			 */
  			nodeSetSelected: function(ctx, flag, callOpts) {
  				callOpts = callOpts || {};
  				var node = ctx.node,
  					tree = ctx.tree,
  					opts = ctx.options,
  					noEvents = callOpts.noEvents === true,
  					parent = node.parent;
  
  				// flag defaults to true
  				flag = flag !== false;
  
  				// node.debug("nodeSetSelected(" + flag + ")", ctx);
  
  				// Cannot (de)select unselectable nodes directly (only by propagation or
  				// by setting the `.selected` property)
  				if (FT.evalOption("unselectable", node, node, opts, false)) {
  					return;
  				}
  
  				// Remember the user's intent, in case down -> up propagation prevents
  				// applying it to node.selected
  				node._lastSelectIntent = flag; // Confusing use of '!'
  
  				// Nothing to do?
  				if (!!node.selected === flag) {
  					if (opts.selectMode === 3 && node.partsel && !flag) {
  						// If propagation prevented selecting this node last time, we still
  						// want to allow to apply setSelected(false) now
  					} else {
  						return flag;
  					}
  				}
  
  				if (
  					!noEvents &&
  					this._triggerNodeEvent(
  						"beforeSelect",
  						node,
  						ctx.originalEvent
  					) === false
  				) {
  					return !!node.selected;
  				}
  				if (flag && opts.selectMode === 1) {
  					// single selection mode (we don't uncheck all tree nodes, for performance reasons)
  					if (tree.lastSelectedNode) {
  						tree.lastSelectedNode.setSelected(false);
  					}
  					node.selected = flag;
  				} else if (
  					opts.selectMode === 3 &&
  					parent &&
  					!parent.radiogroup &&
  					!node.radiogroup
  				) {
  					// multi-hierarchical selection mode
  					node.selected = flag;
  					node.fixSelection3AfterClick(callOpts);
  				} else if (parent && parent.radiogroup) {
  					node.visitSiblings(function(n) {
  						n._changeSelectStatusAttrs(flag && n === node);
  					}, true);
  				} else {
  					// default: selectMode: 2, multi selection mode
  					node.selected = flag;
  				}
  				this.nodeRenderStatus(ctx);
  				tree.lastSelectedNode = flag ? node : null;
  				if (!noEvents) {
  					tree._triggerNodeEvent("select", ctx);
  				}
  			},
  			/** Show node status (ok, loading, error, nodata) using styles and a dummy child node.
  			 *
  			 * @param {EventData} ctx
  			 * @param status
  			 * @param message
  			 * @param details
  			 * @since 2.3
  			 */
  			nodeSetStatus: function(ctx, status, message, details) {
  				var node = ctx.node,
  					tree = ctx.tree;
  
  				function _clearStatusNode() {
  					// Remove dedicated dummy node, if any
  					var firstChild = node.children ? node.children[0] : null;
  					if (firstChild && firstChild.isStatusNode()) {
  						try {
  							// I've seen exceptions here with loadKeyPath...
  							if (node.ul) {
  								node.ul.removeChild(firstChild.li);
  								firstChild.li = null; // avoid leaks (DT issue 215)
  							}
  						} catch (e) {}
  						if (node.children.length === 1) {
  							node.children = [];
  						} else {
  							node.children.shift();
  						}
  						tree._callHook(
  							"treeStructureChanged",
  							ctx,
  							"clearStatusNode"
  						);
  					}
  				}
  				function _setStatusNode(data, type) {
  					// Create/modify the dedicated dummy node for 'loading...' or
  					// 'error!' status. (only called for direct child of the invisible
  					// system root)
  					var firstChild = node.children ? node.children[0] : null;
  					if (firstChild && firstChild.isStatusNode()) {
  						$.extend(firstChild, data);
  						firstChild.statusNodeType = type;
  						tree._callHook("nodeRenderTitle", firstChild);
  					} else {
  						node._setChildren([data]);
  						tree._callHook(
  							"treeStructureChanged",
  							ctx,
  							"setStatusNode"
  						);
  						node.children[0].statusNodeType = type;
  						tree.render();
  					}
  					return node.children[0];
  				}
  
  				switch (status) {
  					case "ok":
  						_clearStatusNode();
  						node._isLoading = false;
  						node._error = null;
  						node.renderStatus();
  						break;
  					case "loading":
  						if (!node.parent) {
  							_setStatusNode(
  								{
  									title:
  										tree.options.strings.loading +
  										(message ? " (" + message + ")" : ""),
  									// icon: true,  // needed for 'loding' icon
  									checkbox: false,
  									tooltip: details,
  								},
  								status
  							);
  						}
  						node._isLoading = true;
  						node._error = null;
  						node.renderStatus();
  						break;
  					case "error":
  						_setStatusNode(
  							{
  								title:
  									tree.options.strings.loadError +
  									(message ? " (" + message + ")" : ""),
  								// icon: false,
  								checkbox: false,
  								tooltip: details,
  							},
  							status
  						);
  						node._isLoading = false;
  						node._error = { message: message, details: details };
  						node.renderStatus();
  						break;
  					case "nodata":
  						_setStatusNode(
  							{
  								title: message || tree.options.strings.noData,
  								// icon: false,
  								checkbox: false,
  								tooltip: details,
  							},
  							status
  						);
  						node._isLoading = false;
  						node._error = null;
  						node.renderStatus();
  						break;
  					default:
  						$.error("invalid node status " + status);
  				}
  			},
  			/**
  			 *
  			 * @param {EventData} ctx
  			 */
  			nodeToggleExpanded: function(ctx) {
  				return this.nodeSetExpanded(ctx, !ctx.node.expanded);
  			},
  			/**
  			 * @param {EventData} ctx
  			 */
  			nodeToggleSelected: function(ctx) {
  				var node = ctx.node,
  					flag = !node.selected;
  
  				// In selectMode: 3 this node may be unselected+partsel, even if
  				// setSelected(true) was called before, due to `unselectable` children.
  				// In this case, we now toggle as `setSelected(false)`
  				if (
  					node.partsel &&
  					!node.selected &&
  					node._lastSelectIntent === true
  				) {
  					flag = false;
  					node.selected = true; // so it is not considered 'nothing to do'
  				}
  				node._lastSelectIntent = flag;
  				return this.nodeSetSelected(ctx, flag);
  			},
  			/** Remove all nodes.
  			 * @param {EventData} ctx
  			 */
  			treeClear: function(ctx) {
  				var tree = ctx.tree;
  				tree.activeNode = null;
  				tree.focusNode = null;
  				tree.$div.find(">ul.fancytree-container").empty();
  				// TODO: call destructors and remove reference loops
  				tree.rootNode.children = null;
  				tree._callHook("treeStructureChanged", ctx, "clear");
  			},
  			/** Widget was created (called only once, even it re-initialized).
  			 * @param {EventData} ctx
  			 */
  			treeCreate: function(ctx) {},
  			/** Widget was destroyed.
  			 * @param {EventData} ctx
  			 */
  			treeDestroy: function(ctx) {
  				this.$div.find(">ul.fancytree-container").remove();
  				if (this.$source) {
  					this.$source.removeClass("fancytree-helper-hidden");
  				}
  			},
  			/** Widget was (re-)initialized.
  			 * @param {EventData} ctx
  			 */
  			treeInit: function(ctx) {
  				var tree = ctx.tree,
  					opts = tree.options;
  
  				//this.debug("Fancytree.treeInit()");
  				// Add container to the TAB chain
  				// See http://www.w3.org/TR/wai-aria-practices/#focus_activedescendant
  				// #577: Allow to set tabindex to "0", "-1" and ""
  				tree.$container.attr("tabindex", opts.tabindex);
  
  				// Copy some attributes to tree.data
  				$.each(TREE_ATTRS, function(i, attr) {
  					if (opts[attr] !== undefined) {
  						tree.info("Move option " + attr + " to tree");
  						tree[attr] = opts[attr];
  						delete opts[attr];
  					}
  				});
  
  				if (opts.checkboxAutoHide) {
  					tree.$container.addClass("fancytree-checkbox-auto-hide");
  				}
  				if (opts.rtl) {
  					tree.$container
  						.attr("DIR", "RTL")
  						.addClass("fancytree-rtl");
  				} else {
  					tree.$container
  						.removeAttr("DIR")
  						.removeClass("fancytree-rtl");
  				}
  				if (opts.aria) {
  					tree.$container.attr("role", "tree");
  					if (opts.selectMode !== 1) {
  						tree.$container.attr("aria-multiselectable", true);
  					}
  				}
  				this.treeLoad(ctx);
  			},
  			/** Parse Fancytree from source, as configured in the options.
  			 * @param {EventData} ctx
  			 * @param {object} [source] optional new source (use last data otherwise)
  			 */
  			treeLoad: function(ctx, source) {
  				var metaData,
  					type,
  					$ul,
  					tree = ctx.tree,
  					$container = ctx.widget.element,
  					dfd,
  					// calling context for root node
  					rootCtx = $.extend({}, ctx, { node: this.rootNode });
  
  				if (tree.rootNode.children) {
  					this.treeClear(ctx);
  				}
  				source = source || this.options.source;
  
  				if (!source) {
  					type = $container.data("type") || "html";
  					switch (type) {
  						case "html":
  							// There should be an embedded `<ul>` with initial nodes,
  							// but another `<ul class='fancytree-container'>` is appended
  							// to the tree's <div> on startup anyway.
  							$ul = $container
  								.find(">ul")
  								.not(".fancytree-container")
  								.first();
  
  							if ($ul.length) {
  								$ul.addClass(
  									"ui-fancytree-source fancytree-helper-hidden"
  								);
  								source = $.ui.fancytree.parseHtml($ul);
  								// allow to init tree.data.foo from <ul data-foo=''>
  								this.data = $.extend(
  									this.data,
  									_getElementDataAsDict($ul)
  								);
  							} else {
  								FT.warn(
  									"No `source` option was passed and container does not contain `<ul>`: assuming `source: []`."
  								);
  								source = [];
  							}
  							break;
  						case "json":
  							source = $.parseJSON($container.text());
  							// $container already contains the <ul>, but we remove the plain (json) text
  							// $container.empty();
  							$container
  								.contents()
  								.filter(function() {
  									return this.nodeType === 3;
  								})
  								.remove();
  							if ($.isPlainObject(source)) {
  								// We got {foo: 'abc', children: [...]}
  								_assert(
  									$.isArray(source.children),
  									"if an object is passed as source, it must contain a 'children' array (all other properties are added to 'tree.data')"
  								);
  								metaData = source;
  								source = source.children;
  								delete metaData.children;
  								// Copy some attributes to tree.data
  								$.each(TREE_ATTRS, function(i, attr) {
  									if (metaData[attr] !== undefined) {
  										tree[attr] = metaData[attr];
  										delete metaData[attr];
  									}
  								});
  								// Copy extra properties to tree.data.foo
  								$.extend(tree.data, metaData);
  							}
  							break;
  						default:
  							$.error("Invalid data-type: " + type);
  					}
  				} else if (typeof source === "string") {
  					// TODO: source is an element ID
  					$.error("Not implemented");
  				}
  
  				// preInit is fired when the widget markup is created, but nodes
  				// not yet loaded
  				tree._triggerTreeEvent("preInit", null);
  
  				// Trigger fancytreeinit after nodes have been loaded
  				dfd = this.nodeLoadChildren(rootCtx, source)
  					.done(function() {
  						tree._callHook(
  							"treeStructureChanged",
  							ctx,
  							"loadChildren"
  						);
  						tree.render();
  						if (ctx.options.selectMode === 3) {
  							tree.rootNode.fixSelection3FromEndNodes();
  						}
  						if (tree.activeNode && tree.options.activeVisible) {
  							tree.activeNode.makeVisible();
  						}
  						tree._triggerTreeEvent("init", null, { status: true });
  					})
  					.fail(function() {
  						tree.render();
  						tree._triggerTreeEvent("init", null, { status: false });
  					});
  				return dfd;
  			},
  			/** Node was inserted into or removed from the tree.
  			 * @param {EventData} ctx
  			 * @param {boolean} add
  			 * @param {FancytreeNode} node
  			 */
  			treeRegisterNode: function(ctx, add, node) {
  				ctx.tree._callHook(
  					"treeStructureChanged",
  					ctx,
  					add ? "addNode" : "removeNode"
  				);
  			},
  			/** Widget got focus.
  			 * @param {EventData} ctx
  			 * @param {boolean} [flag=true]
  			 */
  			treeSetFocus: function(ctx, flag, callOpts) {
  				var targetNode;
  
  				flag = flag !== false;
  
  				// this.debug("treeSetFocus(" + flag + "), callOpts: ", callOpts, this.hasFocus());
  				// this.debug("    focusNode: " + this.focusNode);
  				// this.debug("    activeNode: " + this.activeNode);
  				if (flag !== this.hasFocus()) {
  					this._hasFocus = flag;
  					if (!flag && this.focusNode) {
  						// Node also looses focus if widget blurs
  						this.focusNode.setFocus(false);
  					} else if (flag && (!callOpts || !callOpts.calledByNode)) {
  						$(this.$container).focus();
  					}
  					this.$container.toggleClass("fancytree-treefocus", flag);
  					this._triggerTreeEvent(flag ? "focusTree" : "blurTree");
  					if (flag && !this.activeNode) {
  						// #712: Use last mousedowned node ('click' event fires after focusin)
  						targetNode =
  							this._lastMousedownNode || this.getFirstChild();
  						if (targetNode) {
  							targetNode.setFocus();
  						}
  					}
  				}
  			},
  			/** Widget option was set using `$().fancytree("option", "KEY", VALUE)`.
  			 *
  			 * Note: `key` may reference a nested option, e.g. 'dnd5.scroll'.
  			 * In this case `value`contains the complete, modified `dnd5` option hash.
  			 * We can check for changed values like
  			 *     if( value.scroll !== tree.options.dnd5.scroll ) {...}
  			 *
  			 * @param {EventData} ctx
  			 * @param {string} key option name
  			 * @param {any} value option value
  			 */
  			treeSetOption: function(ctx, key, value) {
  				var tree = ctx.tree,
  					callDefault = true,
  					callCreate = false,
  					callRender = false;
  
  				switch (key) {
  					case "aria":
  					case "checkbox":
  					case "icon":
  					case "minExpandLevel":
  					case "tabindex":
  						// tree._callHook("treeCreate", tree);
  						callCreate = true;
  						callRender = true;
  						break;
  					case "checkboxAutoHide":
  						tree.$container.toggleClass(
  							"fancytree-checkbox-auto-hide",
  							!!value
  						);
  						break;
  					case "escapeTitles":
  					case "tooltip":
  						callRender = true;
  						break;
  					case "rtl":
  						if (value === false) {
  							tree.$container
  								.removeAttr("DIR")
  								.removeClass("fancytree-rtl");
  						} else {
  							tree.$container
  								.attr("DIR", "RTL")
  								.addClass("fancytree-rtl");
  						}
  						callRender = true;
  						break;
  					case "source":
  						callDefault = false;
  						tree._callHook("treeLoad", tree, value);
  						callRender = true;
  						break;
  				}
  				tree.debug(
  					"set option " +
  						key +
  						"=" +
  						value +
  						" <" +
  						typeof value +
  						">"
  				);
  				if (callDefault) {
  					if (this.widget._super) {
  						// jQuery UI 1.9+
  						this.widget._super.call(this.widget, key, value);
  					} else {
  						// jQuery UI <= 1.8, we have to manually invoke the _setOption method from the base widget
  						$.Widget.prototype._setOption.call(
  							this.widget,
  							key,
  							value
  						);
  					}
  				}
  				if (callCreate) {
  					tree._callHook("treeCreate", tree);
  				}
  				if (callRender) {
  					tree.render(true, false); // force, not-deep
  				}
  			},
  			/** A Node was added, removed, moved, or it's visibility changed.
  			 * @param {EventData} ctx
  			 */
  			treeStructureChanged: function(ctx, type) {},
  		}
  	);
  
  	/*******************************************************************************
  	 * jQuery UI widget boilerplate
  	 */
  
  	/**
  	 * The plugin (derrived from [jQuery.Widget](http://api.jqueryui.com/jQuery.widget/)).
  	 *
  	 * **Note:**
  	 * These methods implement the standard jQuery UI widget API.
  	 * It is recommended to use methods of the {Fancytree} instance instead
  	 *
  	 * @example
  	 * // DEPRECATED: Access jQuery UI widget methods and members:
  	 * var tree = $("#tree").fancytree("getTree", "#myTree");
  	 * var node = $.ui.fancytree.getTree("#tree").getActiveNode();
  	 *
  	 * // RECOMMENDED: Use the Fancytree object API
  	 * var tree = $.ui.fancytree.getTree("#myTree");
  	 * var node = tree.getActiveNode();
  	 *
  	 * // or you may already have stored the tree instance upon creation:
  	 * import {createTree, version} from 'jquery.fancytree'
  	 * const tree = createTree('#tree', { ... });
  	 * var node = tree.getActiveNode();
  	 *
  	 * @see {Fancytree_Static#getTree}
  	 * @deprecated Use methods of the {Fancytree} instance instead
  	 * @mixin Fancytree_Widget
  	 */
  
  	$.widget(
  		"ui.fancytree",
  		/** @lends Fancytree_Widget# */
  		{
  			/**These options will be used as defaults
  			 * @type {FancytreeOptions}
  			 */
  			options: {
  				activeVisible: true,
  				ajax: {
  					type: "GET",
  					cache: false, // false: Append random '_' argument to the request url to prevent caching.
  					// timeout: 0, // >0: Make sure we get an ajax error if server is unreachable
  					dataType: "json", // Expect json format and pass json object to callbacks.
  				},
  				aria: true,
  				autoActivate: true,
  				autoCollapse: false,
  				autoScroll: false,
  				checkbox: false,
  				clickFolderMode: 4,
  				copyFunctionsToData: false,
  				debugLevel: null, // 0..4 (null: use global setting $.ui.fancytree.debugLevel)
  				disabled: false, // TODO: required anymore?
  				enableAspx: 42, // TODO: this is truethy, but distinguishable from true: default will change to false in the future
  				escapeTitles: false,
  				extensions: [],
  				focusOnSelect: false,
  				generateIds: false,
  				icon: true,
  				idPrefix: "ft_",
  				keyboard: true,
  				keyPathSeparator: "/",
  				minExpandLevel: 1,
  				nodata: true, // (bool, string, or callback) display message, when no data available
  				quicksearch: false,
  				rtl: false,
  				scrollOfs: { top: 0, bottom: 0 },
  				scrollParent: null,
  				selectMode: 2,
  				strings: {
  					loading: "Loading...", // &#8230; would be escaped when escapeTitles is true
  					loadError: "Load error!",
  					moreData: "More...",
  					noData: "No data.",
  				},
  				tabindex: "0",
  				titlesTabbable: false,
  				toggleEffect: { effect: "slideToggle", duration: 200 }, //< "toggle" or "slideToggle" to use jQuery instead of jQueryUI for toggleEffect animation
  				tooltip: false,
  				treeId: null,
  				_classNames: {
  					active: "fancytree-active",
  					animating: "fancytree-animating",
  					combinedExpanderPrefix: "fancytree-exp-",
  					combinedIconPrefix: "fancytree-ico-",
  					error: "fancytree-error",
  					expanded: "fancytree-expanded",
  					focused: "fancytree-focused",
  					folder: "fancytree-folder",
  					hasChildren: "fancytree-has-children",
  					lastsib: "fancytree-lastsib",
  					lazy: "fancytree-lazy",
  					loading: "fancytree-loading",
  					node: "fancytree-node",
  					partload: "fancytree-partload",
  					partsel: "fancytree-partsel",
  					radio: "fancytree-radio",
  					selected: "fancytree-selected",
  					statusNodePrefix: "fancytree-statusnode-",
  					unselectable: "fancytree-unselectable",
  				},
  				// events
  				lazyLoad: null,
  				postProcess: null,
  			},
  			_deprecationWarning: function(name) {
  				var tree = this.tree;
  
  				if (tree && tree.options.debugLevel >= 3) {
  					tree.warn(
  						"$().fancytree('" +
  							name +
  							"') is deprecated (see https://wwwendt.de/tech/fancytree/doc/jsdoc/Fancytree_Widget.html"
  					);
  				}
  			},
  			/* Set up the widget, Called on first $().fancytree() */
  			_create: function() {
  				this.tree = new Fancytree(this);
  
  				this.$source =
  					this.source || this.element.data("type") === "json"
  						? this.element
  						: this.element.find(">ul").first();
  				// Subclass Fancytree instance with all enabled extensions
  				var extension,
  					extName,
  					i,
  					opts = this.options,
  					extensions = opts.extensions,
  					base = this.tree;
  
  				for (i = 0; i < extensions.length; i++) {
  					extName = extensions[i];
  					extension = $.ui.fancytree._extensions[extName];
  					if (!extension) {
  						$.error(
  							"Could not apply extension '" +
  								extName +
  								"' (it is not registered, did you forget to include it?)"
  						);
  					}
  					// Add extension options as tree.options.EXTENSION
  					// 	_assert(!this.tree.options[extName], "Extension name must not exist as option name: " + extName);
  
  					// console.info("extend " + extName, extension.options, this.tree.options[extName])
  					// issue #876: we want to replace custom array-options, not merge them
  					this.tree.options[extName] = _simpleDeepMerge(
  						{},
  						extension.options,
  						this.tree.options[extName]
  					);
  					// this.tree.options[extName] = $.extend(true, {}, extension.options, this.tree.options[extName]);
  
  					// console.info("extend " + extName + " =>", this.tree.options[extName])
  					// console.info("extend " + extName + " org default =>", extension.options)
  
  					// Add a namespace tree.ext.EXTENSION, to hold instance data
  					_assert(
  						this.tree.ext[extName] === undefined,
  						"Extension name must not exist as Fancytree.ext attribute: '" +
  							extName +
  							"'"
  					);
  					// this.tree[extName] = extension;
  					this.tree.ext[extName] = {};
  					// Subclass Fancytree methods using proxies.
  					_subclassObject(this.tree, base, extension, extName);
  					// current extension becomes base for the next extension
  					base = extension;
  				}
  				//
  				if (opts.icons !== undefined) {
  					// 2015-11-16
  					if (opts.icon === true) {
  						this.tree.warn(
  							"'icons' tree option is deprecated since v2.14.0: use 'icon' instead"
  						);
  						opts.icon = opts.icons;
  					} else {
  						$.error(
  							"'icons' tree option is deprecated since v2.14.0: use 'icon' only instead"
  						);
  					}
  				}
  				if (opts.iconClass !== undefined) {
  					// 2015-11-16
  					if (opts.icon) {
  						$.error(
  							"'iconClass' tree option is deprecated since v2.14.0: use 'icon' only instead"
  						);
  					} else {
  						this.tree.warn(
  							"'iconClass' tree option is deprecated since v2.14.0: use 'icon' instead"
  						);
  						opts.icon = opts.iconClass;
  					}
  				}
  				if (opts.tabbable !== undefined) {
  					// 2016-04-04
  					opts.tabindex = opts.tabbable ? "0" : "-1";
  					this.tree.warn(
  						"'tabbable' tree option is deprecated since v2.17.0: use 'tabindex='" +
  							opts.tabindex +
  							"' instead"
  					);
  				}
  				//
  				this.tree._callHook("treeCreate", this.tree);
  				// Note: 'fancytreecreate' event is fired by widget base class
  				//        this.tree._triggerTreeEvent("create");
  			},
  
  			/* Called on every $().fancytree() */
  			_init: function() {
  				this.tree._callHook("treeInit", this.tree);
  				// TODO: currently we call bind after treeInit, because treeInit
  				// might change tree.$container.
  				// It would be better, to move event binding into hooks altogether
  				this._bind();
  			},
  
  			/* Use the _setOption method to respond to changes to options. */
  			_setOption: function(key, value) {
  				return this.tree._callHook(
  					"treeSetOption",
  					this.tree,
  					key,
  					value
  				);
  			},
  
  			/** Use the destroy method to clean up any modifications your widget has made to the DOM */
  			_destroy: function() {
  				this._unbind();
  				this.tree._callHook("treeDestroy", this.tree);
  				// In jQuery UI 1.8, you must invoke the destroy method from the base widget
  				// $.Widget.prototype.destroy.call(this);
  				// TODO: delete tree and nodes to make garbage collect easier?
  				// TODO: In jQuery UI 1.9 and above, you would define _destroy instead of destroy and not call the base method
  			},
  
  			// -------------------------------------------------------------------------
  
  			/* Remove all event handlers for our namespace */
  			_unbind: function() {
  				var ns = this.tree._ns;
  				this.element.off(ns);
  				this.tree.$container.off(ns);
  				$(document).off(ns);
  			},
  			/* Add mouse and kyboard handlers to the container */
  			_bind: function() {
  				var self = this,
  					opts = this.options,
  					tree = this.tree,
  					ns = tree._ns;
  				// selstartEvent = ( $.support.selectstart ? "selectstart" : "mousedown" )
  
  				// Remove all previuous handlers for this tree
  				this._unbind();
  
  				//alert("keydown" + ns + "foc=" + tree.hasFocus() + tree.$container);
  				// tree.debug("bind events; container: ", tree.$container);
  				tree.$container
  					.on("focusin" + ns + " focusout" + ns, function(event) {
  						var node = FT.getNode(event),
  							flag = event.type === "focusin";
  
  						if (!flag && node && $(event.target).is("a")) {
  							// #764
  							node.debug(
  								"Ignored focusout on embedded <a> element."
  							);
  							return;
  						}
  						// tree.treeOnFocusInOut.call(tree, event);
  						// tree.debug("Tree container got event " + event.type, node, event, FT.getEventTarget(event));
  						if (flag) {
  							if (tree._getExpiringValue("focusin")) {
  								// #789: IE 11 may send duplicate focusin events
  								tree.debug("Ignored double focusin.");
  								return;
  							}
  							tree._setExpiringValue("focusin", true, 50);
  
  							if (!node) {
  								// #789: IE 11 may send focusin before mousdown(?)
  								node = tree._getExpiringValue("mouseDownNode");
  								if (node) {
  									tree.debug(
  										"Reconstruct mouse target for focusin from recent event."
  									);
  								}
  							}
  						}
  						if (node) {
  							// For example clicking into an <input> that is part of a node
  							tree._callHook(
  								"nodeSetFocus",
  								tree._makeHookContext(node, event),
  								flag
  							);
  						} else {
  							if (
  								tree.tbody &&
  								$(event.target).parents(
  									"table.fancytree-container > thead"
  								).length
  							) {
  								// #767: ignore events in the table's header
  								tree.debug(
  									"Ignore focus event outside table body.",
  									event
  								);
  							} else {
  								tree._callHook("treeSetFocus", tree, flag);
  							}
  						}
  					})
  					.on("selectstart" + ns, "span.fancytree-title", function(
  						event
  					) {
  						// prevent mouse-drags to select text ranges
  						// tree.debug("<span title> got event " + event.type);
  						event.preventDefault();
  					})
  					.on("keydown" + ns, function(event) {
  						// TODO: also bind keyup and keypress
  						// tree.debug("got event " + event.type + ", hasFocus:" + tree.hasFocus());
  						// if(opts.disabled || opts.keyboard === false || !tree.hasFocus() ){
  						if (opts.disabled || opts.keyboard === false) {
  							return true;
  						}
  						var res,
  							node = tree.focusNode, // node may be null
  							ctx = tree._makeHookContext(node || tree, event),
  							prevPhase = tree.phase;
  
  						try {
  							tree.phase = "userEvent";
  							// If a 'fancytreekeydown' handler returns false, skip the default
  							// handling (implemented by tree.nodeKeydown()).
  							if (node) {
  								res = tree._triggerNodeEvent(
  									"keydown",
  									node,
  									event
  								);
  							} else {
  								res = tree._triggerTreeEvent("keydown", event);
  							}
  							if (res === "preventNav") {
  								res = true; // prevent keyboard navigation, but don't prevent default handling of embedded input controls
  							} else if (res !== false) {
  								res = tree._callHook("nodeKeydown", ctx);
  							}
  							return res;
  						} finally {
  							tree.phase = prevPhase;
  						}
  					})
  					.on("mousedown" + ns, function(event) {
  						var et = FT.getEventTarget(event);
  						// self.tree.debug("event(" + event.type + "): node: ", et.node);
  						// #712: Store the clicked node, so we can use it when we get a focusin event
  						//       ('click' event fires after focusin)
  						// tree.debug("event(" + event.type + "): node: ", et.node);
  						tree._lastMousedownNode = et ? et.node : null;
  						// #789: Store the node also for a short period, so we can use it
  						// in a *resulting* focusin event
  						tree._setExpiringValue(
  							"mouseDownNode",
  							tree._lastMousedownNode
  						);
  					})
  					.on("click" + ns + " dblclick" + ns, function(event) {
  						if (opts.disabled) {
  							return true;
  						}
  						var ctx,
  							et = FT.getEventTarget(event),
  							node = et.node,
  							tree = self.tree,
  							prevPhase = tree.phase;
  
  						// self.tree.debug("event(" + event.type + "): node: ", node);
  						if (!node) {
  							return true; // Allow bubbling of other events
  						}
  						ctx = tree._makeHookContext(node, event);
  						// self.tree.debug("event(" + event.type + "): node: ", node);
  						try {
  							tree.phase = "userEvent";
  							switch (event.type) {
  								case "click":
  									ctx.targetType = et.type;
  									if (node.isPagingNode()) {
  										return (
  											tree._triggerNodeEvent(
  												"clickPaging",
  												ctx,
  												event
  											) === true
  										);
  									}
  									return tree._triggerNodeEvent(
  										"click",
  										ctx,
  										event
  									) === false
  										? false
  										: tree._callHook("nodeClick", ctx);
  								case "dblclick":
  									ctx.targetType = et.type;
  									return tree._triggerNodeEvent(
  										"dblclick",
  										ctx,
  										event
  									) === false
  										? false
  										: tree._callHook("nodeDblclick", ctx);
  							}
  						} finally {
  							tree.phase = prevPhase;
  						}
  					});
  			},
  			/** Return the active node or null.
  			 * @returns {FancytreeNode}
  			 * @deprecated Use methods of the Fancytree instance instead (<a href="Fancytree_Widget.html">example above</a>).
  			 */
  			getActiveNode: function() {
  				this._deprecationWarning("getActiveNode");
  				return this.tree.activeNode;
  			},
  			/** Return the matching node or null.
  			 * @param {string} key
  			 * @returns {FancytreeNode}
  			 * @deprecated Use methods of the Fancytree instance instead (<a href="Fancytree_Widget.html">example above</a>).
  			 */
  			getNodeByKey: function(key) {
  				this._deprecationWarning("getNodeByKey");
  				return this.tree.getNodeByKey(key);
  			},
  			/** Return the invisible system root node.
  			 * @returns {FancytreeNode}
  			 * @deprecated Use methods of the Fancytree instance instead (<a href="Fancytree_Widget.html">example above</a>).
  			 */
  			getRootNode: function() {
  				this._deprecationWarning("getRootNode");
  				return this.tree.rootNode;
  			},
  			/** Return the current tree instance.
  			 * @returns {Fancytree}
  			 * @deprecated Use `$.ui.fancytree.getTree()` instead (<a href="Fancytree_Widget.html">example above</a>).
  			 */
  			getTree: function() {
  				this._deprecationWarning("getTree");
  				return this.tree;
  			},
  		}
  	);
  
  	// $.ui.fancytree was created by the widget factory. Create a local shortcut:
  	FT = $.ui.fancytree;
  
  	/**
  	 * Static members in the `$.ui.fancytree` namespace.
  	 * This properties and methods can be accessed without instantiating a concrete
  	 * Fancytree instance.
  	 *
  	 * @example
  	 * // Access static members:
  	 * var node = $.ui.fancytree.getNode(element);
  	 * alert($.ui.fancytree.version);
  	 *
  	 * @mixin Fancytree_Static
  	 */
  	$.extend(
  		$.ui.fancytree,
  		/** @lends Fancytree_Static# */
  		{
  			/** Version number `"MAJOR.MINOR.PATCH"`
  			 * @type {string} */
  			version: "@VERSION", // Set to semver by 'grunt release'
  			/** @type {string}
  			 * @description `"production" for release builds` */
  			buildType: "development", // Set to 'production' by 'grunt build'
  			/** @type {int}
  			 * @description 0: silent .. 5: verbose (default: 3 for release builds). */
  			debugLevel: 4, // Set to 3 by 'grunt build'
  			// Used by $.ui.fancytree.debug() and as default for tree.options.debugLevel
  
  			_nextId: 1,
  			_nextNodeKey: 1,
  			_extensions: {},
  			// focusTree: null,
  
  			/** Expose class object as `$.ui.fancytree._FancytreeClass`.
  			 * Useful to extend `$.ui.fancytree._FancytreeClass.prototype`.
  			 * @type {Fancytree}
  			 */
  			_FancytreeClass: Fancytree,
  			/** Expose class object as $.ui.fancytree._FancytreeNodeClass
  			 * Useful to extend `$.ui.fancytree._FancytreeNodeClass.prototype`.
  			 * @type {FancytreeNode}
  			 */
  			_FancytreeNodeClass: FancytreeNode,
  			/* Feature checks to provide backwards compatibility */
  			jquerySupports: {
  				// http://jqueryui.com/upgrade-guide/1.9/#deprecated-offset-option-merged-into-my-and-at
  				positionMyOfs: isVersionAtLeast($.ui.version, 1, 9),
  			},
  			/** Throw an error if condition fails (debug method).
  			 * @param {boolean} cond
  			 * @param {string} msg
  			 */
  			assert: function(cond, msg) {
  				return _assert(cond, msg);
  			},
  			/** Create a new Fancytree instance on a target element.
  			 *
  			 * @param {Element | jQueryObject | string} el Target DOM element or selector
  			 * @param {FancytreeOptions} [opts] Fancytree options
  			 * @returns {Fancytree} new tree instance
  			 * @example
  			 * var tree = $.ui.fancytree.createTree("#tree", {
  			 *     source: {url: "my/webservice"}
  			 * }); // Create tree for this matching element
  			 *
  			 * @since 2.25
  			 */
  			createTree: function(el, opts) {
  				var $tree = $(el).fancytree(opts);
  				return FT.getTree($tree);
  			},
  			/** Return a function that executes *fn* at most every *timeout* ms.
  			 * @param {integer} timeout
  			 * @param {function} fn
  			 * @param {boolean} [invokeAsap=false]
  			 * @param {any} [ctx]
  			 */
  			debounce: function(timeout, fn, invokeAsap, ctx) {
  				var timer;
  				if (arguments.length === 3 && typeof invokeAsap !== "boolean") {
  					ctx = invokeAsap;
  					invokeAsap = false;
  				}
  				return function() {
  					var args = arguments;
  					ctx = ctx || this;
  					// eslint-disable-next-line no-unused-expressions
  					invokeAsap && !timer && fn.apply(ctx, args);
  					clearTimeout(timer);
  					timer = setTimeout(function() {
  						// eslint-disable-next-line no-unused-expressions
  						invokeAsap || fn.apply(ctx, args);
  						timer = null;
  					}, timeout);
  				};
  			},
  			/** Write message to console if debugLevel >= 4
  			 * @param {string} msg
  			 */
  			debug: function(msg) {
  				if ($.ui.fancytree.debugLevel >= 4) {
  					consoleApply("log", arguments);
  				}
  			},
  			/** Write error message to console if debugLevel >= 1.
  			 * @param {string} msg
  			 */
  			error: function(msg) {
  				if ($.ui.fancytree.debugLevel >= 1) {
  					consoleApply("error", arguments);
  				}
  			},
  			/** Convert `<`, `>`, `&`, `"`, `'`, and `/` to the equivalent entities.
  			 *
  			 * @param {string} s
  			 * @returns {string}
  			 */
  			escapeHtml: function(s) {
  				return ("" + s).replace(REX_HTML, function(s) {
  					return ENTITY_MAP[s];
  				});
  			},
  			/** Make jQuery.position() arguments backwards compatible, i.e. if
  			 * jQuery UI version <= 1.8, convert
  			 *   { my: "left+3 center", at: "left bottom", of: $target }
  			 * to
  			 *   { my: "left center", at: "left bottom", of: $target, offset: "3  0" }
  			 *
  			 * See http://jqueryui.com/upgrade-guide/1.9/#deprecated-offset-option-merged-into-my-and-at
  			 * and http://jsfiddle.net/mar10/6xtu9a4e/
  			 *
  			 * @param {object} opts
  			 * @returns {object} the (potentially modified) original opts hash object
  			 */
  			fixPositionOptions: function(opts) {
  				if (opts.offset || ("" + opts.my + opts.at).indexOf("%") >= 0) {
  					$.error(
  						"expected new position syntax (but '%' is not supported)"
  					);
  				}
  				if (!$.ui.fancytree.jquerySupports.positionMyOfs) {
  					var // parse 'left+3 center' into ['left+3 center', 'left', '+3', 'center', undefined]
  						myParts = /(\w+)([+-]?\d+)?\s+(\w+)([+-]?\d+)?/.exec(
  							opts.my
  						),
  						atParts = /(\w+)([+-]?\d+)?\s+(\w+)([+-]?\d+)?/.exec(
  							opts.at
  						),
  						// convert to numbers
  						dx =
  							(myParts[2] ? +myParts[2] : 0) +
  							(atParts[2] ? +atParts[2] : 0),
  						dy =
  							(myParts[4] ? +myParts[4] : 0) +
  							(atParts[4] ? +atParts[4] : 0);
  
  					opts = $.extend({}, opts, {
  						// make a copy and overwrite
  						my: myParts[1] + " " + myParts[3],
  						at: atParts[1] + " " + atParts[3],
  					});
  					if (dx || dy) {
  						opts.offset = "" + dx + " " + dy;
  					}
  				}
  				return opts;
  			},
  			/** Return a {node: FancytreeNode, type: TYPE} object for a mouse event.
  			 *
  			 * @param {Event} event Mouse event, e.g. click, ...
  			 * @returns {object} Return a {node: FancytreeNode, type: TYPE} object
  			 *     TYPE: 'title' | 'prefix' | 'expander' | 'checkbox' | 'icon' | undefined
  			 */
  			getEventTarget: function(event) {
  				var $target,
  					tree,
  					tcn = event && event.target ? event.target.className : "",
  					res = { node: this.getNode(event.target), type: undefined };
  				// We use a fast version of $(res.node).hasClass()
  				// See http://jsperf.com/test-for-classname/2
  				if (/\bfancytree-title\b/.test(tcn)) {
  					res.type = "title";
  				} else if (/\bfancytree-expander\b/.test(tcn)) {
  					res.type =
  						res.node.hasChildren() === false
  							? "prefix"
  							: "expander";
  					// }else if( /\bfancytree-checkbox\b/.test(tcn) || /\bfancytree-radio\b/.test(tcn) ){
  				} else if (/\bfancytree-checkbox\b/.test(tcn)) {
  					res.type = "checkbox";
  				} else if (/\bfancytree(-custom)?-icon\b/.test(tcn)) {
  					res.type = "icon";
  				} else if (/\bfancytree-node\b/.test(tcn)) {
  					// Somewhere near the title
  					res.type = "title";
  				} else if (event && event.target) {
  					$target = $(event.target);
  					if ($target.is("ul[role=group]")) {
  						// #nnn: Clicking right to a node may hit the surrounding UL
  						tree = res.node && res.node.tree;
  						(tree || FT).debug("Ignoring click on outer UL.");
  						res.node = null;
  					} else if ($target.closest(".fancytree-title").length) {
  						// #228: clicking an embedded element inside a title
  						res.type = "title";
  					} else if ($target.closest(".fancytree-checkbox").length) {
  						// E.g. <svg> inside checkbox span
  						res.type = "checkbox";
  					} else if ($target.closest(".fancytree-expander").length) {
  						res.type = "expander";
  					}
  				}
  				return res;
  			},
  			/** Return a string describing the affected node region for a mouse event.
  			 *
  			 * @param {Event} event Mouse event, e.g. click, mousemove, ...
  			 * @returns {string} 'title' | 'prefix' | 'expander' | 'checkbox' | 'icon' | undefined
  			 */
  			getEventTargetType: function(event) {
  				return this.getEventTarget(event).type;
  			},
  			/** Return a FancytreeNode instance from element, event, or jQuery object.
  			 *
  			 * @param {Element | jQueryObject | Event} el
  			 * @returns {FancytreeNode} matching node or null
  			 */
  			getNode: function(el) {
  				if (el instanceof FancytreeNode) {
  					return el; // el already was a FancytreeNode
  				} else if (el instanceof $) {
  					el = el[0]; // el was a jQuery object: use the DOM element
  				} else if (el.originalEvent !== undefined) {
  					el = el.target; // el was an Event
  				}
  				while (el) {
  					if (el.ftnode) {
  						return el.ftnode;
  					}
  					el = el.parentNode;
  				}
  				return null;
  			},
  			/** Return a Fancytree instance, from element, index, event, or jQueryObject.
  			 *
  			 * @param {Element | jQueryObject | Event | integer | string} [el]
  			 * @returns {Fancytree} matching tree or null
  			 * @example
  			 * $.ui.fancytree.getTree();  // Get first Fancytree instance on page
  			 * $.ui.fancytree.getTree(1);  // Get second Fancytree instance on page
  			 * $.ui.fancytree.getTree(event);  // Get tree for this mouse- or keyboard event
  			 * $.ui.fancytree.getTree("foo");  // Get tree for this `opts.treeId`
  			 * $.ui.fancytree.getTree("#tree");  // Get tree for this matching element
  			 *
  			 * @since 2.13
  			 */
  			getTree: function(el) {
  				var widget,
  					orgEl = el;
  
  				if (el instanceof Fancytree) {
  					return el; // el already was a Fancytree
  				}
  				if (el === undefined) {
  					el = 0; // get first tree
  				}
  				if (typeof el === "number") {
  					el = $(".fancytree-container").eq(el); // el was an integer: return nth instance
  				} else if (typeof el === "string") {
  					// `el` may be a treeId or a selector:
  					el = $("#ft-id-" + orgEl).eq(0);
  					if (!el.length) {
  						el = $(orgEl).eq(0); // el was a selector: use first match
  					}
  				} else if (
  					el instanceof Element ||
  					el instanceof HTMLDocument
  				) {
  					el = $(el);
  				} else if (el instanceof $) {
  					el = el.eq(0); // el was a jQuery object: use the first
  				} else if (el.originalEvent !== undefined) {
  					el = $(el.target); // el was an Event
  				}
  				// el is a jQuery object wit one element here
  				el = el.closest(":ui-fancytree");
  				widget = el.data("ui-fancytree") || el.data("fancytree"); // the latter is required by jQuery <= 1.8
  				return widget ? widget.tree : null;
  			},
  			/** Return an option value that has a default, but may be overridden by a
  			 * callback or a node instance attribute.
  			 *
  			 * Evaluation sequence:
  			 *
  			 * If `tree.options.<optionName>` is a callback that returns something, use that.
  			 * Else if `node.<optionName>` is defined, use that.
  			 * Else if `tree.options.<optionName>` is a value, use that.
  			 * Else use `defaultValue`.
  			 *
  			 * @param {string} optionName name of the option property (on node and tree)
  			 * @param {FancytreeNode} node passed to the callback
  			 * @param {object} nodeObject where to look for the local option property, e.g. `node` or `node.data`
  			 * @param {object} treeOption where to look for the tree option, e.g. `tree.options` or `tree.options.dnd5`
  			 * @param {any} [defaultValue]
  			 * @returns {any}
  			 *
  			 * @example
  			 * // Check for node.foo, tree,options.foo(), and tree.options.foo:
  			 * $.ui.fancytree.evalOption("foo", node, node, tree.options);
  			 * // Check for node.data.bar, tree,options.qux.bar(), and tree.options.qux.bar:
  			 * $.ui.fancytree.evalOption("bar", node, node.data, tree.options.qux);
  			 *
  			 * @since 2.22
  			 */
  			evalOption: function(
  				optionName,
  				node,
  				nodeObject,
  				treeOptions,
  				defaultValue
  			) {
  				var ctx,
  					res,
  					tree = node.tree,
  					treeOpt = treeOptions[optionName],
  					nodeOpt = nodeObject[optionName];
  
  				if ($.isFunction(treeOpt)) {
  					ctx = {
  						node: node,
  						tree: tree,
  						widget: tree.widget,
  						options: tree.widget.options,
  						typeInfo: tree.types[node.type] || {},
  					};
  					res = treeOpt.call(tree, { type: optionName }, ctx);
  					if (res == null) {
  						res = nodeOpt;
  					}
  				} else {
  					res = nodeOpt == null ? treeOpt : nodeOpt;
  				}
  				if (res == null) {
  					res = defaultValue; // no option set at all: return default
  				}
  				return res;
  			},
  			/** Set expander, checkbox, or node icon, supporting string and object format.
  			 *
  			 * @param {Element | jQueryObject} span
  			 * @param {string} baseClass
  			 * @param {string | object} icon
  			 * @since 2.27
  			 */
  			setSpanIcon: function(span, baseClass, icon) {
  				var $span = $(span);
  
  				if (typeof icon === "string") {
  					$span.attr("class", baseClass + " " + icon);
  				} else {
  					// support object syntax: { text: ligature, addClasse: classname }
  					if (icon.text) {
  						$span.text("" + icon.text);
  					} else if (icon.html) {
  						span.innerHTML = icon.html;
  					}
  					$span.attr(
  						"class",
  						baseClass + " " + (icon.addClass || "")
  					);
  				}
  			},
  			/** Convert a keydown or mouse event to a canonical string like 'ctrl+a',
  			 * 'ctrl+shift+f2', 'shift+leftdblclick'.
  			 *
  			 * This is especially handy for switch-statements in event handlers.
  			 *
  			 * @param {event}
  			 * @returns {string}
  			 *
  			 * @example
  
  			switch( $.ui.fancytree.eventToString(event) ) {
  				case "-":
  					tree.nodeSetExpanded(ctx, false);
  					break;
  				case "shift+return":
  					tree.nodeSetActive(ctx, true);
  					break;
  				case "down":
  					res = node.navigate(event.which, activate);
  					break;
  				default:
  					handled = false;
  			}
  			if( handled ){
  				event.preventDefault();
  			}
  			*/
  			eventToString: function(event) {
  				// Poor-man's hotkeys. See here for a complete implementation:
  				//   https://github.com/jeresig/jquery.hotkeys
  				var which = event.which,
  					et = event.type,
  					s = [];
  
  				if (event.altKey) {
  					s.push("alt");
  				}
  				if (event.ctrlKey) {
  					s.push("ctrl");
  				}
  				if (event.metaKey) {
  					s.push("meta");
  				}
  				if (event.shiftKey) {
  					s.push("shift");
  				}
  
  				if (et === "click" || et === "dblclick") {
  					s.push(MOUSE_BUTTONS[event.button] + et);
  				} else if (et === "wheel") {
  					s.push(et);
  				} else if (!IGNORE_KEYCODES[which]) {
  					s.push(
  						SPECIAL_KEYCODES[which] ||
  							String.fromCharCode(which).toLowerCase()
  					);
  				}
  				return s.join("+");
  			},
  			/** Write message to console if debugLevel >= 3
  			 * @param {string} msg
  			 */
  			info: function(msg) {
  				if ($.ui.fancytree.debugLevel >= 3) {
  					consoleApply("info", arguments);
  				}
  			},
  			/* @deprecated: use eventToString(event) instead.
  			 */
  			keyEventToString: function(event) {
  				this.warn(
  					"keyEventToString() is deprecated: use eventToString()"
  				);
  				return this.eventToString(event);
  			},
  			/** Return a wrapped handler method, that provides `this._super`.
  			 *
  			 * @example
  				// Implement `opts.createNode` event to add the 'draggable' attribute
  				$.ui.fancytree.overrideMethod(ctx.options, "createNode", function(event, data) {
  					// Default processing if any
  					this._super.apply(this, arguments);
  					// Add 'draggable' attribute
  					data.node.span.draggable = true;
  				});
  			 *
  			 * @param {object} instance
  			 * @param {string} methodName
  			 * @param {function} handler
  			 * @param {object} [context] optional context
  			 */
  			overrideMethod: function(instance, methodName, handler, context) {
  				var prevSuper,
  					_super = instance[methodName] || $.noop;
  
  				instance[methodName] = function() {
  					var self = context || this;
  
  					try {
  						prevSuper = self._super;
  						self._super = _super;
  						return handler.apply(self, arguments);
  					} finally {
  						self._super = prevSuper;
  					}
  				};
  			},
  			/**
  			 * Parse tree data from HTML <ul> markup
  			 *
  			 * @param {jQueryObject} $ul
  			 * @returns {NodeData[]}
  			 */
  			parseHtml: function($ul) {
  				var classes,
  					className,
  					extraClasses,
  					i,
  					iPos,
  					l,
  					tmp,
  					tmp2,
  					$children = $ul.find(">li"),
  					children = [];
  
  				$children.each(function() {
  					var allData,
  						lowerCaseAttr,
  						$li = $(this),
  						$liSpan = $li.find(">span", this).first(),
  						$liA = $liSpan.length ? null : $li.find(">a").first(),
  						d = { tooltip: null, data: {} };
  
  					if ($liSpan.length) {
  						d.title = $liSpan.html();
  					} else if ($liA && $liA.length) {
  						// If a <li><a> tag is specified, use it literally and extract href/target.
  						d.title = $liA.html();
  						d.data.href = $liA.attr("href");
  						d.data.target = $liA.attr("target");
  						d.tooltip = $liA.attr("title");
  					} else {
  						// If only a <li> tag is specified, use the trimmed string up to
  						// the next child <ul> tag.
  						d.title = $li.html();
  						iPos = d.title.search(/<ul/i);
  						if (iPos >= 0) {
  							d.title = d.title.substring(0, iPos);
  						}
  					}
  					d.title = $.trim(d.title);
  
  					// Make sure all fields exist
  					for (i = 0, l = CLASS_ATTRS.length; i < l; i++) {
  						d[CLASS_ATTRS[i]] = undefined;
  					}
  					// Initialize to `true`, if class is set and collect extraClasses
  					classes = this.className.split(" ");
  					extraClasses = [];
  					for (i = 0, l = classes.length; i < l; i++) {
  						className = classes[i];
  						if (CLASS_ATTR_MAP[className]) {
  							d[className] = true;
  						} else {
  							extraClasses.push(className);
  						}
  					}
  					d.extraClasses = extraClasses.join(" ");
  
  					// Parse node options from ID, title and class attributes
  					tmp = $li.attr("title");
  					if (tmp) {
  						d.tooltip = tmp; // overrides <a title='...'>
  					}
  					tmp = $li.attr("id");
  					if (tmp) {
  						d.key = tmp;
  					}
  					// Translate hideCheckbox -> checkbox:false
  					if ($li.attr("hideCheckbox")) {
  						d.checkbox = false;
  					}
  					// Add <li data-NAME='...'> as node.data.NAME
  					allData = _getElementDataAsDict($li);
  					if (allData && !$.isEmptyObject(allData)) {
  						// #507: convert data-hidecheckbox (lower case) to hideCheckbox
  						for (lowerCaseAttr in NODE_ATTR_LOWERCASE_MAP) {
  							if (allData.hasOwnProperty(lowerCaseAttr)) {
  								allData[
  									NODE_ATTR_LOWERCASE_MAP[lowerCaseAttr]
  								] = allData[lowerCaseAttr];
  								delete allData[lowerCaseAttr];
  							}
  						}
  						// #56: Allow to set special node.attributes from data-...
  						for (i = 0, l = NODE_ATTRS.length; i < l; i++) {
  							tmp = NODE_ATTRS[i];
  							tmp2 = allData[tmp];
  							if (tmp2 != null) {
  								delete allData[tmp];
  								d[tmp] = tmp2;
  							}
  						}
  						// All other data-... goes to node.data...
  						$.extend(d.data, allData);
  					}
  					// Recursive reading of child nodes, if LI tag contains an UL tag
  					$ul = $li.find(">ul").first();
  					if ($ul.length) {
  						d.children = $.ui.fancytree.parseHtml($ul);
  					} else {
  						d.children = d.lazy ? undefined : null;
  					}
  					children.push(d);
  					// FT.debug("parse ", d, children);
  				});
  				return children;
  			},
  			/** Add Fancytree extension definition to the list of globally available extensions.
  			 *
  			 * @param {object} definition
  			 */
  			registerExtension: function(definition) {
  				_assert(
  					definition.name != null,
  					"extensions must have a `name` property."
  				);
  				_assert(
  					definition.version != null,
  					"extensions must have a `version` property."
  				);
  				$.ui.fancytree._extensions[definition.name] = definition;
  			},
  			/** Inverse of escapeHtml().
  			 *
  			 * @param {string} s
  			 * @returns {string}
  			 */
  			unescapeHtml: function(s) {
  				var e = document.createElement("div");
  				e.innerHTML = s;
  				return e.childNodes.length === 0
  					? ""
  					: e.childNodes[0].nodeValue;
  			},
  			/** Write warning message to console if debugLevel >= 2.
  			 * @param {string} msg
  			 */
  			warn: function(msg) {
  				if ($.ui.fancytree.debugLevel >= 2) {
  					consoleApply("warn", arguments);
  				}
  			},
  		}
  	);
  
  	// Value returned by `require('jquery.fancytree')`
  	return $.ui.fancytree;
  }); // End of closure
  