text: /**
   * gridstack.js 0.6.4-dev
   * https://gridstackjs.com/
   * (c) 2014-2020 Alain Dumesny, Dylan Weiss, Pavel Reznikov
   * gridstack.js may be freely distributed under the MIT license.
   * @preserve
  */
  (function(factory) {
    if (typeof define === 'function' && define.amd) {
      define(['jquery', 'exports'], factory);
    } else if (typeof exports !== 'undefined') {
      var jQueryModule;
  
      try { jQueryModule = require('jquery'); } catch (e) {}
  
      factory(jQueryModule || window.jQuery, exports);
    } else {
      factory(window.jQuery, window);
    }
  })(function($, scope) {
  
    // checks for obsolete method names
    var obsolete = function(f, oldName, newName, rev) {
      var wrapper = function() {
        console.warn('gridstack.js: Function `' + oldName + '` is deprecated in ' + rev + ' and has been replaced ' +
        'with `' + newName + '`. It will be **completely** removed in v1.0');
        return f.apply(this, arguments);
      };
      wrapper.prototype = f.prototype;
  
      return wrapper;
    };
  
    // checks for obsolete grid options (can be used for any fields, but msg is about options)
    var obsoleteOpts = function(opts, oldName, newName, rev) {
      if (opts[oldName] !== undefined) {
        opts[newName] = opts[oldName];
        console.warn('gridstack.js: Option `' + oldName + '` is deprecated in ' + rev + ' and has been replaced with `' +
          newName + '`. It will be **completely** removed in v1.0');
      }
    };
  
    // checks for obsolete grid options which are gone
    var obsoleteOptsDel = function(opts, oldName, rev, info) {
      if (opts[oldName] !== undefined) {
        console.warn('gridstack.js: Option `' + oldName + '` is deprecated in ' + rev + info);
      }
    };
  
    // checks for obsolete Jquery element attributes
    var obsoleteAttr = function(el, oldName, newName, rev) {
      var oldAttr = el.attr(oldName);
      if (oldAttr !== undefined) {
        el.attr(newName, oldAttr);
        console.warn('gridstack.js: attribute `' + oldName + '`=' + oldAttr + ' is deprecated on this object in ' + rev + ' and has been replaced with `' +
          newName + '`. It will be **completely** removed in v1.0');
      }
    };
  
    var Utils = {
  
      isIntercepted: function(a, b) {
        return !(a.x + a.width <= b.x || b.x + b.width <= a.x || a.y + a.height <= b.y || b.y + b.height <= a.y);
      },
  
      sort: function(nodes, dir, column) {
        if (!column) {
          var widths = nodes.map(function(node) { return node.x + node.width; });
          column = Math.max.apply(Math, widths);
        }
  
        if (dir === -1)
          return Utils.sortBy(nodes, function(n) { return -(n.x + n.y * column); });
        else
          return Utils.sortBy(nodes, function(n) { return (n.x + n.y * column); });
      },
  
      createStylesheet: function(id, parent) {
        var style = document.createElement('style');
        style.setAttribute('type', 'text/css');
        style.setAttribute('data-gs-style-id', id);
        if (style.styleSheet) {
          style.styleSheet.cssText = '';
        } else {
          style.appendChild(document.createTextNode(''));
        }
        if (!parent) { parent = document.getElementsByTagName('head')[0]; } // default to head
        parent.insertBefore(style, parent.firstChild);
        return style.sheet;
      },
  
      removeStylesheet: function(id) {
        $('STYLE[data-gs-style-id=' + id + ']').remove();
      },
  
      insertCSSRule: function(sheet, selector, rules, index) {
        if (typeof sheet.insertRule === 'function') {
          sheet.insertRule(selector + '{' + rules + '}', index);
        } else if (typeof sheet.addRule === 'function') {
          sheet.addRule(selector, rules, index);
        }
      },
  
      toBool: function(v) {
        if (typeof v === 'boolean') {
          return v;
        }
        if (typeof v === 'string') {
          v = v.toLowerCase();
          return !(v === '' || v === 'no' || v === 'false' || v === '0');
        }
        return Boolean(v);
      },
  
      _collisionNodeCheck: function(n) {
        return n !== this.node && Utils.isIntercepted(n, this.nn);
      },
  
      _didCollide: function(bn) {
        return Utils.isIntercepted({x: this.n.x, y: this.newY, width: this.n.width, height: this.n.height}, bn);
      },
  
      _isAddNodeIntercepted: function(n) {
        return Utils.isIntercepted({x: this.x, y: this.y, width: this.node.width, height: this.node.height}, n);
      },
  
      parseHeight: function(val) {
        var height = val;
        var heightUnit = 'px';
        if (height && typeof height === 'string') {
          var match = height.match(/^(-[0-9]+\.[0-9]+|[0-9]*\.[0-9]+|-[0-9]+|[0-9]+)(px|em|rem|vh|vw|%)?$/);
          if (!match) {
            throw new Error('Invalid height');
          }
          heightUnit = match[2] || 'px';
          height = parseFloat(match[1]);
        }
        return {height: height, unit: heightUnit};
      },
  
      without:  function(array, item) {
        var index = array.indexOf(item);
  
        if (index !== -1) {
          array = array.slice(0);
          array.splice(index, 1);
        }
  
        return array;
      },
  
      sortBy: function(array, getter) {
        return array.slice(0).sort(function(left, right) {
          var valueLeft = getter(left);
          var valueRight = getter(right);
  
          if (valueRight === valueLeft) {
            return 0;
          }
  
          return valueLeft > valueRight ? 1 : -1;
        });
      },
  
      defaults: function(target) {
        var sources = Array.prototype.slice.call(arguments, 1);
  
        sources.forEach(function(source) {
          for (var prop in source) {
            if (source.hasOwnProperty(prop) && (!target.hasOwnProperty(prop) || target[prop] === undefined)) {
              target[prop] = source[prop];
            }
          }
        });
  
        return target;
      },
  
      clone: function(target) {
        return $.extend({}, target);
      },
  
      throttle: function(callback, delay) {
        var isWaiting = false;
  
        return function() {
          if (!isWaiting) {
            callback.apply(this, arguments);
            isWaiting = true;
            setTimeout(function() { isWaiting = false; }, delay);
          }
        };
      },
  
      removePositioningStyles: function(el) {
        var style = el[0].style;
        if (style.position) {
          style.removeProperty('position');
        }
        if (style.left) {
          style.removeProperty('left');
        }
        if (style.top) {
          style.removeProperty('top');
        }
        if (style.width) {
          style.removeProperty('width');
        }
        if (style.height) {
          style.removeProperty('height');
        }
      },
      getScrollParent: function(el) {
        var returnEl;
        if (el === null) {
          returnEl = null;
        } else if (el.scrollHeight > el.clientHeight) {
          returnEl = el;
        } else {
          returnEl = Utils.getScrollParent(el.parentNode);
        }
        return returnEl;
      },
      updateScrollPosition: function(el, ui, distance) {
        // is widget in view?
        var rect = el.getBoundingClientRect();
        var innerHeightOrClientHeight = (window.innerHeight || document.documentElement.clientHeight);
        if (rect.top < 0 ||
          rect.bottom > innerHeightOrClientHeight
        ) {
          // set scrollTop of first parent that scrolls
          // if parent is larger than el, set as low as possible
          // to get entire widget on screen
          var offsetDiffDown = rect.bottom - innerHeightOrClientHeight;
          var offsetDiffUp = rect.top;
          var scrollEl = Utils.getScrollParent(el);
          if (scrollEl !== null) {
            var prevScroll = scrollEl.scrollTop;
            if (rect.top < 0 && distance < 0) {
              // moving up
              if (el.offsetHeight > innerHeightOrClientHeight) {
                scrollEl.scrollTop += distance;
              } else {
                scrollEl.scrollTop += Math.abs(offsetDiffUp) > Math.abs(distance) ? distance : offsetDiffUp;
              }
            } else if (distance > 0) {
              // moving down
              if (el.offsetHeight > innerHeightOrClientHeight) {
                scrollEl.scrollTop += distance;
              } else {
                scrollEl.scrollTop += offsetDiffDown > distance ? distance : offsetDiffDown;
              }
            }
            // move widget y by amount scrolled
            ui.position.top += scrollEl.scrollTop - prevScroll;
          }
        }
      }
    };
  
    /**
    * @class GridStackDragDropPlugin
    * Base class for drag'n'drop plugin.
    */
    function GridStackDragDropPlugin(grid) {
      this.grid = grid;
    }
  
    GridStackDragDropPlugin.registeredPlugins = [];
  
    GridStackDragDropPlugin.registerPlugin = function(pluginClass) {
      GridStackDragDropPlugin.registeredPlugins.push(pluginClass);
    };
  
    GridStackDragDropPlugin.prototype.resizable = function(el, opts) {
      return this;
    };
  
    GridStackDragDropPlugin.prototype.draggable = function(el, opts) {
      return this;
    };
  
    GridStackDragDropPlugin.prototype.droppable = function(el, opts) {
      return this;
    };
  
    GridStackDragDropPlugin.prototype.isDroppable = function(el) {
      return false;
    };
  
    GridStackDragDropPlugin.prototype.on = function(el, eventName, callback) {
      return this;
    };
  
  
    var idSeq = 0;
  
    var GridStackEngine = function(column, onchange, float, maxRow, items) {
      this.column = column || 12;
      this.float = float || false;
      this.maxRow = maxRow || 0;
  
      this.nodes = items || [];
      this.onchange = onchange || function() {};
  
      this._addedNodes = [];
      this._removedNodes = [];
      this._batchMode = false;
    };
  
    GridStackEngine.prototype.batchUpdate = function() {
      if (this._batchMode) return;
      this._batchMode = true;
      this._prevFloat = this.float;
      this.float = true; // let things go anywhere for now... commit() will restore and possibly reposition
    };
  
    GridStackEngine.prototype.commit = function() {
      if (!this._batchMode) return;
      this._batchMode = false;
      this.float = this._prevFloat;
      delete this._prevFloat;
      this._packNodes();
      this._notify();
    };
  
    // For Meteor support: https://github.com/gridstack/gridstack.js/pull/272
    GridStackEngine.prototype.getNodeDataByDOMEl = function(el) {
      return this.nodes.find(function(n) { return el.get(0) === n.el.get(0); });
    };
  
    GridStackEngine.prototype._fixCollisions = function(node) {
      var self = this;
      this._sortNodes(-1);
  
      var nn = node;
      var hasLocked = Boolean(this.nodes.find(function(n) { return n.locked; }));
      if (!this.float && !hasLocked) {
        nn = {x: 0, y: node.y, width: this.column, height: node.height};
      }
      while (true) {
        var collisionNode = this.nodes.find(Utils._collisionNodeCheck, {node: node, nn: nn});
        if (!collisionNode) { return; }
        this.moveNode(collisionNode, collisionNode.x, node.y + node.height,
          collisionNode.width, collisionNode.height, true);
      }
    };
  
    GridStackEngine.prototype.isAreaEmpty = function(x, y, width, height) {
      var nn = {x: x || 0, y: y || 0, width: width || 1, height: height || 1};
      var collisionNode = this.nodes.find(function(n) {
        return Utils.isIntercepted(n, nn);
      });
      return !collisionNode;
    };
  
    GridStackEngine.prototype._sortNodes = function(dir) {
      this.nodes = Utils.sort(this.nodes, dir, this.column);
    };
  
    GridStackEngine.prototype._packNodes = function() {
      this._sortNodes();
  
      if (this.float) {
        this.nodes.forEach(function(n, i) {
          if (n._updating || n._packY === undefined || n.y === n._packY) {
            return;
          }
  
          var newY = n.y;
          while (newY >= n._packY) {
            var collisionNode = this.nodes
              .slice(0, i)
              .find(Utils._didCollide, {n: n, newY: newY});
  
            if (!collisionNode) {
              n._dirty = true;
              n.y = newY;
            }
            --newY;
          }
        }, this);
      } else {
        this.nodes.forEach(function(n, i) {
          if (n.locked) { return; }
          while (n.y > 0) {
            var newY = n.y - 1;
            var canBeMoved = i === 0;
  
            if (i > 0) {
              var collisionNode = this.nodes
                .slice(0, i)
                .find(Utils._didCollide, {n: n, newY: newY});
              canBeMoved = collisionNode === undefined;
            }
  
            if (!canBeMoved) { break; }
            // Note: must be dirty (from last position) for GridStack::OnChange CB to update positions
            // and move items back. The user 'change' CB should detect changes from the original
            // starting position instead.
            n._dirty = (n.y !== newY);
            n.y = newY;
          }
        }, this);
      }
    };
  
    GridStackEngine.prototype._prepareNode = function(node, resizing) {
      node = node || {};
      // if we're missing position, have the grid position us automatically (before we set them to 0,0)
      if (node.x === undefined || node.y === undefined || node.x === null || node.y === null) {
        node.autoPosition = true;
      }
  
      // assign defaults for missing required fields
      var defaults = {width: 1, height: 1, x: 0, y: 0};
      node = Utils.defaults(node, defaults);
  
      // convert any strings over
      node.x = parseInt(node.x);
      node.y = parseInt(node.y);
      node.width = parseInt(node.width);
      node.height = parseInt(node.height);
      node.autoPosition = node.autoPosition || false;
      node.noResize = node.noResize || false;
      node.noMove = node.noMove || false;
  
      // check for NaN (in case messed up strings were passed. can't do parseInt() || defaults.x above as 0 is valid #)
      if (Number.isNaN(node.x))      { node.x = defaults.x; node.autoPosition = true; }
      if (Number.isNaN(node.y))      { node.y = defaults.y; node.autoPosition = true; }
      if (Number.isNaN(node.width))  { node.width = defaults.width; }
      if (Number.isNaN(node.height)) { node.height = defaults.height; }
  
      if (node.width > this.column) {
        node.width = this.column;
      } else if (node.width < 1) {
        node.width = 1;
      }
  
      if (node.height < 1) {
        node.height = 1;
      }
  
      if (node.x < 0) {
        node.x = 0;
      }
  
      if (node.x + node.width > this.column) {
        if (resizing) {
          node.width = this.column - node.x;
        } else {
          node.x = this.column - node.width;
        }
      }
  
      if (node.y < 0) {
        node.y = 0;
      }
  
      return node;
    };
  
    GridStackEngine.prototype._notify = function() {
      if (this._batchMode) { return; }
      var args = Array.prototype.slice.call(arguments, 0);
      args[0] = (args[0] === undefined ? [] : (Array.isArray(args[0]) ? args[0] : [args[0]]) );
      args[1] = (args[1] === undefined ? true : args[1]);
      var dirtyNodes = args[0].concat(this.getDirtyNodes());
      this.onchange(dirtyNodes, args[1]);
    };
  
    GridStackEngine.prototype.cleanNodes = function() {
      if (this._batchMode) { return; }
      this.nodes.forEach(function(n) { delete n._dirty; });
    };
  
    GridStackEngine.prototype.getDirtyNodes = function(verify) {
      // compare original X,Y,W,H (or entire node?) instead as _dirty can be a temporary state
      if (verify) {
        var dirtNodes = [];
        this.nodes.forEach(function (n) {
          if (n._dirty) {
            if (n.y === n._origY && n.x === n._origX && n.width === n._origW && n.height === n._origH) {
              delete n._dirty;
            } else {
              dirtNodes.push(n);
            }
          }
        });
        return dirtNodes;
      }
  
      return this.nodes.filter(function(n) { return n._dirty; });
    };
  
    GridStackEngine.prototype.addNode = function(node, triggerAddEvent) {
      node = this._prepareNode(node);
  
      if (node.maxWidth !== undefined) { node.width = Math.min(node.width, node.maxWidth); }
      if (node.maxHeight !== undefined) { node.height = Math.min(node.height, node.maxHeight); }
      if (node.minWidth !== undefined) { node.width = Math.max(node.width, node.minWidth); }
      if (node.minHeight !== undefined) { node.height = Math.max(node.height, node.minHeight); }
  
      node._id = node._id || ++idSeq;
  
      if (node.autoPosition) {
        this._sortNodes();
  
        for (var i = 0;; ++i) {
          var x = i % this.column;
          var y = Math.floor(i / this.column);
          if (x + node.width > this.column) {
            continue;
          }
          if (!this.nodes.find(Utils._isAddNodeIntercepted, {x: x, y: y, node: node})) {
            node.x = x;
            node.y = y;
            delete node.autoPosition; // found our slot
            break;
          }
        }
      }
  
      this.nodes.push(node);
      if (triggerAddEvent) {
        this._addedNodes.push(node);
      }
  
      this._fixCollisions(node);
      this._packNodes();
      this._notify();
      return node;
    };
  
    GridStackEngine.prototype.removeNode = function(node, detachNode) {
      detachNode = (detachNode === undefined ? true : detachNode);
      this._removedNodes.push(node);
      node._id = null; // hint that node is being removed
      this.nodes = Utils.without(this.nodes, node);
      this._packNodes();
      this._notify(node, detachNode);
    };
  
    GridStackEngine.prototype.removeAll = function(detachNode) {
      delete this._layouts;
      if (this.nodes.length === 0) { return; }
      detachNode = (detachNode === undefined ? true : detachNode);
      this.nodes.forEach(function(n) { n._id = null; }); // hint that node is being removed
      this._removedNodes = this.nodes;
      this.nodes = [];
      this._notify(this._removedNodes, detachNode);
    };
  
    GridStackEngine.prototype.canMoveNode = function(node, x, y, width, height) {
      if (!this.isNodeChangedPosition(node, x, y, width, height)) {
        return false;
      }
      var hasLocked = Boolean(this.nodes.find(function(n) { return n.locked; }));
  
      if (!this.maxRow && !hasLocked) {
        return true;
      }
  
      var clonedNode;
      var clone = new GridStackEngine(
        this.column,
        null,
        this.float,
        0,
        this.nodes.map(function(n) {
          if (n === node) {
            clonedNode = $.extend({}, n);
            return clonedNode;
          }
          return $.extend({}, n);
        }));
  
      if (!clonedNode) {  return true;}
  
      clone.moveNode(clonedNode, x, y, width, height);
  
      var res = true;
  
      if (hasLocked) {
        res &= !Boolean(clone.nodes.find(function(n) {
          return n !== clonedNode && Boolean(n.locked) && Boolean(n._dirty);
        }));
      }
      if (this.maxRow) {
        res &= clone.getGridHeight() <= this.maxRow;
      }
  
      return res;
    };
  
    GridStackEngine.prototype.canBePlacedWithRespectToHeight = function(node) {
      if (!this.maxRow) {
        return true;
      }
  
      var clone = new GridStackEngine(
        this.column,
        null,
        this.float,
        0,
        this.nodes.map(function(n) { return $.extend({}, n); }));
      clone.addNode(node);
      return clone.getGridHeight() <= this.maxRow;
    };
  
    GridStackEngine.prototype.isNodeChangedPosition = function(node, x, y, width, height) {
      if (typeof x !== 'number') { x = node.x; }
      if (typeof y !== 'number') { y = node.y; }
      if (typeof width !== 'number') { width = node.width; }
      if (typeof height !== 'number') { height = node.height; }
  
      if (node.maxWidth !== undefined) { width = Math.min(width, node.maxWidth); }
      if (node.maxHeight !== undefined) { height = Math.min(height, node.maxHeight); }
      if (node.minWidth !== undefined) { width = Math.max(width, node.minWidth); }
      if (node.minHeight !== undefined) { height = Math.max(height, node.minHeight); }
  
      if (node.x === x && node.y === y && node.width === width && node.height === height) {
        return false;
      }
      return true;
    };
  
    GridStackEngine.prototype.moveNode = function(node, x, y, width, height, noPack) {
      if (typeof x !== 'number') { x = node.x; }
      if (typeof y !== 'number') { y = node.y; }
      if (typeof width !== 'number') { width = node.width; }
      if (typeof height !== 'number') { height = node.height; }
  
      if (node.maxWidth !== undefined) { width = Math.min(width, node.maxWidth); }
      if (node.maxHeight !== undefined) { height = Math.min(height, node.maxHeight); }
      if (node.minWidth !== undefined) { width = Math.max(width, node.minWidth); }
      if (node.minHeight !== undefined) { height = Math.max(height, node.minHeight); }
  
      if (node.x === x && node.y === y && node.width === width && node.height === height) {
        return node;
      }
  
      var resizing = node.width !== width;
      node._dirty = true;
  
      node.x = x;
      node.y = y;
      node.width = width;
      node.height = height;
  
      node.lastTriedX = x;
      node.lastTriedY = y;
      node.lastTriedWidth = width;
      node.lastTriedHeight = height;
  
      node = this._prepareNode(node, resizing);
  
      this._fixCollisions(node);
      if (!noPack) {
        this._packNodes();
        this._notify();
      }
      return node;
    };
  
    GridStackEngine.prototype.getGridHeight = function() {
      return this.nodes.reduce(function(memo, n) { return Math.max(memo, n.y + n.height); }, 0);
    };
  
    GridStackEngine.prototype.beginUpdate = function(node) {
      if (node._updating) return;
      node._updating = true;
      this.nodes.forEach(function(n) { n._packY = n.y; });
    };
  
    GridStackEngine.prototype.endUpdate = function() {
      var n = this.nodes.find(function(n) { return n._updating; });
      if (n) {
        n._updating = false;
        this.nodes.forEach(function(n) { delete n._packY; });
      }
    };
  
    /**
     * Construct a grid from the given element and options
     * @param {GridStackElement} el
     * @param {GridstackOptions} opts
     */
    var GridStack = function(el, opts) {
      var self = this;
      var oneColumnMode, _prevColumn, isAutoCellHeight;
  
      opts = opts || {};
  
      this.container = $(el);
  
      obsoleteOpts(opts, 'width', 'column', 'v0.5.3');
      obsoleteOpts(opts, 'height', 'maxRow', 'v0.5.3');
      obsoleteOptsDel(opts, 'oneColumnModeClass', 'v0.6.3', '. Use class `.grid-stack-1` instead');
  
      // container attributes
      obsoleteAttr(this.container, 'data-gs-width', 'data-gs-column', 'v0.5.3');
      obsoleteAttr(this.container, 'data-gs-height', 'data-gs-max-row', 'v0.5.3');
  
      opts.itemClass = opts.itemClass || 'grid-stack-item';
      var isNested = this.container.closest('.' + opts.itemClass).length > 0;
  
      this.opts = Utils.defaults(opts, {
        column: parseInt(this.container.attr('data-gs-column')) || 12,
        maxRow: parseInt(this.container.attr('data-gs-max-row')) || 0,
        itemClass: 'grid-stack-item',
        placeholderClass: 'grid-stack-placeholder',
        placeholderText: '',
        handle: '.grid-stack-item-content',
        handleClass: null,
        cellHeight: 60,
        verticalMargin: 20,
        auto: true,
        minWidth: 768,
        float: false,
        staticGrid: false,
        _class: 'grid-stack-instance-' + (Math.random() * 10000).toFixed(0),
        animate: Boolean(this.container.attr('data-gs-animate')) || false,
        alwaysShowResizeHandle: opts.alwaysShowResizeHandle || false,
        resizable: Utils.defaults(opts.resizable || {}, {
          autoHide: !(opts.alwaysShowResizeHandle || false),
          handles: 'se'
        }),
        draggable: Utils.defaults(opts.draggable || {}, {
          handle: (opts.handleClass ? '.' + opts.handleClass : (opts.handle ? opts.handle : '')) ||
            '.grid-stack-item-content',
          scroll: false,
          appendTo: 'body'
        }),
        disableDrag: opts.disableDrag || false,
        disableResize: opts.disableResize || false,
        rtl: 'auto',
        removable: false,
        removableOptions: Utils.defaults(opts.removableOptions || {}, {
          accept: '.' + opts.itemClass
        }),
        removeTimeout: 2000,
        verticalMarginUnit: 'px',
        cellHeightUnit: 'px',
        disableOneColumnMode: opts.disableOneColumnMode || false,
        oneColumnModeDomSort: opts.oneColumnModeDomSort,
        ddPlugin: null
      });
  
      if (this.opts.ddPlugin === false) {
        this.opts.ddPlugin = GridStackDragDropPlugin;
      } else if (this.opts.ddPlugin === null) {
        this.opts.ddPlugin = GridStackDragDropPlugin.registeredPlugins[0] || GridStackDragDropPlugin;
      }
  
      this.dd = new this.opts.ddPlugin(this);
  
      if (this.opts.rtl === 'auto') {
        this.opts.rtl = this.container.css('direction') === 'rtl';
      }
  
      if (this.opts.rtl) {
        this.container.addClass('grid-stack-rtl');
      }
  
      this.opts.isNested = isNested;
  
      isAutoCellHeight = (this.opts.cellHeight === 'auto');
      if (isAutoCellHeight) {
        // make the cell square initially
        self.cellHeight(self.cellWidth(), true);
      } else {
        this.cellHeight(this.opts.cellHeight, true);
      }
      this.verticalMargin(this.opts.verticalMargin, true);
  
      this.container.addClass(this.opts._class);
  
      this._setStaticClass();
  
      if (isNested) {
        this.container.addClass('grid-stack-nested');
      }
  
      this._initStyles();
  
      this.grid = new GridStackEngine(this.opts.column, function(nodes, detachNode) {
        detachNode = (detachNode === undefined ? true : detachNode);
        var maxHeight = 0;
        this.nodes.forEach(function(n) {
          maxHeight = Math.max(maxHeight, n.y + n.height);
        });
        nodes.forEach(function(n) {
          if (detachNode && n._id === null) {
            if (n.el) {
              n.el.remove();
            }
          } else {
            n.el
              .attr('data-gs-x', n.x)
              .attr('data-gs-y', n.y)
              .attr('data-gs-width', n.width)
              .attr('data-gs-height', n.height);
          }
        });
        self._updateStyles(maxHeight + 10);
      }, this.opts.float, this.opts.maxRow);
  
      if (this.opts.auto) {
        var elements = [];
        var _this = this;
        this.container.children('.' + this.opts.itemClass + ':not(.' + this.opts.placeholderClass + ')')
          .each(function(index, el) {
            el = $(el);
            var x = parseInt(el.attr('data-gs-x'));
            var y = parseInt(el.attr('data-gs-y'));
            elements.push({
              el: el,
              // if x,y are missing (autoPosition) add them to end of list - but keep their respective DOM order
              i: (Number.isNaN(x) ? 1000 : x) + (Number.isNaN(y) ? 1000 : y) * _this.opts.column
            });
          });
        Utils.sortBy(elements, function(x) { return x.i; }).forEach(function(item) {
          this._prepareElement(item.el);
        }, this);
      }
      this.grid._saveInitial(); // initial start of items
  
      this.setAnimation(this.opts.animate);
  
      this.placeholder = $(
        '<div class="' + this.opts.placeholderClass + ' ' + this.opts.itemClass + '">' +
        '<div class="placeholder-content">' + this.opts.placeholderText + '</div></div>').hide();
  
      this._updateContainerHeight();
  
      this._updateHeightsOnResize = Utils.throttle(function() {
        self.cellHeight(self.cellWidth(), false);
      }, 100);
  
      /**
       * called when we are being resized - check if the one Column Mode needs to be turned on/off
       * and remember the prev columns we used.
       */
      this.onResizeHandler = function() {
        if (isAutoCellHeight) {
          self._updateHeightsOnResize();
        }
  
        if (self.opts.staticGrid) { return; }
  
        if (!self.opts.disableOneColumnMode && (window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth) <= self.opts.minWidth) {
          if (self.oneColumnMode) {  return; }
          self.oneColumnMode = true;
          self.setColumn(1);
        } else {
          if (!self.oneColumnMode) { return; }
          self.oneColumnMode = false;
          self.setColumn(self._prevColumn);
        }
      };
  
      $(window).resize(this.onResizeHandler);
      this.onResizeHandler();
  
      if (!self.opts.staticGrid && typeof self.opts.removable === 'string') {
        var trashZone = $(self.opts.removable);
        if (!this.dd.isDroppable(trashZone)) {
          this.dd.droppable(trashZone, self.opts.removableOptions);
        }
        this.dd
          .on(trashZone, 'dropover', function(event, ui) {
            var el = $(ui.draggable);
            var node = el.data('_gridstack_node');
            if (!node || node._grid !== self) {
              return;
            }
            el.data('inTrashZone', true);
            self._setupRemovingTimeout(el);
          })
          .on(trashZone, 'dropout', function(event, ui) {
            var el = $(ui.draggable);
            var node = el.data('_gridstack_node');
            if (!node || node._grid !== self) {
              return;
            }
            el.data('inTrashZone', false);
            self._clearRemovingTimeout(el);
          });
      }
  
      if (!self.opts.staticGrid && self.opts.acceptWidgets) {
        var draggingElement = null;
  
        var onDrag = function(event, ui) {
          var el = draggingElement;
          var node = el.data('_gridstack_node');
          var pos = self.getCellFromPixel({left: event.pageX, top: event.pageY}, true);
          var x = Math.max(0, pos.x);
          var y = Math.max(0, pos.y);
          if (!node._added) {
            node._added = true;
  
            node.el = el;
            node.autoPosition = true;
            node.x = x;
            node.y = y;
            self.grid.cleanNodes();
            self.grid.beginUpdate(node);
            self.grid.addNode(node);
  
            self.container.append(self.placeholder);
            self.placeholder
              .attr('data-gs-x', node.x)
              .attr('data-gs-y', node.y)
              .attr('data-gs-width', node.width)
              .attr('data-gs-height', node.height)
              .show();
            node.el = self.placeholder;
            node._beforeDragX = node.x;
            node._beforeDragY = node.y;
  
            self._updateContainerHeight();
          }
          if (!self.grid.canMoveNode(node, x, y)) {
            return;
          }
          self.grid.moveNode(node, x, y);
          self._updateContainerHeight();
        };
  
        this.dd
          .droppable(self.container, {
            accept: function(el) {
              el = $(el);
              var node = el.data('_gridstack_node');
              if (node && node._grid === self) {
                return false;
              }
              return el.is(self.opts.acceptWidgets === true ? '.grid-stack-item' : self.opts.acceptWidgets);
            }
          })
          .on(self.container, 'dropover', function(event, ui) {
            var el = $(ui.draggable);
            var width, height;
  
            // see if we already have a node with widget/height and check for attributes
            var origNode = el.data('_gridstack_node');
            if (!origNode || !origNode.width || !origNode.height) {
              var w = parseInt(el.attr('data-gs-width'));
              if (w > 0) { origNode = origNode || {}; origNode.width = w; }
              var h = parseInt(el.attr('data-gs-height'));
              if (h > 0) { origNode = origNode || {}; origNode.height = h; }
            }
  
            // if not calculate the grid size based on element outer size
            // height: Each row is cellHeight + verticalMargin, until last one which has no margin below
            var cellWidth = self.cellWidth();
            var cellHeight = self.cellHeight();
            var verticalMargin = self.opts.verticalMargin;
            width = origNode && origNode.width ? origNode.width : Math.ceil(el.outerWidth() / cellWidth);
            height = origNode && origNode.height ? origNode.height : Math.round((el.outerHeight() + verticalMargin) / (cellHeight + verticalMargin));
  
            draggingElement = el;
  
            var node = self.grid._prepareNode({width: width, height: height, _added: false, _temporary: true});
            node.isOutOfGrid = true;
            el.data('_gridstack_node', node);
            el.data('_gridstack_node_orig', origNode);
  
            el.on('drag', onDrag);
            return false; // prevent parent from receiving msg (which may be grid as well)
          })
          .on(self.container, 'dropout', function(event, ui) {
            // jquery-ui bug. Must verify widget is being dropped out
            // check node variable that gets set when widget is out of grid
            var el = $(ui.draggable);
            if (!el.data('_gridstack_node')) {
              return;
            }
            var node = el.data('_gridstack_node');
            if (!node.isOutOfGrid) {
              return;
            }
            el.unbind('drag', onDrag);
            node.el = null;
            self.grid.removeNode(node);
            self.placeholder.detach();
            self._updateContainerHeight();
            el.data('_gridstack_node', el.data('_gridstack_node_orig'));
            return false; // prevent parent from receiving msg (which may be grid as well)
          })
          .on(self.container, 'drop', function(event, ui) {
            self.placeholder.detach();
  
            var node = $(ui.draggable).data('_gridstack_node');
            node.isOutOfGrid = false;
            node._grid = self;
            var el = $(ui.draggable).clone(false);
            el.data('_gridstack_node', node);
            var originalNode = $(ui.draggable).data('_gridstack_node_orig');
            if (originalNode !== undefined && originalNode._grid !== undefined) {
              originalNode._grid._triggerRemoveEvent();
            }
            $(ui.helper).remove();
            node.el = el;
            self.placeholder.hide();
            Utils.removePositioningStyles(el);
            el.find('div.ui-resizable-handle').remove();
  
            el
              .attr('data-gs-x', node.x)
              .attr('data-gs-y', node.y)
              .attr('data-gs-width', node.width)
              .attr('data-gs-height', node.height)
              .addClass(self.opts.itemClass)
              .enableSelection()
              .removeData('draggable')
              .removeClass('ui-draggable ui-draggable-dragging ui-draggable-disabled')
              .unbind('drag', onDrag);
            self.container.append(el);
            self._prepareElementsByNode(el, node);
            self._updateContainerHeight();
            self.grid._addedNodes.push(node);
            self._triggerAddEvent();
            self._triggerChangeEvent();
  
            self.grid.endUpdate();
            $(ui.draggable).unbind('drag', onDrag);
            $(ui.draggable).removeData('_gridstack_node');
            $(ui.draggable).removeData('_gridstack_node_orig');
            self.container.trigger('dropped', [originalNode, node]);
            return false; // prevent parent from receiving msg (which may be grid as well)
          });
      }
    };
  
    GridStack.prototype._triggerChangeEvent = function(/*forceTrigger*/) {
      if (this.grid._batchMode) { return; }
      var elements = this.grid.getDirtyNodes(true); // verify they really changed
      if (elements && elements.length) {
        this.grid._layoutsNodesChange(elements);
        this.container.trigger('change', [elements]);
      }
      this.grid._saveInitial(); // we called, now reset initial values & dirty flags
    };
  
    GridStack.prototype._triggerAddEvent = function() {
      if (this.grid._batchMode) { return; }
      if (this.grid._addedNodes && this.grid._addedNodes.length > 0) {
        this.grid._layoutsNodesChange(this.grid._addedNodes);
        // prevent added nodes from also triggering 'change' event (which is called next)
        this.grid._addedNodes.forEach(function (n) { delete n._dirty; });
        this.container.trigger('added', [this.grid._addedNodes]);
        this.grid._addedNodes = [];
      }
    };
  
    GridStack.prototype._triggerRemoveEvent = function() {
      if (this.grid._batchMode) { return; }
      if (this.grid._removedNodes && this.grid._removedNodes.length > 0) {
        this.container.trigger('removed', [this.grid._removedNodes]);
        this.grid._removedNodes = [];
      }
    };
  
    GridStack.prototype._initStyles = function() {
      if (this._stylesId) {
        Utils.removeStylesheet(this._stylesId);
      }
      this._stylesId = 'gridstack-style-' + (Math.random() * 100000).toFixed();
      // insert style to parent (instead of 'head') to support WebComponent
      this._styles = Utils.createStylesheet(this._stylesId, this.container.get(0).parentNode);
      if (this._styles !== null) {
        this._styles._max = 0;
      }
    };
  
    GridStack.prototype._updateStyles = function(maxHeight) {
      if (this._styles === null || this._styles === undefined) {
        return;
      }
  
      var prefix = '.' + this.opts._class + ' .' + this.opts.itemClass;
      var self = this;
      var getHeight;
  
      if (maxHeight === undefined) {
        maxHeight = this._styles._max;
      }
  
      this._initStyles();
      this._updateContainerHeight();
      if (!this.opts.cellHeight) { // The rest will be handled by CSS
        return ;
      }
      if (this._styles._max !== 0 && maxHeight <= this._styles._max) { // Keep this._styles._max increasing
        return ;
      }
  
      if (!this.opts.verticalMargin || this.opts.cellHeightUnit === this.opts.verticalMarginUnit) {
        getHeight = function(nbRows, nbMargins) {
          return (self.opts.cellHeight * nbRows + self.opts.verticalMargin * nbMargins) +
            self.opts.cellHeightUnit;
        };
      } else {
        getHeight = function(nbRows, nbMargins) {
          if (!nbRows || !nbMargins) {
            return (self.opts.cellHeight * nbRows + self.opts.verticalMargin * nbMargins) +
              self.opts.cellHeightUnit;
          }
          return 'calc(' + ((self.opts.cellHeight * nbRows) + self.opts.cellHeightUnit) + ' + ' +
            ((self.opts.verticalMargin * nbMargins) + self.opts.verticalMarginUnit) + ')';
        };
      }
  
      if (this._styles._max === 0) {
        Utils.insertCSSRule(this._styles, prefix, 'min-height: ' + getHeight(1, 0) + ';', 0);
      }
  
      if (maxHeight > this._styles._max) {
        for (var i = this._styles._max; i < maxHeight; ++i) {
          Utils.insertCSSRule(this._styles,
            prefix + '[data-gs-height="' + (i + 1) + '"]',
            'height: ' + getHeight(i + 1, i) + ';',
            i
          );
          Utils.insertCSSRule(this._styles,
            prefix + '[data-gs-min-height="' + (i + 1) + '"]',
            'min-height: ' + getHeight(i + 1, i) + ';',
            i
          );
          Utils.insertCSSRule(this._styles,
            prefix + '[data-gs-max-height="' + (i + 1) + '"]',
            'max-height: ' + getHeight(i + 1, i) + ';',
            i
          );
          Utils.insertCSSRule(this._styles,
            prefix + '[data-gs-y="' + i + '"]',
            'top: ' + getHeight(i, i) + ';',
            i
          );
        }
        this._styles._max = maxHeight;
      }
    };
  
    GridStack.prototype._updateContainerHeight = function() {
      if (this.grid._batchMode) { return; }
      var height = this.grid.getGridHeight();
      // check for css min height. Each row is cellHeight + verticalMargin, until last one which has no margin below
      var cssMinHeight = parseInt(this.container.css('min-height'));
      if (cssMinHeight > 0) {
        var verticalMargin = this.opts.verticalMargin;
        var minHeight =  Math.round((cssMinHeight + verticalMargin) / (this.cellHeight() + verticalMargin));
        if (height < minHeight) {
          height = minHeight;
        }
      }
      this.container.attr('data-gs-current-height', height);
      if (!this.opts.cellHeight) {
        return ;
      }
      if (!this.opts.verticalMargin) {
        this.container.css('height', (height * (this.opts.cellHeight)) + this.opts.cellHeightUnit);
      } else if (this.opts.cellHeightUnit === this.opts.verticalMarginUnit) {
        this.container.css('height', (height * (this.opts.cellHeight + this.opts.verticalMargin) -
          this.opts.verticalMargin) + this.opts.cellHeightUnit);
      } else {
        this.container.css('height', 'calc(' + ((height * (this.opts.cellHeight)) + this.opts.cellHeightUnit) +
          ' + ' + ((height * (this.opts.verticalMargin - 1)) + this.opts.verticalMarginUnit) + ')');
      }
    };
  
    GridStack.prototype._setupRemovingTimeout = function(el) {
      var self = this;
      var node = $(el).data('_gridstack_node');
  
      if (node._removeTimeout || !self.opts.removable) {
        return;
      }
      node._removeTimeout = setTimeout(function() {
        el.addClass('grid-stack-item-removing');
        node._isAboutToRemove = true;
      }, self.opts.removeTimeout);
    };
  
    GridStack.prototype._clearRemovingTimeout = function(el) {
      var node = $(el).data('_gridstack_node');
  
      if (!node._removeTimeout) {
        return;
      }
      clearTimeout(node._removeTimeout);
      node._removeTimeout = null;
      el.removeClass('grid-stack-item-removing');
      node._isAboutToRemove = false;
    };
  
    GridStack.prototype._prepareElementsByNode = function(el, node) {
      var self = this;
  
      var cellWidth;
      var cellHeight;
  
      var dragOrResize = function(event, ui) {
        var x = Math.round(ui.position.left / cellWidth);
        var y = Math.floor((ui.position.top + cellHeight / 2) / cellHeight);
        var width;
        var height;
  
        if (event.type !== 'drag') {
          width = Math.round(ui.size.width / cellWidth);
          height = Math.round(ui.size.height / cellHeight);
        }
  
        if (event.type === 'drag') {
          var distance = ui.position.top - node._prevYPix;
          node._prevYPix = ui.position.top;
          Utils.updateScrollPosition(el[0], ui, distance);
          if (el.data('inTrashZone') || x < 0 || x >= self.grid.column || y < 0 ||
            (!self.grid.float && y > self.grid.getGridHeight())) {
            if (!node._temporaryRemoved) {
              if (self.opts.removable === true) {
                self._setupRemovingTimeout(el);
              }
  
              x = node._beforeDragX;
              y = node._beforeDragY;
  
              self.placeholder.detach();
              self.placeholder.hide();
              self.grid.removeNode(node);
              self._updateContainerHeight();
  
              node._temporaryRemoved = true;
            } else {
              return;
            }
          } else {
            self._clearRemovingTimeout(el);
  
            if (node._temporaryRemoved) {
              self.grid.addNode(node);
              self.placeholder
                .attr('data-gs-x', x)
                .attr('data-gs-y', y)
                .attr('data-gs-width', width)
                .attr('data-gs-height', height)
                .show();
              self.container.append(self.placeholder);
              node.el = self.placeholder;
              node._temporaryRemoved = false;
            }
          }
        } else if (event.type === 'resize')  {
          if (x < 0) {
            return;
          }
        }
        // width and height are undefined if not resizing
        var lastTriedWidth = width !== undefined ? width : node.lastTriedWidth;
        var lastTriedHeight = height !== undefined ? height : node.lastTriedHeight;
        if (!self.grid.canMoveNode(node, x, y, width, height) ||
          (node.lastTriedX === x && node.lastTriedY === y &&
          node.lastTriedWidth === lastTriedWidth && node.lastTriedHeight === lastTriedHeight)) {
          return;
        }
        node.lastTriedX = x;
        node.lastTriedY = y;
        node.lastTriedWidth = width;
        node.lastTriedHeight = height;
        self.grid.moveNode(node, x, y, width, height);
        self._updateContainerHeight();
  
        if (event.type === 'resize')  {
          $(event.target).trigger('gsresize', node);
        }
      };
  
      var onStartMoving = function(event, ui) {
        self.container.append(self.placeholder);
        var o = $(this);
        self.grid.cleanNodes();
        self.grid.beginUpdate(node);
        cellWidth = self.cellWidth();
        var strictCellHeight = self.cellHeight();
        // TODO: cellHeight = cellHeight() causes issue (i.e. remove strictCellHeight above) otherwise
        // when sizing up we jump almost right away to next size instead of half way there. Not sure
        // why as we don't use ceil() in many places but round() instead.
        cellHeight = self.container.height() / parseInt(self.container.attr('data-gs-current-height'));
        self.placeholder
          .attr('data-gs-x', o.attr('data-gs-x'))
          .attr('data-gs-y', o.attr('data-gs-y'))
          .attr('data-gs-width', o.attr('data-gs-width'))
          .attr('data-gs-height', o.attr('data-gs-height'))
          .show();
        node.el = self.placeholder;
        node._beforeDragX = node.x;
        node._beforeDragY = node.y;
        node._prevYPix = ui.position.top;
        var minHeight = (node.minHeight || 1);
        var verticalMargin = self.opts.verticalMargin;
  
        // mineHeight - Each row is cellHeight + verticalMargin, until last one which has no margin below
        self.dd.resizable(el, 'option', 'minWidth', cellWidth * (node.minWidth || 1));
        self.dd.resizable(el, 'option', 'minHeight', (strictCellHeight * minHeight) + (minHeight - 1) * verticalMargin);
  
        if (event.type === 'resizestart') {
          o.find('.grid-stack-item').trigger('resizestart');
        }
      };
  
      var onEndMoving = function(event, ui) {
        var o = $(this);
        if (!o.data('_gridstack_node')) {
          return;
        }
  
        // var forceNotify = false; what is the point of calling 'change' event with no data, when the 'removed' event is already called ?
        self.placeholder.detach();
        node.el = o;
        self.placeholder.hide();
  
        if (node._isAboutToRemove) {
          // forceNotify = true;
          var gridToNotify = el.data('_gridstack_node')._grid;
          gridToNotify._triggerRemoveEvent();
          el.removeData('_gridstack_node');
          el.remove();
        } else {
          self._clearRemovingTimeout(el);
          if (!node._temporaryRemoved) {
            Utils.removePositioningStyles(o);
            o
              .attr('data-gs-x', node.x)
              .attr('data-gs-y', node.y)
              .attr('data-gs-width', node.width)
              .attr('data-gs-height', node.height);
          } else {
            Utils.removePositioningStyles(o);
            o
              .attr('data-gs-x', node._beforeDragX)
              .attr('data-gs-y', node._beforeDragY)
              .attr('data-gs-width', node.width)
              .attr('data-gs-height', node.height);
            node.x = node._beforeDragX;
            node.y = node._beforeDragY;
            node._temporaryRemoved = false;
            self.grid.addNode(node);
          }
        }
        self._updateContainerHeight();
        self._triggerChangeEvent(/*forceNotify*/);
  
        self.grid.endUpdate();
  
        var nestedGrids = o.find('.grid-stack');
        if (nestedGrids.length && event.type === 'resizestop') {
          nestedGrids.each(function(index, el) {
            $(el).data('gridstack').onResizeHandler();
          });
          o.find('.grid-stack-item').trigger('resizestop');
          o.find('.grid-stack-item').trigger('gsresizestop');
        }
        if (event.type === 'resizestop') {
          self.container.trigger('gsresizestop', o);
        }
      };
  
      this.dd
        .draggable(el, {
          start: onStartMoving,
          stop: onEndMoving,
          drag: dragOrResize
        })
        .resizable(el, {
          start: onStartMoving,
          stop: onEndMoving,
          resize: dragOrResize
        });
  
      if (node.noMove || this.opts.disableDrag || this.opts.staticGrid) {
        this.dd.draggable(el, 'disable');
      }
  
      if (node.noResize || this.opts.disableResize || this.opts.staticGrid) {
        this.dd.resizable(el, 'disable');
      }
  
      this._writeAttr(el, node);
    };
  
    GridStack.prototype._prepareElement = function(el, triggerAddEvent) {
      triggerAddEvent = triggerAddEvent !== undefined ? triggerAddEvent : false;
      var self = this;
      el = $(el);
  
      el.addClass(this.opts.itemClass);
      var node = this._readAttr(el, {el: el, _grid: self});
      node = self.grid.addNode(node, triggerAddEvent);
      el.data('_gridstack_node', node);
  
      this._prepareElementsByNode(el, node);
    };
  
    /** call to write any default attributes back to element */
    GridStack.prototype._writeAttr = function(el, node) {
      el = $(el);
      node = node || {};
      // Note: passing null removes the attr in jquery
      if (node.x !== undefined) { el.attr('data-gs-x', node.x); }
      if (node.y !== undefined) { el.attr('data-gs-y', node.y); }
      if (node.width !== undefined) { el.attr('data-gs-width', node.width); }
      if (node.height !== undefined) { el.attr('data-gs-height', node.height); }
      if (node.autoPosition !== undefined) { el.attr('data-gs-auto-position', node.autoPosition ? true : null); }
      if (node.minWidth !== undefined) { el.attr('data-gs-min-width', node.minWidth); }
      if (node.maxWidth !== undefined) { el.attr('data-gs-max-width', node.maxWidth); }
      if (node.minHeight !== undefined) { el.attr('data-gs-min-height', node.minHeight); }
      if (node.maxHeight !== undefined) { el.attr('data-gs-max-height', node.maxHeight); }
      if (node.noResize !== undefined) { el.attr('data-gs-no-resize', node.noResize ? true : null); }
      if (node.noMove !== undefined) { el.attr('data-gs-no-move', node.noMove ? true : null); }
      if (node.locked !== undefined) { el.attr('data-gs-locked', node.locked ? true : null); }
      if (node.resizeHandles !== undefined) { el.attr('data-gs-resize-handles', node.resizeHandles); }
      if (node.id !== undefined) { el.attr('data-gs-id', node.id); }
    };
  
    /** call to write any default attributes back to element */
    GridStack.prototype._readAttr = function(el, node) {
      el = $(el);
      node = node || {};
      node.x = el.attr('data-gs-x');
      node.y = el.attr('data-gs-y');
      node.width = el.attr('data-gs-width');
      node.height = el.attr('data-gs-height');
      node.autoPosition = Utils.toBool(el.attr('data-gs-auto-position'));
      node.maxWidth = el.attr('data-gs-max-width');
      node.minWidth = el.attr('data-gs-min-width');
      node.maxHeight = el.attr('data-gs-max-height');
      node.minHeight = el.attr('data-gs-min-height');
      node.noResize = Utils.toBool(el.attr('data-gs-no-resize'));
      node.noMove = Utils.toBool(el.attr('data-gs-no-move'));
      node.locked = Utils.toBool(el.attr('data-gs-locked'));
      node.resizeHandles = el.attr('data-gs-resize-handles');
      node.id = el.attr('data-gs-id');
      return node;
    };
  
    GridStack.prototype.setAnimation = function(enable) {
      if (enable) {
        this.container.addClass('grid-stack-animate');
      } else {
        this.container.removeClass('grid-stack-animate');
      }
    };
  
    GridStack.prototype.addWidget = function(el, node, y, width, height, autoPosition, minWidth, maxWidth, minHeight, maxHeight, id) {
  
      // new way of calling with an object - make sure all items have been properly initialized
      if (node === undefined || typeof node === 'object') {
        // Tempting to initialize the passed in node with default and valid values, but this break knockout demos
        // as the actual value are filled in when _prepareElement() calls el.attr('data-gs-xyz) before adding the node.
        // node = this.grid._prepareNode(node);
        node = node || {};
      } else {
        // old legacy way of calling with items spelled out - call us back with single object instead (so we can properly initialized values)
        return this.addWidget(el, {x: node, y: y, width: width, height: height, autoPosition: autoPosition,
          minWidth: minWidth, maxWidth: maxWidth, minHeight: minHeight, maxHeight: maxHeight, id: id});
      }
  
      el = $(el);
      this._writeAttr(el, node);
      this.container.append(el);
      return this.makeWidget(el);
    };
  
    GridStack.prototype.makeWidget = function(el) {
      el = $(el);
      this._prepareElement(el, true);
      this._updateContainerHeight();
      this._triggerAddEvent();
      this._triggerChangeEvent(true); // trigger any other changes
  
      return el;
    };
  
    GridStack.prototype.willItFit = function(x, y, width, height, autoPosition) {
      var node = {x: x, y: y, width: width, height: height, autoPosition: autoPosition};
      return this.grid.canBePlacedWithRespectToHeight(node);
    };
  
    GridStack.prototype.removeWidget = function(el, detachNode) {
      detachNode = (detachNode === undefined ? true : detachNode);
      el = $(el);
      var node = el.data('_gridstack_node');
      // For Meteor support: https://github.com/gridstack/gridstack.js/pull/272
      if (!node) {
        node = this.grid.getNodeDataByDOMEl(el);
      }
  
      el.removeData('_gridstack_node');
      this.grid.removeNode(node, detachNode);
      this._triggerRemoveEvent();
      this._triggerChangeEvent(true); // trigger any other changes
    };
  
    GridStack.prototype.removeAll = function(detachNode) {
      if (detachNode !== false) {
        // remove our data structure before list gets emptied and DOM elements stay behind
        this.grid.nodes.forEach(function(node) { node.el.removeData('_gridstack_node') });
      }
      this.grid.removeAll(detachNode);
      this._triggerRemoveEvent();
    };
  
    GridStack.prototype.destroy = function(detachGrid) {
      $(window).off('resize', this.onResizeHandler);
      this.disable();
      if (detachGrid !== undefined && !detachGrid) {
        this.removeAll(false);
        this.container.removeData('gridstack');
      } else {
        this.container.remove();
      }
      Utils.removeStylesheet(this._stylesId);
      if (this.grid) {
        this.grid = null;
      }
    };
  
    GridStack.prototype.resizable = function(el, val) {
      var self = this;
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        node.noResize = !(val || false);
        if (node.noResize) {
          self.dd.resizable(el, 'disable');
        } else {
          self.dd.resizable(el, 'enable');
        }
      });
      return this;
    };
  
    GridStack.prototype.movable = function(el, val) {
      var self = this;
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        node.noMove = !(val || false);
        if (node.noMove) {
          self.dd.draggable(el, 'disable');
          el.removeClass('ui-draggable-handle');
        } else {
          self.dd.draggable(el, 'enable');
          el.addClass('ui-draggable-handle');
        }
      });
      return this;
    };
  
    GridStack.prototype.enableMove = function(doEnable, includeNewWidgets) {
      this.movable(this.container.children('.' + this.opts.itemClass), doEnable);
      if (includeNewWidgets) {
        this.opts.disableDrag = !doEnable;
      }
    };
  
    GridStack.prototype.enableResize = function(doEnable, includeNewWidgets) {
      this.resizable(this.container.children('.' + this.opts.itemClass), doEnable);
      if (includeNewWidgets) {
        this.opts.disableResize = !doEnable;
      }
    };
  
    GridStack.prototype.disable = function() {
      this.movable(this.container.children('.' + this.opts.itemClass), false);
      this.resizable(this.container.children('.' + this.opts.itemClass), false);
      this.container.trigger('disable');
    };
  
    GridStack.prototype.enable = function() {
      this.movable(this.container.children('.' + this.opts.itemClass), true);
      this.resizable(this.container.children('.' + this.opts.itemClass), true);
      this.container.trigger('enable');
    };
  
    GridStack.prototype.locked = function(el, val) {
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        node.locked = (val || false);
        el.attr('data-gs-locked', node.locked ? 'yes' : null);
      });
      return this;
    };
  
    GridStack.prototype.maxHeight = function(el, val) {
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        if (!isNaN(val)) {
          node.maxHeight = (val || false);
          el.attr('data-gs-max-height', val);
        }
      });
      return this;
    };
  
    GridStack.prototype.minHeight = function(el, val) {
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        if (!isNaN(val)) {
          node.minHeight = (val || false);
          el.attr('data-gs-min-height', val);
        }
      });
      return this;
    };
  
    GridStack.prototype.maxWidth = function(el, val) {
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        if (!isNaN(val)) {
          node.maxWidth = (val || false);
          el.attr('data-gs-max-width', val);
        }
      });
      return this;
    };
  
    GridStack.prototype.minWidth = function(el, val) {
      el = $(el);
      el.each(function(index, el) {
        el = $(el);
        var node = el.data('_gridstack_node');
        if (!node) { return; }
        if (!isNaN(val)) {
          node.minWidth = (val || false);
          el.attr('data-gs-min-width', val);
        }
      });
      return this;
    };
  
    GridStack.prototype._updateElement = function(el, callback) {
      el = $(el).first();
      var node = el.data('_gridstack_node');
      if (!node) { return; }
      var self = this;
  
      self.grid.cleanNodes();
      self.grid.beginUpdate(node);
  
      callback.call(this, el, node);
  
      self._updateContainerHeight();
      self._triggerChangeEvent();
  
      self.grid.endUpdate();
    };
  
    GridStack.prototype.resize = function(el, width, height) {
      this._updateElement(el, function(el, node) {
        width = (width !== null && width !== undefined) ? width : node.width;
        height = (height !== null && height !== undefined) ? height : node.height;
  
        this.grid.moveNode(node, node.x, node.y, width, height);
      });
    };
  
    GridStack.prototype.move = function(el, x, y) {
      this._updateElement(el, function(el, node) {
        x = (x !== null && x !== undefined) ? x : node.x;
        y = (y !== null && y !== undefined) ? y : node.y;
  
        this.grid.moveNode(node, x, y, node.width, node.height);
      });
    };
  
    GridStack.prototype.update = function(el, x, y, width, height) {
      this._updateElement(el, function(el, node) {
        x = (x !== null && x !== undefined) ? x : node.x;
        y = (y !== null && y !== undefined) ? y : node.y;
        width = (width !== null && width !== undefined) ? width : node.width;
        height = (height !== null && height !== undefined) ? height : node.height;
  
        this.grid.moveNode(node, x, y, width, height);
      });
    };
  
    /**
     * relayout grid items to reclaim any empty space
     */
    GridStack.prototype.compact = function() {
      if (this.grid.nodes.length === 0) { return; }
      this.batchUpdate();
      this.grid._sortNodes();
      var nodes = this.grid.nodes;
      this.grid.nodes = []; // pretend we have no nodes to conflict layout to start with...
      nodes.forEach(function(node) {
        if (!node.noMove && !node.locked) {
          node.autoPosition = true;
        }
        this.grid.addNode(node, false); // 'false' for add event trigger...
        node._dirty = true; // force attr update
      }, this);
      this.commit();
    };
  
    GridStack.prototype.verticalMargin = function(val, noUpdate) {
      if (val === undefined) {
        return this.opts.verticalMargin;
      }
  
      var heightData = Utils.parseHeight(val);
  
      if (this.opts.verticalMarginUnit === heightData.unit && this.opts.maxRow === heightData.height) {
        return ;
      }
      this.opts.verticalMarginUnit = heightData.unit;
      this.opts.verticalMargin = heightData.height;
  
      if (!noUpdate) {
        this._updateStyles();
      }
    };
  
    /** set/get the current cell height value */
    GridStack.prototype.cellHeight = function(val, noUpdate) {
      // getter - returns the opts stored height else compute it...
      if (val === undefined) {
        if (this.opts.cellHeight && this.opts.cellHeight !== 'auto') {
          return this.opts.cellHeight;
        }
        // compute the height taking margin into account (each row has margin other than last one)
        var o = this.container.children('.' + this.opts.itemClass).first();
        var height = o.attr('data-gs-height');
        var verticalMargin = this.opts.verticalMargin;
        return Math.round((o.outerHeight() - (height - 1) * verticalMargin) / height);
      }
  
      // setter - updates the cellHeight value if they changed
      var heightData = Utils.parseHeight(val);
      if (this.opts.cellHeightUnit === heightData.unit && this.opts.cellHeight === heightData.height) {
        return ;
      }
      this.opts.cellHeightUnit = heightData.unit;
      this.opts.cellHeight = heightData.height;
  
      if (!noUpdate) {
        this._updateStyles();
      }
    };
  
    GridStack.prototype.cellWidth = function() {
      // TODO: take margin into account ($horizontal_padding in .scss) to make cellHeight='auto' square ? (see 810-many-columns.html)
      return Math.round(this.container.outerWidth() / this.opts.column);
    };
  
    GridStack.prototype.getCellFromPixel = function(position, useOffset) {
      var containerPos = (useOffset !== undefined && useOffset) ?
        this.container.offset() : this.container.position();
      var relativeLeft = position.left - containerPos.left;
      var relativeTop = position.top - containerPos.top;
  
      var columnWidth = Math.floor(this.container.width() / this.opts.column);
      var rowHeight = Math.floor(this.container.height() / parseInt(this.container.attr('data-gs-current-height')));
  
      return {x: Math.floor(relativeLeft / columnWidth), y: Math.floor(relativeTop / rowHeight)};
    };
  
    GridStack.prototype.batchUpdate = function() {
      this.grid.batchUpdate();
    };
  
    GridStack.prototype.commit = function() {
      this.grid.commit();
      this._triggerRemoveEvent();
      this._triggerAddEvent();
      this._triggerChangeEvent();
    };
  
    GridStack.prototype.isAreaEmpty = function(x, y, width, height) {
      return this.grid.isAreaEmpty(x, y, width, height);
    };
  
    GridStack.prototype.setStatic = function(staticValue) {
      this.opts.staticGrid = (staticValue === true);
      this.enableMove(!staticValue);
      this.enableResize(!staticValue);
      this._setStaticClass();
    };
  
    GridStack.prototype._setStaticClass = function() {
      var staticClassName = 'grid-stack-static';
  
      if (this.opts.staticGrid === true) {
        this.container.addClass(staticClassName);
      } else {
        this.container.removeClass(staticClassName);
      }
    };
  
    /** called whenever a node is added or moved - updates the cached layouts */
    GridStackEngine.prototype._layoutsNodesChange = function(nodes) {
      if (!this._layouts || this._ignoreLayoutsNodeChange) return;
      // remove smaller layouts - we will re-generate those on the fly... larger ones need to update
      this._layouts.forEach(function(layout, column) {
        if (!layout || column === this.column) return;
        if (column < this.column) {
          this._layouts[column] = undefined;
        }
        else {
          // we save the original x,y,w (h isn't cached) to see what actually changed to propagate better.
          // Note: we don't need to check against out of bound scaling/moving as that will be done when using those cache values.
          nodes.forEach(function(node) {
            var n = layout.find(function(l) { return l._id === node._id });
            if (!n) return; // no cache for new nodes. Will use those values.
            var ratio = column / this.column;
            // Y changed, push down same amount
            // TODO: detect doing item 'swaps' will help instead of move (especially in 1 column mode)
            if (node.y !== node._origY) {
              n.y += (node.y - node._origY);
            }
            // X changed, scale from new position
            if (node.x !== node._origX) {
              n.x = Math.round(node.x * ratio);
            }
            // width changed, scale from new width
            if (node.width !== node._origW) {
              n.width = Math.round(node.width * ratio);
            }
            // ...height always carries over from cache
          }, this);
        }
      }, this);
    }
  
    /**
     * Called to scale the widget width & position up/down based on the column change.
     * Note we store previous layouts (especially original ones) to make it possible to go
     * from say 12 -> 1 -> 12 and get back to where we were.
     *
     * oldColumn: previous number of columns
     * column:    new column number
     * nodes?:    different sorted list (ex: DOM order) instead of current list
     */
    GridStackEngine.prototype._updateNodeWidths = function(oldColumn, column, nodes) {
      if (!this.nodes.length || oldColumn === column) { return; }
  
      // cache the current layout in case they want to go back (like 12 -> 1 -> 12) as it requires original data
      var copy = [this.nodes.length];
      this.nodes.forEach(function(n, i) {copy[i] = {x: n.x, y: n.y, width: n.width, _id: n._id}}); // only thing we change is x,y,w and id to find it back
      this._layouts = this._layouts || []; // use array to find larger quick
      this._layouts[oldColumn] = copy;
  
      // if we're going to 1 column and using DOM order rather than default sorting, then generate that layout
      if (column === 1 && nodes && nodes.length) {
        var top = 0;
        nodes.forEach(function(n) {
          n.x = 0;
          n.width = 1;
          n.y = Math.max(n.y, top);
          top = n.y + n.height;
        });
      } else {
        nodes = Utils.sort(this.nodes, -1, oldColumn); // current column reverse sorting so we can insert last to front (limit collision)
      }
  
      // see if we have cached previous layout.
      var cacheNodes = this._layouts[column] || [];
      // if not AND we are going up in size start with the largest layout as down-scaling is more accurate
      var lastIndex = this._layouts.length - 1;
      if (cacheNodes.length === 0 && column > oldColumn && column < lastIndex) {
        cacheNodes = this._layouts[lastIndex] || [];
        if (cacheNodes.length) {
          // pretend we came from that larger column by assigning those values as starting point
          oldColumn = lastIndex;
          cacheNodes.forEach(function(cacheNode) {
            var j = nodes.findIndex(function(n) {return n && n._id === cacheNode._id});
            if (j !== -1) {
              // still current, use cache info positions
              nodes[j].x = cacheNode.x;
              nodes[j].y = cacheNode.y;
              nodes[j].width = cacheNode.width;
            }
          });
          cacheNodes = []; // we still don't have new column cached data... will generate from larger one.
        }
      }
  
      // if we found cache re-use those nodes that are still current
      var newNodes = [];
      cacheNodes.forEach(function(cacheNode) {
        var j = nodes.findIndex(function(n) {return n && n._id === cacheNode._id});
        if (j !== -1) {
          // still current, use cache info positions
          nodes[j].x = cacheNode.x;
          nodes[j].y = cacheNode.y;
          nodes[j].width = cacheNode.width;
          newNodes.push(nodes[j]);
          nodes[j] = null; // erase it so we know what's left
        }
      });
      // ...and add any extra non-cached ones
      var ratio = column / oldColumn;
      nodes.forEach(function(node) {
        if (!node) return;
        node.x = (column === 1 ? 0 : Math.round(node.x * ratio));
        node.width = ((column === 1 || oldColumn === 1) ? 1 : (Math.round(node.width * ratio) || 1));
        newNodes.push(node);
      });
  
      // finally relayout them in reverse order (to get correct placement)
      newNodes = Utils.sort(newNodes, -1, column);
      this._ignoreLayoutsNodeChange = true;
      this.batchUpdate();
      this.nodes = []; // pretend we have no nodes to start with (we use same structures) to simplify layout
      newNodes.forEach(function(node) {
        this.addNode(node, false); // 'false' for add event trigger
        node._dirty = true; // force attr update
      }, this);
      this.commit();
      delete this._ignoreLayoutsNodeChange;
    }
  
    /** called to save initial position/size */
    GridStackEngine.prototype._saveInitial = function() {
      this.nodes.forEach(function(n) {
        n._origX = n.x;
        n._origY = n.y;
        n._origW = n.width;
        n._origH = n.height;
        delete n._dirty;
      });
    }
  
    /**
     * Modify number of columns in the grid. Will attempt to update existing widgets
     * to conform to new number of columns. Requires `gridstack-extra.css` or `gridstack-extra.min.css` for [1-11],
     * else you will need to generate correct CSS (see https://github.com/gridstack/gridstack.js#change-grid-columns)
     * @param column - Integer > 0 (default 12).
     * @param doNotPropagate if true existing widgets will not be updated (optional)
     */
    GridStack.prototype.setColumn = function(column, doNotPropagate) {
      if (this.opts.column === column) { return; }
      var oldColumn = this.opts.column;
  
      // if we go into 1 column mode (which happens if we're sized less than minWidth unless disableOneColumnMode is on)
      // then remember the original columns so we can restore.
      if (column === 1) {
        this._prevColumn = oldColumn;
      } else {
        delete this._prevColumn;
      }
  
      this.container.removeClass('grid-stack-' + oldColumn);
      this.container.addClass('grid-stack-' + column);
      this.opts.column = this.grid.column = column;
  
      if (doNotPropagate === true) { return; }
  
      // update the items now - see if the dom order nodes should be passed instead (else default to current list)
      var domNodes;
      if (this.opts.oneColumnModeDomSort && column === 1) {
        domNodes = [];
        this.container.children('.' + this.opts.itemClass).each(function(index, el) {
          var node = $(el).data('_gridstack_node');
          if (node) { domNodes.push(node); }
        });
        if (!domNodes.length) { domNodes = undefined; }
      }
      this.grid._updateNodeWidths(oldColumn, column, domNodes);
  
      // and trigger our event last...
      this.grid._ignoreLayoutsNodeChange = true;
      this._triggerChangeEvent();
      delete this.grid._ignoreLayoutsNodeChange;
    };
  
    GridStack.prototype.float = function(val) {
      // getter - returns the opts stored mode
      if (val === undefined) {
        return this.opts.float || false;
      }
      // setter - updates the mode and relayout if gravity is back on
      if (this.opts.float === val) { return; }
      this.opts.float = this.grid.float = val || false;
      if (!val) {
        this.grid._packNodes();
        this.grid._notify();
        this._triggerChangeEvent();
      }
    };
  
    // legacy method renames
    GridStack.prototype.setGridWidth = obsolete(GridStack.prototype.setColumn,
      'setGridWidth', 'setColumn', 'v0.5.3');
  
    scope.GridStackUI = GridStack;
  
    scope.GridStackUI.Utils = Utils;
    scope.GridStackUI.Engine = GridStackEngine;
    scope.GridStackUI.GridStackDragDropPlugin = GridStackDragDropPlugin;
  
    $.fn.gridstack = function(opts) {
      return this.each(function() {
        var o = $(this);
        if (!o.data('gridstack')) {
          o
            .data('gridstack', new GridStack(this, opts));
        }
      });
    };
  
    return scope.GridStackUI;
  });
  