text: // YUI3 File Picker module for moodle
  // Author: Dongsheng Cai <dongsheng@moodle.com>
  
  /**
   *
   * File Picker UI
   * =====
   * this.fpnode, contains reference to filepicker Node, non-empty if and only if rendered
   * this.api, stores the URL to make ajax request
   * this.mainui, YUI Panel
   * this.selectnode, contains reference to select-file Node
   * this.selectui, YUI Panel for selecting particular file
   * this.msg_dlg, YUI Panel for error or info message
   * this.process_dlg, YUI Panel for processing existing filename
   * this.treeview, YUI Treeview
   * this.viewmode, store current view mode
   * this.pathbar, reference to the Node with path bar
   * this.pathnode, a Node element representing one folder in a path bar (not attached anywhere, just used for template)
   * this.currentpath, the current path in the repository (or last requested path)
   *
   * Filepicker options:
   * =====
   * this.options.client_id, the instance id
   * this.options.contextid
   * this.options.itemid
   * this.options.repositories, stores all repositories displayed in file picker
   * this.options.formcallback
   *
   * Active repository options
   * =====
   * this.active_repo.id
   * this.active_repo.defaultreturntype
   * this.active_repo.nosearch
   * this.active_repo.norefresh
   * this.active_repo.nologin
   * this.active_repo.help
   * this.active_repo.manage
   *
   * Server responses
   * =====
   * this.filelist, cached filelist
   * this.pages
   * this.page
   * this.filepath, current path (each element of the array is a part of the breadcrumb)
   * this.logindata, cached login form
   */
  
  YUI.add('moodle-core_filepicker', function(Y) {
      /** help function to extract width/height style as a number, not as a string */
      Y.Node.prototype.getStylePx = function(attr) {
          var style = this.getStyle(attr);
          if (''+style == '0' || ''+style == '0px') {
              return 0;
          }
          var matches = style.match(/^([\d\.]+)px$/)
          if (matches && parseFloat(matches[1])) {
              return parseFloat(matches[1]);
          }
          return null;
      }
  
      /** if condition is met, the class is added to the node, otherwise - removed */
      Y.Node.prototype.addClassIf = function(className, condition) {
          if (condition) {
              this.addClass(className);
          } else {
              this.removeClass(className);
          }
          return this;
      }
  
      /** sets the width(height) of the node considering existing minWidth(minHeight) */
      Y.Node.prototype.setStyleAdv = function(stylename, value) {
          var stylenameCap = stylename.substr(0,1).toUpperCase() + stylename.substr(1, stylename.length-1).toLowerCase();
          this.setStyle(stylename, '' + Math.max(value, this.getStylePx('min'+stylenameCap)) + 'px')
          return this;
      }
  
      /** set image source to src, if there is preview, remember it in lazyloading.
       *  If there is a preview and it was already loaded, use it. */
      Y.Node.prototype.setImgSrc = function(src, realsrc, lazyloading) {
          if (realsrc) {
              if (M.core_filepicker.loadedpreviews[realsrc]) {
                  this.set('src', realsrc).addClass('realpreview');
                  return this;
              } else {
                  if (!this.get('id')) {
                      this.generateID();
                  }
                  lazyloading[this.get('id')] = realsrc;
              }
          }
          this.set('src', src);
          return this;
      }
  
      /**
       * Replaces the image source with preview. If the image is inside the treeview, we need
       * also to update the html property of corresponding YAHOO.widget.HTMLNode
       * @param array lazyloading array containing associations of imgnodeid->realsrc
       */
      Y.Node.prototype.setImgRealSrc = function(lazyloading) {
          if (this.get('id') && lazyloading[this.get('id')]) {
              var newsrc = lazyloading[this.get('id')];
              M.core_filepicker.loadedpreviews[newsrc] = true;
              this.set('src', newsrc).addClass('realpreview');
              delete lazyloading[this.get('id')];
              var treenode = this.ancestor('.fp-treeview')
              if (treenode && treenode.get('parentNode').treeview) {
                  treenode.get('parentNode').treeview.getRoot().refreshPreviews(this.get('id'), newsrc);
              }
          }
          return this;
      }
  
      /** scan TreeView to find which node contains image with id=imgid and replace it's html
       * with the new image source. */
      Y.YUI2.widget.Node.prototype.refreshPreviews = function(imgid, newsrc, regex) {
          if (!regex) {
              regex = new RegExp("<img\\s[^>]*id=\""+imgid+"\"[^>]*?(/?)>", "im");
          }
          if (this.expanded || this.isLeaf) {
              var html = this.getContentHtml();
              if (html && this.setHtml && regex.test(html)) {
                  var newhtml = this.html.replace(regex, "<img id=\""+imgid+"\" src=\""+newsrc+"\" class=\"realpreview\"$1>", html);
                  this.setHtml(newhtml);
                  return true;
              }
              if (!this.isLeaf && this.children) {
                  for(var c in this.children) {
                      if (this.children[c].refreshPreviews(imgid, newsrc, regex)) {
                          return true;
                      }
                  }
              }
          }
          return false;
      }
  
      /**
       * Displays a list of files (used by filepicker, filemanager) inside the Node
       *
       * @param array options
       *   viewmode : 1 - icons, 2 - tree, 3 - table
       *   appendonly : whether fileslist need to be appended instead of replacing the existing content
       *   filenode : Node element that contains template for displaying one file
       *   callback : On click callback. The element of the fileslist array will be passed as argument
       *   rightclickcallback : On right click callback (optional).
       *   callbackcontext : context where callbacks are executed
       *   sortable : whether content may be sortable (in table mode)
       *   dynload : allow dynamic load for tree view
       *   filepath : for pre-building of tree view - the path to the current directory in filepicker format
       *   treeview_dynload : callback to function to dynamically load the folder in tree view
       *   classnamecallback : callback to function that returns the class name for an element
       * @param array fileslist array of files to show, each array element may have attributes:
       *   title or fullname : file name
       *   shorttitle (optional) : display file name
       *   thumbnail : url of image
       *   icon : url of icon image
       *   thumbnail_width : width of thumbnail, default 90
       *   thumbnail_height : height of thumbnail, default 90
       *   thumbnail_alt : TODO not needed!
       *   description or thumbnail_title : alt text
       * @param array lazyloading : reference to the array with lazy loading images
       */
      Y.Node.prototype.fp_display_filelist = function(options, fileslist, lazyloading) {
          var viewmodeclassnames = {1:'fp-iconview', 2:'fp-treeview', 3:'fp-tableview'};
          var classname = viewmodeclassnames[options.viewmode];
          var scope = this;
          /** return whether file is a folder (different attributes in FileManager and FilePicker) */
          var file_is_folder = function(node) {
              if (node.children) {return true;}
              if (node.type && node.type == 'folder') {return true;}
              return false;
          };
          /** return the name of the file (different attributes in FileManager and FilePicker) */
          var file_get_filename = function(node) {
              return node.title ? node.title : node.fullname;
          };
          /** return display name of the file (different attributes in FileManager and FilePicker) */
          var file_get_displayname = function(node) {
              var displayname = node.shorttitle ? node.shorttitle : file_get_filename(node);
              return Y.Escape.html(displayname);
          };
          /** return file description (different attributes in FileManager and FilePicker) */
          var file_get_description = function(node) {
              var description = '';
              if (node.description) {
                  description = node.description;
              } else if (node.thumbnail_title) {
                  description = node.thumbnail_title;
              } else {
                  description = file_get_filename(node);
              }
              return Y.Escape.html(description);
          };
          /** help funciton for tree view */
          var build_tree = function(node, level) {
              // prepare file name with icon
              var el = Y.Node.create('<div/>');
              el.appendChild(options.filenode.cloneNode(true));
  
              el.one('.fp-filename').setContent(file_get_displayname(node));
              // TODO add tooltip with node.title or node.thumbnail_title
              var tmpnodedata = {className:options.classnamecallback(node)};
              el.get('children').addClass(tmpnodedata.className);
              if (node.icon) {
                  el.one('.fp-icon').appendChild(Y.Node.create('<img/>'));
                  el.one('.fp-icon img').setImgSrc(node.icon, node.realicon, lazyloading);
              }
              // create node
              tmpnodedata.html = el.getContent();
              var tmpNode = new Y.YUI2.widget.HTMLNode(tmpnodedata, level, false);
              if (node.dynamicLoadComplete) {
                  tmpNode.dynamicLoadComplete = true;
              }
              tmpNode.fileinfo = node;
              tmpNode.isLeaf = !file_is_folder(node);
              if (!tmpNode.isLeaf) {
                  if(node.expanded) {
                      tmpNode.expand();
                  }
                  tmpNode.path = node.path ? node.path : (node.filepath ? node.filepath : '');
                  for(var c in node.children) {
                      build_tree(node.children[c], tmpNode);
                  }
              }
          };
          /** initialize tree view */
          var initialize_tree_view = function() {
              var parentid = scope.one('.'+classname).get('id');
              // TODO MDL-32736 use YUI3 gallery TreeView
              scope.treeview = new Y.YUI2.widget.TreeView(parentid);
              if (options.dynload) {
                  scope.treeview.setDynamicLoad(Y.bind(options.treeview_dynload, options.callbackcontext), 1);
              }
              scope.treeview.singleNodeHighlight = true;
              if (options.filepath && options.filepath.length) {
                  // we just jumped from icon/details view, we need to show all parents
                  // we extract as much information as possible from filepath and filelist
                  // and send additional requests to retrieve siblings for parent folders
                  var mytree = {};
                  var mytreeel = null;
                  for (var i in options.filepath) {
                      if (mytreeel == null) {
                          mytreeel = mytree;
                      } else {
                          mytreeel.children = [{}];
                          mytreeel = mytreeel.children[0];
                      }
                      var pathelement = options.filepath[i];
                      mytreeel.path = pathelement.path;
                      mytreeel.title = pathelement.name;
                      mytreeel.icon = pathelement.icon;
                      mytreeel.dynamicLoadComplete = true; // we will call it manually
                      mytreeel.expanded = true;
                  }
                  mytreeel.children = fileslist;
                  build_tree(mytree, scope.treeview.getRoot());
                  // manually call dynload for parent elements in the tree so we can load other siblings
                  if (options.dynload) {
                      var root = scope.treeview.getRoot();
                      // Whether search results are currently displayed in the active repository in the filepicker.
                      // We do not want to load siblings of parent elements when displaying search tree results.
                      var isSearchResult = typeof options.callbackcontext.active_repo !== 'undefined' &&
                          options.callbackcontext.active_repo.issearchresult;
                      while (root && root.children && root.children.length) {
                          root = root.children[0];
                          if (root.path == mytreeel.path) {
                              root.origpath = options.filepath;
                              root.origlist = fileslist;
                          } else if (!root.isLeaf && root.expanded && !isSearchResult) {
                              Y.bind(options.treeview_dynload, options.callbackcontext)(root, null);
                          }
                      }
                  }
              } else {
                  // there is no path information, just display all elements as a list, without hierarchy
                  for(k in fileslist) {
                      build_tree(fileslist[k], scope.treeview.getRoot());
                  }
              }
              scope.treeview.subscribe('clickEvent', function(e){
                  e.node.highlight(false);
                  var callback = options.callback;
                  if (options.rightclickcallback && e.event.target &&
                          Y.Node(e.event.target).ancestor('.fp-treeview .fp-contextmenu', true)) {
                      callback = options.rightclickcallback;
                  }
                  Y.bind(callback, options.callbackcontext)(e, e.node.fileinfo);
                  Y.YUI2.util.Event.stopEvent(e.event)
              });
              // TODO MDL-32736 support right click
              /*if (options.rightclickcallback) {
                  scope.treeview.subscribe('dblClickEvent', function(e){
                      e.node.highlight(false);
                      Y.bind(options.rightclickcallback, options.callbackcontext)(e, e.node.fileinfo);
                  });
              }*/
              scope.treeview.draw();
          };
          /** formatting function for table view */
          var formatValue = function (o){
              if (o.data[''+o.column.key+'_f_s']) {return o.data[''+o.column.key+'_f_s'];}
              else if (o.data[''+o.column.key+'_f']) {return o.data[''+o.column.key+'_f'];}
              else if (o.value) {return o.value;}
              else {return '';}
          };
          /** formatting function for table view */
          var formatTitle = function(o) {
              var el = Y.Node.create('<div/>');
              el.appendChild(options.filenode.cloneNode(true)); // TODO not node but string!
              el.get('children').addClass(o.data['classname']);
              el.one('.fp-filename').setContent(o.value);
              if (o.data['icon']) {
                  el.one('.fp-icon').appendChild(Y.Node.create('<img/>'));
                  el.one('.fp-icon img').setImgSrc(o.data['icon'], o.data['realicon'], lazyloading);
              }
              if (options.rightclickcallback) {
                  el.get('children').addClass('fp-hascontextmenu');
              }
              // TODO add tooltip with o.data['title'] (o.value) or o.data['thumbnail_title']
              return el.getContent();
          }
  
          /**
           * Generate slave checkboxes based on toggleall's specification
           * @param {object} o An object reprsenting the record for the current row.
           * @return {html} The checkbox html
           */
          var formatCheckbox = function(o) {
              var el = Y.Node.create('<div/>');
  
              var checkbox = Y.Node.create('<input/>')
                  .setAttribute('type', 'checkbox')
                  .setAttribute('data-fieldtype', 'checkbox')
                  .setAttribute('data-fullname', o.data.fullname)
                  .setAttribute('data-action', 'toggle')
                  .setAttribute('data-toggle', 'slave')
                  .setAttribute('data-togglegroup', 'file-selections')
                  .setAttribute('data-toggle-selectall', M.util.get_string('selectall', 'moodle'))
                  .setAttribute('data-toggle-deselectall', M.util.get_string('deselectall', 'moodle'));
  
              var checkboxLabel = Y.Node.create('<label>')
                  .setHTML("Select file '" + o.data.fullname + "'")
                  .addClass('sr-only')
                  .setAttrs({
                      for: checkbox.generateID(),
                  });
  
              el.appendChild(checkbox);
              el.appendChild(checkboxLabel);
              return el.getContent();
          };
          /** sorting function for table view */
          var sortFoldersFirst = function(a, b, desc) {
              if (a.get('isfolder') && !b.get('isfolder')) {
                  return -1;
              }
              if (!a.get('isfolder') && b.get('isfolder')) {
                  return 1;
              }
              var aa = a.get(this.key), bb = b.get(this.key), dir = desc ? -1 : 1;
              return (aa > bb) ? dir : ((aa < bb) ? -dir : 0);
          }
          /** initialize table view */
          var initialize_table_view = function() {
              var cols = [
                  {key: "displayname", label: M.util.get_string('name', 'moodle'), allowHTML: true, formatter: formatTitle,
                      sortable: true, sortFn: sortFoldersFirst},
                  {key: "datemodified", label: M.util.get_string('lastmodified', 'moodle'), allowHTML: true, formatter: formatValue,
                      sortable: true, sortFn: sortFoldersFirst},
                  {key: "size", label: M.util.get_string('size', 'repository'), allowHTML: true, formatter: formatValue,
                      sortable: true, sortFn: sortFoldersFirst},
                  {key: "mimetype", label: M.util.get_string('type', 'repository'), allowHTML: true,
                      sortable: true, sortFn: sortFoldersFirst}
              ];
  
              // Generate a checkbox based on toggleall's specification
              var div = Y.Node.create('<div/>');
              var checkbox = Y.Node.create('<input/>')
                  .setAttribute('type', 'checkbox')
                  // .setAttribute('title', M.util.get_string('selectallornone', 'form'))
                  .setAttribute('data-action', 'toggle')
                  .setAttribute('data-toggle', 'master')
                  .setAttribute('data-togglegroup', 'file-selections');
  
              var checkboxLabel = Y.Node.create('<label>')
                  .setHTML(M.util.get_string('selectallornone', 'form'))
                  .addClass('sr-only')
                  .setAttrs({
                      for: checkbox.generateID(),
                  });
  
              div.appendChild(checkboxLabel);
              div.appendChild(checkbox);
  
              // Define the selector for the click event handler.
              var clickEventSelector = 'tr';
              // Enable the selectable checkboxes
              if (options.disablecheckboxes != undefined && !options.disablecheckboxes) {
                  clickEventSelector = 'tr td:not(:first-child)';
                  cols.unshift({
                      key: "",
                      label: div.getContent(),
                      allowHTML: true,
                      formatter: formatCheckbox,
                      sortable: false
                  });
              }
              scope.tableview = new Y.DataTable({columns: cols, data: fileslist});
              scope.tableview.delegate('click', function (e, tableview) {
                  var record = tableview.getRecord(e.currentTarget.get('id'));
                  if (record) {
                      var callback = options.callback;
                      if (options.rightclickcallback && e.target.ancestor('.fp-tableview .fp-contextmenu', true)) {
                          callback = options.rightclickcallback;
                      }
                      Y.bind(callback, this)(e, record.getAttrs());
                  }
              }, clickEventSelector, options.callbackcontext, scope.tableview);
  
              if (options.rightclickcallback) {
                  scope.tableview.delegate('contextmenu', function (e, tableview) {
                      var record = tableview.getRecord(e.currentTarget.get('id'));
                      if (record) { Y.bind(options.rightclickcallback, this)(e, record.getAttrs()); }
                  }, 'tr', options.callbackcontext, scope.tableview);
              }
          }
          /** append items in table view mode */
          var append_files_table = function() {
              if (options.appendonly) {
                  fileslist.forEach(function(el) {
                      this.tableview.data.add(el);
                  },scope);
              }
              scope.tableview.render(scope.one('.'+classname));
              scope.tableview.sortable = options.sortable ? true : false;
          };
          /** append items in tree view mode */
          var append_files_tree = function() {
              if (options.appendonly) {
                  var parentnode = scope.treeview.getRoot();
                  if (scope.treeview.getHighlightedNode()) {
                      parentnode = scope.treeview.getHighlightedNode();
                      if (parentnode.isLeaf) {parentnode = parentnode.parent;}
                  }
                  for (var k in fileslist) {
                      build_tree(fileslist[k], parentnode);
                  }
                  scope.treeview.draw();
              } else {
                  // otherwise files were already added in initialize_tree_view()
              }
          }
          /** append items in icon view mode */
          var append_files_icons = function() {
              parent = scope.one('.'+classname);
              for (var k in fileslist) {
                  var node = fileslist[k];
                  var element = options.filenode.cloneNode(true);
                  parent.appendChild(element);
                  element.addClass(options.classnamecallback(node));
                  var filenamediv = element.one('.fp-filename');
                  filenamediv.setContent(file_get_displayname(node));
                  var imgdiv = element.one('.fp-thumbnail'), width, height, src;
                  if (node.thumbnail) {
                      width = node.thumbnail_width ? node.thumbnail_width : 90;
                      height = node.thumbnail_height ? node.thumbnail_height : 90;
                      src = node.thumbnail;
                  } else {
                      width = 16;
                      height = 16;
                      src = node.icon;
                  }
                  filenamediv.setStyleAdv('width', width);
                  imgdiv.setStyleAdv('width', width).setStyleAdv('height', height);
                  var img = Y.Node.create('<img/>').setAttrs({
                          title: file_get_description(node),
                          alt: Y.Escape.html(node.thumbnail_alt ? node.thumbnail_alt : file_get_filename(node))}).
                      setStyle('maxWidth', ''+width+'px').
                      setStyle('maxHeight', ''+height+'px');
                  img.setImgSrc(src, node.realthumbnail, lazyloading);
                  imgdiv.appendChild(img);
                  element.on('click', function(e, nd) {
                      if (options.rightclickcallback && e.target.ancestor('.fp-iconview .fp-contextmenu', true)) {
                          Y.bind(options.rightclickcallback, this)(e, nd);
                      } else {
                          Y.bind(options.callback, this)(e, nd);
                      }
                  }, options.callbackcontext, node);
                  if (options.rightclickcallback) {
                      element.on('contextmenu', options.rightclickcallback, options.callbackcontext, node);
                  }
              }
          }
  
          // Notify the user if any of the files has a problem status.
          var problemFiles = [];
          fileslist.forEach(function(file) {
              if (!file_is_folder(file) && file.hasOwnProperty('status') && file.status != 0) {
                  problemFiles.push(file);
              }
          });
          if (problemFiles.length > 0) {
              require(["core/notification", "core/str"], function(Notification, Str) {
                  problemFiles.forEach(function(problemFile) {
                      Str.get_string('storedfilecannotreadfile', 'error', problemFile.fullname).then(function(string) {
                          Notification.addNotification({
                              message: string,
                              type: "error"
                          });
                          return;
                      }).catch(Notification.exception);
                  });
              });
          }
  
          // If table view, need some additional properties
          // before passing fileslist to the YUI tableview
          if (options.viewmode == 3) {
              fileslist.forEach(function(el) {
                  el.displayname = file_get_displayname(el);
                  el.isfolder = file_is_folder(el);
                  el.classname = options.classnamecallback(el);
              }, scope);
          }
  
          // initialize files view
          if (!options.appendonly) {
              var parent = Y.Node.create('<div/>').addClass(classname);
              this.setContent('').appendChild(parent);
              parent.generateID();
              if (options.viewmode == 2) {
                  initialize_tree_view();
              } else if (options.viewmode == 3) {
                  initialize_table_view();
              } else {
                  // nothing to initialize for icon view
              }
          }
  
          // append files to the list
          if (options.viewmode == 2) {
              append_files_tree();
          } else if (options.viewmode == 3) {
              append_files_table();
          } else {
              append_files_icons();
          }
  
      }
  }, '@VERSION@', {
      requires:['base', 'node', 'yui2-treeview', 'panel', 'cookie', 'datatable', 'datatable-sort']
  });
  
  M.core_filepicker = M.core_filepicker || {};
  
  /**
   * instances of file pickers used on page
   */
  M.core_filepicker.instances = M.core_filepicker.instances || {};
  M.core_filepicker.active_filepicker = null;
  
  /**
   * HTML Templates to use in FilePicker
   */
  M.core_filepicker.templates = M.core_filepicker.templates || {};
  
  /**
   * Array of image sources for real previews (realicon or realthumbnail) that are already loaded
   */
  M.core_filepicker.loadedpreviews = M.core_filepicker.loadedpreviews || {};
  
  /**
  * Set selected file info
  *
  * @param object file info
  */
  M.core_filepicker.select_file = function(file) {
      M.core_filepicker.active_filepicker.select_file(file);
  }
  
  /**
   * Init and show file picker
   */
  M.core_filepicker.show = function(Y, options) {
      if (!M.core_filepicker.instances[options.client_id]) {
          M.core_filepicker.init(Y, options);
      }
      M.core_filepicker.instances[options.client_id].options.formcallback = options.formcallback;
      M.core_filepicker.instances[options.client_id].show();
  };
  
  M.core_filepicker.set_templates = function(Y, templates) {
      for (var templid in templates) {
          M.core_filepicker.templates[templid] = templates[templid];
      }
  }
  
  /**
   * Add new file picker to current instances
   */
  M.core_filepicker.init = function(Y, options) {
      var FilePickerHelper = function(options) {
          FilePickerHelper.superclass.constructor.apply(this, arguments);
      };
  
      FilePickerHelper.NAME = "FilePickerHelper";
      FilePickerHelper.ATTRS = {
          options: {},
          lang: {}
      };
  
      Y.extend(FilePickerHelper, Y.Base, {
          api: M.cfg.wwwroot+'/repository/repository_ajax.php',
          cached_responses: {},
          waitinterval : null, // When the loading template is being displayed and its animation is running this will be an interval instance.
          initializer: function(options) {
              this.options = options;
              if (!this.options.savepath) {
                  this.options.savepath = '/';
              }
          },
  
          destructor: function() {
          },
  
          request: function(args, redraw) {
              var api = (args.api ? args.api : this.api) + '?action='+args.action;
              var params = {};
              var scope = args['scope'] ? args['scope'] : this;
              params['repo_id']=args.repository_id;
              params['p'] = args.path?args.path:'';
              params['page'] = args.page?args.page:'';
              params['env']=this.options.env;
              // the form element only accept certain file types
              params['accepted_types']=this.options.accepted_types;
              params['sesskey'] = M.cfg.sesskey;
              params['client_id'] = args.client_id;
              params['itemid'] = this.options.itemid?this.options.itemid:0;
              params['maxbytes'] = this.options.maxbytes?this.options.maxbytes:-1;
              // The unlimited value of areamaxbytes is -1, it is defined by FILE_AREA_MAX_BYTES_UNLIMITED.
              params['areamaxbytes'] = this.options.areamaxbytes ? this.options.areamaxbytes : -1;
              if (this.options.context && this.options.context.id) {
                  params['ctx_id'] = this.options.context.id;
              }
              if (args['params']) {
                  for (i in args['params']) {
                      params[i] = args['params'][i];
                  }
              }
              if (args.action == 'upload') {
                  var list = [];
                  for(var k in params) {
                      var value = params[k];
                      if(value instanceof Array) {
                          for(var i in value) {
                              list.push(k+'[]='+value[i]);
                          }
                      } else {
                          list.push(k+'='+value);
                      }
                  }
                  params = list.join('&');
              } else {
                  params = build_querystring(params);
              }
              var cfg = {
                  method: 'POST',
                  on: {
                      complete: function(id,o,p) {
                          var data = null;
                          try {
                              data = Y.JSON.parse(o.responseText);
                          } catch(e) {
                              if (o && o.status && o.status > 0) {
                                  Y.use('moodle-core-notification-exception', function() {
                                      return new M.core.exception(e);
                                  });
                                  return;
                              }
                          }
                          // error checking
                          if (data && data.error) {
                              Y.use('moodle-core-notification-ajaxexception', function () {
                                  return new M.core.ajaxException(data);
                              });
                              this.fpnode.one('.fp-content').setContent('');
                              return;
                          } else {
                              if (data.msg) {
                                  scope.print_msg(data.msg, 'info');
                              }
                              // cache result if applicable
                              if (args.action != 'upload' && data.allowcaching) {
                                  scope.cached_responses[params] = data;
                              }
                              // invoke callback
                              args.callback(id,data,p);
                          }
                      }
                  },
                  arguments: {
                      scope: scope
                  },
                  headers: {
                      'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
                  },
                  data: params,
                  context: this
              };
              if (args.form) {
                  cfg.form = args.form;
              }
              // check if result of the same request has been already cached. If not, request it
              // (never applicable in case of form submission and/or upload action):
              if (!args.form && args.action != 'upload' && scope.cached_responses[params]) {
                  args.callback(null, scope.cached_responses[params], {scope: scope})
              } else {
                  Y.io(api, cfg);
                  if (redraw) {
                      this.wait();
                  }
              }
          },
          /** displays the dialog and processes rename/overwrite if there is a file with the same name in the same filearea*/
          process_existing_file: function(data) {
              var scope = this;
              var handleOverwrite = function(e) {
                  // overwrite
                  e.preventDefault();
                  var data = this.process_dlg.dialogdata;
                  var params = {}
                  params['existingfilename'] = data.existingfile.filename;
                  params['existingfilepath'] = data.existingfile.filepath;
                  params['newfilename'] = data.newfile.filename;
                  params['newfilepath'] = data.newfile.filepath;
                  this.hide_header();
                  this.request({
                      'params': params,
                      'scope': this,
                      'action':'overwrite',
                      'path': '',
                      'client_id': this.options.client_id,
                      'repository_id': this.active_repo.id,
                      'callback': function(id, o, args) {
                          scope.hide();
                          // Add an arbitrary parameter to the URL to force browsers to re-load the new image even
                          // if the file name has not changed.
                          var urlimage = data.existingfile.url + "?time=" + (new Date()).getTime();
                          if (scope.options.editor_target && scope.options.env == 'editor') {
                              // editor needs to update url
                              scope.options.editor_target.value = urlimage;
                              scope.options.editor_target.dispatchEvent(new Event('change'), {'bubbles': true});
                          }
                          var fileinfo = {'client_id':scope.options.client_id,
                              'url': urlimage,
                              'file': data.existingfile.filename};
                          var formcallback_scope = scope.options.magicscope ? scope.options.magicscope : scope;
                          scope.options.formcallback.apply(formcallback_scope, [fileinfo]);
                      }
                  }, true);
              }
              var handleRename = function(e) {
                  // inserts file with the new name
                  e.preventDefault();
                  var scope = this;
                  var data = this.process_dlg.dialogdata;
                  if (scope.options.editor_target && scope.options.env == 'editor') {
                      scope.options.editor_target.value = data.newfile.url;
                      scope.options.editor_target.dispatchEvent(new Event('change'), {'bubbles': true});
                  }
                  scope.hide();
                  var formcallback_scope = scope.options.magicscope ? scope.options.magicscope : scope;
                  var fileinfo = {'client_id':scope.options.client_id,
                                  'url':data.newfile.url,
                                  'file':data.newfile.filename};
                  scope.options.formcallback.apply(formcallback_scope, [fileinfo]);
              }
              var handleCancel = function(e) {
                  // Delete tmp file
                  e.preventDefault();
                  var params = {};
                  params['newfilename'] = this.process_dlg.dialogdata.newfile.filename;
                  params['newfilepath'] = this.process_dlg.dialogdata.newfile.filepath;
                  this.request({
                      'params': params,
                      'scope': this,
                      'action':'deletetmpfile',
                      'path': '',
                      'client_id': this.options.client_id,
                      'repository_id': this.active_repo.id,
                      'callback': function(id, o, args) {
                          // let it be in background, from user point of view nothing is happenning
                      }
                  }, false);
                  this.process_dlg.hide();
                  this.selectui.hide();
              }
              if (!this.process_dlg) {
                  this.process_dlg_node = Y.Node.create(M.core_filepicker.templates.processexistingfile);
                  var node = this.process_dlg_node;
                  node.generateID();
                  this.process_dlg = new M.core.dialogue({
                      draggable    : true,
                      bodyContent  : node,
                      headerContent: M.util.get_string('fileexistsdialogheader', 'repository'),
                      centered     : true,
                      modal        : true,
                      visible      : false,
                      zIndex       : this.options.zIndex
                  });
                  node.one('.fp-dlg-butoverwrite').on('click', handleOverwrite, this);
                  node.one('.fp-dlg-butrename').on('click', handleRename, this);
                  node.one('.fp-dlg-butcancel').on('click', handleCancel, this);
                  if (this.options.env == 'editor') {
                      node.one('.fp-dlg-text').setContent(M.util.get_string('fileexistsdialog_editor', 'repository'));
                  } else {
                      node.one('.fp-dlg-text').setContent(M.util.get_string('fileexistsdialog_filemanager', 'repository'));
                  }
              }
              this.selectnode.removeClass('loading');
              this.process_dlg.dialogdata = data;
              this.process_dlg_node.one('.fp-dlg-butrename').setContent(M.util.get_string('renameto', 'repository', data.newfile.filename));
              this.process_dlg.show();
          },
          /** displays error instead of filepicker contents */
          display_error: function(errortext, errorcode) {
              this.fpnode.one('.fp-content').setContent(M.core_filepicker.templates.error);
              this.fpnode.one('.fp-content .fp-error').
                  addClass(errorcode).
                  setContent(Y.Escape.html(errortext));
          },
          /** displays message in a popup */
          print_msg: function(msg, type) {
              var header = M.util.get_string('error', 'moodle');
              if (type != 'error') {
                  type = 'info'; // one of only two types excepted
                  header = M.util.get_string('info', 'moodle');
              }
              if (!this.msg_dlg) {
                  this.msg_dlg_node = Y.Node.create(M.core_filepicker.templates.message);
                  this.msg_dlg_node.generateID();
  
                  this.msg_dlg = new M.core.dialogue({
                      draggable    : true,
                      bodyContent  : this.msg_dlg_node,
                      centered     : true,
                      modal        : true,
                      visible      : false,
                      zIndex       : this.options.zIndex
                  });
                  this.msg_dlg_node.one('.fp-msg-butok').on('click', function(e) {
                      e.preventDefault();
                      this.msg_dlg.hide();
                  }, this);
              }
  
              this.msg_dlg.set('headerContent', header);
              this.msg_dlg_node.removeClass('fp-msg-info').removeClass('fp-msg-error').addClass('fp-msg-'+type)
              this.msg_dlg_node.one('.fp-msg-text').setContent(Y.Escape.html(msg));
              this.msg_dlg.show();
          },
          view_files: function(appenditems) {
              this.viewbar_set_enabled(true);
              this.print_path();
              /*if ((appenditems == null) && (!this.filelist || !this.filelist.length) && !this.active_repo.hasmorepages) {
               // TODO do it via classes and adjust for each view mode!
                  // If there are no items and no next page, just display status message and quit
                  this.display_error(M.util.get_string('nofilesavailable', 'repository'), 'nofilesavailable');
                  return;
              }*/
              if (this.viewmode == 2) {
                  this.view_as_list(appenditems);
              } else if (this.viewmode == 3) {
                  this.view_as_table(appenditems);
              } else {
                  this.view_as_icons(appenditems);
              }
              this.fpnode.one('.fp-content').setAttribute('tabindex', '0');
              this.fpnode.one('.fp-content').focus();
              // display/hide the link for requesting next page
              if (!appenditems && this.active_repo.hasmorepages) {
                  if (!this.fpnode.one('.fp-content .fp-nextpage')) {
                      this.fpnode.one('.fp-content').append(M.core_filepicker.templates.nextpage);
                  }
                  this.fpnode.one('.fp-content .fp-nextpage').one('a,button').on('click', function(e) {
                      e.preventDefault();
                      this.fpnode.one('.fp-content .fp-nextpage').addClass('loading');
                      this.request_next_page();
                  }, this);
              }
              if (!this.active_repo.hasmorepages && this.fpnode.one('.fp-content .fp-nextpage')) {
                  this.fpnode.one('.fp-content .fp-nextpage').remove();
              }
              if (this.fpnode.one('.fp-content .fp-nextpage')) {
                  this.fpnode.one('.fp-content .fp-nextpage').removeClass('loading');
              }
              this.content_scrolled();
          },
          content_scrolled: function(e) {
              setTimeout(Y.bind(function() {
                  if (this.processingimages) {
                      return;
                  }
                  this.processingimages = true;
                  var scope = this,
                      fpcontent = this.fpnode.one('.fp-content'),
                      fpcontenty = fpcontent.getY(),
                      fpcontentheight = fpcontent.getStylePx('height'),
                      nextpage = fpcontent.one('.fp-nextpage'),
                      is_node_visible = function(node) {
                          var offset = node.getY()-fpcontenty;
                          if (offset <= fpcontentheight && (offset >=0 || offset+node.getStylePx('height')>=0)) {
                              return true;
                          }
                          return false;
                      };
                  // automatically load next page when 'more' link becomes visible
                  if (nextpage && !nextpage.hasClass('loading') && is_node_visible(nextpage)) {
                      nextpage.one('a,button').simulate('click');
                  }
                  // replace src for visible images that need to be lazy-loaded
                  if (scope.lazyloading) {
                      fpcontent.all('img').each( function(node) {
                          if (node.get('id') && scope.lazyloading[node.get('id')] && is_node_visible(node)) {
                              node.setImgRealSrc(scope.lazyloading);
                          }
                      });
                  }
                  this.processingimages = false;
              }, this), 200)
          },
          treeview_dynload: function(node, cb) {
              var retrieved_children = {};
              if (node.children) {
                  for (var i in node.children) {
                      retrieved_children[node.children[i].path] = node.children[i];
                  }
              }
              this.request({
                  action:'list',
                  client_id: this.options.client_id,
                  repository_id: this.active_repo.id,
                  path:node.path?node.path:'',
                  page:node.page?args.page:'',
                  scope:this,
                  callback: function(id, obj, args) {
                      var list = obj.list;
                      var scope = args.scope;
                      // check that user did not leave the view mode before recieving this response
                      if (!(scope.active_repo.id == obj.repo_id && scope.viewmode == 2 && node && node.getChildrenEl())) {
                          return;
                      }
                      if (cb != null) { // (in manual mode do not update current path)
                          scope.viewbar_set_enabled(true);
                          scope.parse_repository_options(obj);
                      }
                      node.highlight(false);
                      node.origlist = obj.list ? obj.list : null;
                      node.origpath = obj.path ? obj.path : null;
                      node.children = [];
                      for(k in list) {
                          if (list[k].children && retrieved_children[list[k].path]) {
                              // if this child is a folder and has already been retrieved
                              node.children[node.children.length] = retrieved_children[list[k].path];
                          } else {
                              // append new file to the list
                              scope.view_as_list([list[k]]);
                          }
                      }
                      if (cb == null) {
                          node.refresh();
                      } else {
                          // invoke callback requested by TreeView component
                          cb();
                      }
                      scope.content_scrolled();
                  }
              }, false);
          },
         classnamecallback : function(node) {
              var classname = '';
              if (node.children) {
                  classname = classname + ' fp-folder';
              }
              if (node.isref) {
                  classname = classname + ' fp-isreference';
              }
              if (node.iscontrolledlink) {
                  classname = classname + ' fp-iscontrolledlink';
              }
              if (node.refcount) {
                  classname = classname + ' fp-hasreferences';
              }
              if (node.originalmissing) {
                  classname = classname + ' fp-originalmissing';
              }
              return Y.Lang.trim(classname);
          },
          /** displays list of files in tree (list) view mode. If param appenditems is specified,
           * appends those items to the end of the list. Otherwise (default behaviour)
           * clears the contents and displays the items from this.filelist */
          view_as_list: function(appenditems) {
              var list = (appenditems != null) ? appenditems : this.filelist;
              this.viewmode = 2;
              if (!this.filelist || this.filelist.length==0 && (!this.filepath || !this.filepath.length)) {
                  this.display_error(M.util.get_string('nofilesavailable', 'repository'), 'nofilesavailable');
                  return;
              }
  
              var element_template = Y.Node.create(M.core_filepicker.templates.listfilename);
              var options = {
                  viewmode : this.viewmode,
                  appendonly : (appenditems != null),
                  filenode : element_template,
                  callbackcontext : this,
                  callback : function(e, node) {
                      // TODO MDL-32736 e is not an event here but an object with properties 'event' and 'node'
                      if (!node.children) {
                          if (e.node.parent && e.node.parent.origpath) {
                              // set the current path
                              this.filepath = e.node.parent.origpath;
                              this.filelist = e.node.parent.origlist;
                              this.print_path();
                          }
                          this.select_file(node);
                      } else {
                          // save current path and filelist (in case we want to jump to other viewmode)
                          this.filepath = e.node.origpath;
                          this.filelist = e.node.origlist;
                          this.currentpath = e.node.path;
                          this.print_path();
                          this.content_scrolled();
                      }
                  },
                  classnamecallback : this.classnamecallback,
                  dynload : this.active_repo.dynload,
                  filepath : this.filepath,
                  treeview_dynload : this.treeview_dynload
              };
              this.fpnode.one('.fp-content').fp_display_filelist(options, list, this.lazyloading);
          },
          /** displays list of files in icon view mode. If param appenditems is specified,
           * appends those items to the end of the list. Otherwise (default behaviour)
           * clears the contents and displays the items from this.filelist */
          view_as_icons: function(appenditems) {
              this.viewmode = 1;
              var list = (appenditems != null) ? appenditems : this.filelist;
              var element_template = Y.Node.create(M.core_filepicker.templates.iconfilename);
              if ((appenditems == null) && (!this.filelist || !this.filelist.length)) {
                  this.display_error(M.util.get_string('nofilesavailable', 'repository'), 'nofilesavailable');
                  return;
              }
              var options = {
                  viewmode : this.viewmode,
                  appendonly : (appenditems != null),
                  filenode : element_template,
                  callbackcontext : this,
                  callback : function(e, node) {
                      if (e.preventDefault) {
                          e.preventDefault();
                      }
                      if(node.children) {
                          if (this.active_repo.dynload) {
                              this.list({'path':node.path});
                          } else {
                              this.filelist = node.children;
                              this.view_files();
                          }
                      } else {
                          this.select_file(node);
                      }
                  },
                  classnamecallback : this.classnamecallback
              };
              this.fpnode.one('.fp-content').fp_display_filelist(options, list, this.lazyloading);
          },
          /** displays list of files in table view mode. If param appenditems is specified,
           * appends those items to the end of the list. Otherwise (default behaviour)
           * clears the contents and displays the items from this.filelist */
          view_as_table: function(appenditems) {
              this.viewmode = 3;
              var list = (appenditems != null) ? appenditems : this.filelist;
              if (!appenditems && (!this.filelist || this.filelist.length==0) && !this.active_repo.hasmorepages) {
                  this.display_error(M.util.get_string('nofilesavailable', 'repository'), 'nofilesavailable');
                  return;
              }
              var element_template = Y.Node.create(M.core_filepicker.templates.listfilename);
              var options = {
                  viewmode : this.viewmode,
                  appendonly : (appenditems != null),
                  filenode : element_template,
                  callbackcontext : this,
                  sortable : !this.active_repo.hasmorepages,
                  callback : function(e, node) {
                      if (e.preventDefault) {e.preventDefault();}
                      if (node.children) {
                          if (this.active_repo.dynload) {
                              this.list({'path':node.path});
                          } else {
                              this.filelist = node.children;
                              this.view_files();
                          }
                      } else {
                          this.select_file(node);
                      }
                  },
                  classnamecallback : this.classnamecallback
              };
              this.fpnode.one('.fp-content').fp_display_filelist(options, list, this.lazyloading);
          },
          /** If more than one page available, requests and displays the files from the next page */
          request_next_page: function() {
              if (!this.active_repo.hasmorepages || this.active_repo.nextpagerequested) {
                  // nothing to load
                  return;
              }
              this.active_repo.nextpagerequested = true;
              var nextpage = this.active_repo.page+1;
              var args = {
                  page: nextpage,
                  repo_id: this.active_repo.id
              };
              var action = this.active_repo.issearchresult ? 'search' : 'list';
              this.request({
                  path: this.currentpath,
                  scope: this,
                  action: action,
                  client_id: this.options.client_id,
                  repository_id: args.repo_id,
                  params: args,
                  callback: function(id, obj, args) {
                      var scope = args.scope;
                      // Check that we are still in the same repository and are expecting this page. We have no way
                      // to compare the requested page and the one returned, so we assume that if the last chunk
                      // of the breadcrumb is similar, then we probably are on the same page.
                      var samepage = true;
                      if (obj.path && scope.filepath) {
                          var pathbefore = scope.filepath[scope.filepath.length-1];
                          var pathafter = obj.path[obj.path.length-1];
                          if (pathbefore.path != pathafter.path) {
                              samepage = false;
                          }
                      }
                      if (scope.active_repo.hasmorepages && obj.list && obj.page &&
                              obj.repo_id == scope.active_repo.id &&
                              obj.page == scope.active_repo.page+1 && samepage) {
                          scope.parse_repository_options(obj, true);
                          scope.view_files(obj.list)
                      }
                  }
              }, false);
          },
          select_file: function(args) {
              var argstitle = args.shorttitle ? args.shorttitle : args.title;
              // Limit the string length so it fits nicely on mobile devices
              var titlelength = 30;
              if (argstitle.length > titlelength) {
                  argstitle = argstitle.substring(0, titlelength) + '...';
              }
              Y.one('#fp-file_label_'+this.options.client_id).setContent(Y.Escape.html(M.util.get_string('select', 'repository')+' '+argstitle));
              this.selectui.show();
              Y.one('#'+this.selectnode.get('id')).focus();
              var client_id = this.options.client_id;
              var selectnode = this.selectnode;
              var return_types = this.options.repositories[this.active_repo.id].return_types;
              selectnode.removeClass('loading');
              selectnode.one('.fp-saveas input').set('value', args.title);
  
              var imgnode = Y.Node.create('<img/>').
                  set('src', args.realthumbnail ? args.realthumbnail : args.thumbnail).
                  setStyle('maxHeight', ''+(args.thumbnail_height ? args.thumbnail_height : 90)+'px').
                  setStyle('maxWidth', ''+(args.thumbnail_width ? args.thumbnail_width : 90)+'px');
              selectnode.one('.fp-thumbnail').setContent('').appendChild(imgnode);
  
              // filelink is the array of file-link-types available for this repository in this env
              var filelinktypes = [2/*FILE_INTERNAL*/,1/*FILE_EXTERNAL*/,4/*FILE_REFERENCE*/,8/*FILE_CONTROLLED_LINK*/];
              var filelink = {}, firstfilelink = null, filelinkcount = 0;
              for (var i in filelinktypes) {
                  var allowed = (return_types & filelinktypes[i]) &&
                      (this.options.return_types & filelinktypes[i]);
                  if (filelinktypes[i] == 1/*FILE_EXTERNAL*/ && !this.options.externallink && this.options.env == 'editor') {
                      // special configuration setting 'repositoryallowexternallinks' may prevent
                      // using external links in editor environment
                      allowed = false;
                  }
                  filelink[filelinktypes[i]] = allowed;
                  firstfilelink = (firstfilelink==null && allowed) ? filelinktypes[i] : firstfilelink;
                  filelinkcount += allowed ? 1 : 0;
              }
              var defaultreturntype = this.options.repositories[this.active_repo.id].defaultreturntype;
              if (defaultreturntype) {
                  if (filelink[defaultreturntype]) {
                      firstfilelink = defaultreturntype;
                  }
              }
              // make radio buttons enabled if this file-link-type is available and only if there are more than one file-link-type option
              // check the first available file-link-type option
              for (var linktype in filelink) {
                  var el = selectnode.one('.fp-linktype-'+linktype);
                  el.addClassIf('uneditable', !(filelink[linktype] && filelinkcount>1));
                  el.one('input').set('checked', (firstfilelink == linktype) ? 'checked' : '').simulate('change');
              }
  
              // TODO MDL-32532: attributes 'hasauthor' and 'haslicense' need to be obsolete,
              selectnode.one('.fp-setauthor input').set('value', args.author ? args.author : this.options.author);
              this.populateLicensesSelect(selectnode.one('.fp-setlicense select'), args);
              selectnode.one('form #filesource-'+client_id).set('value', args.source);
              selectnode.one('form #filesourcekey-'+client_id).set('value', args.sourcekey);
  
              // display static information about a file (when known)
              var attrs = ['datemodified','datecreated','size','license','author','dimensions'];
              for (var i in attrs) {
                  if (selectnode.one('.fp-'+attrs[i])) {
                      var value = (args[attrs[i]+'_f']) ? args[attrs[i]+'_f'] : (args[attrs[i]] ? args[attrs[i]] : '');
                      selectnode.one('.fp-'+attrs[i]).addClassIf('fp-unknown', ''+value == '')
                          .one('.fp-value').setContent(Y.Escape.html(value));
                  }
              }
          },
          setup_select_file: function() {
              var client_id = this.options.client_id;
              var selectnode = this.selectnode;
              var getfile = selectnode.one('.fp-select-confirm');
              // bind labels with corresponding inputs
              selectnode.all('.fp-saveas,.fp-linktype-2,.fp-linktype-1,.fp-linktype-4,fp-linktype-8,.fp-setauthor,.fp-setlicense').each(function (node) {
                  node.all('label').set('for', node.one('input,select').generateID());
              });
              selectnode.one('.fp-linktype-2 input').setAttrs({value: 2, name: 'linktype'});
              selectnode.one('.fp-linktype-1 input').setAttrs({value: 1, name: 'linktype'});
              selectnode.one('.fp-linktype-4 input').setAttrs({value: 4, name: 'linktype'});
              selectnode.one('.fp-linktype-8 input').setAttrs({value: 8, name: 'linktype'});
              var changelinktype = function(e) {
                  if (e.currentTarget.get('checked')) {
                      var allowinputs = e.currentTarget.get('value') != 1/*FILE_EXTERNAL*/;
                      selectnode.all('.fp-setauthor,.fp-setlicense,.fp-saveas').each(function(node){
                          node.addClassIf('uneditable', !allowinputs);
                          node.all('input,select').set('disabled', allowinputs?'':'disabled');
                      });
                  }
              };
              selectnode.all('.fp-linktype-2,.fp-linktype-1,.fp-linktype-4,.fp-linktype-8').each(function (node) {
                  node.one('input').on('change', changelinktype, this);
              });
              // register event on clicking submit button
              getfile.on('click', function(e) {
                  e.preventDefault();
                  var client_id = this.options.client_id;
                  var scope = this;
                  var repository_id = this.active_repo.id;
                  var title = selectnode.one('.fp-saveas input').get('value');
                  var filesource = selectnode.one('form #filesource-'+client_id).get('value');
                  var filesourcekey = selectnode.one('form #filesourcekey-'+client_id).get('value');
                  var params = {'title':title, 'source':filesource, 'savepath': this.options.savepath, sourcekey: filesourcekey};
                  var license = selectnode.one('.fp-setlicense select');
                  if (license) {
                      params['license'] = license.get('value');
                      var origlicense = selectnode.one('.fp-license .fp-value');
                      if (origlicense) {
                          origlicense = origlicense.getContent();
                      }
                      if (this.options.rememberuserlicensepref) {
                          this.set_preference('recentlicense', license.get('value'));
                      }
                  }
                  params['author'] = selectnode.one('.fp-setauthor input').get('value');
  
                  var return_types = this.options.repositories[this.active_repo.id].return_types;
                  if (this.options.env == 'editor') {
                      // in editor, images are stored in '/' only
                      params.savepath = '/';
                  }
                  if ((this.options.externallink || this.options.env != 'editor') &&
                              (return_types & 1/*FILE_EXTERNAL*/) &&
                              (this.options.return_types & 1/*FILE_EXTERNAL*/) &&
                              selectnode.one('.fp-linktype-1 input').get('checked')) {
                      params['linkexternal'] = 'yes';
                  } else if ((return_types & 4/*FILE_REFERENCE*/) &&
                          (this.options.return_types & 4/*FILE_REFERENCE*/) &&
                          selectnode.one('.fp-linktype-4 input').get('checked')) {
                      params['usefilereference'] = '1';
                  } else if ((return_types & 8/*FILE_CONTROLLED_LINK*/) &&
                          (this.options.return_types & 8/*FILE_CONTROLLED_LINK*/) &&
                          selectnode.one('.fp-linktype-8 input').get('checked')) {
                      params['usecontrolledlink'] = '1';
                  }
  
                  selectnode.addClass('loading');
                  this.request({
                      action:'download',
                      client_id: client_id,
                      repository_id: repository_id,
                      'params': params,
                      onerror: function(id, obj, args) {
                          selectnode.removeClass('loading');
                          scope.selectui.hide();
                      },
                      callback: function(id, obj, args) {
                          selectnode.removeClass('loading');
                          if (obj.event == 'fileexists') {
                              scope.process_existing_file(obj);
                              return;
                          }
                          if (scope.options.editor_target && scope.options.env=='editor') {
                              scope.options.editor_target.value=obj.url;
                              scope.options.editor_target.dispatchEvent(new Event('change'), {'bubbles': true});
                          }
                          scope.hide();
                          obj.client_id = client_id;
                          var formcallback_scope = args.scope.options.magicscope ? args.scope.options.magicscope : args.scope;
                          scope.options.formcallback.apply(formcallback_scope, [obj]);
                      }
                  }, false);
              }, this);
              var elform = selectnode.one('form');
              elform.appendChild(Y.Node.create('<input/>').
                  setAttrs({type:'hidden',id:'filesource-'+client_id}));
              elform.appendChild(Y.Node.create('<input/>').
                  setAttrs({type:'hidden',id:'filesourcekey-'+client_id}));
              elform.on('keydown', function(e) {
                  if (e.keyCode == 13) {
                      getfile.simulate('click');
                      e.preventDefault();
                  }
              }, this);
              var cancel = selectnode.one('.fp-select-cancel');
              cancel.on('click', function(e) {
                  e.preventDefault();
                  this.selectui.hide();
              }, this);
          },
          wait: function() {
              // First check there isn't already an interval in play, and if there is kill it now.
              if (this.waitinterval != null) {
                  clearInterval(this.waitinterval);
              }
              // Prepare the root node we will set content for and the loading template we want to display as a YUI node.
              var root = this.fpnode.one('.fp-content');
              var content = Y.Node.create(M.core_filepicker.templates.loading).addClass('fp-content-hidden').setStyle('opacity', 0);
              var count = 0;
              // Initiate an interval, we will have a count which will increment every 100 milliseconds.
              // Count 0 - the loading icon will have visibility set to hidden (invisible) and have an opacity of 0 (invisible also)
              // Count 5 - the visiblity will be switched to visible but opacity will still be at 0 (inivisible)
              // Counts 6 - 15 opacity will be increased by 0.1 making the loading icon visible over the period of a second
              // Count 16 - The interval will be cancelled.
              var interval = setInterval(function(){
                  if (!content || !root.contains(content) || count >= 15) {
                      clearInterval(interval);
                      return true;
                  }
                  if (count == 5) {
                      content.removeClass('fp-content-hidden');
                  } else if (count > 5) {
                      var opacity = parseFloat(content.getStyle('opacity'));
                      content.setStyle('opacity', opacity + 0.1);
                  }
                  count++;
                  return false;
              }, 100);
              // Store the wait interval so that we can check it in the future.
              this.waitinterval = interval;
              // Set the content to the loading template.
              root.setContent(content);
          },
          viewbar_set_enabled: function(mode) {
              var viewbar = this.fpnode.one('.fp-viewbar')
              if (viewbar) {
                  if (mode) {
                      viewbar.addClass('enabled').removeClass('disabled');
                      this.fpnode.all('.fp-vb-icons,.fp-vb-tree,.fp-vb-details').setAttribute("aria-disabled", "false");
                      this.fpnode.all('.fp-vb-icons,.fp-vb-tree,.fp-vb-details').setAttribute("tabindex", "");
                  } else {
                      viewbar.removeClass('enabled').addClass('disabled');
                      this.fpnode.all('.fp-vb-icons,.fp-vb-tree,.fp-vb-details').setAttribute("aria-disabled", "true");
                      this.fpnode.all('.fp-vb-icons,.fp-vb-tree,.fp-vb-details').setAttribute("tabindex", "-1");
                  }
              }
              this.fpnode.all('.fp-vb-icons,.fp-vb-tree,.fp-vb-details').removeClass('checked');
              var modes = {1:'icons', 2:'tree', 3:'details'};
              this.fpnode.all('.fp-vb-'+modes[this.viewmode]).addClass('checked');
          },
          viewbar_clicked: function(e) {
              e.preventDefault();
              var viewbar = this.fpnode.one('.fp-viewbar')
              if (!viewbar || !viewbar.hasClass('disabled')) {
                  if (e.currentTarget.hasClass('fp-vb-tree')) {
                      this.viewmode = 2;
                  } else if (e.currentTarget.hasClass('fp-vb-details')) {
                      this.viewmode = 3;
                  } else {
                      this.viewmode = 1;
                  }
                  this.viewbar_set_enabled(true)
                  this.view_files();
                  this.set_preference('recentviewmode', this.viewmode);
              }
          },
          render: function() {
              var client_id = this.options.client_id;
              var fpid = "filepicker-"+ client_id;
              var labelid = 'fp-dialog-label_'+ client_id;
              var width = 873;
              var draggable = true;
              this.fpnode = Y.Node.create(M.core_filepicker.templates.generallayout).
                  set('id', 'filepicker-'+client_id).set('aria-labelledby', labelid);
  
              if (this.in_iframe()) {
                  width = Math.floor(window.innerWidth * 0.95);
                  draggable = false;
              }
  
              this.mainui = new M.core.dialogue({
                  extraClasses : ['filepicker'],
                  draggable    : draggable,
                  bodyContent  : this.fpnode,
                  headerContent: '<h3 id="'+ labelid +'">'+ M.util.get_string('filepicker', 'repository') +'</h3>',
                  centered     : true,
                  modal        : true,
                  visible      : false,
                  width        : width+'px',
                  responsiveWidth : 768,
                  height       : '558px',
                  zIndex       : this.options.zIndex,
                  focusOnPreviousTargetAfterHide: true,
                  focusAfterHide: this.options.previousActiveElement
              });
  
              // create panel for selecting a file (initially hidden)
              this.selectnode = Y.Node.create(M.core_filepicker.templates.selectlayout).
                  set('id', 'filepicker-select-'+client_id).
                  set('aria-live', 'assertive').
                  set('role', 'dialog');
  
              var fplabel = 'fp-file_label_'+ client_id;
              this.selectui = new M.core.dialogue({
                  headerContent: '<h3 id="' + fplabel +'">'+M.util.get_string('select', 'repository')+'</h3>',
                  draggable    : true,
                  width        : '450px',
                  bodyContent  : this.selectnode,
                  centered     : true,
                  modal        : true,
                  visible      : false,
                  zIndex       : this.options.zIndex
              });
              Y.one('#'+this.selectnode.get('id')).setAttribute('aria-labelledby', fplabel);
              // event handler for lazy loading of thumbnails and next page
              this.fpnode.one('.fp-content').on(['scroll','resize'], this.content_scrolled, this);
              // save template for one path element and location of path bar
              if (this.fpnode.one('.fp-path-folder')) {
                  this.pathnode = this.fpnode.one('.fp-path-folder');
                  this.pathbar = this.pathnode.get('parentNode');
                  this.pathbar.removeChild(this.pathnode);
              }
              // assign callbacks for view mode switch buttons
              this.fpnode.one('.fp-vb-icons').on('click', this.viewbar_clicked, this);
              this.fpnode.one('.fp-vb-tree').on('click', this.viewbar_clicked, this);
              this.fpnode.one('.fp-vb-details').on('click', this.viewbar_clicked, this);
  
              // assign callbacks for toolbar links
              this.setup_toolbar();
              this.setup_select_file();
              this.hide_header();
  
              // processing repository listing
              // Resort the repositories by sortorder
              var sorted_repositories = [];
              var i;
              for (i in this.options.repositories) {
                  sorted_repositories[i] = this.options.repositories[i];
              }
              sorted_repositories.sort(function(a,b){return a.sortorder-b.sortorder});
              // extract one repository template and repeat it for all repositories available,
              // set name and icon and assign callbacks
              var reponode = this.fpnode.one('.fp-repo');
              if (reponode) {
                  var list = reponode.get('parentNode');
                  list.removeChild(reponode);
                  for (i in sorted_repositories) {
                      var repository = sorted_repositories[i];
                      var h = (parseInt(i) == 0) ? parseInt(i) : parseInt(i) - 1,
                          j = (parseInt(i) == Object.keys(sorted_repositories).length - 1) ? parseInt(i) : parseInt(i) + 1;
                      var previousrepository = sorted_repositories[h];
                      var nextrepository = sorted_repositories[j];
                      var node = reponode.cloneNode(true);
                      list.appendChild(node);
                      node.
                          set('id', 'fp-repo-'+client_id+'-'+repository.id).
                          on('click', function(e, repository_id) {
                              e.preventDefault();
                              this.set_preference('recentrepository', repository_id);
                              this.hide_header();
                              this.list({'repo_id':repository_id});
                          }, this /*handler running scope*/, repository.id/*second argument of handler*/);
                      node.on('key', function(e, previousrepositoryid, nextrepositoryid, clientid, repositoryid) {
                          this.changeHighlightedRepository(e, clientid, repositoryid, previousrepositoryid, nextrepositoryid);
                      }, 'down:38,40', this, previousrepository.id, nextrepository.id, client_id, repository.id);
                      node.on('key', function(e, repositoryid) {
                          e.preventDefault();
                          this.set_preference('recentrepository', repositoryid);
                          this.hide_header();
                          this.list({'repo_id': repositoryid});
                      }, 'enter', this, repository.id);
                      node.one('.fp-repo-name').setContent(Y.Escape.html(repository.name));
                      node.one('.fp-repo-icon').set('src', repository.icon);
                      if (i==0) {
                          node.addClass('first');
                      }
                      if (i==sorted_repositories.length-1) {
                          node.addClass('last');
                      }
                      if (i%2) {
                          node.addClass('even');
                      } else {
                          node.addClass('odd');
                      }
                  }
              }
              // display error if no repositories found
              if (sorted_repositories.length==0) {
                  this.display_error(M.util.get_string('norepositoriesavailable', 'repository'), 'norepositoriesavailable')
              }
              // display repository that was used last time
              this.mainui.show();
              this.show_recent_repository();
          },
          /**
           * Change the highlighted repository to a new one.
           *
           * @param  {object} event The key event
           * @param  {integer} clientid The client id to identify the repo class.
           * @param  {integer} oldrepositoryid The repository id that we are removing the highlight for
           * @param  {integer} previousrepositoryid The previous repository id.
           * @param  {integer} nextrepositoryid The next repository id.
           */
          changeHighlightedRepository: function(event, clientid, oldrepositoryid, previousrepositoryid, nextrepositoryid) {
              event.preventDefault();
              var newrepositoryid = (event.keyCode == '40') ? nextrepositoryid : previousrepositoryid;
              this.fpnode.one('#fp-repo-' + clientid + '-' + oldrepositoryid).setAttribute('tabindex', '-1');
              this.fpnode.one('#fp-repo-' + clientid + '-' + newrepositoryid)
                      .setAttribute('tabindex', '0')
                      .focus();
          },
          parse_repository_options: function(data, appendtolist) {
              if (appendtolist) {
                  if (data.list) {
                      if (!this.filelist) {
                          this.filelist = [];
                      }
                      for (var i in data.list) {
                          this.filelist[this.filelist.length] = data.list[i];
                      }
                  }
              } else {
                  this.filelist = data.list?data.list:null;
                  this.lazyloading = {};
              }
              this.filepath = data.path?data.path:null;
              this.objecttag = data.object?data.object:null;
              this.active_repo = {};
              this.active_repo.issearchresult = data.issearchresult ? true : false;
              this.active_repo.defaultreturntype = data.defaultreturntype?data.defaultreturntype:null;
              this.active_repo.dynload = data.dynload?data.dynload:false;
              this.active_repo.pages = Number(data.pages?data.pages:null);
              this.active_repo.page = Number(data.page?data.page:null);
              this.active_repo.hasmorepages = (this.active_repo.pages && this.active_repo.page && (this.active_repo.page < this.active_repo.pages || this.active_repo.pages == -1))
              this.active_repo.id = data.repo_id?data.repo_id:null;
              this.active_repo.nosearch = (data.login || data.nosearch); // this is either login form or 'nosearch' attribute set
              this.active_repo.norefresh = (data.login || data.norefresh); // this is either login form or 'norefresh' attribute set
              this.active_repo.nologin = (data.login || data.nologin); // this is either login form or 'nologin' attribute is set
              this.active_repo.logouttext = data.logouttext?data.logouttext:null;
              this.active_repo.logouturl = (data.logouturl || '');
              this.active_repo.message = (data.message || '');
              this.active_repo.help = data.help?data.help:null;
              this.active_repo.manage = data.manage?data.manage:null;
              this.print_header();
          },
          print_login: function(data) {
              this.parse_repository_options(data);
              var client_id = this.options.client_id;
              var repository_id = data.repo_id;
              var l = this.logindata = data.login;
              var loginurl = '';
              var action = data['login_btn_action'] ? data['login_btn_action'] : 'login';
              var form_id = 'fp-form-'+client_id;
  
              var loginform_node = Y.Node.create(M.core_filepicker.templates.loginform);
              loginform_node.one('form').set('id', form_id);
              this.fpnode.one('.fp-content').setContent('').appendChild(loginform_node);
              var templates = {
                  'popup' : loginform_node.one('.fp-login-popup'),
                  'textarea' : loginform_node.one('.fp-login-textarea'),
                  'select' : loginform_node.one('.fp-login-select'),
                  'text' : loginform_node.one('.fp-login-text'),
                  'radio' : loginform_node.one('.fp-login-radiogroup'),
                  'checkbox' : loginform_node.one('.fp-login-checkbox'),
                  'input' : loginform_node.one('.fp-login-input')
              };
              var container;
              for (var i in templates) {
                  if (templates[i]) {
                      container = templates[i].get('parentNode');
                      container.removeChild(templates[i]);
                  }
              }
  
              for(var k in l) {
                  if (templates[l[k].type]) {
                      var node = templates[l[k].type].cloneNode(true);
                  } else {
                      node = templates['input'].cloneNode(true);
                  }
                  if (l[k].type == 'popup') {
                      // submit button
                      loginurl = l[k].url;
                      var popupbutton = node.one('button');
                      popupbutton.on('click', function(e){
                          M.core_filepicker.active_filepicker = this;
                          window.open(loginurl, 'repo_auth', 'location=0,status=0,width=500,height=300,scrollbars=yes');
                          e.preventDefault();
                      }, this);
                      loginform_node.one('form').on('keydown', function(e) {
                          if (e.keyCode == 13) {
                              popupbutton.simulate('click');
                              e.preventDefault();
                          }
                      }, this);
                      loginform_node.all('.fp-login-submit').remove();
                      action = 'popup';
                  } else if(l[k].type=='textarea') {
                      // textarea element
                      if (node.one('label')) {
                          node.one('label').set('for', l[k].id).setContent(l[k].label);
                      }
                      node.one('textarea').setAttrs({id:l[k].id, name:l[k].name});
                  } else if(l[k].type=='select') {
                      // select element
                      if (node.one('label')) {
                          node.one('label').set('for', l[k].id).setContent(l[k].label);
                      }
                      node.one('select').setAttrs({id:l[k].id, name:l[k].name}).setContent('');
                      for (i in l[k].options) {
                          node.one('select').appendChild(
                              Y.Node.create('<option/>').
                                  set('value', l[k].options[i].value).
                                  setContent(l[k].options[i].label));
                      }
                  } else if(l[k].type=='radio') {
                      // radio input element
                      node.all('label').setContent(l[k].label);
                      var list = l[k].value.split('|');
                      var labels = l[k].value_label.split('|');
                      var radionode = null;
                      for(var item in list) {
                          if (radionode == null) {
                              radionode = node.one('.fp-login-radio');
                              radionode.one('input').set('checked', 'checked');
                          } else {
                              var x = radionode.cloneNode(true);
                              radionode.insert(x, 'after');
                              radionode = x;
                              radionode.one('input').set('checked', '');
                          }
                          radionode.one('input').setAttrs({id:''+l[k].id+item, name:l[k].name,
                              type:l[k].type, value:list[item]});
                          radionode.all('label').setContent(labels[item]).set('for', ''+l[k].id+item)
                      }
                      if (radionode == null) {
                          node.one('.fp-login-radio').remove();
                      }
                  } else {
                      // input element
                      if (node.one('label')) { node.one('label').set('for', l[k].id).setContent(l[k].label) }
                      node.one('input').
                          set('type', l[k].type).
                          set('id', l[k].id).
                          set('name', l[k].name).
                          set('value', l[k].value?l[k].value:'')
                  }
                  container.appendChild(node);
              }
              // custom label text for submit button
              if (data['login_btn_label']) {
                  loginform_node.all('.fp-login-submit').setContent(data['login_btn_label'])
              }
              // register button action for login and search
              if (action == 'login' || action == 'search') {
                  loginform_node.one('.fp-login-submit').on('click', function(e){
                      e.preventDefault();
                      this.hide_header();
                      this.request({
                          'scope': this,
                          'action':(action == 'search') ? 'search' : 'signin',
                          'path': '',
                          'client_id': client_id,
                          'repository_id': repository_id,
                          'form': {id:form_id, upload:false, useDisabled:true},
                          'callback': this.display_response
                      }, true);
                  }, this);
              }
              // if 'Enter' is pressed in the form, simulate the button click
              if (loginform_node.one('.fp-login-submit')) {
                  loginform_node.one('form').on('keydown', function(e) {
                      if (e.keyCode == 13) {
                          loginform_node.one('.fp-login-submit').simulate('click')
                          e.preventDefault();
                      }
                  }, this);
              }
          },
          display_response: function(id, obj, args) {
              var scope = args.scope;
              // highlight the current repository in repositories list
              scope.fpnode.all('.fp-repo.active')
                      .removeClass('active')
                      .setAttribute('aria-selected', 'false')
                      .setAttribute('tabindex', '-1');
              scope.fpnode.all('.nav-link')
                      .removeClass('active')
                      .setAttribute('aria-selected', 'false')
                      .setAttribute('tabindex', '-1');
              var activenode = scope.fpnode.one('#fp-repo-' + scope.options.client_id + '-' + obj.repo_id);
              activenode.addClass('active')
                      .setAttribute('aria-selected', 'true')
                      .setAttribute('tabindex', '0');
              activenode.all('.nav-link').addClass('active');
              // add class repository_REPTYPE to the filepicker (for repository-specific styles)
              for (var i in scope.options.repositories) {
                  scope.fpnode.removeClass('repository_'+scope.options.repositories[i].type)
              }
              if (obj.repo_id && scope.options.repositories[obj.repo_id]) {
                  scope.fpnode.addClass('repository_'+scope.options.repositories[obj.repo_id].type)
              }
              Y.one('.file-picker .fp-repo-items').focus();
  
              // display response
              if (obj.login) {
                  scope.viewbar_set_enabled(false);
                  scope.print_login(obj);
              } else if (obj.upload) {
                  scope.viewbar_set_enabled(false);
                  scope.parse_repository_options(obj);
                  scope.create_upload_form(obj);
              } else if (obj.object) {
                  M.core_filepicker.active_filepicker = scope;
                  scope.viewbar_set_enabled(false);
                  scope.parse_repository_options(obj);
                  scope.create_object_container(obj.object);
              } else if (obj.list) {
                  scope.viewbar_set_enabled(true);
                  scope.parse_repository_options(obj);
                  scope.view_files();
              }
          },
          list: function(args) {
              if (!args) {
                  args = {};
              }
              if (!args.repo_id) {
                  args.repo_id = this.active_repo.id;
              }
              if (!args.path) {
                  args.path = '';
              }
              this.currentpath = args.path;
              this.request({
                  action: 'list',
                  client_id: this.options.client_id,
                  repository_id: args.repo_id,
                  path: args.path,
                  page: args.page,
                  scope: this,
                  callback: this.display_response
              }, true);
          },
          populateLicensesSelect: function(licensenode, filenode) {
              if (!licensenode) {
                  return;
              }
              licensenode.setContent('');
              var selectedlicense = this.options.defaultlicense;
              if (filenode) {
                  // File has a license already, use it.
                  selectedlicense = filenode.license;
              } else if (this.options.rememberuserlicensepref) {
                  selectedlicense = this.get_preference('recentlicense');
              }
              var licenses = this.options.licenses;
              for (var i in licenses) {
                  // Include the file's current license, even if not enabled, to prevent displaying
                  // misleading information about which license the file currently has assigned to it.
                  if (licenses[i].enabled == true || (filenode !== undefined && licenses[i].shortname === filenode.license)) {
                      var option = Y.Node.create('<option/>').
                      set('selected', (licenses[i].shortname == selectedlicense)).
                      set('value', licenses[i].shortname).
                      setContent(Y.Escape.html(licenses[i].fullname));
                      licensenode.appendChild(option);
                  }
              }
          },
          create_object_container: function(data) {
              var content = this.fpnode.one('.fp-content');
              content.setContent('');
              //var str = '<object data="'+data.src+'" type="'+data.type+'" width="98%" height="98%" id="container_object" class="fp-object-container mdl-align"></object>';
              var container = Y.Node.create('<object/>').
                  setAttrs({data:data.src, type:data.type, id:'container_object'}).
                  addClass('fp-object-container');
              content.setContent('').appendChild(container);
          },
          create_upload_form: function(data) {
              var client_id = this.options.client_id;
              var id = data.upload.id+'_'+client_id;
              var content = this.fpnode.one('.fp-content');
              var template_name = 'uploadform_'+this.options.repositories[data.repo_id].type;
              var template = M.core_filepicker.templates[template_name] || M.core_filepicker.templates['uploadform'];
              content.setContent(template);
  
              content.all('.fp-file,.fp-saveas,.fp-setauthor,.fp-setlicense').each(function (node) {
                  node.all('label').set('for', node.one('input,select').generateID());
              });
              content.one('form').set('id', id);
              content.one('.fp-file input').set('name', 'repo_upload_file');
              if (data.upload.label && content.one('.fp-file label')) {
                  content.one('.fp-file label').setContent(data.upload.label);
              }
              content.one('.fp-saveas input').set('name', 'title');
              content.one('.fp-setauthor input').setAttrs({name:'author', value:this.options.author});
              content.one('.fp-setlicense select').set('name', 'license');
              this.populateLicensesSelect(content.one('.fp-setlicense select'));
              // append hidden inputs to the upload form
              content.one('form').appendChild(Y.Node.create('<input/>').
                  setAttrs({type:'hidden',name:'itemid',value:this.options.itemid}));
              var types = this.options.accepted_types;
              for (var i in types) {
                  content.one('form').appendChild(Y.Node.create('<input/>').
                      setAttrs({type:'hidden',name:'accepted_types[]',value:types[i]}));
              }
  
              var scope = this;
              content.one('.fp-upload-btn').on('click', function(e) {
                  e.preventDefault();
                  var license = content.one('.fp-setlicense select');
  
                  if (this.options.rememberuserlicensepref) {
                      this.set_preference('recentlicense', license.get('value'));
                  }
                  if (!content.one('.fp-file input').get('value')) {
                      scope.print_msg(M.util.get_string('nofilesattached', 'repository'), 'error');
                      return false;
                  }
                  this.hide_header();
                  scope.request({
                          scope: scope,
                          action:'upload',
                          client_id: client_id,
                          params: {'savepath':scope.options.savepath},
                          repository_id: scope.active_repo.id,
                          form: {id: id, upload:true},
                          onerror: function(id, o, args) {
                              scope.create_upload_form(data);
                          },
                          callback: function(id, o, args) {
                              if (o.event == 'fileexists') {
                                  scope.create_upload_form(data);
                                  scope.process_existing_file(o);
                                  return;
                              }
                              if (scope.options.editor_target&&scope.options.env=='editor') {
                                  scope.options.editor_target.value=o.url;
                                  scope.options.editor_target.dispatchEvent(new Event('change'), {'bubbles': true});
                              }
                              scope.hide();
                              o.client_id = client_id;
                              var formcallback_scope = args.scope.options.magicscope ? args.scope.options.magicscope : args.scope;
                              scope.options.formcallback.apply(formcallback_scope, [o]);
                          }
                  }, true);
              }, this);
          },
          /** setting handlers and labels for elements in toolbar. Called once during the initial render of filepicker */
          setup_toolbar: function() {
              var client_id = this.options.client_id;
              var toolbar = this.fpnode.one('.fp-toolbar');
              toolbar.one('.fp-tb-logout').one('a,button').on('click', function(e) {
                  e.preventDefault();
                  if (!this.active_repo.nologin) {
                      this.hide_header();
                      this.request({
                          action:'logout',
                          client_id: this.options.client_id,
                          repository_id: this.active_repo.id,
                          path:'',
                          callback: this.display_response
                      }, true);
                  }
                  if (this.active_repo.logouturl) {
                      window.open(this.active_repo.logouturl, 'repo_auth', 'location=0,status=0,width=500,height=300,scrollbars=yes');
                  }
              }, this);
              toolbar.one('.fp-tb-refresh').one('a,button').on('click', function(e) {
                  e.preventDefault();
                  if (!this.active_repo.norefresh) {
                      this.list({ path: this.currentpath });
                  }
              }, this);
              toolbar.one('.fp-tb-search form').
                  set('method', 'POST').
                  set('id', 'fp-tb-search-'+client_id).
                  on('submit', function(e) {
                      e.preventDefault();
                      if (!this.active_repo.nosearch) {
                          this.request({
                              scope: this,
                              action:'search',
                              client_id: this.options.client_id,
                              repository_id: this.active_repo.id,
                              form: {id: 'fp-tb-search-'+client_id, upload:false, useDisabled:true},
                              callback: this.display_response
                          }, true);
                      }
              }, this);
  
              // it does not matter what kind of element is .fp-tb-manage, we create a dummy <a>
              // element and use it to open url on click event
              var managelnk = Y.Node.create('<a/>').
                  setAttrs({id:'fp-tb-manage-'+client_id+'-link', target:'_blank'}).
                  setStyle('display', 'none');
              toolbar.append(managelnk);
              toolbar.one('.fp-tb-manage').one('a,button').
                  on('click', function(e) {
                      e.preventDefault();
                      managelnk.simulate('click')
                  });
  
              // same with .fp-tb-help
              var helplnk = Y.Node.create('<a/>').
                  setAttrs({id:'fp-tb-help-'+client_id+'-link', target:'_blank'}).
                  setStyle('display', 'none');
              toolbar.append(helplnk);
              toolbar.one('.fp-tb-help').one('a,button').
                  on('click', function(e) {
                      e.preventDefault();
                      helplnk.simulate('click')
                  });
          },
          hide_header: function() {
              if (this.fpnode.one('.fp-toolbar')) {
                  this.fpnode.one('.fp-toolbar').addClass('empty');
              }
              if (this.pathbar) {
                  this.pathbar.setContent('').addClass('empty');
              }
          },
          print_header: function() {
              var r = this.active_repo;
              var scope = this;
              var client_id = this.options.client_id;
              this.hide_header();
              this.print_path();
              var toolbar = this.fpnode.one('.fp-toolbar');
              if (!toolbar) { return; }
  
              var enable_tb_control = function(node, enabled) {
                  if (!node) { return; }
                  node.addClassIf('disabled', !enabled).addClassIf('enabled', enabled)
                  if (enabled) {
                      toolbar.removeClass('empty');
                  }
              }
  
              // TODO 'back' permanently disabled for now. Note, flickr_public uses 'Logout' for it!
              enable_tb_control(toolbar.one('.fp-tb-back'), false);
  
              // search form
              enable_tb_control(toolbar.one('.fp-tb-search'), !r.nosearch);
              if(!r.nosearch) {
                  var searchform = toolbar.one('.fp-tb-search form');
                  searchform.setContent('');
                  this.request({
                      scope: this,
                      action:'searchform',
                      repository_id: this.active_repo.id,
                      callback: function(id, obj, args) {
                          if (obj.repo_id == scope.active_repo.id && obj.form) {
                              // if we did not jump to another repository meanwhile
                              searchform.setContent(obj.form);
                              // Highlight search text when user click for search.
                              var searchnode = searchform.one('input[name="s"]');
                              if (searchnode) {
                                  searchnode.once('click', function(e) {
                                      e.preventDefault();
                                      this.select();
                                  });
                              }
                          }
                      }
                  }, false);
              }
  
              // refresh button
              // weather we use cache for this instance, this button will reload listing anyway
              enable_tb_control(toolbar.one('.fp-tb-refresh'), !r.norefresh);
  
              // login button
              enable_tb_control(toolbar.one('.fp-tb-logout'), !r.nologin);
  
              // manage url
              enable_tb_control(toolbar.one('.fp-tb-manage'), r.manage);
              Y.one('#fp-tb-manage-'+client_id+'-link').set('href', r.manage);
  
              // help url
              enable_tb_control(toolbar.one('.fp-tb-help'), r.help);
              Y.one('#fp-tb-help-'+client_id+'-link').set('href', r.help);
  
              // message
              enable_tb_control(toolbar.one('.fp-tb-message'), r.message);
              toolbar.one('.fp-tb-message').setContent(r.message);
          },
          print_path: function() {
              if (!this.pathbar) {
                  return;
              }
              this.pathbar.setContent('').addClass('empty');
              var p = this.filepath;
              if (p && p.length!=0 && this.viewmode != 2) {
                  for(var i = 0; i < p.length; i++) {
                      var el = this.pathnode.cloneNode(true);
                      this.pathbar.appendChild(el);
                      if (i == 0) {
                          el.addClass('first');
                      }
                      if (i == p.length-1) {
                          el.addClass('last');
                      }
                      if (i%2) {
                          el.addClass('even');
                      } else {
                          el.addClass('odd');
                      }
                      el.all('.fp-path-folder-name').setContent(Y.Escape.html(p[i].name));
                      el.on('click',
                              function(e, path) {
                                  e.preventDefault();
                                  this.list({'path':path});
                              },
                          this, p[i].path);
                  }
                  this.pathbar.removeClass('empty');
              }
          },
          hide: function() {
              this.selectui.hide();
              if (this.process_dlg) {
                  this.process_dlg.hide();
              }
              if (this.msg_dlg) {
                  this.msg_dlg.hide();
              }
              this.mainui.hide();
          },
          show: function() {
              if (this.fpnode) {
                  this.hide();
                  this.mainui.show();
                  this.show_recent_repository();
              } else {
                  this.launch();
              }
          },
          launch: function() {
              this.render();
          },
          show_recent_repository: function() {
              this.hide_header();
              this.viewbar_set_enabled(false);
              var repository_id = this.get_preference('recentrepository');
              this.viewmode = this.get_preference('recentviewmode');
              if (this.viewmode != 2 && this.viewmode != 3) {
                  this.viewmode = 1;
              }
              if (this.options.repositories[repository_id]) {
                  this.list({'repo_id':repository_id});
              }
          },
          get_preference: function (name) {
              if (this.options.userprefs[name]) {
                  return this.options.userprefs[name];
              } else {
                  return false;
              }
          },
          set_preference: function(name, value) {
              if (this.options.userprefs[name] != value) {
                  M.util.set_user_preference('filepicker_' + name, value);
                  this.options.userprefs[name] = value;
              }
          },
          in_iframe: function () {
              // If we're not the top window then we're in an iFrame
              return window.self !== window.top;
          }
      });
      var loading = Y.one('#filepicker-loading-'+options.client_id);
      if (loading) {
          loading.setStyle('display', 'none');
      }
      M.core_filepicker.instances[options.client_id] = new FilePickerHelper(options);
  };
  