--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vakata-jstree-3.3.5/src/jstree.checkbox.js	Thu Dec 13 22:46:23 2018 -0500
@@ -0,0 +1,976 @@
+/**
+ * ### Checkbox plugin
+ *
+ * This plugin renders checkbox icons in front of each node, making multiple selection much easier.
+ * It also supports tri-state behavior, meaning that if a node has a few of its children checked it will be rendered as undetermined, and state will be propagated up.
+ */
+/*globals jQuery, define, exports, require, document */
+(function (factory) {
+	"use strict";
+	if (typeof define === 'function' && define.amd) {
+		define('jstree.checkbox', ['jquery','jstree'], factory);
+	}
+	else if(typeof exports === 'object') {
+		factory(require('jquery'), require('jstree'));
+	}
+	else {
+		factory(jQuery, jQuery.jstree);
+	}
+}(function ($, jstree, undefined) {
+	"use strict";
+
+	if($.jstree.plugins.checkbox) { return; }
+
+	var _i = document.createElement('I');
+	_i.className = 'jstree-icon jstree-checkbox';
+	_i.setAttribute('role', 'presentation');
+	/**
+	 * stores all defaults for the checkbox plugin
+	 * @name $.jstree.defaults.checkbox
+	 * @plugin checkbox
+	 */
+	$.jstree.defaults.checkbox = {
+		/**
+		 * a boolean indicating if checkboxes should be visible (can be changed at a later time using `show_checkboxes()` and `hide_checkboxes`). Defaults to `true`.
+		 * @name $.jstree.defaults.checkbox.visible
+		 * @plugin checkbox
+		 */
+		visible				: true,
+		/**
+		 * a boolean indicating if checkboxes should cascade down and have an undetermined state. Defaults to `true`.
+		 * @name $.jstree.defaults.checkbox.three_state
+		 * @plugin checkbox
+		 */
+		three_state			: true,
+		/**
+		 * a boolean indicating if clicking anywhere on the node should act as clicking on the checkbox. Defaults to `true`.
+		 * @name $.jstree.defaults.checkbox.whole_node
+		 * @plugin checkbox
+		 */
+		whole_node			: true,
+		/**
+		 * a boolean indicating if the selected style of a node should be kept, or removed. Defaults to `true`.
+		 * @name $.jstree.defaults.checkbox.keep_selected_style
+		 * @plugin checkbox
+		 */
+		keep_selected_style	: true,
+		/**
+		 * This setting controls how cascading and undetermined nodes are applied.
+		 * If 'up' is in the string - cascading up is enabled, if 'down' is in the string - cascading down is enabled, if 'undetermined' is in the string - undetermined nodes will be used.
+		 * If `three_state` is set to `true` this setting is automatically set to 'up+down+undetermined'. Defaults to ''.
+		 * @name $.jstree.defaults.checkbox.cascade
+		 * @plugin checkbox
+		 */
+		cascade				: '',
+		/**
+		 * This setting controls if checkbox are bound to the general tree selection or to an internal array maintained by the checkbox plugin. Defaults to `true`, only set to `false` if you know exactly what you are doing.
+		 * @name $.jstree.defaults.checkbox.tie_selection
+		 * @plugin checkbox
+		 */
+		tie_selection		: true,
+
+		/**
+		 * This setting controls if cascading down affects disabled checkboxes
+		 * @name $.jstree.defaults.checkbox.cascade_to_disabled
+		 * @plugin checkbox
+		 */
+		cascade_to_disabled : true,
+
+		/**
+		 * This setting controls if cascading down affects hidden checkboxes
+		 * @name $.jstree.defaults.checkbox.cascade_to_hidden
+		 * @plugin checkbox
+		 */
+		cascade_to_hidden : true
+	};
+	$.jstree.plugins.checkbox = function (options, parent) {
+		this.bind = function () {
+			parent.bind.call(this);
+			this._data.checkbox.uto = false;
+			this._data.checkbox.selected = [];
+			if(this.settings.checkbox.three_state) {
+				this.settings.checkbox.cascade = 'up+down+undetermined';
+			}
+			this.element
+				.on("init.jstree", $.proxy(function () {
+						this._data.checkbox.visible = this.settings.checkbox.visible;
+						if(!this.settings.checkbox.keep_selected_style) {
+							this.element.addClass('jstree-checkbox-no-clicked');
+						}
+						if(this.settings.checkbox.tie_selection) {
+							this.element.addClass('jstree-checkbox-selection');
+						}
+					}, this))
+				.on("loading.jstree", $.proxy(function () {
+						this[ this._data.checkbox.visible ? 'show_checkboxes' : 'hide_checkboxes' ]();
+					}, this));
+			if(this.settings.checkbox.cascade.indexOf('undetermined') !== -1) {
+				this.element
+					.on('changed.jstree uncheck_node.jstree check_node.jstree uncheck_all.jstree check_all.jstree move_node.jstree copy_node.jstree redraw.jstree open_node.jstree', $.proxy(function () {
+							// only if undetermined is in setting
+							if(this._data.checkbox.uto) { clearTimeout(this._data.checkbox.uto); }
+							this._data.checkbox.uto = setTimeout($.proxy(this._undetermined, this), 50);
+						}, this));
+			}
+			if(!this.settings.checkbox.tie_selection) {
+				this.element
+					.on('model.jstree', $.proxy(function (e, data) {
+						var m = this._model.data,
+							p = m[data.parent],
+							dpc = data.nodes,
+							i, j;
+						for(i = 0, j = dpc.length; i < j; i++) {
+							m[dpc[i]].state.checked = m[dpc[i]].state.checked || (m[dpc[i]].original && m[dpc[i]].original.state && m[dpc[i]].original.state.checked);
+							if(m[dpc[i]].state.checked) {
+								this._data.checkbox.selected.push(dpc[i]);
+							}
+						}
+					}, this));
+			}
+			if(this.settings.checkbox.cascade.indexOf('up') !== -1 || this.settings.checkbox.cascade.indexOf('down') !== -1) {
+				this.element
+					.on('model.jstree', $.proxy(function (e, data) {
+							var m = this._model.data,
+								p = m[data.parent],
+								dpc = data.nodes,
+								chd = [],
+								c, i, j, k, l, tmp, s = this.settings.checkbox.cascade, t = this.settings.checkbox.tie_selection;
+
+							if(s.indexOf('down') !== -1) {
+								// apply down
+								if(p.state[ t ? 'selected' : 'checked' ]) {
+									for(i = 0, j = dpc.length; i < j; i++) {
+										m[dpc[i]].state[ t ? 'selected' : 'checked' ] = true;
+									}
+
+									this._data[ t ? 'core' : 'checkbox' ].selected = this._data[ t ? 'core' : 'checkbox' ].selected.concat(dpc);
+								}
+								else {
+									for(i = 0, j = dpc.length; i < j; i++) {
+										if(m[dpc[i]].state[ t ? 'selected' : 'checked' ]) {
+											for(k = 0, l = m[dpc[i]].children_d.length; k < l; k++) {
+												m[m[dpc[i]].children_d[k]].state[ t ? 'selected' : 'checked' ] = true;
+											}
+											this._data[ t ? 'core' : 'checkbox' ].selected = this._data[ t ? 'core' : 'checkbox' ].selected.concat(m[dpc[i]].children_d);
+										}
+									}
+								}
+							}
+
+							if(s.indexOf('up') !== -1) {
+								// apply up
+								for(i = 0, j = p.children_d.length; i < j; i++) {
+									if(!m[p.children_d[i]].children.length) {
+										chd.push(m[p.children_d[i]].parent);
+									}
+								}
+								chd = $.vakata.array_unique(chd);
+								for(k = 0, l = chd.length; k < l; k++) {
+									p = m[chd[k]];
+									while(p && p.id !== $.jstree.root) {
+										c = 0;
+										for(i = 0, j = p.children.length; i < j; i++) {
+											c += m[p.children[i]].state[ t ? 'selected' : 'checked' ];
+										}
+										if(c === j) {
+											p.state[ t ? 'selected' : 'checked' ] = true;
+											this._data[ t ? 'core' : 'checkbox' ].selected.push(p.id);
+											tmp = this.get_node(p, true);
+											if(tmp && tmp.length) {
+												tmp.attr('aria-selected', true).children('.jstree-anchor').addClass( t ? 'jstree-clicked' : 'jstree-checked');
+											}
+										}
+										else {
+											break;
+										}
+										p = this.get_node(p.parent);
+									}
+								}
+							}
+
+							this._data[ t ? 'core' : 'checkbox' ].selected = $.vakata.array_unique(this._data[ t ? 'core' : 'checkbox' ].selected);
+						}, this))
+					.on(this.settings.checkbox.tie_selection ? 'select_node.jstree' : 'check_node.jstree', $.proxy(function (e, data) {
+							var self = this,
+								obj = data.node,
+								m = this._model.data,
+								par = this.get_node(obj.parent),
+								i, j, c, tmp, s = this.settings.checkbox.cascade, t = this.settings.checkbox.tie_selection,
+								sel = {}, cur = this._data[ t ? 'core' : 'checkbox' ].selected;
+
+							for (i = 0, j = cur.length; i < j; i++) {
+								sel[cur[i]] = true;
+							}
+
+							// apply down
+							if(s.indexOf('down') !== -1) {
+								//this._data[ t ? 'core' : 'checkbox' ].selected = $.vakata.array_unique(this._data[ t ? 'core' : 'checkbox' ].selected.concat(obj.children_d));
+								var selectedIds = this._cascade_new_checked_state(obj.id, true);
+								var temp = obj.children_d.concat(obj.id);
+								for (i = 0, j = temp.length; i < j; i++) {
+									if (selectedIds.indexOf(temp[i]) > -1) {
+										sel[temp[i]] = true;
+									}
+									else {
+										delete sel[temp[i]];
+									}
+								}
+							}
+
+							// apply up
+							if(s.indexOf('up') !== -1) {
+								while(par && par.id !== $.jstree.root) {
+									c = 0;
+									for(i = 0, j = par.children.length; i < j; i++) {
+										c += m[par.children[i]].state[ t ? 'selected' : 'checked' ];
+									}
+									if(c === j) {
+										par.state[ t ? 'selected' : 'checked' ] = true;
+										sel[par.id] = true;
+										//this._data[ t ? 'core' : 'checkbox' ].selected.push(par.id);
+										tmp = this.get_node(par, true);
+										if(tmp && tmp.length) {
+											tmp.attr('aria-selected', true).children('.jstree-anchor').addClass(t ? 'jstree-clicked' : 'jstree-checked');
+										}
+									}
+									else {
+										break;
+									}
+									par = this.get_node(par.parent);
+								}
+							}
+
+							cur = [];
+							for (i in sel) {
+								if (sel.hasOwnProperty(i)) {
+									cur.push(i);
+								}
+							}
+							this._data[ t ? 'core' : 'checkbox' ].selected = cur;
+						}, this))
+					.on(this.settings.checkbox.tie_selection ? 'deselect_all.jstree' : 'uncheck_all.jstree', $.proxy(function (e, data) {
+							var obj = this.get_node($.jstree.root),
+								m = this._model.data,
+								i, j, tmp;
+							for(i = 0, j = obj.children_d.length; i < j; i++) {
+								tmp = m[obj.children_d[i]];
+								if(tmp && tmp.original && tmp.original.state && tmp.original.state.undetermined) {
+									tmp.original.state.undetermined = false;
+								}
+							}
+						}, this))
+					.on(this.settings.checkbox.tie_selection ? 'deselect_node.jstree' : 'uncheck_node.jstree', $.proxy(function (e, data) {
+							var self = this,
+								obj = data.node,
+								dom = this.get_node(obj, true),
+								i, j, tmp, s = this.settings.checkbox.cascade, t = this.settings.checkbox.tie_selection,
+								cur = this._data[ t ? 'core' : 'checkbox' ].selected, sel = {},
+								stillSelectedIds = [],
+								allIds = obj.children_d.concat(obj.id);
+
+							// apply down
+							if(s.indexOf('down') !== -1) {
+								var selectedIds = this._cascade_new_checked_state(obj.id, false);
+
+								cur = cur.filter(function(id) {
+									return allIds.indexOf(id) === -1 || selectedIds.indexOf(id) > -1;
+								});
+							}
+
+							// only apply up if cascade up is enabled and if this node is not selected
+							// (if all child nodes are disabled and cascade_to_disabled === false then this node will till be selected).
+							if(s.indexOf('up') !== -1 && cur.indexOf(obj.id) === -1) {
+								for(i = 0, j = obj.parents.length; i < j; i++) {
+									tmp = this._model.data[obj.parents[i]];
+									tmp.state[ t ? 'selected' : 'checked' ] = false;
+									if(tmp && tmp.original && tmp.original.state && tmp.original.state.undetermined) {
+										tmp.original.state.undetermined = false;
+									}
+									tmp = this.get_node(obj.parents[i], true);
+									if(tmp && tmp.length) {
+										tmp.attr('aria-selected', false).children('.jstree-anchor').removeClass(t ? 'jstree-clicked' : 'jstree-checked');
+									}
+								}
+
+								cur = cur.filter(function(id) {
+									return obj.parents.indexOf(id) === -1;
+								});
+							}
+
+							this._data[ t ? 'core' : 'checkbox' ].selected = cur;
+						}, this));
+			}
+			if(this.settings.checkbox.cascade.indexOf('up') !== -1) {
+				this.element
+					.on('delete_node.jstree', $.proxy(function (e, data) {
+							// apply up (whole handler)
+							var p = this.get_node(data.parent),
+								m = this._model.data,
+								i, j, c, tmp, t = this.settings.checkbox.tie_selection;
+							while(p && p.id !== $.jstree.root && !p.state[ t ? 'selected' : 'checked' ]) {
+								c = 0;
+								for(i = 0, j = p.children.length; i < j; i++) {
+									c += m[p.children[i]].state[ t ? 'selected' : 'checked' ];
+								}
+								if(j > 0 && c === j) {
+									p.state[ t ? 'selected' : 'checked' ] = true;
+									this._data[ t ? 'core' : 'checkbox' ].selected.push(p.id);
+									tmp = this.get_node(p, true);
+									if(tmp && tmp.length) {
+										tmp.attr('aria-selected', true).children('.jstree-anchor').addClass(t ? 'jstree-clicked' : 'jstree-checked');
+									}
+								}
+								else {
+									break;
+								}
+								p = this.get_node(p.parent);
+							}
+						}, this))
+					.on('move_node.jstree', $.proxy(function (e, data) {
+							// apply up (whole handler)
+							var is_multi = data.is_multi,
+								old_par = data.old_parent,
+								new_par = this.get_node(data.parent),
+								m = this._model.data,
+								p, c, i, j, tmp, t = this.settings.checkbox.tie_selection;
+							if(!is_multi) {
+								p = this.get_node(old_par);
+								while(p && p.id !== $.jstree.root && !p.state[ t ? 'selected' : 'checked' ]) {
+									c = 0;
+									for(i = 0, j = p.children.length; i < j; i++) {
+										c += m[p.children[i]].state[ t ? 'selected' : 'checked' ];
+									}
+									if(j > 0 && c === j) {
+										p.state[ t ? 'selected' : 'checked' ] = true;
+										this._data[ t ? 'core' : 'checkbox' ].selected.push(p.id);
+										tmp = this.get_node(p, true);
+										if(tmp && tmp.length) {
+											tmp.attr('aria-selected', true).children('.jstree-anchor').addClass(t ? 'jstree-clicked' : 'jstree-checked');
+										}
+									}
+									else {
+										break;
+									}
+									p = this.get_node(p.parent);
+								}
+							}
+							p = new_par;
+							while(p && p.id !== $.jstree.root) {
+								c = 0;
+								for(i = 0, j = p.children.length; i < j; i++) {
+									c += m[p.children[i]].state[ t ? 'selected' : 'checked' ];
+								}
+								if(c === j) {
+									if(!p.state[ t ? 'selected' : 'checked' ]) {
+										p.state[ t ? 'selected' : 'checked' ] = true;
+										this._data[ t ? 'core' : 'checkbox' ].selected.push(p.id);
+										tmp = this.get_node(p, true);
+										if(tmp && tmp.length) {
+											tmp.attr('aria-selected', true).children('.jstree-anchor').addClass(t ? 'jstree-clicked' : 'jstree-checked');
+										}
+									}
+								}
+								else {
+									if(p.state[ t ? 'selected' : 'checked' ]) {
+										p.state[ t ? 'selected' : 'checked' ] = false;
+										this._data[ t ? 'core' : 'checkbox' ].selected = $.vakata.array_remove_item(this._data[ t ? 'core' : 'checkbox' ].selected, p.id);
+										tmp = this.get_node(p, true);
+										if(tmp && tmp.length) {
+											tmp.attr('aria-selected', false).children('.jstree-anchor').removeClass(t ? 'jstree-clicked' : 'jstree-checked');
+										}
+									}
+									else {
+										break;
+									}
+								}
+								p = this.get_node(p.parent);
+							}
+						}, this));
+			}
+		};
+		/**
+		 * get an array of all nodes whose state is "undetermined"
+		 * @name get_undetermined([full])
+		 * @param  {boolean} full: if set to `true` the returned array will consist of the full node objects, otherwise - only IDs will be returned
+		 * @return {Array}
+		 * @plugin checkbox
+		 */
+		this.get_undetermined = function (full) {
+			if (this.settings.checkbox.cascade.indexOf('undetermined') === -1) {
+				return [];
+			}
+			var i, j, k, l, o = {}, m = this._model.data, t = this.settings.checkbox.tie_selection, s = this._data[ t ? 'core' : 'checkbox' ].selected, p = [], tt = this, r = [];
+			for(i = 0, j = s.length; i < j; i++) {
+				if(m[s[i]] && m[s[i]].parents) {
+					for(k = 0, l = m[s[i]].parents.length; k < l; k++) {
+						if(o[m[s[i]].parents[k]] !== undefined) {
+							break;
+						}
+						if(m[s[i]].parents[k] !== $.jstree.root) {
+							o[m[s[i]].parents[k]] = true;
+							p.push(m[s[i]].parents[k]);
+						}
+					}
+				}
+			}
+			// attempt for server side undetermined state
+			this.element.find('.jstree-closed').not(':has(.jstree-children)')
+				.each(function () {
+					var tmp = tt.get_node(this), tmp2;
+					
+					if(!tmp) { return; }
+					
+					if(!tmp.state.loaded) {
+						if(tmp.original && tmp.original.state && tmp.original.state.undetermined && tmp.original.state.undetermined === true) {
+							if(o[tmp.id] === undefined && tmp.id !== $.jstree.root) {
+								o[tmp.id] = true;
+								p.push(tmp.id);
+							}
+							for(k = 0, l = tmp.parents.length; k < l; k++) {
+								if(o[tmp.parents[k]] === undefined && tmp.parents[k] !== $.jstree.root) {
+									o[tmp.parents[k]] = true;
+									p.push(tmp.parents[k]);
+								}
+							}
+						}
+					}
+					else {
+						for(i = 0, j = tmp.children_d.length; i < j; i++) {
+							tmp2 = m[tmp.children_d[i]];
+							if(!tmp2.state.loaded && tmp2.original && tmp2.original.state && tmp2.original.state.undetermined && tmp2.original.state.undetermined === true) {
+								if(o[tmp2.id] === undefined && tmp2.id !== $.jstree.root) {
+									o[tmp2.id] = true;
+									p.push(tmp2.id);
+								}
+								for(k = 0, l = tmp2.parents.length; k < l; k++) {
+									if(o[tmp2.parents[k]] === undefined && tmp2.parents[k] !== $.jstree.root) {
+										o[tmp2.parents[k]] = true;
+										p.push(tmp2.parents[k]);
+									}
+								}
+							}
+						}
+					}
+				});
+			for (i = 0, j = p.length; i < j; i++) {
+				if(!m[p[i]].state[ t ? 'selected' : 'checked' ]) {
+					r.push(full ? m[p[i]] : p[i]);
+				}
+			}
+			return r;
+		};
+		/**
+		 * set the undetermined state where and if necessary. Used internally.
+		 * @private
+		 * @name _undetermined()
+		 * @plugin checkbox
+		 */
+		this._undetermined = function () {
+			if(this.element === null) { return; }
+			var p = this.get_undetermined(false), i, j, s;
+
+			this.element.find('.jstree-undetermined').removeClass('jstree-undetermined');
+			for (i = 0, j = p.length; i < j; i++) {
+				s = this.get_node(p[i], true);
+				if(s && s.length) {
+					s.children('.jstree-anchor').children('.jstree-checkbox').addClass('jstree-undetermined');
+				}
+			}
+		};
+		this.redraw_node = function(obj, deep, is_callback, force_render) {
+			obj = parent.redraw_node.apply(this, arguments);
+			if(obj) {
+				var i, j, tmp = null, icon = null;
+				for(i = 0, j = obj.childNodes.length; i < j; i++) {
+					if(obj.childNodes[i] && obj.childNodes[i].className && obj.childNodes[i].className.indexOf("jstree-anchor") !== -1) {
+						tmp = obj.childNodes[i];
+						break;
+					}
+				}
+				if(tmp) {
+					if(!this.settings.checkbox.tie_selection && this._model.data[obj.id].state.checked) { tmp.className += ' jstree-checked'; }
+					icon = _i.cloneNode(false);
+					if(this._model.data[obj.id].state.checkbox_disabled) { icon.className += ' jstree-checkbox-disabled'; }
+					tmp.insertBefore(icon, tmp.childNodes[0]);
+				}
+			}
+			if(!is_callback && this.settings.checkbox.cascade.indexOf('undetermined') !== -1) {
+				if(this._data.checkbox.uto) { clearTimeout(this._data.checkbox.uto); }
+				this._data.checkbox.uto = setTimeout($.proxy(this._undetermined, this), 50);
+			}
+			return obj;
+		};
+		/**
+		 * show the node checkbox icons
+		 * @name show_checkboxes()
+		 * @plugin checkbox
+		 */
+		this.show_checkboxes = function () { this._data.core.themes.checkboxes = true; this.get_container_ul().removeClass("jstree-no-checkboxes"); };
+		/**
+		 * hide the node checkbox icons
+		 * @name hide_checkboxes()
+		 * @plugin checkbox
+		 */
+		this.hide_checkboxes = function () { this._data.core.themes.checkboxes = false; this.get_container_ul().addClass("jstree-no-checkboxes"); };
+		/**
+		 * toggle the node icons
+		 * @name toggle_checkboxes()
+		 * @plugin checkbox
+		 */
+		this.toggle_checkboxes = function () { if(this._data.core.themes.checkboxes) { this.hide_checkboxes(); } else { this.show_checkboxes(); } };
+		/**
+		 * checks if a node is in an undetermined state
+		 * @name is_undetermined(obj)
+		 * @param  {mixed} obj
+		 * @return {Boolean}
+		 */
+		this.is_undetermined = function (obj) {
+			obj = this.get_node(obj);
+			var s = this.settings.checkbox.cascade, i, j, t = this.settings.checkbox.tie_selection, d = this._data[ t ? 'core' : 'checkbox' ].selected, m = this._model.data;
+			if(!obj || obj.state[ t ? 'selected' : 'checked' ] === true || s.indexOf('undetermined') === -1 || (s.indexOf('down') === -1 && s.indexOf('up') === -1)) {
+				return false;
+			}
+			if(!obj.state.loaded && obj.original.state.undetermined === true) {
+				return true;
+			}
+			for(i = 0, j = obj.children_d.length; i < j; i++) {
+				if($.inArray(obj.children_d[i], d) !== -1 || (!m[obj.children_d[i]].state.loaded && m[obj.children_d[i]].original.state.undetermined)) {
+					return true;
+				}
+			}
+			return false;
+		};
+		/**
+		 * disable a node's checkbox
+		 * @name disable_checkbox(obj)
+		 * @param {mixed} obj an array can be used too
+		 * @trigger disable_checkbox.jstree
+		 * @plugin checkbox
+		 */
+		this.disable_checkbox = function (obj) {
+			var t1, t2, dom;
+			if($.isArray(obj)) {
+				obj = obj.slice();
+				for(t1 = 0, t2 = obj.length; t1 < t2; t1++) {
+					this.disable_checkbox(obj[t1]);
+				}
+				return true;
+			}
+			obj = this.get_node(obj);
+			if(!obj || obj.id === $.jstree.root) {
+				return false;
+			}
+			dom = this.get_node(obj, true);
+			if(!obj.state.checkbox_disabled) {
+				obj.state.checkbox_disabled = true;
+				if(dom && dom.length) {
+					dom.children('.jstree-anchor').children('.jstree-checkbox').addClass('jstree-checkbox-disabled');
+				}
+				/**
+				 * triggered when an node's checkbox is disabled
+				 * @event
+				 * @name disable_checkbox.jstree
+				 * @param {Object} node
+				 * @plugin checkbox
+				 */
+				this.trigger('disable_checkbox', { 'node' : obj });
+			}
+		};
+		/**
+		 * enable a node's checkbox
+		 * @name disable_checkbox(obj)
+		 * @param {mixed} obj an array can be used too
+		 * @trigger enable_checkbox.jstree
+		 * @plugin checkbox
+		 */
+		this.enable_checkbox = function (obj) {
+			var t1, t2, dom;
+			if($.isArray(obj)) {
+				obj = obj.slice();
+				for(t1 = 0, t2 = obj.length; t1 < t2; t1++) {
+					this.enable_checkbox(obj[t1]);
+				}
+				return true;
+			}
+			obj = this.get_node(obj);
+			if(!obj || obj.id === $.jstree.root) {
+				return false;
+			}
+			dom = this.get_node(obj, true);
+			if(obj.state.checkbox_disabled) {
+				obj.state.checkbox_disabled = false;
+				if(dom && dom.length) {
+					dom.children('.jstree-anchor').children('.jstree-checkbox').removeClass('jstree-checkbox-disabled');
+				}
+				/**
+				 * triggered when an node's checkbox is enabled
+				 * @event
+				 * @name enable_checkbox.jstree
+				 * @param {Object} node
+				 * @plugin checkbox
+				 */
+				this.trigger('enable_checkbox', { 'node' : obj });
+			}
+		};
+
+		this.activate_node = function (obj, e) {
+			if($(e.target).hasClass('jstree-checkbox-disabled')) {
+				return false;
+			}
+			if(this.settings.checkbox.tie_selection && (this.settings.checkbox.whole_node || $(e.target).hasClass('jstree-checkbox'))) {
+				e.ctrlKey = true;
+			}
+			if(this.settings.checkbox.tie_selection || (!this.settings.checkbox.whole_node && !$(e.target).hasClass('jstree-checkbox'))) {
+				return parent.activate_node.call(this, obj, e);
+			}
+			if(this.is_disabled(obj)) {
+				return false;
+			}
+			if(this.is_checked(obj)) {
+				this.uncheck_node(obj, e);
+			}
+			else {
+				this.check_node(obj, e);
+			}
+			this.trigger('activate_node', { 'node' : this.get_node(obj) });
+		};
+
+		/**
+		 * Cascades checked state to a node and all its descendants. This function does NOT affect hidden and disabled nodes (or their descendants).
+		 * However if these unaffected nodes are already selected their ids will be included in the returned array.
+		 * @private
+		 * @param {string} id the node ID
+		 * @param {bool} checkedState should the nodes be checked or not
+		 * @returns {Array} Array of all node id's (in this tree branch) that are checked.
+		 */
+		this._cascade_new_checked_state = function (id, checkedState) {
+			var self = this;
+			var t = this.settings.checkbox.tie_selection;
+			var node = this._model.data[id];
+			var selectedNodeIds = [];
+			var selectedChildrenIds = [], i, j, selectedChildIds;
+
+			if (
+				(this.settings.checkbox.cascade_to_disabled || !node.state.disabled) &&
+				(this.settings.checkbox.cascade_to_hidden || !node.state.hidden)
+			) {
+				//First try and check/uncheck the children
+				if (node.children) {
+					for (i = 0, j = node.children.length; i < j; i++) {
+						var childId = node.children[i];
+						selectedChildIds = self._cascade_new_checked_state(childId, checkedState);
+						selectedNodeIds = selectedNodeIds.concat(selectedChildIds);
+						if (selectedChildIds.indexOf(childId) > -1) {
+							selectedChildrenIds.push(childId);
+						}
+					}
+				}
+
+				var dom = self.get_node(node, true);
+
+				//A node's state is undetermined if some but not all of it's children are checked/selected .
+				var undetermined = selectedChildrenIds.length > 0 && selectedChildrenIds.length < node.children.length;
+
+				if(node.original && node.original.state && node.original.state.undetermined) {
+					node.original.state.undetermined = undetermined;
+				}
+
+				//If a node is undetermined then remove selected class
+				if (undetermined) {
+					node.state[ t ? 'selected' : 'checked' ] = false;
+					dom.attr('aria-selected', false).children('.jstree-anchor').removeClass(t ? 'jstree-clicked' : 'jstree-checked');
+				}
+				//Otherwise, if the checkedState === true (i.e. the node is being checked now) and all of the node's children are checked (if it has any children),
+				//check the node and style it correctly.
+				else if (checkedState && selectedChildrenIds.length === node.children.length) {
+					node.state[ t ? 'selected' : 'checked' ] = checkedState;
+					selectedNodeIds.push(node.id);
+
+					dom.attr('aria-selected', true).children('.jstree-anchor').addClass(t ? 'jstree-clicked' : 'jstree-checked');
+				}
+				else {
+					node.state[ t ? 'selected' : 'checked' ] = false;
+					dom.attr('aria-selected', false).children('.jstree-anchor').removeClass(t ? 'jstree-clicked' : 'jstree-checked');
+				}
+			}
+			else {
+				selectedChildIds = this.get_checked_descendants(id);
+
+				if (node.state[ t ? 'selected' : 'checked' ]) {
+					selectedChildIds.push(node.id);
+				}
+
+				selectedNodeIds = selectedNodeIds.concat(selectedChildIds);
+			}
+
+			return selectedNodeIds;
+		};
+
+		/**
+		 * Gets ids of nodes selected in branch (of tree) specified by id (does not include the node specified by id)
+		 * @name get_checked_descendants(obj)
+		 * @param {string} id the node ID
+		 * @return {Array} array of IDs
+		 * @plugin checkbox
+		 */
+		this.get_checked_descendants = function (id) {
+			var self = this;
+			var t = self.settings.checkbox.tie_selection;
+			var node = self._model.data[id];
+
+			return node.children_d.filter(function(_id) {
+				return self._model.data[_id].state[ t ? 'selected' : 'checked' ];
+			});
+		};
+
+		/**
+		 * check a node (only if tie_selection in checkbox settings is false, otherwise select_node will be called internally)
+		 * @name check_node(obj)
+		 * @param {mixed} obj an array can be used to check multiple nodes
+		 * @trigger check_node.jstree
+		 * @plugin checkbox
+		 */
+		this.check_node = function (obj, e) {
+			if(this.settings.checkbox.tie_selection) { return this.select_node(obj, false, true, e); }
+			var dom, t1, t2, th;
+			if($.isArray(obj)) {
+				obj = obj.slice();
+				for(t1 = 0, t2 = obj.length; t1 < t2; t1++) {
+					this.check_node(obj[t1], e);
+				}
+				return true;
+			}
+			obj = this.get_node(obj);
+			if(!obj || obj.id === $.jstree.root) {
+				return false;
+			}
+			dom = this.get_node(obj, true);
+			if(!obj.state.checked) {
+				obj.state.checked = true;
+				this._data.checkbox.selected.push(obj.id);
+				if(dom && dom.length) {
+					dom.children('.jstree-anchor').addClass('jstree-checked');
+				}
+				/**
+				 * triggered when an node is checked (only if tie_selection in checkbox settings is false)
+				 * @event
+				 * @name check_node.jstree
+				 * @param {Object} node
+				 * @param {Array} selected the current selection
+				 * @param {Object} event the event (if any) that triggered this check_node
+				 * @plugin checkbox
+				 */
+				this.trigger('check_node', { 'node' : obj, 'selected' : this._data.checkbox.selected, 'event' : e });
+			}
+		};
+		/**
+		 * uncheck a node (only if tie_selection in checkbox settings is false, otherwise deselect_node will be called internally)
+		 * @name uncheck_node(obj)
+		 * @param {mixed} obj an array can be used to uncheck multiple nodes
+		 * @trigger uncheck_node.jstree
+		 * @plugin checkbox
+		 */
+		this.uncheck_node = function (obj, e) {
+			if(this.settings.checkbox.tie_selection) { return this.deselect_node(obj, false, e); }
+			var t1, t2, dom;
+			if($.isArray(obj)) {
+				obj = obj.slice();
+				for(t1 = 0, t2 = obj.length; t1 < t2; t1++) {
+					this.uncheck_node(obj[t1], e);
+				}
+				return true;
+			}
+			obj = this.get_node(obj);
+			if(!obj || obj.id === $.jstree.root) {
+				return false;
+			}
+			dom = this.get_node(obj, true);
+			if(obj.state.checked) {
+				obj.state.checked = false;
+				this._data.checkbox.selected = $.vakata.array_remove_item(this._data.checkbox.selected, obj.id);
+				if(dom.length) {
+					dom.children('.jstree-anchor').removeClass('jstree-checked');
+				}
+				/**
+				 * triggered when an node is unchecked (only if tie_selection in checkbox settings is false)
+				 * @event
+				 * @name uncheck_node.jstree
+				 * @param {Object} node
+				 * @param {Array} selected the current selection
+				 * @param {Object} event the event (if any) that triggered this uncheck_node
+				 * @plugin checkbox
+				 */
+				this.trigger('uncheck_node', { 'node' : obj, 'selected' : this._data.checkbox.selected, 'event' : e });
+			}
+		};
+		
+		/**
+		 * checks all nodes in the tree (only if tie_selection in checkbox settings is false, otherwise select_all will be called internally)
+		 * @name check_all()
+		 * @trigger check_all.jstree, changed.jstree
+		 * @plugin checkbox
+		 */
+		this.check_all = function () {
+			if(this.settings.checkbox.tie_selection) { return this.select_all(); }
+			var tmp = this._data.checkbox.selected.concat([]), i, j;
+			this._data.checkbox.selected = this._model.data[$.jstree.root].children_d.concat();
+			for(i = 0, j = this._data.checkbox.selected.length; i < j; i++) {
+				if(this._model.data[this._data.checkbox.selected[i]]) {
+					this._model.data[this._data.checkbox.selected[i]].state.checked = true;
+				}
+			}
+			this.redraw(true);
+			/**
+			 * triggered when all nodes are checked (only if tie_selection in checkbox settings is false)
+			 * @event
+			 * @name check_all.jstree
+			 * @param {Array} selected the current selection
+			 * @plugin checkbox
+			 */
+			this.trigger('check_all', { 'selected' : this._data.checkbox.selected });
+		};
+		/**
+		 * uncheck all checked nodes (only if tie_selection in checkbox settings is false, otherwise deselect_all will be called internally)
+		 * @name uncheck_all()
+		 * @trigger uncheck_all.jstree
+		 * @plugin checkbox
+		 */
+		this.uncheck_all = function () {
+			if(this.settings.checkbox.tie_selection) { return this.deselect_all(); }
+			var tmp = this._data.checkbox.selected.concat([]), i, j;
+			for(i = 0, j = this._data.checkbox.selected.length; i < j; i++) {
+				if(this._model.data[this._data.checkbox.selected[i]]) {
+					this._model.data[this._data.checkbox.selected[i]].state.checked = false;
+				}
+			}
+			this._data.checkbox.selected = [];
+			this.element.find('.jstree-checked').removeClass('jstree-checked');
+			/**
+			 * triggered when all nodes are unchecked (only if tie_selection in checkbox settings is false)
+			 * @event
+			 * @name uncheck_all.jstree
+			 * @param {Object} node the previous selection
+			 * @param {Array} selected the current selection
+			 * @plugin checkbox
+			 */
+			this.trigger('uncheck_all', { 'selected' : this._data.checkbox.selected, 'node' : tmp });
+		};
+		/**
+		 * checks if a node is checked (if tie_selection is on in the settings this function will return the same as is_selected)
+		 * @name is_checked(obj)
+		 * @param  {mixed}  obj
+		 * @return {Boolean}
+		 * @plugin checkbox
+		 */
+		this.is_checked = function (obj) {
+			if(this.settings.checkbox.tie_selection) { return this.is_selected(obj); }
+			obj = this.get_node(obj);
+			if(!obj || obj.id === $.jstree.root) { return false; }
+			return obj.state.checked;
+		};
+		/**
+		 * get an array of all checked nodes (if tie_selection is on in the settings this function will return the same as get_selected)
+		 * @name get_checked([full])
+		 * @param  {mixed}  full if set to `true` the returned array will consist of the full node objects, otherwise - only IDs will be returned
+		 * @return {Array}
+		 * @plugin checkbox
+		 */
+		this.get_checked = function (full) {
+			if(this.settings.checkbox.tie_selection) { return this.get_selected(full); }
+			return full ? $.map(this._data.checkbox.selected, $.proxy(function (i) { return this.get_node(i); }, this)) : this._data.checkbox.selected;
+		};
+		/**
+		 * get an array of all top level checked nodes (ignoring children of checked nodes) (if tie_selection is on in the settings this function will return the same as get_top_selected)
+		 * @name get_top_checked([full])
+		 * @param  {mixed}  full if set to `true` the returned array will consist of the full node objects, otherwise - only IDs will be returned
+		 * @return {Array}
+		 * @plugin checkbox
+		 */
+		this.get_top_checked = function (full) {
+			if(this.settings.checkbox.tie_selection) { return this.get_top_selected(full); }
+			var tmp = this.get_checked(true),
+				obj = {}, i, j, k, l;
+			for(i = 0, j = tmp.length; i < j; i++) {
+				obj[tmp[i].id] = tmp[i];
+			}
+			for(i = 0, j = tmp.length; i < j; i++) {
+				for(k = 0, l = tmp[i].children_d.length; k < l; k++) {
+					if(obj[tmp[i].children_d[k]]) {
+						delete obj[tmp[i].children_d[k]];
+					}
+				}
+			}
+			tmp = [];
+			for(i in obj) {
+				if(obj.hasOwnProperty(i)) {
+					tmp.push(i);
+				}
+			}
+			return full ? $.map(tmp, $.proxy(function (i) { return this.get_node(i); }, this)) : tmp;
+		};
+		/**
+		 * get an array of all bottom level checked nodes (ignoring selected parents) (if tie_selection is on in the settings this function will return the same as get_bottom_selected)
+		 * @name get_bottom_checked([full])
+		 * @param  {mixed}  full if set to `true` the returned array will consist of the full node objects, otherwise - only IDs will be returned
+		 * @return {Array}
+		 * @plugin checkbox
+		 */
+		this.get_bottom_checked = function (full) {
+			if(this.settings.checkbox.tie_selection) { return this.get_bottom_selected(full); }
+			var tmp = this.get_checked(true),
+				obj = [], i, j;
+			for(i = 0, j = tmp.length; i < j; i++) {
+				if(!tmp[i].children.length) {
+					obj.push(tmp[i].id);
+				}
+			}
+			return full ? $.map(obj, $.proxy(function (i) { return this.get_node(i); }, this)) : obj;
+		};
+		this.load_node = function (obj, callback) {
+			var k, l, i, j, c, tmp;
+			if(!$.isArray(obj) && !this.settings.checkbox.tie_selection) {
+				tmp = this.get_node(obj);
+				if(tmp && tmp.state.loaded) {
+					for(k = 0, l = tmp.children_d.length; k < l; k++) {
+						if(this._model.data[tmp.children_d[k]].state.checked) {
+							c = true;
+							this._data.checkbox.selected = $.vakata.array_remove_item(this._data.checkbox.selected, tmp.children_d[k]);
+						}
+					}
+				}
+			}
+			return parent.load_node.apply(this, arguments);
+		};
+		this.get_state = function () {
+			var state = parent.get_state.apply(this, arguments);
+			if(this.settings.checkbox.tie_selection) { return state; }
+			state.checkbox = this._data.checkbox.selected.slice();
+			return state;
+		};
+		this.set_state = function (state, callback) {
+			var res = parent.set_state.apply(this, arguments);
+			if(res && state.checkbox) {
+				if(!this.settings.checkbox.tie_selection) {
+					this.uncheck_all();
+					var _this = this;
+					$.each(state.checkbox, function (i, v) {
+						_this.check_node(v);
+					});
+				}
+				delete state.checkbox;
+				this.set_state(state, callback);
+				return false;
+			}
+			return res;
+		};
+		this.refresh = function (skip_loading, forget_state) {
+			if(!this.settings.checkbox.tie_selection) {
+				this._data.checkbox.selected = [];
+			}
+			return parent.refresh.apply(this, arguments);
+		};
+	};
+
+	// include the checkbox plugin by default
+	// $.jstree.defaults.plugins.push("checkbox");
+}));