docs/source/AsyncTreeNode.html

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   2 <head>\r
   3   <title>The source code</title>\r
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   8     <pre class="prettyprint lang-js"><div id="cls-Ext.tree.AsyncTreeNode"></div>/**\r
   9  * @class Ext.tree.AsyncTreeNode\r
  10  * @extends Ext.tree.TreeNode\r
  11  * @cfg {TreeLoader} loader A TreeLoader to be used by this node (defaults to the loader defined on the tree)\r
  12  * @constructor\r
  13  * @param {Object/String} attributes The attributes/config for the node or just a string with the text for the node \r
  14  */\r
  15  Ext.tree.AsyncTreeNode = function(config){\r
  16     this.loaded = config && config.loaded === true;\r
  17     this.loading = false;\r
  18     Ext.tree.AsyncTreeNode.superclass.constructor.apply(this, arguments);\r
  19     /**\r
  20     * @event beforeload\r
  21     * Fires before this node is loaded, return false to cancel\r
  22     * @param {Node} this This node\r
  23     */\r
  24     this.addEvents('beforeload', 'load');\r
  25     /**\r
  26     * @event load\r
  27     * Fires when this node is loaded\r
  28     * @param {Node} this This node\r
  29     */\r
  30     /**\r
  31      * The loader used by this node (defaults to using the tree's defined loader)\r
  32      * @type TreeLoader\r
  33      * @property loader\r
  34      */\r
  35 };\r
  36 Ext.extend(Ext.tree.AsyncTreeNode, Ext.tree.TreeNode, {\r
  37     expand : function(deep, anim, callback, scope){\r
  38         if(this.loading){ // if an async load is already running, waiting til it's done\r
  39             var timer;\r
  40             var f = function(){\r
  41                 if(!this.loading){ // done loading\r
  42                     clearInterval(timer);\r
  43                     this.expand(deep, anim, callback, scope);\r
  44                 }\r
  45             }.createDelegate(this);\r
  46             timer = setInterval(f, 200);\r
  47             return;\r
  48         }\r
  49         if(!this.loaded){\r
  50             if(this.fireEvent("beforeload", this) === false){\r
  51                 return;\r
  52             }\r
  53             this.loading = true;\r
  54             this.ui.beforeLoad(this);\r
  55             var loader = this.loader || this.attributes.loader || this.getOwnerTree().getLoader();\r
  56             if(loader){\r
  57                 loader.load(this, this.loadComplete.createDelegate(this, [deep, anim, callback, scope]), this);\r
  58                 return;\r
  59             }\r
  60         }\r
  61         Ext.tree.AsyncTreeNode.superclass.expand.call(this, deep, anim, callback, scope);\r
  62     },\r
  63     \r
  64     /**\r
  65      * Returns true if this node is currently loading\r
  66      * @return {Boolean}\r
  67      */\r
  68     isLoading : function(){\r
  69         return this.loading;  \r
  70     },\r
  71     \r
  72     loadComplete : function(deep, anim, callback, scope){\r
  73         this.loading = false;\r
  74         this.loaded = true;\r
  75         this.ui.afterLoad(this);\r
  76         this.fireEvent("load", this);\r
  77         this.expand(deep, anim, callback, scope);\r
  78     },\r
  79     \r
  80     /**\r
  81      * Returns true if this node has been loaded\r
  82      * @return {Boolean}\r
  83      */\r
  84     isLoaded : function(){\r
  85         return this.loaded;\r
  86     },\r
  87     \r
  88     hasChildNodes : function(){\r
  89         if(!this.isLeaf() && !this.loaded){\r
  90             return true;\r
  91         }else{\r
  92             return Ext.tree.AsyncTreeNode.superclass.hasChildNodes.call(this);\r
  93         }\r
  94     },\r
  95 \r
  96     /**\r
  97      * Trigger a reload for this node\r
  98      * @param {Function} callback\r
  99      * @param {Object} scope (optional) The scope in which to execute the callback.\r
 100      */\r
 101     reload : function(callback, scope){\r
 102         this.collapse(false, false);\r
 103         while(this.firstChild){\r
 104             this.removeChild(this.firstChild).destroy();\r
 105         }\r
 106         this.childrenRendered = false;\r
 107         this.loaded = false;\r
 108         if(this.isHiddenRoot()){\r
 109             this.expanded = false;\r
 110         }\r
 111         this.expand(false, false, callback, scope);\r
 112     }\r
 113 });\r
 114 \r
 115 Ext.tree.TreePanel.nodeTypes.async = Ext.tree.AsyncTreeNode;</pre>    \r
 116 </body>\r
 117 </html>