docs/output/Ext.tree.TreeLoader.html

   1 <div class="body-wrap" xmlns:ext="http://www.extjs.com"><div class="top-tools"><a class="inner-link" href="#Ext.tree.TreeLoader-props"><img src="resources/images/default/s.gif" class="item-icon icon-prop">Properties</a>&#13;<a class="inner-link" href="#Ext.tree.TreeLoader-methods"><img src="resources/images/default/s.gif" class="item-icon icon-method">Methods</a>&#13;<a class="inner-link" href="#Ext.tree.TreeLoader-events"><img src="resources/images/default/s.gif" class="item-icon icon-event">Events</a>&#13;<a class="inner-link" href="#Ext.tree.TreeLoader-configs"><img src="resources/images/default/s.gif" class="item-icon icon-config">Config Options</a>&#13;<a class="bookmark" href="../docs/?class=Ext.tree.TreeLoader"><img src="resources/images/default/s.gif" class="item-icon icon-fav">Direct Link</a>&#13;</div><div class="inheritance res-block"><pre class="res-block-inner"><a href="output/Ext.util.Observable.html" ext:member="" ext:cls="Ext.util.Observable">Observable</a>&#13;&nbsp;&nbsp;<img src="resources/elbow-end.gif">TreeLoader</pre></div><h1>Class <a href="source/TreeLoader.html#cls-Ext.tree.TreeLoader">Ext.tree.TreeLoader</a></h1><table cellspacing="0"><tr><td class="label">Package:</td><td class="hd-info">Ext.tree</td></tr><tr><td class="label">Defined In:</td><td class="hd-info">TreeLoader.js</td></tr><tr><td class="label">Class:</td><td class="hd-info"><a href="source/TreeLoader.html#cls-Ext.tree.TreeLoader">TreeLoader</a></td></tr><tr><td class="label">Subclasses:</td><td class="hd-info"><a href="output/Ext.ux.tree.XmlTreeLoader.html" ext:cls="Ext.ux.tree.XmlTreeLoader">XmlTreeLoader</a></td></tr><tr><td class="label">Extends:</td><td class="hd-info"><a href="output/Ext.util.Observable.html" ext:cls="Ext.util.Observable" ext:member="">Observable</a></td></tr><tr><td class="hd-info"></td></tr></table><div class="description">A TreeLoader provides for lazy loading of an <a href="output/Ext.tree.TreeNode.html" ext:cls="Ext.tree.TreeNode">Ext.tree.TreeNode</a>'s child\r
   2 nodes from a specified URL. The response must be a JavaScript Array definition\r
   3 whose elements are node definition objects. e.g.:\r
   4 <pre><code>[{\r
   5         id: 1,\r
   6         text: <em>'A leaf Node'</em>,\r
   7         leaf: true\r
   8     },{\r
   9         id: 2,\r
  10         text: <em>'A folder Node'</em>,\r
  11         children: [{\r
  12             id: 3,\r
  13             text: <em>'A child Node'</em>,\r
  14             leaf: true\r
  15         }]\r
  16    }]</code></pre>\r
  17 <br><br>\r
  18 A server request is sent, and child nodes are loaded only when a node is expanded.\r
  19 The loading node's id is passed to the server under the parameter name "node" to\r
  20 enable the server to produce the correct child nodes.\r
  21 <br><br>\r
  22 To pass extra parameters, an event handler may be attached to the "beforeload"\r
  23 event, and the parameters specified in the TreeLoader's baseParams property:\r
  24 <pre><code>myTreeLoader.on(<em>"beforeload"</em>, <b>function</b>(treeLoader, node) {\r
  25         this.baseParams.category = node.attributes.category;\r
  26     }, this);</code></pre>\r
  27 This would pass an HTTP parameter called "category" to the server containing\r
  28 the value of the Node's "category" attribute.</div><div class="hr"></div><a id="Ext.tree.TreeLoader-configs"></a><h2>Config Options</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Config Options</th><th class="msource-header">Defined By</th></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-baseAttrs"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-baseAttrs">baseAttrs</a></b> : Object<div class="mdesc"><div class="short">An object containing attributes to be added to all nodes&#13;\r
  29 created by this loader. If the attributes sent by the serve...</div><div class="long">An object containing attributes to be added to all nodes\r
  30 created by this loader. If the attributes sent by the server have an attribute in this object,\r
  31 they take priority.</div></div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-baseParams"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-baseParams">baseParams</a></b> : Object<div class="mdesc">An object containing properties which\r
  32 specify HTTP parameters to be passed to each request for child nodes.</div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-clearOnLoad"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-clearOnLoad">clearOnLoad</a></b> : Boolean<div class="mdesc">Default to true. Remove previously existing\r
  33 child nodes before loading.</div></td><td class="msource">TreeLoader</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-dataUrl"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-dataUrl">dataUrl</a></b> : String<div class="mdesc"><div class="short">The URL from which to request a Json string which&#13;\r
  34 specifies an array of node definition objects representing the chi...</div><div class="long">The URL from which to request a Json string which\r
  35 specifies an array of node definition objects representing the child nodes\r
  36 to be loaded.</div></div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-directFn"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-directFn">directFn</a></b> : Function<div class="mdesc">Function to call when executing a request.</div></td><td class="msource">TreeLoader</td></tr><tr class="config-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-listeners"></a><b><a href="source/Observable.html#cfg-Ext.util.Observable-listeners">listeners</a></b> : Object<div class="mdesc"><div class="short">A config object containing one or more event handlers to be added to this\r
  37 object during initialization.  This should ...</div><div class="long"><p>A config object containing one or more event handlers to be added to this
  38 object during initialization.  This should be a valid listeners config object as specified in the
  39 <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> example for attaching multiple handlers at once.</p>
  40 <br><p><b><u>DOM events from ExtJs <a href="output/Ext.Component.html" ext:cls="Ext.Component">Components</a></u></b></p>
  41 <br><p>While <i>some</i> ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this
  42 is usually only done when extra value can be added. For example the <a href="output/Ext.DataView.html" ext:cls="Ext.DataView">DataView</a>'s
  43 <b><code><a href="output/Ext.DataView.html#Ext.DataView-click" ext:member="click" ext:cls="Ext.DataView">click</a></code></b> event passing the node clicked on. To access DOM
  44 events directly from a Component's HTMLElement, listeners must be added to the <i><a href="output/Ext.Component.html#Ext.Component-getEl" ext:member="getEl" ext:cls="Ext.Component">Element</a></i> after the Component
  45 has been rendered. A plugin can simplify this step:<pre><code><i>// Plugin is configured <b>with</b> a listeners config object.</i>
  46 <i>// The Component is appended to the argument list of all handler functions.</i>
  47 Ext.DomObserver = Ext.extend(Object, {
  48     constructor: <b>function</b>(config) {
  49         this.listeners = config.listeners ? config.listeners : config;
  50     },
  51
  52     <i>// Component passes itself into plugin&#39;s init method</i>
  53     init: <b>function</b>(c) {
  54         <b>var</b> p, l = this.listeners;
  55         <b>for</b> (p <b>in</b> l) {
  56             <b>if</b> (Ext.isFunction(l[p])) {
  57                 l[p] = this.createHandler(l[p], c);
  58             } <b>else</b> {
  59                 l[p].fn = this.createHandler(l[p].fn, c);
  60             }
  61         }
  62
  63         <i>// Add the listeners to the Element immediately following the render call</i>
  64         c.render = c.render.<a href="output/Function.html#Function-createSequence" ext:member="createSequence" ext:cls="Function">createSequence</a>(<b>function</b>() {
  65             <b>var</b> e = c.getEl();
  66             <b>if</b> (e) {
  67                 e.on(l);
  68             }
  69         });
  70     },
  71
  72     createHandler: <b>function</b>(fn, c) {
  73         <b>return</b> <b>function</b>(e) {
  74             fn.call(this, e, c);
  75         };
  76     }
  77 });
  78
  79 <b>var</b> combo = <b>new</b> Ext.form.ComboBox({
  80
  81     <i>// Collapse combo when its element is clicked on</i>
  82     plugins: [ <b>new</b> Ext.DomObserver({
  83         click: <b>function</b>(evt, comp) {
  84             comp.collapse();
  85         }
  86     })],
  87     store: myStore,
  88     typeAhead: true,
  89     mode: <em>'local'</em>,
  90     triggerAction: <em>'all'</em>
  91 });</code></pre></p></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#listeners" ext:member="#listeners" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-paramOrder"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-paramOrder">paramOrder</a></b> : Array/String<div class="mdesc"><div class="short">Defaults to undefined. Only used when using directFn.&#13;\r
  92 A list of params to be executed&#13;\r
  93 server side.  Specify the par...</div><div class="long">Defaults to <tt>undefined</tt>. Only used when using directFn.\r
  94 A list of params to be executed\r
  95 server side.  Specify the params in the order in which they must be executed on the server-side\r
  96 as either (1) an Array of String values, or (2) a String of params delimited by either whitespace,\r
  97 comma, or pipe. For example,\r
  98 any of the following would be acceptable:<pre><code>paramOrder: [<em>'param1'</em>,<em>'param2'</em>,<em>'param3'</em>]\r
  99 paramOrder: <em>'param1 param2 param3'</em>\r
 100 paramOrder: <em>'param1,param2,param3'</em>\r
 101 paramOrder: <em>'param1|param2|param'</em></code></pre></div></div></td><td class="msource">TreeLoader</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-paramsAsHash"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-paramsAsHash">paramsAsHash</a></b> : Boolean<div class="mdesc"><div class="short">Only used when using directFn.&#13;\r
 102 Send parameters as a collection of named arguments (defaults to false). Providing a&#13;\r
 103 ...</div><div class="long">Only used when using directFn.\r
 104 Send parameters as a collection of named arguments (defaults to <tt>false</tt>). Providing a\r
 105 <tt><a href="output/Ext.tree.TreeLoader.html#Ext.tree.TreeLoader-paramOrder" ext:member="paramOrder" ext:cls="Ext.tree.TreeLoader">paramOrder</a></tt> nullifies this configuration.</div></div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-preloadChildren"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-preloadChildren">preloadChildren</a></b> : Boolean<div class="mdesc">If set to true, the loader recursively loads "children" attributes when doing the first load on nodes.</div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-requestMethod"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-requestMethod">requestMethod</a></b> : String<div class="mdesc">The HTTP request method for loading data (defaults to the value of <a href="output/Ext.Ajax.html#Ext.Ajax-method" ext:member="method" ext:cls="Ext.Ajax">Ext.Ajax.method</a>).</div></td><td class="msource">TreeLoader</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-uiProviders"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-uiProviders">uiProviders</a></b> : Object<div class="mdesc"><div class="short">An object containing properties which&#13;\r
 106 specify custom Ext.tree.TreeNodeUI implementations. If the optional&#13;\r
 107 uiProvide...</div><div class="long">An object containing properties which\r
 108 specify custom <a href="output/Ext.tree.TreeNodeUI.html" ext:cls="Ext.tree.TreeNodeUI">Ext.tree.TreeNodeUI</a> implementations. If the optional\r
 109 <i>uiProvider</i> attribute of a returned child node is a string rather\r
 110 than a reference to a TreeNodeUI implementation, then that string value\r
 111 is used as a property name in the uiProviders object.</div></div></td><td class="msource">TreeLoader</td></tr><tr class="config-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-url"></a><b><a href="source/TreeLoader.html#cfg-Ext.tree.TreeLoader-url">url</a></b> : String<div class="mdesc">Equivalent to <a href="output/Ext.tree.TreeLoader.html#Ext.tree.TreeLoader-dataUrl" ext:member="dataUrl" ext:cls="Ext.tree.TreeLoader">dataUrl</a>.</div></td><td class="msource">TreeLoader</td></tr></tbody></table><a id="Ext.tree.TreeLoader-props"></a><h2>Public Properties</h2><div class="no-members">This class has no public properties.</div><a id="Ext.tree.TreeLoader-methods"></a><h2>Public Methods</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Method</th><th class="msource-header">Defined By</th></tr><tr class="method-row expandable"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-TreeLoader"></a><b><a href="source/TreeLoader.html#cls-Ext.tree.TreeLoader">TreeLoader</a></b>(&nbsp;<code>Object&nbsp;config</code>&nbsp;)\r
 112     <div class="mdesc"><div class="short">Creates a new Treeloader.</div><div class="long">Creates a new Treeloader.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>config</code> : Object<div class="sub-desc">A config object containing config properties.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-addEvents"></a><b><a href="source/Observable.html#method-Ext.util.Observable-addEvents">addEvents</a></b>(&nbsp;<code>Object|String&nbsp;o</code>,&nbsp;<code>string&nbsp;Optional.</code>&nbsp;)\r
 113     :\r
 114                                         void<div class="mdesc"><div class="short">Adds the specified events to the list of events which this Observable may fire.</div><div class="long">Adds the specified events to the list of events which this Observable may fire.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>o</code> : Object|String<div class="sub-desc">Either an object with event names as properties with a value of <code>true</code>
 115 or the first event name string if multiple event names are being passed as separate parameters.</div></li><li><code>Optional.</code> : string<div class="sub-desc">Event name if multiple event names are being passed as separate parameters.
 116 Usage:<pre><code>this.addEvents(<em>'storeloaded'</em>, <em>'storecleared'</em>);</code></pre></div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#addEvents" ext:member="#addEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-addListener"></a><b><a href="source/Observable.html#method-Ext.util.Observable-addListener">addListener</a></b>(&nbsp;<code>String&nbsp;eventName</code>,&nbsp;<code>Function&nbsp;handler</code>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;scope</code>]</span>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;options</code>]</span>&nbsp;)\r
 117     :\r
 118                                         void<div class="mdesc"><div class="short">Appends an event handler to this object.</div><div class="long">Appends an event handler to this object.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to listen for.</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes.</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
 119 <b>If omitted, defaults to the object which fired the event.</b></div></li><li><code>options</code> : Object<div class="sub-desc">(optional) An object containing handler configuration.
 120 properties. This may contain any of the following properties:<ul>
 121 <li><b>scope</b> : Object<div class="sub-desc">The scope (<code><b>this</b></code> reference) in which the handler function is executed.
 122 <b>If omitted, defaults to the object which fired the event.</b></div></li>
 123 <li><b>delay</b> : Number<div class="sub-desc">The number of milliseconds to delay the invocation of the handler after the event fires.</div></li>
 124 <li><b>single</b> : Boolean<div class="sub-desc">True to add a handler to handle just the next firing of the event, and then remove itself.</div></li>
 125 <li><b>buffer</b> : Number<div class="sub-desc">Causes the handler to be scheduled to run in an <a href="output/Ext.util.DelayedTask.html" ext:cls="Ext.util.DelayedTask">Ext.util.DelayedTask</a> delayed
 126 by the specified number of milliseconds. If the event fires again within that time, the original
 127 handler is <em>not</em> invoked, but the new handler is scheduled in its place.</div></li>
 128 <li><b>target</b> : Observable<div class="sub-desc">Only call the handler if the event was fired on the target Observable, <i>not</i>
 129 if the event was bubbled up from a child Observable.</div></li>
 130 </ul><br>
 131 <p>
 132 <b>Combining Options</b><br>
 133 Using the options argument, it is possible to combine different types of listeners:<br>
 134 <br>
 135 A delayed, one-time listener.
 136 <pre><code>myDataView.on(<em>'click'</em>, this.onClick, this, {
 137 single: true,
 138 delay: 100
 139 });</code></pre>
 140 <p>
 141 <b>Attaching multiple handlers in 1 call</b><br>
 142 The method also allows for a single argument to be passed which is a config object containing properties
 143 which specify multiple handlers.
 144 <p>
 145 <pre><code>myGridPanel.on({
 146 <em>'click'</em> : {
 147     fn: this.onClick,
 148     scope: this,
 149     delay: 100
 150 },
 151 <em>'mouseover'</em> : {
 152     fn: this.onMouseOver,
 153     scope: this
 154 },
 155 <em>'mouseout'</em> : {
 156     fn: this.onMouseOut,
 157     scope: this
 158 }
 159 });</code></pre>
 160 <p>
 161 Or a shorthand syntax:<br>
 162 <pre><code>myGridPanel.on({
 163 <em>'click'</em> : this.onClick,
 164 <em>'mouseover'</em> : this.onMouseOver,
 165 <em>'mouseout'</em> : this.onMouseOut,
 166  scope: this
 167 });</code></pre></div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#addListener" ext:member="#addListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-createNode"></a><b><a href="source/TreeLoader.html#method-Ext.tree.TreeLoader-createNode">createNode</a></b>(&nbsp;<code>attr&nbsp;{Object}</code>&nbsp;)\r
 168     :\r
 169                                         void<div class="mdesc"><div class="short">Override this function for custom TreeNode node implementation, or to&#13;\r
 170 modify the attributes at creation time.&#13;\r
 171 Examp...</div><div class="long"><p>Override this function for custom TreeNode node implementation, or to\r
 172 modify the attributes at creation time.</p>\r
 173 Example:<pre><code><b>new</b> Ext.tree.TreePanel({\r
 174     ...\r
 175     loader: <b>new</b> Ext.tree.TreeLoader({\r
 176         url: <em>'dataUrl'</em>,\r
 177         createNode: <b>function</b>(attr) {\r
 178 <i>//          Allow consolidation consignments to have\r</i>
 179 <i>//          consignments dropped into them.\r</i>
 180             <b>if</b> (attr.isConsolidation) {\r
 181                 attr.iconCls = <em>'x-consol'</em>,\r
 182                 attr.allowDrop = true;\r
 183             }\r
 184             <b>return</b> Ext.tree.TreeLoader.prototype.createNode.call(this, attr);\r
 185         }\r
 186     }),\r
 187     ...\r
 188 });</code></pre><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>{Object}</code> : attr<div class="sub-desc">The attributes from which to create the new node.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-enableBubble"></a><b><a href="source/Observable-more.html#method-Ext.util.Observable-enableBubble">enableBubble</a></b>(&nbsp;<code>Object&nbsp;events</code>&nbsp;)\r
 189     :\r
 190                                         void<div class="mdesc"><div class="short">Enables events fired by this Observable to bubble up an owner hierarchy by calling&#13;\r
 191 this.getBubbleTarget() if present...</div><div class="long"><p>Enables events fired by this Observable to bubble up an owner hierarchy by calling\r
 192 <code>this.getBubbleTarget()</code> if present. There is no implementation in the Observable base class.</p>\r
 193 <p>This is commonly used by Ext.Components to bubble events to owner Containers. See <a href="output/Ext.Component.getBubbleTarget.html" ext:cls="Ext.Component.getBubbleTarget">Ext.Component.getBubbleTarget</a>. The default\r
 194 implementation in Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to\r
 195 access the required target more quickly.</p>\r
 196 <p>Example:</p><pre><code>Ext.override(Ext.form.Field, {\r
 197 <i>//  Add functionality to Field<em>'s initComponent to enable the change event to bubble\r</i>
 198     initComponent: Ext.form.Field.prototype.initComponent.createSequence(<b>function</b>() {\r
 199         this.enableBubble('</em>change<em>');\r
 200     }),\r
 201 \r
 202 <i>//  We know that we want Field'</em>s events to bubble directly to the FormPanel.\r</i>
 203     getBubbleTarget: <b>function</b>() {\r
 204         <b>if</b> (!this.formPanel) {\r
 205             this.formPanel = this.findParentByType(<em>'form'</em>);\r
 206         }\r
 207         <b>return</b> this.formPanel;\r
 208     }\r
 209 });\r
 210 \r
 211 <b>var</b> myForm = <b>new</b> Ext.formPanel({\r
 212     title: <em>'User Details'</em>,\r
 213     items: [{\r
 214         ...\r
 215     }],\r
 216     listeners: {\r
 217         change: <b>function</b>() {\r
 218 <i>//          Title goes red <b>if</b> form has been modified.\r</i>
 219             myForm.header.setStyle(<em>"color"</em>, <em>"red"</em>);\r
 220         }\r
 221     }\r
 222 });</code></pre><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>events</code> : Object<div class="sub-desc">The event name to bubble, or an Array of event names.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#enableBubble" ext:member="#enableBubble" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-fireEvent"></a><b><a href="source/Observable.html#method-Ext.util.Observable-fireEvent">fireEvent</a></b>(&nbsp;<code>String&nbsp;eventName</code>,&nbsp;<code>Object...&nbsp;args</code>&nbsp;)\r
 223     :\r
 224                                         Boolean<div class="mdesc"><div class="short">Fires the specified event with the passed parameters (minus the event name).\r
 225 An event may be set to bubble up an Obse...</div><div class="long"><p>Fires the specified event with the passed parameters (minus the event name).</p>
 226 <p>An event may be set to bubble up an Observable parent hierarchy (See <a href="output/Ext.Component.html#Ext.Component-getBubbleTarget" ext:member="getBubbleTarget" ext:cls="Ext.Component">Ext.Component.getBubbleTarget</a>)
 227 by calling <a href="output/Ext.util.Observable.html#Ext.util.Observable-enableBubble" ext:member="enableBubble" ext:cls="Ext.util.Observable">enableBubble</a>.</p><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to fire.</div></li><li><code>args</code> : Object...<div class="sub-desc">Variable number of parameters are passed to handlers.</div></li></ul><strong>Returns:</strong><ul><li><code>Boolean</code><div class="sub-desc">returns false if any of the handlers return false otherwise it returns true.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#fireEvent" ext:member="#fireEvent" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-hasListener"></a><b><a href="source/Observable.html#method-Ext.util.Observable-hasListener">hasListener</a></b>(&nbsp;<code>String&nbsp;eventName</code>&nbsp;)\r
 228     :\r
 229                                         Boolean<div class="mdesc"><div class="short">Checks to see if this object has any listeners for a specified event</div><div class="long">Checks to see if this object has any listeners for a specified event<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to check for</div></li></ul><strong>Returns:</strong><ul><li><code>Boolean</code><div class="sub-desc">True if the event is being listened for, else false</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#hasListener" ext:member="#hasListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-load"></a><b><a href="source/TreeLoader.html#method-Ext.tree.TreeLoader-load">load</a></b>(&nbsp;<code>Ext.tree.TreeNode&nbsp;node</code>,&nbsp;<code>Function&nbsp;callback</code>,&nbsp;<code>(Object)&nbsp;scope</code>&nbsp;)\r
 230     :\r
 231                                         void<div class="mdesc"><div class="short">Load an Ext.tree.TreeNode from the URL specified in the constructor.&#13;\r
 232 This is called automatically when a node is exp...</div><div class="long">Load an <a href="output/Ext.tree.TreeNode.html" ext:cls="Ext.tree.TreeNode">Ext.tree.TreeNode</a> from the URL specified in the constructor.\r
 233 This is called automatically when a node is expanded, but may be used to reload\r
 234 a node (or append new children if the <a href="output/Ext.tree.TreeLoader.html#Ext.tree.TreeLoader-clearOnLoad" ext:member="clearOnLoad" ext:cls="Ext.tree.TreeLoader">clearOnLoad</a> option is false.)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>node</code> : Ext.tree.TreeNode<div class="sub-desc"></div></li><li><code>callback</code> : Function<div class="sub-desc"></div></li><li><code>scope</code> : (Object)<div class="sub-desc"></div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-on"></a><b><a href="source/Observable.html#method-Ext.util.Observable-on">on</a></b>(&nbsp;<code>String&nbsp;eventName</code>,&nbsp;<code>Function&nbsp;handler</code>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;scope</code>]</span>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;options</code>]</span>&nbsp;)\r
 235     :\r
 236                                         void<div class="mdesc"><div class="short">Appends an event handler to this object (shorthand for addListener.)</div><div class="long">Appends an event handler to this object (shorthand for <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a>.)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event to listen for</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
 237 <b>If omitted, defaults to the object which fired the event.</b></div></li><li><code>options</code> : Object<div class="sub-desc">(optional) An object containing handler configuration.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#on" ext:member="#on" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-purgeListeners"></a><b><a href="source/Observable.html#method-Ext.util.Observable-purgeListeners">purgeListeners</a></b>()\r
 238     :\r
 239                                         void<div class="mdesc"><div class="short">Removes all listeners for this object</div><div class="long">Removes all listeners for this object<div class="mdetail-params"><strong>Parameters:</strong><ul><li>None.</li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#purgeListeners" ext:member="#purgeListeners" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-relayEvents"></a><b><a href="source/Observable-more.html#method-Ext.util.Observable-relayEvents">relayEvents</a></b>(&nbsp;<code>Object&nbsp;o</code>,&nbsp;<code>Array&nbsp;events</code>&nbsp;)\r
 240     :\r
 241                                         void<div class="mdesc"><div class="short">Relays selected events from the specified Observable as if the events were fired by this.</div><div class="long">Relays selected events from the specified Observable as if the events were fired by <tt><b>this</b></tt>.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>o</code> : Object<div class="sub-desc">The Observable whose events this object is to relay.</div></li><li><code>events</code> : Array<div class="sub-desc">Array of event names to relay.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#relayEvents" ext:member="#relayEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-removeListener"></a><b><a href="source/Observable.html#method-Ext.util.Observable-removeListener">removeListener</a></b>(&nbsp;<code>String&nbsp;eventName</code>,&nbsp;<code>Function&nbsp;handler</code>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;scope</code>]</span>&nbsp;)\r
 242     :\r
 243                                         void<div class="mdesc"><div class="short">Removes an event handler.</div><div class="long">Removes an event handler.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event the handler was associated with.</div></li><li><code>handler</code> : Function<div class="sub-desc">The handler to remove. <b>This must be a reference to the function passed into the <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> call.</b></div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope originally specified for the handler.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#removeListener" ext:member="#removeListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-resumeEvents"></a><b><a href="source/Observable.html#method-Ext.util.Observable-resumeEvents">resumeEvents</a></b>()\r
 244     :\r
 245                                         void<div class="mdesc"><div class="short">Resume firing events. (see suspendEvents)\r
 246 If events were suspended using the queueSuspended parameter, then all\r
 247 event...</div><div class="long">Resume firing events. (see <a href="output/Ext.util.Observable.html#Ext.util.Observable-suspendEvents" ext:member="suspendEvents" ext:cls="Ext.util.Observable">suspendEvents</a>)
 248 If events were suspended using the <tt><b>queueSuspended</b></tt> parameter, then all
 249 events fired during event suspension will be sent to any listeners now.<div class="mdetail-params"><strong>Parameters:</strong><ul><li>None.</li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#resumeEvents" ext:member="#resumeEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-suspendEvents"></a><b><a href="source/Observable.html#method-Ext.util.Observable-suspendEvents">suspendEvents</a></b>(&nbsp;<code>Boolean&nbsp;queueSuspended</code>&nbsp;)\r
 250     :\r
 251                                         void<div class="mdesc"><div class="short">Suspend the firing of all events. (see resumeEvents)</div><div class="long">Suspend the firing of all events. (see <a href="output/Ext.util.Observable.html#Ext.util.Observable-resumeEvents" ext:member="resumeEvents" ext:cls="Ext.util.Observable">resumeEvents</a>)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>queueSuspended</code> : Boolean<div class="sub-desc">Pass as true to queue up suspended events to be fired
 252 after the <a href="output/Ext.util.Observable.html#Ext.util.Observable-resumeEvents" ext:member="resumeEvents" ext:cls="Ext.util.Observable">resumeEvents</a> call instead of discarding all suspended events;</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#suspendEvents" ext:member="#suspendEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-un"></a><b><a href="source/Observable.html#method-Ext.util.Observable-un">un</a></b>(&nbsp;<code>String&nbsp;eventName</code>,&nbsp;<code>Function&nbsp;handler</code>,&nbsp;<span title="Optional" class="optional">[<code>Object&nbsp;scope</code>]</span>&nbsp;)\r
 253     :\r
 254                                         void<div class="mdesc"><div class="short">Removes an event handler (shorthand for removeListener.)</div><div class="long">Removes an event handler (shorthand for <a href="output/Ext.util.Observable.html#Ext.util.Observable-removeListener" ext:member="removeListener" ext:cls="Ext.util.Observable">removeListener</a>.)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event the handler was associated with.</div></li><li><code>handler</code> : Function<div class="sub-desc">The handler to remove. <b>This must be a reference to the function passed into the <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> call.</b></div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope originally specified for the handler.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#un" ext:member="#un" ext:cls="Ext.util.Observable">Observable</a></td></tr></tbody></table><a id="Ext.tree.TreeLoader-events"></a><h2>Public Events</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Event</th><th class="msource-header">Defined By</th></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-beforeload"></a><b><a href="source/TreeLoader.html#event-Ext.tree.TreeLoader-beforeload">beforeload</a></b> :\r
 255                                       (&nbsp;<code>Object&nbsp;This</code>,&nbsp;<code>Object&nbsp;node</code>,&nbsp;<code>Object&nbsp;callback</code>&nbsp;)\r
 256     <div class="mdesc"><div class="short">Fires before a network request is made to retrieve the Json text which specifies a node's children.</div><div class="long">Fires before a network request is made to retrieve the Json text which specifies a node's children.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>This</code> : Object<div class="sub-desc">TreeLoader object.</div></li><li><code>node</code> : Object<div class="sub-desc">The <a href="output/Ext.tree.TreeNode.html" ext:cls="Ext.tree.TreeNode">Ext.tree.TreeNode</a> object being loaded.</div></li><li><code>callback</code> : Object<div class="sub-desc">The callback function specified in the <a href="output/Ext.tree.TreeLoader.html#Ext.tree.TreeLoader-load" ext:member="load" ext:cls="Ext.tree.TreeLoader">load</a> call.</div></li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-load"></a><b><a href="source/TreeLoader.html#event-Ext.tree.TreeLoader-load">load</a></b> :\r
 257                                       (&nbsp;<code>Object&nbsp;This</code>,&nbsp;<code>Object&nbsp;node</code>,&nbsp;<code>Object&nbsp;response</code>&nbsp;)\r
 258     <div class="mdesc"><div class="short">Fires when the node has been successfuly loaded.</div><div class="long">Fires when the node has been successfuly loaded.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>This</code> : Object<div class="sub-desc">TreeLoader object.</div></li><li><code>node</code> : Object<div class="sub-desc">The <a href="output/Ext.tree.TreeNode.html" ext:cls="Ext.tree.TreeNode">Ext.tree.TreeNode</a> object being loaded.</div></li><li><code>response</code> : Object<div class="sub-desc">The response object containing the data from the server.</div></li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.tree.TreeLoader-loadexception"></a><b><a href="source/TreeLoader.html#event-Ext.tree.TreeLoader-loadexception">loadexception</a></b> :\r
 259                                       (&nbsp;<code>Object&nbsp;This</code>,&nbsp;<code>Object&nbsp;node</code>,&nbsp;<code>Object&nbsp;response</code>&nbsp;)\r
 260     <div class="mdesc"><div class="short">Fires if the network request failed.</div><div class="long">Fires if the network request failed.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>This</code> : Object<div class="sub-desc">TreeLoader object.</div></li><li><code>node</code> : Object<div class="sub-desc">The <a href="output/Ext.tree.TreeNode.html" ext:cls="Ext.tree.TreeNode">Ext.tree.TreeNode</a> object being loaded.</div></li><li><code>response</code> : Object<div class="sub-desc">The response object containing the data from the server.</div></li></ul></div></div></div></td><td class="msource">TreeLoader</td></tr></tbody></table></div>