?<!--Mock<link rel="stylesheet" type="text/css" href="http://localhost/ext/resources/css/ext-all.css" /><link rel="stylesheet" type="text/css" href="http://localhost/ext/doc/resources/docs.css"/><link rel="stylesheet" type="text/css" href="http://localhost/ext/doc/resources/style.css"/>--><style type="text/css">    body {        overflow: scroll;    }    /**	 .mdesc .long {        display: block;    }     */</style><!-- End Mock--><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><div class="body-wrap">    <div class="top-tools">        <a class="inner-link" href="#Ext.tree.TreeLoader-props"><img src="/images/s.gif" class="item-icon icon-prop">Properties</a><a class="inner-link" href="#Ext.tree.TreeLoader-methods"><img src="/images/s.gif" class="item-icon icon-method">Methods</a><a class="inner-link" href="#Ext.tree.TreeLoader-events"><img src="/images/s.gif" class="item-icon icon-event">Events</a><a class="inner-link" href="#Ext.tree.TreeLoader-configs"><img src="/images/s.gif" class="item-icon icon-config">Config Options</a><a class="bookmark" href="../docs/?class=Ext.tree.TreeLoader"><img src="/images/s.gif" class="item-icon icon-fav">Direct Link</a>    </div><h1>Class Ext.tree.TreeLoader</h1>    <table cellspacing="0">        <!--        <tr>        <td class="label">        Package:        </td>        <td class="hd-info">        </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">                Ext.tree.TreeLoader            </td>        </tr>        <tr>            <td class="label">                Extends:            </td>            <td class="hd-info">                Ext.util.Observable            </td>        </tr>    </table>    <div class="description">        樹(shù)加載器（TreeLoader）的目的是從URL延遲加載樹(shù)節(jié)點(diǎn)<a href="###" onClick="alert('Ext.tree.TreeNode');">Ext.tree.TreeNode</a>的子節(jié)點(diǎn)。
  返回值必須是以樹(shù)格式的javascript數(shù)組。
  例如:
  <pre><code>
    [{
        id: 1,
        text: 'A leaf Node',
        leaf: true
    },{
        id: 2,
        text: 'A folder Node',
        children: [{
            id: 3,
            text: 'A child Node',
            leaf: true
        }]
   }]
</code></pre>
  <br><br>
  向服務(wù)端發(fā)送請(qǐng)求后，只有當(dāng)展開(kāi)時(shí)才會(huì)讀取子節(jié)點(diǎn)信息。
  需要取值的節(jié)點(diǎn)id被傳到服務(wù)端并用于產(chǎn)生正確子節(jié)點(diǎn)。
  <br><br>
  當(dāng)需要傳遞更多的參數(shù)時(shí)，可以把一個(gè)事件句柄邦定在"beforeload"事件上，
  然后把數(shù)據(jù)放到TreeLoader的baseParams屬性上：
  <pre><code>
    myTreeLoader.on("beforeload", function(treeLoader, node) {
        this.baseParams.category = node.attributes.category;
    }, this);
</code></pre>
  如上代碼，將會(huì)傳遞一個(gè)該節(jié)點(diǎn)的，名為"category"的參數(shù)到服務(wù)端上    </div>    <div class="hr">    </div>    <a id="Ext.tree.TreeLoader-configs"></a>    <h2>配置項(xiàng)</h2>            <table cellspacing="0" class="member-table">            <tr>                <th class="sig-header" colspan="2">                    配置項(xiàng)                </th>                <th class="msource-header">                    定義者                </th>            </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="dataUrl-header"></a>                        <b>dataUrl</b>                        : String                        <div class="mdesc">                            <div class="short">                                進(jìn)行請(qǐng)求的URL。
                             </div>                            <div class="long">                                進(jìn)行請(qǐng)求的URL。
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="requestMethod-header"></a>                        <b>requestMethod</b>                        : String                        <div class="mdesc">                            <div class="short">                                下載數(shù)據(jù)的HTTP請(qǐng)求方法（默認(rèn)Ext.Ajax#method的值）。
                             </div>                            <div class="long">                                下載數(shù)據(jù)的HTTP請(qǐng)求方法（默認(rèn)<a href="###" onClick="alert('Ext.Ajax#method');">Ext.Ajax#method</a>的值）。
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="url-header"></a>                        <b>url</b>                        : String                        <div class="mdesc">                            <div class="short">                                相當(dāng)于{@link #dataUrl}.
                             </div>                            <div class="long">                                相當(dāng)于{@link #dataUrl}.
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="preloadChildren-header"></a>                        <b>preloadChildren</b>                        : Boolean                        <div class="mdesc">                            <div class="short">                                若為true，則loader在節(jié)點(diǎn)第一次訪問(wèn)時(shí)加載"children"...                             </div>                            <div class="long">                                若為true，則loader在節(jié)點(diǎn)第一次訪問(wèn)時(shí)加載"children"的屬性。
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="baseParams-header"></a>                        <b>baseParams</b>                        : Object                        <div class="mdesc">                            <div class="short">                                (可選) 一個(gè)分別對(duì)每個(gè)節(jié)點(diǎn)進(jìn)行參數(shù)傳遞的集合對(duì)象。
                             </div>                            <div class="long">                                (可選) 一個(gè)分別對(duì)每個(gè)節(jié)點(diǎn)進(jìn)行參數(shù)傳遞的集合對(duì)象。
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="baseAttrs-header"></a>                        <b>baseAttrs</b>                        : Object                        <div class="mdesc">                            <div class="short">                                (可選) 一個(gè)對(duì)所有節(jié)點(diǎn)進(jìn)行參數(shù)傳遞的集合對(duì)象。如果已經(jīng)傳遞這個(gè)參數(shù)了...                             </div>                            <div class="long">                                (可選) 一個(gè)對(duì)所有節(jié)點(diǎn)進(jìn)行參數(shù)傳遞的集合對(duì)象。如果已經(jīng)傳遞這個(gè)參數(shù)了，則他們優(yōu)先。
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="uiProviders-header"></a>                        <b>uiProviders</b>                        : Object                        <div class="mdesc">                            <div class="short">                                (可選) 一個(gè)針對(duì)制定節(jié)點(diǎn) Ext.tree.TreeNodeUI 進(jìn)...                             </div>                            <div class="long">                                (可選) 一個(gè)針對(duì)制定節(jié)點(diǎn) <a href="###" onClick="alert('Ext.tree.TreeNodeUI');">Ext.tree.TreeNodeUI</a> 進(jìn)行參數(shù)傳遞的集合對(duì)象。
    如果傳入了該<i>uiProvider</i>參數(shù)，返回string而非TreeNodeUI對(duì)象
                             </div>                        </div>                    </td>                    <td class="msource">                                                                            TreeLoader                                            </td>                </tr>                            <tr class="config-row expandable">                    <td class="micon">                        <a class="exi" href="#expand">&nbsp;</a>                    </td>                    <td class="sig">                        <a id="clearOnLoad-header"></a>                        <b>clearOnLoad</b>                        : Boolean                        <div class="mdesc">                            <div class="short">                                (可選) 默認(rèn)為true。 在讀取數(shù)據(jù)前移除已存在的節(jié)點(diǎn)。
                             </div>                            <div class="long">                                (可選) 默認(rèn)為true。 在讀取數(shù)據(jù)前移除已存在的節(jié)點(diǎn)。