<div class="apiDetail">
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<div>
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<h2><span>Function(treeId, treeNode)</span><span class="path">setting.callback.</span>beforeAsync</h2>
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<h3>概述<span class="h3_info">[ 依赖 <span class="highlight_green">jquery.ztree.core</span> 核心 js ]</span></h3>
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<div class="desc">
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<p></p>
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<div class="longdesc">
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<p>用于捕获异步加载之前的事件回调函数，zTree 根据返回值确定是否允许进行异步加载</p>
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<p>默认值：null</p>
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</div>
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</div>
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<h3>Function 参数说明</h3>
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<div class="desc">
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<h4><b>treeId</b><span>String</span></h4>
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<p>对应 zTree 的 <b class="highlight_red">treeId</b>，便于用户操控</p>
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<h4 class="topLine"><b>treeNode</b><span>JSON</span></h4>
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<p>进行异步加载的父节点 JSON 数据对象</p>
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<p class="highlight_red">针对根进行异步加载时，treeNode = null</p>
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<h4 class="topLine"><b>返回值</b><span>Boolean</span></h4>
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<p>返回值是 true / false</p>
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<p class="highlight_red">如果返回 false，zTree 将不进行异步加载，也无法触发 onAsyncSuccess / onAsyncError 事件回调函数</p>
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</div>
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<h3>setting & function 举例</h3>
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<h4>1. 禁止 id 为 1 的父节点进行异步加载操作</h4>
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<pre xmlns=""><code>function zTreeBeforeAsync(treeId, treeNode) {
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return (treeNode.id !== 1);
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};
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var setting = {
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callback: {
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beforeAsync: zTreeBeforeAsync
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}
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};
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......</code></pre>
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</div>
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</div>
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