<div class="apiDetail">
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<div>
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<h2><span>Function(treeId, treeNode, clickFlag)</span><span class="path">setting.callback.</span>beforeClick</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>用于捕获单击节点之前的事件回调函数，并且根据返回值确定是否允许单击操作</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>被单击的节点 JSON 数据对象</p>
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<h4 class="topLine"><b>clickFlag</b><span>Number</span></h4>
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<p>节点被点击后的选中操作类型，详细看下表</p>
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<table width="100%" border="0" cellspacing="1" cellpadding="0">
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<thead><tr><td>clickFlag</td><td title="是否允许多点选中">selectedMulti</td><td title="是否按下 Ctrl 或 Cmd 键">autoCancelSelected<br/>&&<br/>event.ctrlKey / metaKey</td><td title="节点当前选择状态">isSelected</td><td>选中操作</td></tr></thead>
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<tbody>
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<tr><td>1</td><td>true</td><td>false</td><td>false</td><td>普通选中</td></tr>
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<tr><td>1</td><td>true</td><td>false</td><td>true</td><td>普通选中</td></tr>
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<tr><td>2</td><td>true</td><td>true</td><td>false</td><td>追加选中</td></tr>
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<tr><td>0</td><td>true</td><td>true</td><td>true</td><td>取消选中</td></tr>
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<tr><td>1</td><td>false</td><td>false</td><td>false</td><td>普通选中</td></tr>
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<tr><td>1</td><td>false</td><td>false</td><td>true</td><td>普通选中</td></tr>
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<tr><td>1</td><td>false</td><td>true</td><td>false</td><td>普通选中</td></tr>
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<tr><td>0</td><td>false</td><td>true</td><td>true</td><td>取消选中</td></tr>
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</tbody>
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</table>
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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 将不会选中节点，也无法触发 onClick 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. 禁止节点被选中</h4>
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<pre xmlns=""><code>function zTreeBeforeClick(treeId, treeNode, clickFlag) {
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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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beforeClick: zTreeBeforeClick
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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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