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<div class="apiDetail">
<div>
<h2><span>Function(treeId, treeNode)</span><span class="path">setting.callback.</span>beforeMouseDown</h2>
<h3>概述<span class="h3_info">[ 依赖 <span class="highlight_green">jquery.ztree.core</span> 核心 js ]</span></h3>
<div class="desc">
<p></p>
<div class="longdesc">
<p>用于捕获 zTree 上鼠标按键按下之前的事件回调函数，并且根据返回值确定触发 onMouseDown 事件回调函数</p>
<p>默认值：null</p>
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<h3>Function 参数说明</h3>
<div class="desc">
<h4><b>treeId</b><span>String</span></h4>
<p>对应 zTree 的 <b class="highlight_red">treeId</b>，便于用户操控</p>
<h4 class="topLine"><b>treeNode</b><span>JSON</span></h4>
<p>鼠标按键按下时所在节点的 JSON 数据对象</p>
<p class="highlight_red">如果不在节点上，则返回 null</p>
<h4 class="topLine"><b>返回值</b><span>Boolean</span></h4>
<p>返回值是 true / false</p>
<p class="highlight_red">如果返回 false，将仅仅无法触发 onMouseDown 事件回调函数，对其他操作无任何影响</p>
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<h3>setting & function 举例</h3>
<h4>1. 禁止 onMouseDown 事件</h4>
<pre xmlns=""><code>function zTreeBeforeMouseDown(treeId, treeNode) {
return false;
};
var setting = {
callback: {
beforeMouseDown: zTreeBeforeMouseDown
}
};
......</code></pre>
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