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<div class="apiDetail">
<div>
<h2><span>Function(treeId, treeNodes)</span><span class="path">setting.callback.</span>beforeDrag</h2>
<h3>Overview<span class="h3_info">[ depends on <span class="highlight_green">jquery.ztree.exedit</span> js ]</span></h3>
<div class="desc">
<p></p>
<div class="longdesc">
<p>Used to capture the event before drag node, zTree based on return value to determine whether to start to drag node.</p>
<p>Default: null</p>
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<h3>Function Parameter Descriptions</h3>
<div class="desc">
<h4><b>treeId</b><span>String</span></h4>
<p>zTree unique identifier: <b class="highlight_red">treeId</b>, the tree is what the treeNodes are belong to, easy for users to control.</p>
<h4 class="topLine"><b>treeNodes</b><span>Array(JSON)</span></h4>
<p>A collection of the nodes which will be dragged</p>
<p class="highlight_red">v3.x allows drag and drop multiple sibling nodes, so this parameter is modified to Array(JSON).</p>
<p class="highlight_red">If the selected nodes aren't the sibling nodes, you can only drag one node which mouse over.</p>
<h4 class="topLine"><b>Return </b><span>Boolean</span></h4>
<p>return true or false</p>
<p class="highlight_red">If return false, zTree will stop drag, and will not trigger the 'onDrag / beforeDrop / onDrop' callback.</p>
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<h3>Examples of setting & function</h3>
<h4>1. disable to drag all node</h4>
<pre xmlns=""><code>function zTreeBeforeDrag(treeId, treeNodes) {
return false;
};
var setting = {
edit: {
enable: true
},
callback: {
beforeDrag: zTreeBeforeDrag
}
};
......</code></pre>
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