1 <div class="apiDetail">
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3 <h2><span>Function(treeId, treeNodes)</span><span class="path">setting.callback.</span>beforeDrag</h2>
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4 <h3>Overview<span class="h3_info">[ depends on <span class="highlight_green">jquery.ztree.exedit</span> js ]</span></h3>
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7 <div class="longdesc">
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8 <p>Used to capture the event before drag node, zTree based on return value to determine whether to start to drag node.</p>
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12 <h3>Function Parameter Descriptions</h3>
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14 <h4><b>treeId</b><span>String</span></h4>
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15 <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>
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16 <h4 class="topLine"><b>treeNodes</b><span>Array(JSON)</span></h4>
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17 <p>A collection of the nodes which will be dragged</p>
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18 <p class="highlight_red">v3.x allows drag and drop multiple sibling nodes, so this parameter is modified to Array(JSON).</p>
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19 <p class="highlight_red">If the selected nodes aren't the sibling nodes, you can only drag one node which mouse over.</p>
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20 <h4 class="topLine"><b>Return </b><span>Boolean</span></h4>
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21 <p>return true or false</p>
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22 <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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24 <h3>Examples of setting & function</h3>
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25 <h4>1. disable to drag all node</h4>
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26 <pre xmlns=""><code>function zTreeBeforeDrag(treeId, treeNodes) {
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34 beforeDrag: zTreeBeforeDrag
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