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-<div class="apiDetail">
-<div>
- <h2><span>Function(treeId, treeNodes, targetNode, moveType, isCopy)</span><span class="path">setting.callback.</span>beforeDrop</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-drop node, zTree based on return value to determine whether to allow drag-drop node.</p>
- <p>Default: null</p>
- <p class="highlight_red">When drop the nodes, if the dragged nodes is not in a valid location, this callback will not triggered, and will restore the original position.</p>
- </div>
- </div>
- <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 targetNode is 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 has been dragged</p>
- <p class="highlight_red">The treeNodes are the data of the nodes which has been dragged, when copy nodes or move nodes.</p>
- <h4 class="topLine"><b>targetNode</b><span>JSON</span></h4>
- <p>JSON data object of the target node which treeNodes are drag-dropped.</p>
- <p class="highlight_red">If the treeNodes will be root node, the targetNode = null</p>
- <h4 class="topLine"><b>moveType</b><span>String</span></h4>
- <p>the relative position of move to the target node</p>
- <p class="highlight_red">"inner": will be child of targetNode</p>
- <p class="highlight_red">"prev": will be sibling node, and be in front of targetNode</p>
- <p class="highlight_red">"next": will be sibling node, and be behind targetNode</p>
- <h4 class="topLine"><b>isCopy</b><span>Boolean</span></h4>
- <p>the flag used to judge copy node or move node</p>
- <p class="highlight_red">true: copy node; false: move node</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 restore the dragged nodes, and will not trigger the 'onDrop' callback.</p>
- </div>
- <h3>Examples of setting & function</h3>
- <h4>1. disable to drag nodes to root</h4>
- <pre xmlns=""><code>function zTreeBeforeDrop(treeId, treeNodes, targetNode, moveType) {
- return !(targetNode == null || (moveType != "inner" && !targetNode.parentTId));
-};
-var setting = {
- edit: {
- enable: true
- },
- callback: {
- beforeDrop: zTreeBeforeDrop
- }
-};
-......</code></pre>
-</div>
-</div> \ No newline at end of file