任务新增导出

zhongrj

2023-06-27 d74b495736f0c04522ec54274b70fed0ded2878d

 public/map/lib/zTree_v3/api/cn/setting.callback.beforeDrag.html

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   <h2><span>Function(treeId, treeNodes)</span><span class="path">setting.callback.</span>beforeDrag</h2>
   <h3>概述<span class="h3_info">[ 依赖 <span class="highlight_green">jquery.ztree.exedit</span> 扩展 js ]</span></h3>
   <div class="desc">
      <p></p>
      <div class="longdesc">
         <p>用于捕获节点被拖拽之前的事件回调函数，并且根据返回值确定是否允许开启拖拽操作</p>
         <p>默认值：null</p>
      </div>
   </div>
   <h3>Function 参数说明</h3>
   <div class="desc">
   <h4><b>treeId</b><span>String</span></h4>
   <p>被拖拽的节点 treeNodes 所在 zTree 的 <b class="highlight_red">treeId</b>，便于用户操控</p>
   <h4 class="topLine"><b>treeNodes</b><span>Array(JSON)</span></h4>
   <p>要被拖拽的节点 JSON 数据集合</p>
   <p class="highlight_red">v3.x 允许多个同级节点同时被拖拽，因此将此参数修改为 Array(JSON)</p>
   <p class="highlight_red">如果拖拽时多个被选择的节点不是同级关系，则只能拖拽鼠标当前所在位置的节点</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，zTree 将终止拖拽，也无法触发 onDrag / beforeDrop / onDrop 事件回调函数</p>
   </div>
   <h3>setting & function 举例</h3>
   <h4>1. 禁止全部拖拽操作</h4>
   <pre xmlns=""><code>function zTreeBeforeDrag(treeId, treeNodes) {
    return false;
};
var setting = {
   edit: {
      enable: true
   },
   callback: {
      beforeDrag: zTreeBeforeDrag
   }
};
......</code></pre>
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