setting.callback.beforeDrag.html 1.55 KB
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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>
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		<p></p>
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			<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>
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	<h3>Function 参数说明</h3>
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	<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>
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	<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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