v2版本正式上线测试版

static/zTree3/api/en/setting.callback.beforeDrag.html

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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>Specify callback function to be called before the drag node callback, The return value controls whether the drag node callback will execute.</p>
+			<p>Default: null</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 id of the containing tree.</p>
+	<h4 class="topLine"><b>treeNodes</b><span>Array(JSON)</span></h4>
+	<p>A collection of the nodes being dragged</p>
+	<p class="highlight_red">v3.x allows the drag and drop of multiple sibling nodes, so this parameter's type is changed to Array(JSON).</p>
+	<p class="highlight_red">If the selected nodes aren't sibling nodes, you can only drag one 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 abort the drag and drop, and will not trigger the 'onDrag / beforeDrop / onDrop' sequence of callbacks.</p>
+	</div>
+	<h3>Examples of setting & function</h3>
+	<h4>1. disable drag completely (by returning false)</h4>
+	<pre xmlns=""><code>function myBeforeDrag(treeId, treeNodes) {
+    return false;
+};
+var setting = {
+	edit: {
+		enable: true
+	},
+	callback: {
+		beforeDrag: myBeforeDrag
+	}
+};
+......</code></pre>
+</div>
+</div>