上一版：点击一级目录展开，再点击时不能收回
完美版：点击一级目录展开，再点击时可以收回
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<title> ZTREE STYLE </title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="css/zTreeStyle.css" type="text/css">
<script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="js/jquery.ztree.core.js"></script>
<script type="text/javascript">
var curMenu = null, zTree_Menu = null;
var setting = {
view: {
showLine: true,
selectedMulti: false,
dblClickExpand: false,
expandSpeed: 500
},
data: {
simpleData: {
enable: true
}
},
callback: {
onNodeCreated: this.onNodeCreated,
beforeClick: this.beforeClick,
onClick: this.onClick
}
};
var zNodes =[
{ id:1, pId:0, name:"主菜单 1", open:true},
{ id:11, pId:1, name:"子菜单 1-1"},
{ id:111, pId:11, name:"叶子节点 1-1-1"},
{ id:112, pId:11, name:"叶子节点 1-1-2"},
{ id:113, pId:11, name:"叶子节点 1-1-3"},
{ id:114, pId:11, name:"叶子节点 1-1-4"},
{ id:12, pId:1, name:"子菜单 1-2"},
{ id:121, pId:12, name:"叶子节点 1-2-1"},
{ id:122, pId:12, name:"叶子节点 1-2-2"},
{ id:123, pId:12, name:"叶子节点 1-2-3"},
{ id:124, pId:12, name:"叶子节点 1-2-4"},
{ id:2, pId:0, name:"主菜单 2"},
{ id:21, pId:2, name:"子菜单 2-1"},
{ id:211, pId:21, name:"叶子节点 2-1-1"},
{ id:212, pId:21, name:"叶子节点 2-1-2"},
{ id:213, pId:21, name:"叶子节点 2-1-3"},
{ id:214, pId:21, name:"叶子节点 2-1-4"},
{ id:22, pId:2, name:"子菜单 2-2"},
{ id:221, pId:22, name:"叶子节点 2-2-1"},
{ id:222, pId:22, name:"叶子节点 2-2-2"},
{ id:223, pId:22, name:"叶子节点 2-2-3"},
{ id:224, pId:22, name:"叶子节点 2-2-4"},
{ id:3, pId:0, name:"主菜单 3"},
{ id:31, pId:3, name:"子菜单 3-1"},
{ id:311, pId:31, name:"叶子节点 3-1-1"},
{ id:312, pId:31, name:"叶子节点 3-1-2"},
{ id:313, pId:31, name:"叶子节点 3-1-3"},
{ id:314, pId:31, name:"叶子节点 3-1-4"},
{ id:32, pId:3, name:"子菜单 3-2"},
{ id:321, pId:32, name:"叶子节点 3-2-1"},
{ id:322, pId:32, name:"叶子节点 3-2-2"},
{ id:323, pId:32, name:"叶子节点 3-2-3"},
{ id:324, pId:32, name:"叶子节点 3-2-4"}
];
function beforeClick(treeId, node) {
var flag = node.open;
if (node.isParent) {
if (node.level === 0) {
var pNode = curMenu;
while (pNode && pNode.level !==0) {
pNode = pNode.getParentNode();
}
if (pNode !== node) {
var a = $("#" + pNode.tId + "_a");
a.removeClass("cur");
zTree_Menu.expandNode(pNode, false);
}
a = $("#" + node.tId + "_a");
a.addClass("cur");
var isOpen = false;
for (var i=0,l=node.children.length; i<l; i++) {
if(node.children[i].open) {
isOpen = true;
break;
}
}
if (isOpen) {
zTree_Menu.expandNode(node, true);
curMenu = node;
} else {
zTree_Menu.expandNode(node.children[0].isParent?node.children[0]:node, true);
curMenu = node.children[0];
}
if (flag) {
zTree_Menu.expandNode(node, false);
} else {
zTree_Menu.expandNode(node, true);
}
} else {
zTree_Menu.expandNode(node);
}
}
return !node.isParent;
}
function onClick(e, treeId, node) {
alert("Do what you want to do!");
}
$(document).ready(function(){
$.fn.zTree.init($("#treeDemo"), setting, zNodes);
zTree_Menu = $.fn.zTree.getZTreeObj("treeDemo");
curMenu = zTree_Menu.getNodes()[0].children[0].children[0];
zTree_Menu.selectNode(curMenu);
var a = $("#" + zTree_Menu.getNodes()[0].tId + "_a");
a.addClass("cur");
});
</script>
<style type="text/css">
.ztree li a.level0 {width:200px;height: 20px; text-align: center; display:block; background-color: #0B61A4; border:1px silver solid;}
.ztree li a.level0.cur {background-color: #66A3D2; }
.ztree li a.level0 span {display: block; color: white; padding-top:3px; font-size:12px; font-weight: bold;word-spacing: 2px;}
.ztree li a.level0 span.button {float:right; margin-left: 10px; visibility: visible;display:none;}
.ztree li span.button.switch.level0 {display:none;}
</style>
</head>
<body>
<div class="content_wrap">
<div class="zTreeDemoBackground left">
<ul id="treeDemo" class="ztree"></ul>
</div>
</div>
</body>
</html>
原文：http://www.cnblogs.com/henuyuxiang/p/6243753.html