我们在做web项目时，常会用到一些树形菜单。在此，我们利用ztree实现树形菜单的效果。zTree 是一个依靠 jQuery 实现的多功能 “树插件”。优异的性能、灵活的配置、多种功能的组合是 zTree 的最大优点。
接下来，我演示一棵简单的ztree，效果如下所示：
案例架构如下：
其中，测试文件index.html内容如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>一棵简单的ztree</title>
<link rel="stylesheet" type="text/css" href="css/zTreeStyle/zTreeStyle.css"/>
<script type="text/javascript" src="js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="js/jquery.ztree.core.js"></script>
<script type="text/javascript">
/**
* 声明一个ztree对象,主要包括三个方面：
* 1.ztree参数配置
* 2.ztree方法
* 3.treeNode节点数据
*/
var ztree;
//ztree参数配置
var setting = {
view: {//视图参数配置
dblClickExpand: false,//取消双击展开样式
showLine: true,//显示树节点之间的连接线
selectedMulti: false//取消多选
},
data: {//数据参数配置
simpleData: {
enable: true, //简单数据格式
idKey: "id",//当前节点数据的键
pIdKey: "pId",//父节点的键
rootPId: ""//根节点的键
}
},
callback: {//回调函数配置
beforeClick: function (treeId, treeNode) {//单击前，传入树的id，以及树节点
var zTree = $.fn.zTree.getZTreeObj("tree");//获取树对象
if (treeNode.isParent) {//如果单击的树节点是一个父节点
zTree.expandNode(treeNode);//就展开该父节点
return false;
} else {
return true;
}
}
}
};
//treeNode节点数据
var ztreeNodes = [
{id: 1, pId: 0, name: "动物", open: true},
{id: 11, pId: 1, name: "无脊椎动物"},
{id: 101, pId: 11, name: "原生动物"},
{id: 10101, pId: 101, name: "草履虫"},
{id: 10102, pId: 101, name: "变形虫"},
{id: 102, pId: 11, name: "腔肠动物"},
{id: 10201, pId: 102, name: "水螅"},
{id: 10202, pId: 102, name: "海蜇"},
{id: 103, pId: 11, name: "扁形动物"},
{id: 10301, pId: 103, name: "涡虫"},
{id: 10302, pId: 103, name: "血吸虫"},
{id: 104, pId: 11, name: "线形动物"},
{id: 10401, pId: 104, name: "蛔虫"},
{id: 10402, pId: 104, name: "线虫"},
{id: 105, pId: 11, name: "环节动物"},
{id: 10501, pId: 105, name: "蚯蚓"},
{id: 10502, pId: 105, name: "沙蚕"},
{id: 106, pId: 11, name: "软体动物"},
{id: 10601, pId: 106, name: "河蚌"},
{id: 10602, pId: 106, name: "章鱼"},
{id: 107, pId: 11, name: "节肢动物"},
{id: 10701, pId: 107, name: "昆虫"},
{id: 10702, pId: 107, name: "虾蟹"},
{id: 10703, pId: 107, name: "蜘蛛"},
{id: 10704, pId: 107, name: "蜈蚣"},
{id: 108, pId: 11, name: "棘皮动物"},
{id: 10801, pId: 108, name: "海胆"},
{id: 10802, pId: 108, name: "海星"},
{id: 10803, pId: 108, name: "海参"},
{id: 12, pId: 1, name: "脊椎动物"},
{id: 201, pId: 12, name: "鱼纲"},
{id: 20101, pId: 201, name: "软骨鱼纲"},
{id: 20101001, pId: 20101, name: "鲨鱼"},
{id: 20101002, pId: 20101, name: "孔鳐"},
{id: 20102, pId: 201, name: "硬骨鱼纲"},
{id: 20102001, pId: 20102, name: "中华青鳞鱼"},
{id: 20102002, pId: 20102, name: "鲤鱼"},
{id: 202, pId: 12, name: "两栖纲"},
{id: 202001, pId: 202, name: "蚓螈"},
{id: 202002, pId: 202, name: "大鲵"},
{id: 202003, pId: 202, name: "蛙"},
{id: 202004, pId: 202, name: "蟾蜍"},
{id: 203, pId: 12, name: "爬行纲"},
{id: 203001, pId: 203, name: "蜥蜴"},
{id: 203002, pId: 203, name: "蛇"},
{id: 203003, pId: 203, name: "龟鳖"},
{id: 203004, pId: 203, name: "鳄鱼"},
{id: 204, pId: 12, name: "鸟纲"},
{id: 204001, pId: 204, name: "鹦鹉"},
{id: 204002, pId: 204, name: "鸭雁"},
{id: 204003, pId: 204, name: "企鹅"},
{id: 204004, pId: 204, name: "鹰"},
{id: 204005, pId: 204, name: "雀"},
{id: 205, pId: 12, name: "哺乳纲"},
{id: 205001, pId: 205, name: "鸭嘴兽"},
{id: 205002, pId: 205, name: "熊虎狮"},
{id: 205003, pId: 205, name: "猴猩"},
{id: 205004, pId: 205, name: "马"},
{id: 205005, pId: 205, name: "羊"},
{id: 205006, pId: 205, name: "骆驼"},
{id: 2, pId: 0, name: "植物", open: true},
{id: 21, pId: 2, name: "绿藻"},
{id: 22, pId: 2, name: "苔藓"},
{id: 23, pId: 2, name: "蕨类植物"},
{id: 24, pId: 2, name: "种子植物"},
{id: 24001, pId: 24, name: "银杏"},
{id: 24002, pId: 24, name: "喇叭花"},
{id: 24003, pId: 24, name: "苹果梨桃杏树"}
];
//DOM文档加载完毕即执行
$(document).ready(function () {
var t = $("#tree");
/**
* zTree 初始化方法：$.fn.zTree.init(t, setting, ztreeNodes)
* t:用于展现 zTree 的 DOM 容器
* setting:zTree 的配置参数
* zNodes:zTree 的节点数据
* 即可生成一棵ztree
*/
t = $.fn.zTree.init(t, setting, ztreeNodes);
});
</script>
</head>
<body>
<ul id="tree" class="ztree" style="width:260px; overflow:auto;"></ul>
</body>
</html>
上述案例中，需要导入ztree框架，请参考下载路径http://files.cnblogs.com/files/zuidongfeng/zTree_v3-master.zip，也可以到ztree官网（http://www.treejs.cn）下载。