jquery ztree实现下拉树形框使用到了json数据

公司最近的项目需要用到树形下拉框，在网上找了挺多源码，最后还是采用了zTree来实现，因为代码的移植性比较高，而且数据的获取比较容易。废话不多说，直接上代码。

index.jsp

<%@ page language="java" pageEncoding="UTF-8"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%> 
<html> 
<head> 
<link rel="stylesheet" href="<c:url value='/js/ztree/css/demo.css'/>" type="text/css"></link> 
<link rel="stylesheet" href="<c:url value='/js/ztree/css/zTreeStyle/zTreeStyle.css'/>" type="text/css"></link> 
<script type="text/javascript" src="<c:url value='/js/ztree/js/jquery-1.4.4.min.js'/>"></script> 
<script type="text/javascript" src="<c:url value='/js/ztree/js/jquery.ztree.core-3.5.js'/>"></script> 
<SCRIPT type="text/javascript"> 
<!-- 
var setting = { 
view: { 
dblClickExpand: false 
}, 
data: { 
simpleData: { 
enable: true 
} 
}, 
callback: { 
beforeClick: beforeClick, 
onClick: onClick 
} 
}; 

//json数据源，也可以从后台读取json字符串，并转换成json对象，如下所示 
//var strNodes = '${jsonList}'; 
//var zNodes = eval("("+strNodes+")"); //将json字符串转换成json对象数组，strNode一定要加"（）"，不然转不成功 
var zNodes =[ 
{id:1, pId:0, name:"北京"}, 
{id:2, pId:0, name:"天津"}, 
{id:3, pId:0, name:"上海"}, 
{id:6, pId:0, name:"重庆"}, 
{id:4, pId:0, name:"河北省", open:true}, 
{id:41, pId:4, name:"石家庄"}, 
{id:42, pId:4, name:"保定"}, 
{id:43, pId:4, name:"邯郸"}, 
{id:44, pId:4, name:"承德"}, 
{id:5, pId:0, name:"广东省", open:true}, 
{id:51, pId:5, name:"广州"}, 
{id:52, pId:5, name:"深圳"}, 
{id:53, pId:5, name:"东莞"}, 
{id:54, pId:5, name:"佛山"}, 
{id:6, pId:0, name:"福建省", open:true}, 
{id:61, pId:6, name:"福州"}, 
{id:62, pId:6, name:"厦门"}, 
{id:63, pId:6, name:"泉州"}, 
{id:64, pId:6, name:"三明"} 
]; 

function beforeClick(treeId, treeNode) { 
var check = (treeNode && !treeNode.isParent); 
if (!check) alert("只能选择城市..."); 
return check; 
} 

function onClick(e, treeId, treeNode) { 
var zTree = $.fn.zTree.getZTreeObj("treeDemo"), 
nodes = zTree.getSelectedNodes(), 
v = ""; 
nodes.sort(function compare(a,b){return a.id-b.id;}); 
for (var i=0, l=nodes.length; i<l; i++) { 
v += nodes[i].name + ","; 
} 
if (v.length > 0 ) v = v.substring(0, v.length-1); 
var cityObj = $("#citySel"); 
cityObj.attr("value", v); 
} 

function showMenu() { 
var cityObj = $("#citySel"); 
var cityOffset = $("#citySel").offset(); 
$("#menuContent").css({left:cityOffset.left + "px", top:cityOffset.top + cityObj.outerHeight() + "px"}).slideDown("fast"); 

$("body").bind("mousedown", onBodyDown); 
} 
function hideMenu() { 
$("#menuContent").fadeOut("fast"); 
$("body").unbind("mousedown", onBodyDown); 
} 
function onBodyDown(event) { 
if (!(event.target.id == "menuBtn" || event.target.id == "menuContent" || $(event.target).parents("#menuContent").length>0)) { 
hideMenu(); 
} 
} 

$(document).ready(function(){ 
$.fn.zTree.init($("#treeDemo"), setting, zNodes); 
}); 
//--> 
</SCRIPT> 
</head> 
<body> 
<div class="zTreeDemoBackground left"> 
<ul class="list"> 
<li class="title"> <span class="highlight_red">选择城市时，按下 Ctrl 或 Cmd 键可以进行多选</span></li> 
<li class="title"> 城市：<input id="citySel" type="text" readonly value="" style="width:120px;"/> 
<a id="menuBtn" href="#" onclick="showMenu(); return false;">选择</a></li> 
</ul> 
</div> 
<div id="menuContent" class="menuContent" style="display:none; position: absolute;"> 
<ul id="treeDemo" class="ztree" style="margin-top:0; width:160px;"></ul> 
</div> 
</body> 
</html> 

spring后台

json数据类

复制代码代码如下:

public class EquipTypeJson { 
private String id; 
private String pId; 
private String name; 

public String getId() { 
return id; 
} 
public void setId(String id) { 
this.id = id; 
} 
public String getPId() { 
return pId; 
} 
public void setPId(String pId) { 
this.pId = pId; 
} 
public String getName() { 
return name; 
} 
public void setName(String name) { 
this.name = name; 
} 


} 

controller页面

复制代码代码如下:

public ModelAndView List(HttpServletRequest request, HttpServletResponse response,Product prod) throws Exception { 
Map map=new HashMap(); 
List<EquipTypeJson> list = testService.getAllEquipType();//数据库中获取源数据 
JSONArray jsonArray = JSONArray.fromObject(list); //将list数据转为json对象 
String json = jsonArray.toString(); //将json对象转为字符串 
map.put("jsonList", json); 
return new ModelAndView("equip/List").addAllObjects(map); 
} 