jquery zTree异步加载简单实例分享

首先提供Ztree官方网站http://www.ztree.me。
Ztree是一个使用jQuery实现的JSP页面的各种功能树，本文介绍一个异步获取数据到下拉树的实现方式。
当前版本Ztree 3.5.01
simple.html
复制代码 代码如下:

js
复制代码 代码如下:
var setting = {
data: {
simpledata: {
enable: true
// idKey:"id",
// pIdKey:"pId",
}
}
,async: {
enable: true,
url:"/Java_Solr/servlet/ZTreeSerlvet",
autoParam:["id", "name"],
otherParam:{"otherParam":"zTreeAsyncTest"},
// dataType: "text",//默认text
// type:"get",//默认post
dataFilter: filter //异步返回后经过Filter
}
,callback:{
// beforeAsync: zTreeBeforeAsync, // 异步加载事件之前得到相应信息
asyncSuccess: zTreeOnAsyncSuccess,//异步加载成功的fun
asyncError: zTreeOnAsyncError, //加载错误的fun
beforeClick:beforeClick //捕获单击节点之前的事件回调函数
}
};
//treeId是treeDemo
function filter(treeId, parentNode, childNodes) {
if (!childNodes) return null;
for (var i=0, l=childNodes.length; ichildNodes[i].name = childNodes[i].name.replace('','');
}
return childNodes;
}
function beforeClick(treeId,treeNode){
if(!treeNode.isParent){
alert("请选择父节点");
return false;
}else{
return true;
}
}
function zTreeonAsyncError(event, treeId, treeNode){
alert("异步加载失败!");
}
function zTreeonAsyncSuccess(event, treeId, treeNode, msg){

}

var zNodes=[];

$(document).ready(function(){
$.fn.zTree.init($("#treeDemo"), setting, zNodes);
});

得到zTree对象 :var zTree = $.fn.zTree.getZTreeObj("treeDemo"),
ZtreeServlet
复制代码 代码如下:
package org.hzy.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hzy.bean.ZtreeBean;
import com.alibaba.fastjson.JSON;
public class ZTreeSerlvet extends HttpServlet {
public void destroy() {
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println(request.getParameter("id") + " " + request.getParameter("name") + " " + request.getParameter("otherParam"));
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
ZtreeBean zb = new ZtreeBean(0, -1, "zb", true);
ZtreeBean zb1 = new ZtreeBean(1, 0, "zb1", true);
ZtreeBean zb2 = new ZtreeBean(2, 1, "zb2", false);
ZtreeBean zb3 = new ZtreeBean(2, 0, "zbss", true);
List list = new ArrayList();
list.add(zb);
list.add(zb1);
list.add(zb2);
list.add(zb3);
String str = JSON.toJSonString(list);
out.print(str);
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
public void init() throws ServletException {
}
}