JQuery ztree asynchronous loading example explanation

JQuery ztree asynchronous loading example explanation_jquery

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Release： 2016-05-16 15:13:42

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Originally, I wanted to make a file directory browsing interface, which required traversing all files and directories. Obviously, reading it all at once is very time-consuming and laborious.

So you need to do asynchronous loading....

Preparation:

1 Download JQuery ZTree

Just copy the JS and CSS. In fact, there is no need to include so many, just use whatever you want.

2 requires fastJSON to convert JSON objects

After I downloaded the JAR package and imported it into Eclipse, I always received a class not found error.

Solution: Place the jar package under WEB-INF/lib.

Code example:

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
  pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
  <link rel="stylesheet" href="resources/css/demo.css" type="text/css">
  <link rel="stylesheet" href="resources/css/zTreeStyle/zTreeStyle.css" type="text/css">
  <script type="text/javascript" src="resources/js/jquery-1.4.4.min.js"></script>
  <script type="text/javascript" src="resources/js/jquery.ztree.core-3.5.js"></script>
  
</head>
<body>
  <div class="zTreeDemoBackground left">
    <ul id="treeDemo" class="ztree"></ul>
  </div>
  <SCRIPT type="text/javascript">
    var setting = { 
        data: { 
          simpleData: { 
            enable: true 
          } 
        } ,
        async: {
          enable: true,
          url:"/TestZTree/test",
          autoParam:["id", "name", "level"],
          otherParam:{"otherParam":"zTreeAsyncTest"},
          dataFilter: filter
        }
    }; 
    function filter(treeId, parentNode, childNodes) {
      if (!childNodes) return null;
      for (var i=0, l=childNodes.length; i<l; i++) {
        childNodes[i].name = childNodes[i].name.replace(/\.n/g, '.');
      }
      return childNodes;
    }
    var zNodes =[ 
      { id:1, pId:0, name:"parentNode 1", open:true}, 
      { id:11, pId:1, name:"parentNode 11",isParent:true}, 
      { id:111, pId:11, name:"leafNode 111"}, 
      { id:112, pId:11, name:"leafNode 112"}, 
      { id:12, pId:1, name:"parentNode 12",isParent:true}, 
      { id:121, pId:12, name:"leafNode 121"}, 
      { id:13, pId:1, name:"parentNode 13", isParent:true}, 
      { id:2, pId:0, name:"parentNode 2", isParent:true} 
    ]; 
 
    $(document).ready(function(){ 
      $.fn.zTree.init($("#treeDemo"), setting, zNodes); 
    }); 
  </SCRIPT>
</body>
</html>

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testServlet.java

package com.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class testServlet extends HttpServlet{
  @Override 
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    doPost(request, response); 
  } 
 
  @Override 
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    String id = request.getParameter("id"); 
    String name = request.getParameter("name"); 
    String level = request.getParameter("level"); 
    String otherParam = request.getParameter("otherParam"); 
    System.out.println(id + "|" + name + "|" + level + "|" + otherParam); 
     
    List<HashMap<String,Object>> list = new ArrayList<HashMap<String,Object>>(); 
    for(int i = 0; i < 5; i++){ 
      HashMap<String,Object> hm = new HashMap<String,Object>();  //最外层，父节点       
      hm.put("id",id+i);//id属性 ，数据传递  
      hm.put("name", id+i); //name属性，显示节点名称  
      hm.put("pId", id); 
       
      list.add(hm); 
    } 
    response.getWriter().write(JSON.toJSONString(list)); 
  } 
}

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web.xml

<&#63;xml version="1.0" encoding="UTF-8"&#63;>
<web-app version="2.5" 
  xmlns="http://java.sun.com/xml/ns/javaee" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <display-name></display-name>
 <servlet>
  <servlet-name>testServlet</servlet-name>
  <servlet-class>com.test.testServlet</servlet-class>
 </servlet>

 <servlet-mapping>
  <servlet-name>testServlet</servlet-name>
  <url-pattern>/test</url-pattern>
 </servlet-mapping>
   
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

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Rendering:

The above is about jquery asynchronous loading. I hope it will be helpful to everyone learning jquery programming.