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jquery zTree asynchronous loading simple example

  • 2021-01-06 00:28:00
  • OfStack

This article explains the jquery zTree asynchronous loading example, to share with you for your reference, the specific content is as follows

web. Servlet is configured as follows: 


<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="2.4"  
  xmlns="http://java.sun.com/xml/ns/j2ee"  
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee  
  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
   
   
  <servlet> 
    <servlet-name>getDataServlet</servlet-name>;  
    <servlet-class>testTree.TestTree</servlet-class>;  
  </servlet> 
   
  <servlet-mapping> 
  <servlet-name>getDataServlet</servlet-name>;  
  <url-pattern>/getData</url-pattern>;  
  </servlet-mapping> 
 
</web-app>

JSP page: 


<!DOCTYPE html> 
<HTML> 
<HEAD> 
  <TITLE> ZTREE DEMO - Simple Data</TITLE> 
  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> 
  <link rel="stylesheet" href="css/demo.css" type="text/css"> 
  <link rel="stylesheet" href="css/zTreeStyle/zTreeStyle.css" type="text/css"> 
  <script type="text/javascript" src="js/jquery-1.4.4.min.js"></script> 
  <script type="text/javascript" src="js/jquery.ztree.core-3.2.js"></script> 
  <script type="text/javascript" src="js/jquery.ztree.excheck-3.2.js"></script> 
  <script type="text/javascript" src="js/jquery.ztree.exedit-3.2.js"></script> 
  <SCRIPT type="text/javascript"> 
    <!-- 
    var setting = { 
      data: { 
        simpleData: { 
          enable: true 
        } 
      } 
      ,async: { 
        enable: true, 
        url:"/testJQuery/getData", 
        autoParam:["id", "name"], 
        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('',''); 
      } 
      return childNodes; 
    } 
    var zNodes =[ 
      { id:1, pId:0, name:"parentNode 1", open:true}, 
      { id:11, pId:1, name:"parentNode 11"}, 
      { id:111, pId:11, name:"leafNode 111"}, 
      { id:112, pId:11, name:"leafNode 112"}, 
      { id:113, pId:11, name:"leafNode 113"}, 
      { id:114, pId:11, name:"leafNode 114"}, 
      { id:12, pId:1, name:"parentNode 12"}, 
      { id:121, pId:12, name:"leafNode 121"}, 
      { id:122, pId:12, name:"leafNode 122"}, 
      { id:123, pId:12, name:"leafNode 123"}, 
      { 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> 
 </HEAD> 
 
<BODY> 
<h1> The simplest tree  --  simple  JSON  data </h1> 
<h6>[  The file path : core/simpleData.html ]</h6> 
<div class="content_wrap"> 
  <div class="zTreeDemoBackground left"> 
    <ul id="treeDemo" class="ztree"></ul> 
  </div> 
</div> 
</BODY> 
</HTML>

Action code: 


public class TestTree extends HttpServlet { 
 
  @Override 
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
//   System.out.println("--------doGet--------"); 
    this.doPost(request, response); 
  } 
 
  @Override 
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
//   System.out.println("--------doPost--------"); 
    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); 
     
    JSONObject json = new JSONObject(); 
    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>();  // The outermost, parent node        
      hm.put("id", id + i);//id attribute   , data transfer   
      hm.put("name", id + i); //name Property that displays the node name   
      hm.put("pId", id); 
       
      list.add(hm); 
    } 
     
    JSONArray arr = new JSONArray(list); 
    json.put("success", true); 
    json.put("arr", arr); 
     
    System.out.println("--------json------" + json.toString()); 
    response.getWriter().write(arr.toString()); 
//   response.getWriter().write(json.toString()); 
//   response.getWriter().write("[{pId:'2',name:'20',id:'20'}]"); 
  } 
 
}

The above is jquery zTree asynchronous loading instance to share with you, I hope to help you learn asynchronous loading technology.

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