zTree异步加载简单demo

Json 前端之家
前端之家收集整理的这篇文章主要介绍了zTree异步加载简单demo，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

这几天花了些时间,试了试zTree自带的异步加载方式 还不错.

有个奇怪的问题:

无论我在服务器设置 setContentType("text/plain;charset=UTF-8")或是 setContentType("application/json;charset=UTF-8"),zTree都会把接收到的数据当json格式,除非不符合json格式.

(另:JSONBuilder是个简单的json处理类,适用于不复杂的数据格式)

以下是简单的demo

test2.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="css/zTreeStyle/zTreeStyle.css" type="text/css">
<script type="text/javascript" src="script/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="script/jquery.ztree.core-3.2.js"></script>
<script type="text/javascript" src="script/jquery.ztree.excheck-3.2.js"></script>
<title>无标题文档</title>

<script type="text/javascript">
var nodeIcon = "images/4.png";
var groupIcon = "images/1_open.png";

function initTree(){
	var setting = {
		check: {
			enable: true
		},data: {
			simpleData: {
				enable: true
			}
		},async: {
			enable: true,url:"http://localhost/web_test1/action/test2Action.jsp",dataType: "text",dataFilter: ajaxDataFilter,autoParam:["id"]
		}
	};
	
 	/***/
	var zNodes =[		
		{id:"userGroup:__ALL__",name:"全部用户组",open:true},{pId:"userGroup:__ALL__",id:"userGroup:001",name:"用户组_001",isParent:true,open:false,icon:groupIcon},id:"userGroup:002",name:"用户组_002",id:"hostGroup:001",name:"设备组_001",id:"hostGroup:002",name:"设备组_002",icon:groupIcon}
	];
	/***/
	
	$.fn.zTree.init($("#myTree"),setting,zNodes);
}

function ajaxDataFilter(treeId,parentNode,data) {
	//alert(data);
	//alert( $(data).attr("count"));
	var array = [];
	//var jsonp = $.parseJSON(childNodes);
	//var nc = parseInt($(jsonp).attr("count"));
	var nc = parseInt($(data).attr("count"));	
	var _pId = parentNode.id;
	var _id = null;
	var _name = null;	
	
	//alert($(data).attr("id["+ i +"]"));
	//alert("nc:"+nc);
	//alert(parentNode.id);
	for(var i=0; i<nc; i++){	
		//item = {pId:parentNode.id,id:$(jsonp).attr("id["+ i +"]"),name:$(jsonp).attr("name["+ i +"]"),isParent:false,open:true};
		//item = {pId:parentNode.id,id:"test:"+i,name:"test_"+i,open:true};
		_id = $(data).attr("id["+ i +"]");
		_name = $(data).attr("name["+ i +"]");
				
		array[i] = {pId:_pId,id:_id,name:_name,open:true,icon:nodeIcon};		
	}
	
	return array;
}

function old_ajaxDataFilter(treeId,childNodes) {
	//alert(childNodes);
	var txt = "";
	var jsonp = $.parseJSON(childNodes);
	var nc = parseInt($(jsonp).attr("count"));
			
	for(var i=0; i<nc; i++){
		txt += $(jsonp).attr("id["+ i +"]") + "<br/>";
	}
	alert(txt);	

	return null;
}

$(document).ready(function(){
	initTree();
});
</script>

<style type="text/css">
.div_frame{
	width:800px;
	border: 1px solid #a5a4a4;
}	

.div_tree{
	width:300px;
	height:200px;
	overflow:auto;
	border: 1px solid #a5a4a4;	
}
</style>
</head>

<body>
<div class="div_frame">
	<div class="div_tree">
		<ul id="myTree" class="ztree"></ul>
	</div>
</div>
</body>
</html>


test2Action.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" %>
<%@ page pageEncoding="utf-8"%>
<%@ page import="java.util.List" %>
<%@ page import="java.util.LinkedList" %>
<%@ page import="java.io.PrintWriter" %>
<%@ page import="org.sl.json.JSONBuilder" %>
<%@ page import="java.util.Random" %>
<!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>
<%
// String json = "{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}";
//String json = "{\"count\":\"2\",\"name[0]\":\"name_0\",\"name[1]\":\"name_1\",}";
String json = null;
Random rand = new Random(System.currentTimeMillis());
int count = rand.nextInt(8)+2;
JSONBuilder js = new JSONBuilder();

js.put("count",""+count);
for(int i=0; i<count; i++){
	js.put("id["+ i +"]","test:"+i);
	js.put("name["+ i +"]","test:"+i);
}

json = js.toJsonString();

String id = request.getParameter("id");
System.out.println("id:" + id);


//json => application/json text/x-json 

// response.setContentType("text/plain;charset=UTF-8");
response.setContentType("application/json;charset=UTF-8");
response.setCharacterEncoding("UTF-8"); 
PrintWriter pw = response.getWriter(); 
pw.write(json); 
pw.flush(); 
pw.close();
%>
</head>
<body>

</body>
</html>


JSONBuilder.java

package org.sl.json;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

/**
 * 可以用来处理格式比较简单的json字符串
 * @author shanl
 *
 */
public class JSONBuilder {
//	private Properties dict = new Properties();
	private Map<String,String> dict = new LinkedHashMap<String,String>(20);
	
	/**
	 * 写入一个键/值对
	 * @param key
	 * @param value
	 */
	public void put(String key,String value){		
		this.dict.put(replaceJsonChar(key),replaceJsonChar(value));
	}
	
	private String replaceJsonChar(String str){
		StringBuilder sb = new StringBuilder();		
		char[] chs = str.tocharArray();
		
		for(char c: chs){
			switch (c) { 
	        case '\"': 
	            sb.append("\\\""); 
	            break; 
	        case '\\': 
	            sb.append("\\\\"); 
	            break; 
	        case '/': 
	            sb.append("\\/"); 
	            break; 
	        case '\b': 
	            sb.append("\\b"); 
	            break; 
	        case '\f': 
	            sb.append("\\f"); 
	            break; 
	        case '\n': 
	            sb.append("\\n"); 
	            break; 
	        case '\r': 
	            sb.append("\\r"); 
	            break; 
	        case '\t': 
	            sb.append("\\t"); 
	            break; 
	        default: 
	            sb.append(c); 
	        } 
		}
		
		return sb.toString();
	}
	
	/**
	 * 返回键/值对列表
	 * @return
	 */
	public Map<String,String> getDict(){
		return dict;
	}
	
	/**
	 * 返回键所对应的值
	 * @param key
	 * @return
	 */
	public String getValue(String key){
		return dict.get(key);
	}
	
	/**
	 * 解析json格式字符串
	 * @param json
	 */
	public void parseJsonString(String json){
		String _json = json;
		String[] ss = null;
		String[] tmp = null;		
		
		_json = _json.trim(); //去掉两端空格
		_json = _json.substring(2); //去掉 {"
		_json = _json.substring(0,_json.length()-2); //去掉 }"
		
		ss = _json.split("\",\"");
		for(String s: ss){
			tmp = s.split("\":\"");
			put(tmp[0],tmp[1]);
		}
	}
	
	/**
	 * 将数据转换成json格式字符串
	 * @return
	 */
	public String toJsonString(){
		String sb = "";
		String key = null;
		String value = null;
		Iterator<String> keys = dict.keySet().iterator();
//		Enumeration keys = dict.propertyNames(); 
		
		sb += "{";
		
		while(keys.hasNext()){
			key = keys.next();
			value = dict.get(key);
			
			sb += "\""+ key +"\":";
			sb += "\""+ value +"\",";
		}
		
		if(sb.endsWith(",") ){
			sb = sb.substring(0,sb.length()-1);
		}
		
		sb += "}";
		
		return sb.toString();
	}
	
	public String toString(){
		return toJsonString();
	}
}


JSONBuilder测试类,Test2.java:

package test1;

import org.sl.json.JSONBuilder;

public class Test2 {
	public static void main(String[] args){
		t7();		
//		t1();
	}
	
	static void t7(){
		String str = "{\"count\":\"3\",\"id[2]\":\"id_2\"}";
		JSONBuilder js = new JSONBuilder();
		js.parseJsonString(str);
		
		System.out.println(js.getValue("id[1]"));
	}
	
	static void t6(){
		JSONBuilder js = new JSONBuilder();
		js.put("abc\"sasas","sasjajsas\"saas");
		
		System.out.println(js.toJsonString());
	}
	
	static void t5(){
		String str = "{\"count\":\"3\",\"id[2]\":\"id_2\"}";
		JSONBuilder js = new JSONBuilder();
		
		js.parseJsonString(str);
		System.out.println(js.getValue("count"));
		System.out.println(js.getValue("id[0]"));
	}
	
	static void t4(){
		String str = "'{\"count\":\"3\",\"id[2]\":\"id_2\"}'";
		JSONBuilder js = new JSONBuilder();
		
		js.parseJsonString(str);
		System.out.println(js.getValue("count"));
	}
	
	static void t3(){
		String str = "'{\"count\":\"3\",\"id[2]\":\"id_2\"}'";
		String[] ss = str.split("\",\"");
		
		for(String s: ss){
			System.out.println(s);
		}
	}
	
	static void t2(){
		JSONBuilder js = new JSONBuilder();
		String str = "'{\"count\":\"3\",\"id[2]\":\"id_2\"}'";
		str = str.trim();
		str = str.substring(3);
		str = str.substring(0,str.length()-3);
		
		System.out.println(str);
		System.out.println();
		
		String[] tmp = null;
		String[] ss = str.split("\",\"");
		
		for(String s: ss){
			tmp = s.split("\":\"");
			js.put(tmp[0],tmp[1]);
		}
		
		System.out.println(js.getValue("count"));
	}
	
	static public void t1(){
		JSONBuilder js = new JSONBuilder();
		int c = 3;
		
		js.put("count",c+"");
		
		for(int i=0; i<c; i++){
			js.put("id["+ i +"]","id_"+i);
		}
		
		System.out.println(js.toJsonString());
	}
}
原文链接：https://www.f2er.com/json/290638.html

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