Jquery zTree演示程序Demo总结

Demo 演示

http://www.ztree.me/v3/demo.php

前言：
最近的项目需要用到zTree树，于是想将zTree树总结一下。前段时间一直没有时间总结，趁国庆还有这么点时间，总结一下。zTree树控件是基于Jquery的，官方提供了很好的API文档和Demo

用户可以从如下地址下载：http://www.ztree.me/hunter/zTree.html

1.帮助文档和API
zTree的帮助文档和API都是非常全面的，只是有些Demo的后台是用PHP写的，因此，如果想看更加全面的Demo的话，最好将帮组文档发布到本地的Apache服务器上。
2.用一个Demo来演示Jquery zTree的功能
要点：
2.1 zTree树的数据源为JSON格式
2.2 zTree树控件的信息是通过请求url动态加载的
2.3 zTree树的onClick函数，点击树的任意一个节点后，就会调用
3.Demo演示
3.1 页面布局
为了能较为全面的演示zTree树的功能，布局大致如下，左边是树行结构，右边是主页面。

index.jsp的代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
  String path = request.getContextPath();
  String basePath = request.getScheme() + "://"
      + request.getServerName() + ":" + request.getServerPort()
      + path + "/";
%>
<!DOCTYPE html>
<html>
  <head>
    <title>Jquery zTree</title>
    <link rel="stylesheet" type="text/css" href="css/easyui.css">
      <link rel="stylesheet" type="text/css" href="css/icon.css" />
      <link rel="stylesheet" type="text/css" href="css/main.css" />
    <link rel="stylesheet" type="text/css" href="zTree/css/zTreeStyle/zTreeStyle.css"/>
    <link rel="stylesheet" type="text/css" href="zTree/css/demo.css"/>
    <script type="text/javascript" src="js/jquery.min.js"></script>
      <script type="text/javascript" src="js/jquery.easyui.min.js"></script>
      <script type="text/javascript" src="zTree/js/jquery.ztree.all-3.5.js"></script>
    <script type="text/javascript" src="js/index.js"></script>
  </head>
  <body id="main" class="easyui-layout">
    <div data-options="region:'west',split:true" title="Jquery zTree演示" style="width: 180px;  overflow: auto; ">
      <div class="easyui-accordion" data-options="fit:true,border:false">
        <div style="z-index:12754; border: 1px solid lightgray; background: white; width: 150px; height: 35px; display: none; padding: 4px;" id="treeLoadMsg">
          <img src="images/loading.gif" style="vertical-align: middle;" width="32" height="32"/>
          <span>Loading...</span>
        </div>
            <ul id="treeDemo" class="ztree"></ul>
      </div>
    </div>
    <div data-options="region:'center'" title="main" style="overflow: hidden;">
      <iframe id="iframepage" src="default.jsp" style=" background: white;border: 1px; width: 100%; height: 100%; padding: 0;"></iframe>
    </div>
  </body>
</html>

为了不污染原有的静态页面，我们将index.jsp文件封装在index.js文件中，代码如下：（注意注释）

/**
 * 设置zTree树
 */
var setting = {
  async: {
    enable: true,
    url: getUrlByNodeId
  },
  check: {
    enable: false
  },
  data: {
    simpleData: {
      enable: true
    }
  },
  view: {
    expandSpeed: ""
  },
  callback: {
    beforeExpand: beforeExpand,
    onAsyncSuccess: onAsyncSuccess,
    onAsyncError: onAsyncError,
    onClick: zTreeOnClick
  }
};
var zNodes =[
  {name:"经典视频检索", id:"1",isParent:true,iconOpen:"zTree/css/zTreeStyle/img/diy/1_open.png", iconClose:"zTree/css/zTreeStyle/img/diy/1_close.png"},
  {name:"基于内容检索", id:"2",isParent:true,iconOpen:"zTree/css/zTreeStyle/img/diy/1_open.png", iconClose:"zTree/css/zTreeStyle/img/diy/1_close.png"},
  {name:"基于语义检索", id:"3",isParent:true,iconOpen:"zTree/css/zTreeStyle/img/diy/1_open.png", iconClose:"zTree/css/zTreeStyle/img/diy/1_close.png"}
];
/**
 * @author ZhengHaibo
 * 功能：通过NodeId获得节点的孩子节点
 * 调用：当父节点展开时，调用，返回该父节点的子节点
 * 后台数据格式：JSON
 * @param treeId 树控件的Id
 * @param treeNode 树节点对象：包含Id等信息
 * @return
 */
function getUrlByNodeId(treeId, treeNode) {
  return "getNodesDataById?treeNodeId="+treeNode.id;
}
/**
 * 展开之前执行的函数
 * @param treeId
 * @param treeNode
 * @return
 */
function beforeExpand(treeId, treeNode) {
  if (!treeNode.isAjaxing) {
    ajaxGetNodes(treeNode, "refresh");
    return true;
  } else {
    alert("Loading...");
    return false;
  }
}
/**
 * 加载成功后执行的函数
 * @param event 封装了js的事件
 * @param treeId 树控件的Id
 * @param treeNode 树节点对象
 * @param msg 返回的JSON格式的消息
 * @return
 */
function onAsyncSuccess(event, treeId, treeNode, msg) {
    console.log("treeId");
    console.log(treeId);
    console.log("treeNode");
    console.log(treeNode);
    console.log("msg");
    console.log(msg);
  if (!msg || msg.length == 0) {
    return;
  }
  var zTree = $.fn.zTree.getZTreeObj("treeDemo");
  treeNode.icon = "";
  zTree.updateNode(treeNode);//更新树结构
  zTree.selectNode(treeNode.children[0]);//设置为第一个子节点为选中状态
}
function onAsyncError(event, treeId, treeNode, XMLHttpRequest, textStatus, errorThrown) {
  var zTree = $.fn.zTree.getZTreeObj("treeDemo");
  alert("Error ! 异步获取数据异常");
  treeNode.icon = "";
  zTree.updateNode(treeNode);
}
function ajaxGetNodes(treeNode, reloadType) {
  var zTree = $.fn.zTree.getZTreeObj("treeDemo");
  if (reloadType == "refresh") {
    treeNode.icon = "zTree/css/zTreeStyle/img/loading.gif";
    zTree.updateNode(treeNode);
  }
  zTree.reAsyncChildNodes(treeNode, reloadType, true);
}
/**
 * 功能：当点击树节点时，调用该函数
 * @param event
 * @param treeId
 * @param treeNode
 * @return
 */
function zTreeOnClick(event, treeId, treeNode) {
    console.log("zTreeOnClickLog:--------------------------------")
    console.log(treeId);
    console.log(treeNode);
    console.log(treeNode.id);
    switch(treeNode.id+""){//根据树节点的Id判断
    case "1":
    case "11":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "12":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "13":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "2":
    case "21":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "22":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "23":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "24":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    case "3":
    case "31":
    	document.getElementById("iframepage").src="tree_click_page.jsp?treeNodeId="+treeNode.id;
    	break;
    }
}
$(document).ready(function(){
  $.fn.zTree.init($("#treeDemo"), setting, zNodes);//初始化zTree树
});

3.2后台
后台用的是Struts2框架，在struts.xml文件中设置好Action，根据前台节点的不同id号返回不同JSON格式的数据

/*
 * $filename: ZTreeDemoAction.java,v $
 * $Date: Sep 27, 2013  $
 * Copyright (C) ZhengHaibo, Inc. All rights reserved.
 * This software is Made by Zhenghaibo.
 */
package edu.njupt.zhb.ztree.action;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;


/*
 *@author: ZhengHaibo  
 *web:     http://blog.csdn.net/nuptboyzhb
 *mail:    [email protected]
 *Sep 27, 2013  Nanjing,njupt,China
 */
public class ZTreeDemoAction extends ActionSupport{
  /**
   * 
   */
  private static final long serialVersionUID = -3318989776253565435L;
    
  private int treeNodeId;//保存树节点的Id
  /**
   * 返回树的根节点的Json格式数据
   * @return
   */
  public String getNodesDataById(){
    System.out.println("treeNodeId = "+treeNodeId);
    String iconPath = ",icon:\"zTree/css/zTreeStyle/img/diy/3.png\"";
    String icon2Path = ",icon:\"zTree/css/zTreeStyle/img/diy/2.png\"";
    String icon9Path = ",icon:\"zTree/css/zTreeStyle/img/diy/9.png\"";
    String lookIconPath = ",icon:\"zTree/css/zTreeStyle/img/diy/8.png\"";
    String nodesJson = "";
    if (treeNodeId == 1) {
      nodesJson = "[{id:11, pId:"+treeNodeId+", name: \"综合检索\",isParent:false"+iconPath+"}," +
            "{id:12, pId:"+treeNodeId+", name: \"视频时间\",isParent:false"+iconPath+"}," +
            "{id:13, pId:"+treeNodeId+", name: \"视频地点\",isParent:false"+iconPath+"}" +
            "]";
    }else if(treeNodeId == 2) {
      nodesJson = "[{id:21, pId:"+treeNodeId+", name: \"生成索引\",isParent:false"+icon2Path+"}," +
            "{id:22, pId:"+treeNodeId+", name: \"上传图像\",isParent:false"+iconPath+"}," +
            "{id:23, pId:"+treeNodeId+", name: \"图像URL\",isParent:false"+iconPath+"}," +
            "{id:24, pId:"+treeNodeId+", name: \"查看索引\",isParent:false"+lookIconPath+"}" +
            "]";
    }else if (treeNodeId == 3) {
      nodesJson = "[{id:31, pId:"+treeNodeId+", name: \"语义检索\",isParent:false"+icon9Path+"}]";
    }else{
      nodesJson = "[]";//其他情况：父节点没有子节点
    }
    getPrintWriter().write(nodesJson);
    return SUCCESS;
  }
  
  /**
   * 获得HttpServletResponse对象
   * @return
   */
  public static HttpServletResponse getResponse() {
    HttpServletResponse response = ServletActionContext.getResponse();
    response.setContentType("text/html;charset=UTF-8");
    return response;
  }
  
  public PrintWriter getPrintWriter() {
    PrintWriter pw = null;
    try {
      pw = getResponse().getWriter();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return pw;
  }

  public int getTreeNodeId() {
    return treeNodeId;
  }

  public void setTreeNodeId(int treeNodeId) {
    this.treeNodeId = treeNodeId;
  }
}

4.页面效果

Jquery zTree演示程序Demo总结

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