Question

ztree提取json部分数据取值为undefined

楼主让ztree提取json数据的时候 isParent取值一直为undefined，请问是什么原因?下面两张图分别是JSON格式和提取数据时的情况

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Answer 1

在URL后面？传输数据是get的方式，不是POST，所以你需要把TYPE设置成GET,然后用doGet方法来接收，试试看呗O(∩_∩)O

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我就是get方式

Answer 2

问了一些人 他们说 让我 先设置值 然后在取值， 通过request.setAttribute("jsonArray",jsonArray)可是我写代码是在java类中写的啊 java类中没有这个(request)对象啊， 我到底该咋办? 你的java要写成servlet啊，做成web项目，页面才可以访问啊，...

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老哥 我这就是Web项目 用的SSM框架

Answer 3

你怎么提取的？

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追答

错了

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怎么改呢

追答

最好能远程看下

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给个企饿吧

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看头像

Answer 4

java小白初用ztree：
ztree的官网上demo已经很详细，最近项目有用到树桩结构，自己就选择了ztree,下面从后台取数据生成树状结构的源码，官网上用到的php.
1.项目jar包：

2.实体类ZtreeNode.java，生成demo中的zNodes:

示例代码：
package com.demo.ztree.entity;
public class ZtreeNode {
private String id;
private Integer state;
private String pid;
private String icon;
private String iconClose;
private String iconOpen;
private String name;
private boolean open;
private boolean isParent;
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("{id:\"");
sb.append(id);
sb.append("\",pId:\"");
sb.append(pid);
sb.append("\",name:\"");
sb.append(name);
sb.append("\",state:");
sb.append(state);
sb.append(",icon:\"");
sb.append(icon);
sb.append("\",iconClose:\"");
sb.append(iconClose);
sb.append("\",iconOpen:\"");
sb.append(iconOpen);
sb.append("\",open:\"");
sb.append(open);
sb.append("\",isParent:\"");
sb.append(isParent);
sb.append("\"}");
return sb.toString();
}
public String getIcon() {
return icon;
}
public void setIcon(String icon) {
this.icon = icon;
}
public String getIconClose() {
return iconClose;
}
public void setIconClose(String iconClose) {
this.iconClose = iconClose;
}
public String getIconOpen() {
return iconOpen;
}
public void setIconOpen(String iconOpen) {
this.iconOpen = iconOpen;
}
public boolean isOpen() {
return open;
}
public void setOpen(boolean open) {
this.open = open;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPid() {
return pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isIsParent() {
return isParent;
}
public void setIsParent(boolean isParent) {
this.isParent = isParent;
}
public Integer getState() {
return state;
}
public void setState(Integer state) {
this.state = state;
}
public static void main(String[] args) {
ZtreeNode ztree1 = new ZtreeNode();
ztree1.setId("1");
ztree1.setPid("0");
ztree1.setName("顶层节点");
System.out.println(ztree1);
}
}
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其中，id、pid、isparent必须，其他的根据需求添加
3.在action中给ZtreeNode属性取值，根据业务，在数据库中取相应值，这里我就直接生成一些值：
这里根据取值过程，分为2中方式：
(1).一次性取值，传到页面：
示例代码：
public String showTree() {
for(int i=-1;i<100000;i++){
if(i<0){
ZtreeNode ztree = new ZtreeNode();
ztree.setId("0");
ztree.setName("顶层节点 ");
ztree.setIsParent(true);
ztree.setIcon(icon);
ztree.setIconClose(iconClose);
ztree.setIconOpen(iconOpen);
listTree.add(ztree);
}else{
ZtreeNode ztree = new ZtreeNode();
ztree.setId(""+(i+1));
ztree.setName("级节点");
ztree.setPid(""+i/10);
ztree.setIcon(icon);
ztree.setIconClose(iconClose);
ztree.setIconOpen(iconOpen);
listTree.add(ztree);
}
}
return SUCCESS;
}
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(2).异步取值返回页面：
示例代码：
public String getTree() {
return SUCCESS;
}
public String asyncTree() {
String pid = getRequest().getParameter("id");
if(pid==null ||pid.equals("")){
pid="0";
ZtreeNode ztree = new ZtreeNode();
ztree.setId("1");
ztree.setName("顶级节点");
ztree.setIsParent(true);
ztree.setState(1);
ztree.setIcon(icon);
ztree.setIconClose(iconClose);
ztree.setIconOpen(iconOpen);
listTree.add(ztree);
}else{
for(int i=0;i<40;i++){
ZtreeNode ztree = new ZtreeNode();
ztree.setId(pid+i);
ztree.setName(""+pid.length()+"级节点");
ztree.setState(1);
ztree.setIcon(icon);
ztree.setIconClose(iconClose);
ztree.setIconOpen(iconOpen);
if(pid.length()<4){
ztree.setIsParent(true);
}
listTree.add(ztree);
}
}
json = JSONArray.fromObject(listTree);
return SUCCESS;
}
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4.页面
(1).一次性取值，传到页面：
示例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>ztree</title>
<link href="${request.contextPath}/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="${request.contextPath}/js/jquery-1.8.3.js"></script>
<script type="text/javascript" src="${request.contextPath}/js/jquery.ztree.all-3.5.min.js"></script>
<script type=text/javascript>
var zNodes = ${listTree};
var setting = {
check: {
enable: true,
chkboxType: {"Y":"s", "N":"ps"}
},
data: {
simpleData: {
enable: true
}
}
};
$(document).ready(function(){
$.fn.zTree.init($("#treeDemo"), setting, zNodes);
});
</script>
</head>
<body>
<div class="zTreeDemoBackground left">
<ul id="treeDemo" class="ztree"></ul>
</div>
<body >
</html>
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(2).异步取值返回页面：
示例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>ztree</title>
<link href="${request.contextPath}/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="${request.contextPath}/js/jquery-1.8.3.js"></script>
<script type="text/javascript" src="${request.contextPath}/js/jquery.ztree.all-3.5.min.js"></script>
<script type=text/javascript>
var setting = {
view: {
showLine: false,
addDiyDom: addDiyDom
},
async: {
enable: true,
autoParam: ["id"],
url: "${request.contextPath}/asyncTree.action",
dataFilter: filter
},
check: {
enable: true,
chkboxType: {"Y":"s", "N":"ps"}
},
callback: {
onAsyncSuccess: zTreeOnAsyncSuccess
},
data: {
simpleData: {
enable: true
}
}
};
$(document).ready(function(){
$.fn.zTree.init($("#treeDemo"), setting);
});
var zTree = $.fn.zTree.getZTreeObj("treeDemo");
function zTreeOnAsyncSuccess(event, treeId, treeNode, msg) {
if(treeNode==null){
var zTree = $.fn.zTree.getZTreeObj("treeDemo");
nodes = zTree.getNodes();
for (var i=0, l=nodes.length; i<l; i++) {
zTree.expandNode(nodes[i], true, false, false);
}
asyncNodes(zTree.getNodes());
if (!goAsync) {
curStatus = "";
}
}
};
function asyncNodes(nodes) {
if (!nodes) return;
curStatus = "async";
var zTree = $.fn.zTree.getZTreeObj("treeDemo");
for (var i=0, l=nodes.length; i<l; i++) {
if (nodes[i].isParent && nodes[i].zAsync) {
asyncNodes(nodes[i].children);
} else {
goAsync = true;
zTree.reAsyncChildNodes(nodes[i], "refresh", true);
}
}
}
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;
}
function addDiyDom(treeId, treeNode) {
var aObj = $("#" + treeNode.tId + "_a");
if ($("#diyBtn_"+treeNode.id).length>0) return;
switch (treeNode.state) {
case 0:
var editStr = "<span id='diyBtn_space_" +treeNode.id+ "' style='color:red;padding-left:5px;'>未审核</span>";
break;
case 1:
var editStr = "<span id='diyBtn_space_" +treeNode.id+ "' style='color:#6495ED;padding-left:5px;'>正常</span>";
break;
case 2:
var editStr = "<span id='diyBtn_space_" +treeNode.id+ "' style='color:#CD2626;padding-left:5px;'>锁定</span>";
break;
default:
var editStr = "<span id='diyBtn_space_" +treeNode.id+ "' style='padding-left:5px;'>未知状态</span>";
break;
}
aObj.append(editStr);
}
</script>
</head>
<body>
<div class="zTreeDemoBackground left">
<ul id="treeDemo" class="ztree"></ul>
</div>
<body >
</html>
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5.struts.xml配置：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="default-package" extends="json-default">
<result-types>
<result-type name="json" class="org.apache.struts2.json.JSONResult"/>
</result-types>
<interceptors>
<interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
</interceptors>
</package>
<package name="default" namespace="/" extends="default-package">
<action name="showTree" class="com.demo.ztree.action.HelloAction"
method="showTree">
<result name="success" type="freemarker">/hello.ftl</result>
</action>
<action name="getTree" class="com.demo.ztree.action.HelloAction"
method="getTree">
<result name="success" type="freemarker">asyncZtree.ftl</result>
</action>
<action name="asyncTree" class="com.demo.ztree.action.HelloAction"
method="asyncTree">
<result name="success" type="json">
<param name="root">json</param>
</result>
</action>
</package>
</struts>
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6.效果图：

7.可以根据自己的业务要求自己选用和改进，这里包含了：
(1)checked框的提交;
(2)异步加载，显示1级节点后，后台自动加载下级节点。
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