treeGrid树形数据表格的json数据格式说明

在使用easyUI 的treeGrid的时候，很多时候我们从数据库取出来的数据treeGrid却不能读取显示成一个树：如下

{
menuCode: "a00",
menuName: "管理员首页",
menuUrl: "/main/admin/index.action",
menuPCode: "-1",
isLeaf: "0",
status: "1",
icon: null,
createUser: "system",
createDate: "2014-01-24 17:10:25",
modifyUser: "system",
modifyDate: "2014-01-24 17:10:25"
},
{
menuCode: "a0001",
menuName: "修改密码",
menuUrl: "/main/admin/modifyPwd.action",
menuPCode: "a00",
isLeaf: "1",
status: "1",
icon: null,
createUser: "system",
createDate: "2014-01-24 17:10:25",
modifyUser: "system",
modifyDate: "2014-01-24 17:10:25"
},
{
menuCode: "a0002",
menuName: "图片上传",
menuUrl: "/image/admin/uploadImage.action",
menuPCode: "a00",
isLeaf: "1",
status: "1",
icon: null,
createUser: "system",
createDate: "2014-01-24 17:10:25",
modifyUser: "system",
modifyDate: "2014-01-24 17:10:25"
}

例如以上是我从数据库表中取的值并转化为json格式，逻辑上我是靠menuCode和menuPcode来表示父子的继承关系，但是easyUI的treeGrid不买账，她可不会理解你的父子关系是通过menuCode和menuPcode表现的

于是乎有人觉得json格式应该如下：

通过设置children来方便treeGrid解析，于是乎有人开始对取出来的表数据进行遍历啊，拼接字符串啦之类的操作，往这个格式上拼凑，其实完全没必要

解决办法：

使用谷歌浏览器打开如下链接

http://www.jeasyui.net/demo/581.html

F12查看该例子树形数据表格的数据格式：

数据格式为：

{"total":9,"rows":[
    {"id":1,"region":"Wyoming"},
    {"id":11,"region":"Albin","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":1},
    {"id":12,"region":"Canon","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":1},
    {"id":13,"region":"Egbert","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":1},
    {"id":2,"region":"Washington"},
    {"id":21,"region":"Bellingham","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":2},
    {"id":22,"region":"Chehalis","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":2},
    {"id":23,"region":"Ellensburg","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":2},
    {"id":24,"region":"Monroe","f1":2000,"f2":1800,"f3":1903,"f4":2183,"f5":2133,"f6":1923,"f7":2018,"f8":1838,"_parentId":2}
],"footer":[
    {"region":"Total","f1":14000,"f2":12600,"f3":13321,"f4":15281,"f5":14931,"f6":13461,"f7":14126,"f8":12866}
]}

属性表格加载正确的前提是json数据中要正确初始化_parentId节点。