JavaScript处理数据完成左侧二级菜单的搭建

function MenuTree(id,url){
    this.id = id;
    this.url = url;
    this.$Div = null;
    this.$curA = null;
    this.initTree();    
}

MenuTree.prototype.initTree = function(){
    var self = this; 
    //左侧菜单的容器，根据元素的id来定义
    this.$Div = $("#"+this.id);
    if(this.$Div.length == 0){
        alert("菜单初始化外容器失败");
        return;
    }
    //点击方法的代理,点击这个容器时会使用this.treeClick定义的方法来代理
    this.$Div.click($.proxy(this.treeClick,this));
    //向设置好的菜单地址发送请求
    $.post(this.url,function(data){
        self.createTreeMenu(data.list);
    },"json")    
}
MenuTree.prototype.createTreeMenu = function(list){
    //若没有读取到数据，或者数据长度为0，容器会显示暂无菜单
    if(!list||list.length == 0){
        this.$Div.html("暂无菜单");
        return;
    }
    //声明一个空对象，用来存放创建的菜单信息
    var rootNodes = {};
    var len = list.length;
    var node = null;
    var curNodeId="";
    for(var i=0;i<len;i++){
        node = list[i];
        //当读取到的菜单status为1时,代表菜单不可用,跳过
        if(node.status=='1') continue;
        var id = node.id;
        var name = node.name;
        var url = node.url;
        var pid = node.pid;
        //当本条数据pid为0时，创建这条数据为父菜单
        if(pid == "0"){
            rootNodes[id] = $("<div class='leftTreeMenu hasChildren'><leftMenuTitle>"+name+"</leftMenuTitle></div>");
            continue;
        }
        //子菜单的pid是父菜单的id，所以这里的rootNodes[pid]就是上面的rootNodes[id]
        var $pnode = rootNodes[pid];
        //子菜单创建后要把id和url作为自定义属性添加到元素上面，后面会用到
        var $a = $("<leftTreeNode id='leftTreeLink_"+id+"'>"+name+"</leftTreeNode>").attr("id",id).attr("url",url);
        $pnode.append($a);
        //这里略过不提，下一篇文章讲
        if(fromURI && (url==fromURI)){
            this.$curA = $a.addClass("currentA");
            $pnode.addClass("currentMenu").removeClass("hideChildren");
            myBar.freshTag(id,name,url);
        }
    }
    var df = document.createDocumentFragment();
    for(key in rootNodes){
        //appendChild是原生js的用法
        //[0]的目的是将jq的对象转换成dom对象
        df.appendChild(rootNodes[key][0]);
    }
    (this.$Div)[0].appendChild(df);
}

MenuTree.prototype.treeClick = function(e){
    //click事件，会用到dom和jq的转换
    var target = e.target;
    var nodeName = target.nodeName;
    //如果点击的是父菜单，就通过切换class名字来展示和隐藏子菜单
    if(nodeName == "LEFTMENUTITLE"){
        $(target).parent().switchClass("hideChildren");
        return;
    }
    //如果点击的是子菜单，就处理子菜单的数据    
    if(nodeName == "LEFTTREENODE"){
        this.freshTag($(target));
    }
}

MenuTree.prototype.changeCurNode = function($e){
    //如果点击的与选中的是同一个，就return
    if(this.$curA == $e) return;
    //如果this.$curA存在，就将以前的类名currentA移除并子菜单隐藏
    if(this.$curA){
        this.$curA.removeClass("currentA").parent().removeClass("currentMenu");
    }
    //刚刚点击的添加类名currentA并显示子菜单
    this.$curA = $e.addClass("currentA");
    $e.parent().addClass("currentMenu").removeClass("hideChildren");
}

MenuTree.prototype.freshTag = function($e){
    //处理点击的元素
    this.changeCurNode($e);
    //将绑定在元素上的url取出
    var url = $e.attr("url");
    if(url.indexOf("http")==0 ){
        window.open(url);
        return;    
    }
    //这个会在下一篇文章再讲,这里是创建右侧mybar和url页面的显示信息
    myBar.freshTag($e.attr("id"),$e.html(),url);
}　

var leftTree = new MenuTree("leftTree","<c:url value='/menu/getMenuTree'/>");

package cn.wangze.controller;

import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes;

import cn.wangze.service.SysCacheService;
import cn.wangze.service.SysMenuService;

import cn.wangze.domain.SysMenu;
//import cn.wangze.service.SysMenuService;
//import cn.wangze.utils.AuthUtils;

@Controller
@RequestMapping("/menu")
@SessionAttributes("sysUser") 
public class SysMenuController01 extends BaseController{
    Log log = LogFactory.getLog(getClass());
    
    //将菜单的service注入控制器里面
    @Resource
    private SysMenuService<SysMenu> sysMenuService;
    //若菜单固定的话，我们可以将数据放到缓存中，这样不用每次都从数据库请求
    @Autowired
    private SysCacheService sysCacheService;
    
    @RequestMapping(value = "/{pagePath}/{pageName}")
    public String goMenuPage(@PathVariable String pagePath, @PathVariable String pageName,HttpServletRequest request) {
        setFromURI(request);
        return "/" + pagePath + "/" + pageName;
    }
    
    @RequestMapping(value = "/getMenuTree")
    public void getMenu(HttpServletResponse response,HttpSession session) {
        //调用sysCacheService的queryMenuList方法来取数据
        List<SysMenu> list = sysCacheService.queryMenuList();
        log.debug("总菜单：" + list);
        if (list == null) return;
        //可参照我前面发的博客文章，封装的返回数据的方法，在BaseController里面
        sendJsonList(list, response);
    }
}