js通過數據動態渲染無級樹形菜單

最近在做一個項目，需要利用從后台傳過來的數據渲染一個樹形菜單：主要是利用遞歸算法一級一級向下渲染的。然后我通過查找案例，資料完成了這個功能，但還是想把它寫出來。以方便以后用得着。

 

先看數據結構（自己模擬的一個菜單欄jJSON）：

　　　

var json = {
                "success": true,
                "code": "200",
                "data": [{
                    "name": "1",
                    "icon": "icon-yuyue",
                    "userLevel": "我的預約",
                    "list": [{
                        "name": "2",
                        "url": "../MyReservation/index.html",
                        "userLevel": "預約成功"
                    },{
                        "name": "2",
                        "url": "../LookHouse/index.html",
                        "userLevel": "已看完房"
                    }]
                },
                    {
                        "name": "2",
                        "icon": "icon-wujiaoxing",
                        "userLevel": "我的收藏",
                        "list": [{
                            "name": "2",
                            "url": "../CollectShops/index.html",
                            "userLevel": "收藏店鋪",
                            // "list": [{
                            //     "name": "3",
                            //     "userLevel": "c三級"
                            // }]
                        },{
                            "name": "2",
                            "url": "../CollectHouse/index.html",
                            "userLevel": "收藏房源"
                        }]
                    },{
                        "name": "1",
                        "icon": "icon-zuji-copy",
                        "url":"../MyFootprint/index.html",
                        "userLevel": "我的足跡"
                    },{
                        "name": "1",
                        "icon": "icon-zufangyuechifangzimianxing",
                        "url": "../MyRent/index.html",
                        "userLevel": "我的租房"
                    }, {
                        "name": "1",
                        "icon": "icon-zhangdan",
                        "url": "../MyBill/index.html",
                        "userLevel": "我的賬單"
                    }, {
                        "name": "1",
                        "icon": "icon-baoxiu",
                        "userLevel": "房屋報修",
                        "list": [{
                            "name": "2",
                            "url": "#",
                            "userLevel": "我的報修"
                        },{
                            "name": "2",
                            "url": "#",
                            "userLevel": "增加服務"
                        }]
                    },{
                        "name": "1",
                        "icon": "icon-comment",
                        "url": "#",
                        "userLevel": "我的評論"
                    },{
                        "name": "1",
                        "icon": "icon-qianbao",
                        "userLevel": "獎勵錢包",
                        "list": [{
                            "name": "2",
                            "url": "#",
                            "userLevel": "我的余額"
                        },{
                            "name": "2",
                            "url": "#",
                            "userLevel": "交易流水"
                        }]
                    }
                ]
            };

　　很簡單：就一個data數組，然后分為幾個對象，每個對象里面也可能會有數組 （比如：list），則為二級菜單。 list里面也可能會有個數組，則為三級菜單。這便是一個層層遞歸下去的菜單欄

　　

　　js代碼 （用JQ寫的，但是改成原生js也很方便）；

　　

　<div class="navigation" id="navigation"></div>

var str = " ";  

/*遞歸實現獲取無級樹數據並生成DOM結構*/

var forTree = function (data) {
   for(var i=0; i<data.length; i++) {
        var urlstr = "";
        try {
              
             if(typeof  data[i]["url"] === undefined) { 
                 urlstr = "<div class='box'><i class='iconfont "+ o[i]['icon'] +"' ></i><span>"+o[i]["userLevel"]+"</span><ul>";
             }else {
                  urlstr = "<div class='box'><i class='iconfont "+ o[i]['icon'] +"' ></i><span><a target='myFrameName' href="+ o[i]["url"] +">"+ o[i]["userLevel"] +"</a></span><ul>";
             }
              str+= urlstr;
              if(data[i]["list"] != null) { 
                  forTree(data[i]["list"]);
              }  
              str += "</ul></div>"
        }catch(e) {}         
    }      
      return str;  
};      

$("#navigation").html( forTree(json.data));

var menuTree = function(){
                //給有子對象的元素加
                $("#navigation ul").each(function(index, element) {
                    var ulContent = $(element).html();
                    var spanContent = $(element).siblings("span").html();
                    if(ulContent){
                        $(element).siblings("span").html(spanContent + "<i id='one' class='iconfont icon-xiangshangjiantou-copy-copy-copy'></i>")
                    }
                });

                $("#left_navbar").find("div span").click(function(){
                    var ul = $(this).siblings("ul");
                    var spanStr = $(this).html();
                    var spanContent = spanStr.substr(0,4);
                    console.log(spanContent);
                    if(ul.find("div").html() != null){
                        if(ul.css("display") == "none"){
                            ul.show(300);
                            $(this).html(spanContent + "<i id='one' class='jiantou iconfont icon-xiangshangjiantou'></i>");
                        }else{
                            ul.hide(300);
                            $(this).html(spanContent + "<i id='one' class='jiantou iconfont icon-xiangshangjiantou-copy-copy-copy'></i>");
                        }
                    }
                })
            }();



                  

 

這樣一個不錯的樹形菜單就完成了。 

效果圖： 

　　

　　　　

附上一個完整代碼（可以在里面更改代碼修改不同的需求）

<!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" />
<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<title>JS無級樹樹形菜單</title>
<style type="text/css">
.menuTree{ margin-left:0px;}
.menuTree div{ padding-left:1px;}
.menuTree div ul{ overflow:hidden; display:none; height:auto; margin:0;}
.menuTree span{ display:block; height:20px; line-height:25px; padding-left:5px; margin:1px 0; cursor:pointer; border-bottom:1px solid #CCC;}
.menuTree span:hover{ background-color:#e6e6e6; color:#cf0404;}
.menuTree a{ color:#333; text-decoration:none;}
.menuTree a:hover{ color:#06F;}
.menuTree span{height: 50px;}
</style>
</head>
<body>

<div id="menuTree" class="menuTree"></div>
</body>
</html>
<script type="text/javascript">
var json = [
    {
        "name": "1",
        "userLevel":"+ 一級",
        "list": [
            {
                //顯示名稱
                "name": "2",
                //跳轉名稱
                "url" :"url_herf",
                //用戶等級
                "userLevel":"+ 二級",
                //下級
                "list": [
                    {
                        "name": "3",
                        "userLevel":"三級"
                    }
                ]
            }
        ]
    },
    {
        "name": "1",
        "userLevel":"+ a一級",
        "list": [
            {
                //顯示名稱
                "name": "2",
                //跳轉名稱
                "url" :"url_herf",
                //用戶等級
                "userLevel":"+ b二級",
                //下級
                "list": [
                    {
                        "name": "3",
                        "userLevel":"c三級"
                    }
                ]
            }
        ]
    }
]
/*遞歸實現獲取無級樹數據並生成DOM結構*/
    var str = "";
    var forTree = function(o){
         for(var i=0;i<o.length;i++){
                var urlstr = "";
             try{
                     if(typeof o[i]["url"] == "undefined"){
                              urlstr = "<div><span>"+o[i]["userLevel"]+ o[i]["name"] +"</span><ul>";
                     }else{
                         urlstr = "<div><span>"+o[i]["userLevel"]+"<a href="+ o[i]["url"] +">"+ o[i]["name"] +"</a></span><ul>"; 
                     }
                 str += urlstr;
                 if(o[i]["list"] != null){
                     forTree(o[i]["list"]);
                 }
                str += "</ul></div>";
             }catch(e){}
     }
     return str;
    }
    /*添加無級樹*/
    document.getElementById("menuTree").innerHTML = forTree(json);

    /*樹形菜單*/
    var menuTree = function(){
     //給有子對象的元素加
         $("#menuTree ul").each(function(index, element) {
             var ulContent = $(element).html();
             var spanContent = $(element).siblings("span").html();
             if(ulContent){
                 $(element).siblings("span").html(spanContent) 
             }
         });

         $("#menuTree").find("div span").click(function(){
              var ul = $(this).siblings("ul");
             var spanStr = $(this).html();
              var spanContent = spanStr.substr(3,spanStr.length);
             if(ul.find("div").html() != null){
                 if(ul.css("display") == "none"){
                     ul.show(300);
                      // $(this).html("[-]" + spanContent);
                  }else{
                     ul.hide(300);
                     // $(this).html("[+] " + spanContent);
                  }
             }
         })
    }()

    /*樹形列表展開*/
    $("#btn_open").click(function(){
        $("#menuTree ul").show(300);
         curzt("-");
    })

    /*收縮*/
    $("#btn_close").click(function(){
         $("#menuTree ul").hide(300);
         curzt("+");
    })
    function curzt(v){
     $("#menuTree span").each(function(index, element) {
         var ul = $(this).siblings("ul");
         var spanStr = $(this).html();
         var spanContent = spanStr.substr(3,spanStr.length);
         if(ul.find("div").html() != null){
             $(this).html("["+ v +"] " + spanContent);
          }
     }); 
    }
</script>