Simple implementation code for jquery infinite drop-down menu_jquery

This example uses json data to splice ul and li to realize the
rendering:




1. Prepare json data:

Copy code The code is as follows:

var menuData = [
            {id:0,pid:-1,name:"订购产品",url:"",children:[
                {id:1,pid:0,name:"电脑配件",url:"http://www.jb51.net",children:[
                    {id:20,pid:1,name:"cpu",url:"http://www.jb51.net",children:[
                        {id:30,pid:20,name:"Intel",url:"http://www.jb51.net",children:[
                            {id:3000,pid:30,name:"Intel 01",url:""},
                            {id:3001,pid:30,name:"Intel 02",url:""},
                            {id:3002,pid:30,name:"Intel 03",url:""},
                            {id:3003,pid:30,name:"Intel 04",url:""},
                            {id:3004,pid:30,name:"Intel 05",url:""},
                            {id:3005,pid:30,name:"Intel 06",url:""},
                            {id:3006,pid:30,name:"Intel 07",url:""},
                            {id:3007,pid:30,name:"Intel 08",url:""},
                            {id:3008,pid:30,name:"Intel 09",url:""}
                        ]},
                        {id:31,pid:20,name:"AMD",url:"http://www.jb51.net",children:[
                            {id:3100,pid:31,name:"AMD 01",url:""},
                            {id:3101,pid:31,name:"AMD 02",url:""},
                            {id:3102,pid:31,name:"AMD 03",url:""},
                            {id:3103,pid:31,name:"AMD 04",url:""},
                            {id:3104,pid:31,name:"AMD 05",url:""},
                            {id:3105,pid:31,name:"AMD 06",url:""},
                            {id:3106,pid:31,name:"AMD 07",url:""},
                            {id:3107,pid:31,name:"AMD 08",url:""},
                            {id:3108,pid:31,name:"AMD 09",url:""}
                        ]}
                                      ), ,name:"hard drive",url:"http://www.jb51.net"},
                                                                                                                                          .net"},
{id:24,pid:1,name:"graphics card",url:"http://www.jb51.net"},
{id:25,pid:1, name:"monitor",url:"http://www.jb51.net"},
                                                                                                                                                                                                  . .net"},
{id:27,pid:1,name:"main chassis power supply",url:"http://www.jb51.net"},
{id:28,pid: 1,name:"Keyboard and mouse (wired)",url:"http://www.jb51.net"},
                                                                                                                                 :"http://www.jb51.net"}
                                                                                                                                                                                        ", children: [
{id: 102, pid: 101, name:" camera ", url:" http://www.jb51.net "},
{id: 103, pid: 101, name:"Camera",url:"http://www.jb51.net"},
                                                                                                                                                                                                      ; net"},
{id:112,pid:101,name:"Camera",url:"http://www.jb51.net"},
{id:113,pid:101,name :"Camera",url:"http://www.jb51.net"},
                                                                                                                                                     "},
{id:115,pid:101,name:"Camera",url:"http://www.jb51.net"},
"Camera",url:"http://www.jb51.net"},
                                                            {id:117, pid:101, name: "Camera", url: "http://www.jb51.net" }
                                                                                                                                             ,pid:201,name:"Camera",url:"http://www.jb51.net"}
                                                                                                                      ; 🎜>                                                                                                                                                                                                      :401,name:"Printer",url:"http://www.jb51.net"}. ",url:"http://www.jb51.net"},
                                                                                                                                            
                       {id:406, pid:401, name: "Camera", url: "http://www.jb51.net"},
                                                                                            ,url:"http://www.jb51.net"},
                                                                                                                                                                                                                                                    >                                                                                                                                                                                                                        ; ""}
                                                                                                                                                                                           ​:"Latest news",url:""},
                                                                                                                                                                                                                                                    🎜>
2.html code:




Copy code


The code is as follows:


< div id="menu">

3. Parse json data (plugin-menu.js file) : I just learned to write a jquery plug-in, and it’s a bit messy. Let’s make do with it

Copy the code

The code is as follows:

(function($){
    $.fn.extend({
        menu:function(options){
            var defaults = {
                data:[],
                ulId:"baseMenu"
            };
            var options = $.extend(defaults, options);
            // 开始拼接ul,li
            $.each(options.data,function(i,v){
                var li = $("

");
                var _a = $("" options.data[i].name "");
                _a.attr("href",options.data[i].url)
                    .appendTo(li);

                _each(options.data[i],li);
                li.appendTo($("#" options.ulId));
            });
            // 给li添加事件
            $(this).find("li").hover(function(){
                var id = $(this).attr("id");
                $(this).find("ul[name='" id "']").show();
            },function(){
                var id = $(this).attr("id");
                $(this).find("ul[name='" id "']").hide();
            });
        }
    });
})(jQuery);

因为支持无限级,所以肯定会用到递归方法:

复制代码 代码如下:

function _each(data,li){
    if(data==undefined||data.children==undefined){
        return false;
    }
    var ul = $("

");

    $.each(data.children,function(i,v){
        var _li = $("

");
        var _a = $("" data.children[i].name "");
        _a.attr("href",data.children[i].url)
            .attr("target","_blank")
            .appendTo(_li);

        if(data.children[i].children!=undefined){
            _each(data.children[i],_li);
        }
        _li.appendTo(ul);
    });
    ul.appendTo(li);
}

4.调用插件:

复制代码 代码如下:

$(function() {
    $("#menu").menu({data:menuData,ulId:"baseMenu"});
});

最后,css样式:

复制代码 代码如下:

ul,li{list-style:none;padding:0px;margin:0px;}
#menu *{line-height:30px;}
#menu a{text-decoration:none;}
#menu ul{text-align:left;}
#menu>ul>li{text-align:center;width:80px;float:left;}
#menu>ul>li>a{color:#000;}
#menu>ul>li:hover{background:#F0F0F0;}
#menu>ul>li ul{display:none;width:150px;position:absolute;background:#c1cd94;box-shadow:2px 2px 2px #000;-webkit-box-shadow:2px 2px 2px #000;
　　-moz-box-shadow:2px 2px 2px #123;}
#menu>ul>li>ul li{padding-left:5px; position:relative;}
#menu>ul>li>ul li>a{color:#000;}
#menu>ul>li>ul li:hover{background:#d3dbb3;}
#menu>ul>li>ul>li ul{left:150px; top:0px;}