本文实例讲述了json+jQuery实现的无限级树形菜单效果代码。分享给大家供大家参考。具体如下：
这里演示json树形菜单，JS无级树树形菜单，引入了jQuery插件，使用递归实现获取无级树数据并生成DOM结构，可以在JSON数据里 扩展无限级 看结构就明白。
先来看看运行效果截图：
在线演示地址如下：
http://demo.jb51.net/js/2015/jquery-json-tree-style-menu-codes/
具体代码如下：
<!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 type="text/javascript" src="jquery-1.6.2.min.js"></script>
<title>JS无级树树形菜单</title>
<style type="text/css">
.menuTree{ margin-left:-30px;}
.menuTree div{ padding-left:30px;}
.menuTree div ul{ overflow:hidden; display:none; height:auto;}
.menuTree span{ display:block; height:25px; 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;}
.btn{ height:30px; margin-top:10px; border-bottom:1px solid #CCC;}
</style>
</head>
<body>
<div class="btn">
<input name="" type="button" id="btn_open" value="全部展开" />
<input name="" type="button" id="btn_close" value="全部收缩" />
</div>
<div id="menuTree" class="menuTree"></div>
</body>
</html>
<script type="text/javascript">
var json = [{"name":"*a","list":[
{"name":"**a","url":"#a1"},
{"name":"**aa","list":[
{"name":"***a","url":"#a11"}, {"name":"***aa","list":[ {"name":"****a","url":"#a111"}, {"name":"****aa","list":[ {"name":"*****a","url":"#a1111"}, {"name":"*****aa","url":"#a1112"}
]}
]},
{"name":"***aaa","url":"#a13"},
{"name":"***aaaa","url":"#a14"}
]
},
{"name":"**a","url":"#a3"}
]
},
{"name":"*b","list":[
{"name":"**b","url":"#b1"},
{"name":"**bb","list":[
{"name":"****b","url":"#b111"},
{"name":"****bb","url":"#b112"}
]
},
]
},
{"name":"*c","list":[
{"name":"**c","url":"#c1"},
{"name":"**cc","url":"#c2"}
]
},
{"name":"*d"}
]
/*递归实现获取无级树数据并生成DOM结构*/
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]["name"] +"</span><ul>";
}else{
urlstr = "<div><span><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;
}
/*添加无级树*/
document.getElementById("menuTree").innerHTML = forTree(json);
/*树形菜单*/
var menuTree = function(){
//给有子对象的元素加[+-]
$("#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);
}
}
})
}()
/*展开*/
$("#btn_open").click(function(){
$("#menuTree ul").show(300);
curzt("-");
})
/*收缩*/
$("#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>希望本文所述对大家的jquery程序设计有所帮助。
