本文實例講述了json+jQuery實現的無限級樹形菜單效果代碼。分享給大家供大家參考。具體如下：
這里演示json樹形菜單，JS無級樹樹形菜單，引入了jQuery插件，使用遞歸實現獲取無級樹數據并生成DOM結構，可以在JSON數據里 擴展無限級 看結構就明白。
先來看看運行效果截圖：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/jquery-json-tree-style-menu-codes/
具體代碼如下：
<!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無級樹樹形菜單</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="全部展開" /> <input name="" type="button" id="btn_close" value="全部收縮" /></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"} ]/*遞歸實現獲取無級樹數據并生成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]["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); $(this).html("[+] " + spanContent); } } })}()/*展開*/$("#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>希望本文所述對大家的jquery程序設計有所幫助。
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