JS three-level collapsible menu implementation method_javascript skills-JS Tutorial-php.cn

JS three-level collapsible menu implementation method_javascript skills

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Release： 2016-05-16 15:13:17

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The example in this article describes the implementation method of JS three-level collapsible menu. Share it with everyone for your reference, the details are as follows:

.ASPX code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NavigateMenu.aspx.cs" Inherits="NavigateMenu" %>
<!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 runat="server">
  <title>无标题页</title>
  <script type="text/javascript" src="JScript.js" ></script>
  <style type="text/css">
*{
 margin: 0px;
 padding: 0px;
 border:0px;
}
#nav{
 width: 600px;
 margin: 0px;
 padding: 0px;
 font-size: 14px;
 line-height: 30px;
}
#nav li{
 width: 180px;
 padding-left: 20px;
 padding-bottom: 1px;
 list-style-image: none;
 list-style-type: none;
 background-color: #FFFFFF;
}
#nav a{
 padding-left: 20px;
 background-color: #BFBFBF;
 display: block;
 text-decoration: none;
}
#nav a:hover {
 background-color: #FF9175;
}
#nav li ul{
 padding-top: 1px;
 list-style-image: none;
 list-style-type: none;
}
#nav li li{
 padding-left: 0px;
}
#nav ul a{
 background-color: #EBEBEB;
}
.cx {
 display:none;
 visibility:hidden;
}
.ex {
 display:inherit;
 visibility:inherit;
}
</style>
<script type="text/javascript" >
 window.onload=function(){
 statUp();
 }
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="Parent">
<ul id="nav">
<li><a href="javascript:void(0);" onclick="doMenu(this,'1')">菜单1</a>
 <ul>
 <li><a href="javascript:void(0);">菜单1_1</a></li>
 <li><a href="javascript:void(0);">菜单1_2</a></li>
 </ul>
</li>
<li><a href="javascript:void(0);" onclick="doMenu(this,'1')">菜单2</a>
 <ul>
 <li><a href="javascript:void(0);" onclick="doMenu(this,'2')" >菜单2_1</a>
 <ul>
 <li>菜单2_1_1</li>
 <li>菜单2_1_2</li>
 </ul>
 </li>
 <li><a href="javascript:void(0);" onclick="doMenu(this,'2')">菜单2_2</a>
  <ul>
 <li>菜单2_2_1</li>
 </ul>
 </li>
 </ul>
</li>
</ul>
</div>
</form>
</body>
</html>

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js file code:

function doMenu(obj,strDeep){
 var items=obj.parentNode.getElementsByTagName("ul");
 //获取a 对象你节点li 下包含的 所有ul集合
 var itmUl;
 var deeps=strDeep; //strDeep 为当前菜单的级数
 if(items.length>0){
 itmUl=items[0];
 alert(itmUl);
 }
 if(itmUl.className!="ex"){
 cxAll();//当前节点为关闭状态时,先执行关闭所有ul子菜单
 if(deeps=='2'){ //若要展开三级菜单当,还要将其二级父菜单展开
 itmUl.parentNode.parentNode.className="ex";
 }
 itmUl.className="ex"; //展开下级菜单
 }else{
 itmUl.className="cx";
 }
}
function statUp(){
 cxAll();
 var ulDom=document.getElementById("nav");
 var items=ulDom.getElementsByTagName("ul");
}
function cxAll(){
 var ulDom=document.getElementById("nav");
 var items=ulDom.getElementsByTagName("ul");
 for (var i=0;i<items.length;i++)
 {
 items[i].className="cx";
 }
}

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Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging techniques", "Summary of JavaScript data structures and algorithm techniques", "Summary of JavaScript traversal algorithms and techniques" and "JavaScript Mathematics Summary of operation usage》

I hope this article will be helpful to everyone in JavaScript programming.