JS 实现点击展开菜单

时间：2021-05-09 22:45:20

1： 获取事件源的两种方式

2： overflow 控制展现

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

	 <script type="text/javascript">

  		 // 第二种通过this对象获取时间源

  		function list(node){

  			//alert(""");

  			var dlNode = node.parentNode;

  			var nodes = document.getElementsByTagName("dl");

  			//alert(nodes.length);

  			for (var i = 0; i < nodes.length; ++i) {

  				if (nodes[i] == dlNode) {

  					if (nodes[i].className == "close") {

  						nodes[i].className = "open";

  					} else {

  						nodes[i].className = "close";

  					}

  				} else {

  					nodes[i].className = "close";

  				}

  			}

  		}

  		/* 第一种通过event获取时间源

  		function list(){

  			var node = event.srcElement;

  			var dlNode = node.parentNode;

  			var nodes = document.getElementsByTagName("dl");

  			//alert(nodes.length);

  			for (var i = 0; i < nodes.length; ++i) {

  				if (nodes[i] == dlNode) {

  					if (nodes[i].className == "close") {

  						nodes[i].className = "open";

  					} else {

  						nodes[i].className = "close";

  					}

  				} else {

  					nodes[i].className = "close";

  				}

  			}

  		} */

  	 </script>

  	 <style type="text/css">

  	 	.open{

  	 		overflow: visible;

  	 	}

  	 	.close{

  	 		overflow: hidden;

  	 	}

  	 	dl{

  	 		overflow: hidden;

  	 		height: 16px;

  	 	}

  	 </style>

  </head>

  <body>

    <dl>

    	<dt onclick="list(this)">会员管理</dt>

	    	<dd>添加会员</dd>

	    	<dd>删除会员</dd>

	    	<dd>查询会员</dd>

    </dl>

 	<dl>

    	<dt onclick="list(this)">会员管理</dt>

	    	<dd>添加会员</dd>

	    	<dd>删除会员</dd>

	    	<dd>查询会员</dd>

    </dl>

    <dl>

    	<dt onclick="list(this)">会员管理</dt>

	    	<dd>添加会员</dd>

	    	<dd>删除会员</dd>

	    	<dd>查询会员</dd>

    </dl>

    <dl>

    	<dt onclick="list(this)">会员管理</dt>

	    	<dd>添加会员</dd>

	    	<dd>删除会员</dd>

	    	<dd>查询会员</dd>

    </dl>

    <dl>

    	<dt onclick="list(this)">会员管理</dt>

	    	<dd>添加会员</dd>

	    	<dd>删除会员</dd>

	    	<dd>查询会员</dd>

    </dl>

  </body>

</html>

　　

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