本文介绍了一种符合WEB标准的竖型下拉菜单实现方案，通过HTML和CSS结合JavaScript来创建具有多级子菜单的导航栏。文章详细展示了如何设置菜单项样式、使用JavaScript控制子菜单显示隐藏等。
符合WEB标准的竖型下拉菜单
<html>
<head>
<title>Horizontal Drop Down Menus</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<style type="text/css">
body { font: normal 12px verdana; }
ul {
margin: 0;
padding: 0;
list-style: none;
width: 130px; /* Width of Menu Items */
border-bottom: 1px solid #ccc;
}
ul li { position: relative; }
li ul {
position: absolute;
left: 129px; /* Set 1px less than menu width */
top: 0;
display: none;
}
/* Styles for Menu Items */
ul li a {
display: block;
text-decoration: none;
color: #666;
background: #fff; /* IE6 Bug */
padding: 5px;
border: 1px solid #ccc;
border-bottom: 0;
}
/* Fix IE. Hide from IE Mac */
* html ul li { float: left; height: 1%; }
* html ul li a { height: 1%; }
/* End */
ul li a:hover { color: #E2144A; background: #f9f9f9; } /* Hover Styles */
li ul li a { padding: 2px 5px; } /* Sub Menu Styles */
li:hover ul, li.over ul { display: block; } /* The magic */
</style>
<script type="text/javascript">
// drop_down.js
startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
for (i=0; i<navRoot.childNodes.length; i++) {
node = navRoot.childNodes[i];
if (node.nodeName=="LI") {
node.onmouseover=function() {
this.className+=" over";
}
node.onmouseout=function() {
this.className=this.className.replace(" over", "");
}
}
}
}
}
window.onload=startList;
</script>
</head>
<body>
<ul id="nav">
<li><a href="javascript:void(0);">Home</a></li>
<li><a href="javascript:void(0);">About</a>
<ul>
<li><a href="#">History</a></li>
<li><a href="#">Team</a></li>
<li><a href="#">Offices</a></li>
</ul>
</li>
<li><a href="javascript:void(0);">Services</a>
<ul>
<li><a href="#">Web Design</a></li>
<li><a href="#">Internet Marketing</a></li>
<li><a href="#">Hosting</a></li>
<li><a href="#">Domain Names</a></li>
<li><a href="#">Broadband</a></li>
</ul>
</li>
<li><a href="javascript:void(0);">Contact Us</a>
<ul>
<li><a href="#">United Kingdom</a></li>
<li><a href="#">France</a></li>
<li><a href="#">USA</a></li>
<li><a href="#">Australia</a></li>
</ul>
</li>
</ul>
</body>
</html>
<html><head><title>Horizontal Drop Down Menus</title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><style type="text/css">
body { font: normal 12px verdana; }
body ul { margin: 0; padding: 0; list-style: none; width: 130px; /* Width of Menu Items */ border-bottom: 1px solid #ccc; }ul li { position: relative; } li ul { position: absolute; left: 129px; /* Set 1px less than menu width */ top: 0; display: none; }/* Styles for Menu Items */ul li a { display: block; text-decoration: none; color: #666; background: #fff; /* IE6 Bug */ padding: 5px; border: 1px solid #ccc; border-bottom: 0; }/* Fix IE. Hide from IE Mac */* html ul li { float: left; height: 1%; }* html ul li a { height: 1%; }/* End */ul li a:hover { color: #E2144A; background: #f9f9f9; } /* Hover Styles */ li ul li a { padding: 2px 5px; } /* Sub Menu Styles */ li:hover ul, li.over ul { display: block; } /* The magic */</style><script type="text/javascript">// drop_down.jsstartList = function() { if (document.all&&document.getElementById) { navRoot = document.getElementById("nav"); for (i=0; i<navRoot.childNodes.length; i++) { node = navRoot.childNodes[i]; if (node.nodeName=="LI") { node.onmouseover=function() { this.className+=" over"; } node.onmouseout=function() { this.className=this.className.replace(" over", ""); } } } }}window.onload=startList;</script></head><body> <ul id="nav"> <li><a href="javascript:void(0);">Home</a></li> <li><a href="javascript:void(0);">About</a> <ul> <li><a href="#">History</a></li> <li><a href="#">Team</a></li> <li><a href="#">Offices</a></li> </ul> </li> <li><a href="javascript:void(0);">Services</a> <ul> <li><a href="#">Web Design</a></li> <li><a href="#">Internet Marketing</a></li> <li><a href="#">Hosting</a></li> <li><a href="#">Domain Names</a></li> <li><a href="#">Broadband</a></li> </ul> </li> <li><a href="javascript:void(0);">Contact Us</a> <ul> <li><a href="#">United Kingdom</a></li> <li><a href="#">France</a></li> <li><a href="#">USA</a></li> <li><a href="#">Australia</a></li> </ul> </li> </ul> </body></html>
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