<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>下拉菜单</title>
<style type="text/css">
body,ul,li{ margin:0; padding:0; font-size:13px;}
ul,li{list-style:none;}
#divselect{width:186px; margin:80px auto; position:relative; z-index:10000;}
#divselect cite{width:150px; height:24px;line-height:24px; display:block; color:#807a62; cursor:pointer;font-style:normal;
padding-left:4px; padding-right:30px; border:1px solid #333333; }
#divselect ul{width:184px;border:1px solid #333333; background-color:#ffffff; position:absolute; z-index:20000; margin-top:-1px; display:none;}
#divselect ul li{height:24px; line-height:24px;}
#divselect ul li a{display:block; height:24px; color:#333333; text-decoration:none; padding-left:10px; padding-right:10px;}
.upicon{float:right;margin-right:-24px;}
</style>
<script type="text/javascript">
window.onload=function(){
var box=document.getElementById('divselect'),
title=box.getElementsByTagName('cite')[0],
menu=box.getElementsByTagName('ul')[0],
as=box.getElementsByTagName('a');
// 点击三角时
title.onclick=function(event){
// 执行脚本
event=event||window.event;
if(event.stopPropagation){
event.stopPropagation();
}
else{
event.cancelBubble=true;
}
menu.style.display="block";
}
// 键盘上下移动，回车设置标题
var index=-1;
document.onkeyup=function(event){
for(i=0;i<as.length;i++){
as[i].style.background="";
}
if(event.keyCode==40){
index<as.length-1 ? index++ : index=0;
as[index].style.background="#ddd";
}
else if(event.keyCode==38){
index<=0 ? index=as.length-1 : index--;
as[index].style.background="#ddd";
}
else if(event.keyCode==13){
index>=0 ? hiddenMenu(index) : menu.style.display="none";
}
}
//鼠标滑过、离开、点击
for(i=index+1;i<as.length;i++){
as[i].style.background="";
as[i].bindex=i;
as[i].onmouseover=function(){
moveonLi(this);
index=this.bindex;
}
as[i].onclick=function(){
hiddenMenu(this.bindex);
}
}
// 定义隐藏列表并设置标题事件
function hiddenMenu(aindex){
menu.style.display="none";
title.innerHTML=as[aindex].innerHTML+'<i class="upicon">▼</i>';
}
// 定义选中对应选项事件
function moveonLi(e){
for(i=0;i<as.length;i++){
as[i].style.background="";
}
e.style.background="#ddd";
}
// 点击页面空白处时
document.onclick=function(){
menu.style.display="none";
}
}
</script>
</head>
<body>
<div id="divselect">
<cite>请选择分类<i class="upicon">▼</i></cite>
<ul>
<li id="li"><a href="javascript:;" selectid="1">ASP开发</a></li>
<li><a href="javascript:;" selectid="2">.NET开发</a></li>
<li><a href="javascript:;" selectid="3">PHP开发</a></li>
<li><a href="javascript:;" selectid="4">Javascript开发</a></li>
<li><a href="javascript:;" selectid="5">Java特效</a></li>
</ul>
</div>
</body>
</html>
