<!doctype html>
<html >
<head>
<meta charset="gb2312">
<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;
background:url(xjt.png) no-repeat right center;
}
#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;
}
</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'),
index=-1;
// 点击三角时
title.onclick=function(e){
// 执行脚本
e = e || window.event;
if(e.stopPropagation){
e.stopPropagation();
}else{
e.cancelBubble = true;
}
menu.style.display = "block";
}
// 滑过滑过、离开、点击每个选项时
// 执行脚本
for(var i=0,l=as.length;i<l;i++){
as[i].onmouseover = function(){
this.style.backgroundColor = "#CCC";
}
as[i].onmouseout = function(){
this.style.backgroundColor = "#FFF";
}
as[i].onclick = function(){
title.innerHTML = this.innerHTML;
}
}
//keyup释放键盘的时候触发
//回车13，上38，下40
function Highlight(index){
for(var i=0;i<as.length;i++){
if(i!=index) as[i].style.backgroundColor = "#FFF";
else as[i].style.backgroundColor = "#CCC";
}
}
document.onkeyup = function(e){
if(menu.style.display == "block"){
if(e.keyCode == 40){
if(index == -1){
index = 0
}else
(index+1 == as.length) ? (index = 0) : (index = index +1);
Highlight(index);
}else if(e.keyCode == 38){
if(index == -1){
index = as.length-1;
}else
(index-1 == -1) ? (index = as.length-1) : (index = index -1);
Highlight(index);
}else if(e.keyCode == 13){
title.innerHTML = as[index].innerHTML;
as[index].style.backgroundColor = "#FFF";
index = -1;
menu.style.display = "none";
}
}
}
// 点击页面空白处时
// 执行脚本
document.onclick = function(e){
e = e || window.event;
if(e.stopPropagation){
e.stopPropagation();
}else{
e.cancelBubble = true;
}
menu.style.display = "none";
}
}
</script>
</head>
<body>
<div id="divselect">
<cite>请选择分类</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>
sissifly
2014-10-22
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