<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>模拟select
下拉菜单_www.jb200.com</title>
<style type="text/css">
body{margin:20px auto;font-family:Arial, Helvetica, sans-serif;font-size:12px;width:950px;height:400px;border:solid 1px #aaa; position:relative;padding:10px;}
ul{margin:0;padding:0;list-style:none;}
.dropDownList{position:absolute;left:100px;top:100px;}
/* .dropDownList div.dropdown select{display:none;}*/
.dropDownList div.dropdown{float:left;margin-right:50px;width:200px;}
.dropDownList span{display:block;width:146px;height:26px;background:url(/images/select.gif) left top no-repeat;
line-height:26px;text-indent:12px;border:solid 1px #83BBD9;cursor:default;}
.dropDownList span.over{background-position:left bottom;border-color:#B4C91A;}
.dropDownList ul{background:#eee;width:200px;display:none;}
.dropDownList ul li{height:20px;width:100%;padding:3px 0;text-indent:12px;cursor:default;}
.dropDownList ul li.over{background:#ccc;}
.dropDownList ul.show{display:block;}
</style>
</head>
<body>
<h1>
javascript模拟下拉菜单</h1>
<form action="#" method="get">
<div class="dropDownList">
<div id="dropDownList1" class="dropdown">
<select name="birthday">
<option>请选择</option>
<option>1988</option>
<option>1989</option>
</select>
<span>请选择年份</span>
<ul></ul>
</div>
<div id="dropDownList2" class="dropdown">
<select name="sex">
<option>性别</option>
<option>男</option>
<option>女</option>
</select>
<span>请选择性别</span>
<ul></ul>
</div>
<div id="dropDownList3" class="dropdown">
<select name="student">
<option>幼儿班</option>
<option>小学</option>
<option>初中</option>
</select>
<span>请选择学历</span>
<ul></ul>
</div>
</div>
</form>
</body>
</html>
<script type="text/javascript">
// JavaScript Document
var ____configArray;
function __initDropDownList(configArray){
//获取Select菜单
____configArray=configArray;
var existArray=configArray.split("|");
for(var i=0;i<existArray.length;i++){
if(existArray[i].length<1){return;}
//根据参数分别获取div，并分别添加事件
var parentContainer=document.getElementById(existArray[i]);
if(!parentContainer){return;}
//获取下面的select，且获取其中的option
var selectObj=parentContainer.getElementsByTagName("select");
if(selectObj.length<1){return;}
var optionArray=selectObj[0].getElementsByTagName("option");
//获取option，并分别添加到各个li
var optionLength=optionArray.length;
for(var j=0;j<optionLength;j++){
//获取ul，以便能够添加项目
var ulObj=parentContainer.getElementsByTagName("ul");
if(ulObj.length<1){return;}
//获取span，以便能显示当前选择的项目
var spanObj=parentContainer.getElementsByTagName("span");
if(spanObj.length<1){return;}
var liObj=document.createElement("li");
var textNode=document.createTextNode(optionArray[j].firstChild.nodeValue)
liObj.appendChild(textNode);
liObj.setAttribute("currentIndex",j);
//给每个liObj添加事件
liObj.onclick=function(){
selectCurrentItem(this.parentNode,this);
}
liObj.onmouseover=function(){this.className="over";}
liObj.onmouseout=function(){this.className="";}
ulObj[0].appendChild(liObj);
spanObj[0].onclick=function(event){
//如果当前是显示的，就隐藏，反之亦然
showHiddenUl(this);
}
spanObj[0].onmouseover=function(){this.className='over';}
spanObj[0].onmouseout=function(){this.className="";};
ulObj[0].onclick=function(){this.className="";}
}
parentContainer.onclick=function(event){
if(!event){event=window.event;}
//阻止事件冒泡
event.cancelBubble=true;
var eventUlObj=this.getElementsByTagName("ul")[0];
bodyClickHiddenUl(eventUlObj);
}
}
}
function selectCurrentItem(ulObj,currentObj){
var parentObj=ulObj.parentNode;
var spanObj=parentObj.getElementsByTagName("span")[0];
spanObj.firstChild.nodeValue=currentObj.firstChild.nodeValue;
var selectObj=parentObj.getElementsByTagName("select")[0];
selectObj.selectedIndex=parseInt(currentObj.getAttribute("currentIndex"));
}
function showHiddenUl(currentObj){
var parentNode=currentObj.parentNode;
var ulObj=parentNode.getElementsByTagName("ul")[0];
if(ulObj.className==""){
ulObj.className="show";
}else{
ulObj.className="";
}
}
//点击body区域（非"下拉菜单"）隐藏菜单
function addBodyClick(func) {
var bodyObj=document.getElementsByTagName("body")[0];
var oldBodyClick = bodyObj.onclick;
if (typeof bodyObj.onclick != 'function') {
bodyObj.onclick = func;
} else {
bodyObj.onclick = function() {
oldBodyClick();
func();
}
}
}
//隐藏所有的UL
function bodyClickHiddenUl(eventUlObj){
var existArray=____configArray.split("|");
for(var i=0;i<existArray.length;i++){
if(existArray[i].length<1){return;}
//寻找所有UL并且隐藏
var parentContainer=document.getElementById(existArray[i]);
if(!parentContainer){return;}
var ulObj=parentContainer.getElementsByTagName("ul");
if(eventUlObj!=ulObj[0]){
ulObj[0].className="";
}
}
}
var __dropDownList="dropDownList1|dropDownList2|dropDownList3";
__initDropDownList(__dropDownList);
//添加这个可以确保点击body区域的时候 也可以隐藏菜单
addBodyClick(bodyClickHiddenUl);
</script>
