用javascript美化Select
源代码：
<!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" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="Content-Language" content="zh-CN" />
<title>用javascript美化Select</title>
<script type="text/javascript">
var childCreate=false;
function Offset(e)
//取标签的绝对位置
{
var t = e.offsetTop;
var l = e.offsetLeft;
var w = e.offsetWidth;
var h = e.offsetHeight-2;
while(e=e.offsetParent)
{
t+=e.offsetTop;
l+=e.offsetLeft;
}
return {
top : t,
left : l,
width : w,
height : h
}
}
function loadSelect(obj){
//第一步：取得Select所在的位置
var offset=Offset(obj);
//第二步：将真的select隐藏
obj.style.display="none";
//第三步：虚拟一个div出来代替select
var iDiv = document.createElement("div");
iDiv.id="selectof" + obj.name;
iDiv.style.position = "absolute";
iDiv.style.width=offset.width + "px";
iDiv.style.height=offset.height + "px";
iDiv.style.top=offset.top + "px";
iDiv.style.left=offset.left + "px";
iDiv.style.background="url(/articleimg/2007/04/4687/icon_select.gif) no-repeat right 4px";
iDiv.style.border="1px solid #3366ff";
iDiv.style.fontSize="12px";
iDiv.style.lineHeight=offset.height + "px";
iDiv.style.textIndent="4px";
document.body.appendChild(iDiv);
//第四步：将select中默认的选项显示出来
var tValue=obj.options[obj.selectedIndex].innerHTML;
iDiv.innerHTML=tValue;
//第五步：模拟鼠标点击
iDiv.onmouseover=function(){//鼠标移到
iDiv.style.background="url(/articleimg/2007/04/4687/icon_select_focus.gif) no-repeat right 4px";
}
iDiv.onmouseout=function(){//鼠标移走
iDiv.style.background="url(/articleimg/2007/04/4687/icon_select.gif) no-repeat right 4px";
}
iDiv.onclick=function(){//鼠标点击
if (document.getElementById("selectchild" + obj.name)){
//判断是否创建过div
if (childCreate){
//判断当前的下拉是不是打开状态，如果是打开的就关闭掉。是关闭的就打开。
document.getElementById("selectchild" + obj.name).style.display="none";
childCreate=false;
}else{
document.getElementById("selectchild" + obj.name).style.display="";
childCreate=true;
}
}else{
//初始一个div放在上一个div下边，当options的替身。
var cDiv = document.createElement("div");
cDiv.id="selectchild" + obj.name;
cDiv.style.position = "absolute";
cDiv.style.width=offset.width + "px";
cDiv.style.height=obj.options.length *20 + "px";
cDiv.style.top=(offset.top+offset.height+2) + "px";
cDiv.style.left=offset.left + "px";
cDiv.style.background="#f7f7f7";
cDiv.style.border="1px solid silver";
var uUl = document.createElement("ul");
uUl.id="uUlchild" + obj.name;
uUl.style.listStyle="none";
uUl.style.margin="0";
uUl.style.padding="0";
uUl.style.fontSize="12px";
cDiv.appendChild(uUl);
document.body.appendChild(cDiv);
childCreate=true;
for (var i=0;i<obj.options.length;i++){
//将原始的select标签中的options添加到li中
var lLi=document.createElement("li");
lLi.id=obj.options[i].value;
lLi.style.textIndent="4px";
lLi.style.height="20px";
lLi.style.lineHeight="20px";
lLi.innerHTML=obj.options[i].innerHTML;
uUl.appendChild(lLi);
}
var liObj=document.getElementById("uUlchild" + obj.name).getElementsByTagName("li");
for (var j=0;j<obj.options.length;j++){
//为li标签添加鼠标事件
liObj[j].onmouseover=function(){
this.style.background="gray";
this.style.color="white";
}
liObj[j].onmouseout=function(){
this.style.background="white";
this.style.color="black";
}
liObj[j].onclick=function(){
//做两件事情，一是将用户选择的保存到原始select标签中，要不做的再好看表单递交后也获取不到select的值了。
obj.options.length=0;
obj.options[0]=new Option(this.innerHTML,this.id);
//同时我们把下拉的关闭掉。
document.getElementById("selectchild" + obj.name).style.display="none";
childCreate=false;
iDiv.innerHTML=this.innerHTML;
}
}
}
}
}
</script>
<style type="text/css">
select{200px;height:20px;}
</style>
</head>
<body>
<h1>用javascript模拟select达到美化效果</h1>
<form name="f">
<fieldset>
<legend>用户注册</legend>
<div>
<label for="username">帐号</label>
<input type="text" id="username" name="username" />
</div>
<div>
<label for="pwd">密码</label>
<input type="password" name="pwd" id="pwd" />
</div>
<div>
<label for="province">省份</label>
<select id="province" name="province">
<option value="10">江西</option>
<option value="11">福建</option>
<option value="12">广东</option>
<option value="13">浙江</option>
</select>
</div>
</fieldset>
<input type="submit" value="提交" name="btnSub" />
</form>
<script type="text/javascript">
loadSelect(document.f.province);
</script>
<p>
<a href="http://www.iwcn.net">作者博客</a>
</p>
</body>
</html></font>
效果：