用javascript模拟select达到美化效果
????<!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{width: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>
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