转帖：用javascript美化Select

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">

<HTML lang=zh-CN xmlns="http://www.w3.org/1999/xhtml"><HEAD><TITLE>用javascript美化Select</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META http-equiv=Content-Language content=zh-CN>
<SCRIPT src="用javascript美化Select.files/select.js" type=text/javascript></SCRIPT>

<STYLE type=text/css>SELECT {
WIDTH: 200px; HEIGHT: 20px
}
</STYLE>

<META content="MSHTML 6.00.2900.5626" name=GENERATOR></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 id=username name=username> </DIV>
<DIV><LABEL for=pwd>密码</LABEL> <INPUT id=pwd type=password name=pwd> </DIV>
<DIV><LABEL for=province>省份</LABEL> <SELECT id=province name=province> <OPTION
value=10 selected>山东</OPTION> <OPTION value=11>山西</OPTION> <OPTION
value=12>广东</OPTION> <OPTION value=13>广州</OPTION></SELECT> </DIV></FIELDSET> <INPUT type=submit value=提交 name=btnSub> </FORM>
<SCRIPT type=text/javascript>
loadSelect(document.f.province);
</SCRIPT><BODY></HTML>

select.js内容

ar 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(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(icon_select_focus.gif) no-repeat right 4px";
}
iDiv.onmouseout=function(){//鼠标移走
  iDiv.style.background="url(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";