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由于系统自带的Select实在是不好用,这里我用javascript写了一个全新的Select.

功能:
  1.可编辑的Select
  2.长度可以随意修改
  3.可以遮盖系统Select
  4.支持forms
  5.支持CSS修改外观

使用方法
var 实体化变量=new editselect(名字,长度,默认字符串,宽度,高度,只读)
实体化变量.add(option数值)

这只是一个测试版,很多功能没有完善,比如没有区分value和caption等等,希望大家提出宝贵意见.

<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>用Javascript编写的一个全新的Select >>webjx.com</title><script>scHTML='<div id="selectcontent" class="selectdiv" style="visibility:hidden;"><iframe id=selframe frameborder=0 height=100%></iframe><div id="selecthtml" class="selectcontent">select&Aacute;&ETH;&#177;&#237;</div></div>'document.write(scHTML)vDiv=selectcontentvDivHtml=selecthtmlfunction editselect(name,size,defaulttext,width,height,readonly){  var combo=this;  this.options=new Array();  this.name=name;  this.divname=name '_div';  this.buttonname=name '_button';  this.tablename=name '_table';  this.htmltable=name '_html'    if (!height) this.height=0; else this.height=height  if (width) this.width=width  if (!size) size=8  if (!defaulttext) defaulttext=""  if (!readonly || readonly==0) {readonly="" }else {if (readonly==1) readonly="readonly style=cursor:default";this.readonly=1}    esHTML='<div id=' this.divname '>'          '<table id=' this.tablename ' cellpadding=0 cellspacing=0 class=select><tr><td bgcolor=#FFFFFF>'          '<input type=text class=selecttext size="' size '" name=' name ' value="' defaulttext '" ' readonly '><td><button class=selectbutton id=' this.buttonname '>6</td></tr></table>'          '</div>'  document.write(esHTML)  this.sbutton=eval("document.all." this.buttonname)    if (this.readonly==1) eval(this.name).onclick=function(){combo.show()}      this.sbutton.onclick=function(){combo.show()}  this.show=function(){    pDiv=eval(combo.divname)    pTable=eval(combo.tablename)    var vHTML='<table id=htmltable cellspacing="0" cellpadding="2" bgcolor="#ffffff" class="selecttable" width=100%>'    for (i=0;i<combo.options.length;i  )      {       vHTML ='<tr onmouseover="mo(this)" onmouseout="mu(this)" onclick="document.all.' combo.name '.value=this.innerText;selectcontent.style.visibility=\'hidden\'"><td nowrap>' combo.options[i]      }     vHTML ="</table>"    vDivHtml.innerHTML=vHTML        vtop=pDiv.offsetTop pDiv.offsetHeight    vleft=pDiv.offsetLeft 1            vParent = pDiv.offsetParent;      while (vParent.tagName.toUpperCase() != "BODY")  {    vleft  = vParent.offsetLeft;    vtop  = vParent.offsetTop;    vParent = vParent.offsetParent;  }   var redge=document.body.clientWidth-vleft   var bedge=document.body.clientHeight-vtop       if (!combo.width) {vDiv.style.width=pTable.offsetWidth} else {vDiv.style.width=combo.width}        if (combo.height==0)      {        vDiv.style.pixelHeight=parseInt(htmltable.offsetHeight) 2        vDivHtml.style.pixelHeight=parseInt(htmltable.offsetHeight) 2      }      else      {         if (htmltable.offsetHeight>combo.height)          {            vDiv.style.pixelHeight=combo.height            vDivHtml.style.pixelHeight=combo.height            }            else            {                        vDiv.style.pixelHeight=parseInt(htmltable.offsetHeight) 2              vDivHtml.style.pixelHeight=parseInt(htmltable.offsetHeight) 2           }          }        vDivHtml.scrollTop=0        if (redge<vDiv.offsetWidth)      vDiv.style.left=vleft-1-(vDiv.offsetWidth-redge)        else      vDiv.style.left=vleft-1         if (bedge<vDiv.offsetHeight)    //vDiv.style.top=vtop-vDiv.offsetHeight-pDiv.offsetHeight    vDiv.style.top=vtop-vDiv.offsetHeight bedge         else      vDiv.style.top=vtop              vDivHtml.style.width=parseInt(vDiv.style.width)      vDiv.style.visibility="visible"  }    this.add=function(text){     combo.options[combo.options.length]=text  }    this.about=function(){   }}function mo(obj){obj.style.backgroundColor="#000099"obj.style.color="#ffffff"}function mu(obj){obj.style.backgroundColor=""obj.style.color="#000000"}document.onmousedown=function(){if (vDiv.style.visibility=="visible"){mx=event.x   document.body.scrollLeftmy=event.y   document.body.scrollTop;x1=vDiv.offsetLefty1=vDiv.offsetTopx2=vDiv.offsetLeft vDiv.offsetWidthy2=vDiv.offsetTop vDiv.offsetHeightif (mx<x1 || my<y1 || x2<mx || y2<my)    {      vDiv.style.visibility='hidden'   }}}</script><style>.selecttext{border:0pxheight: 16;font-family:arial;font-size:12px;}.selectbutton{font-family:webdings;font-size:10px;height: 19;width: 16; border:1px solid #83A5EB;line-height:0px;padding-bottom:3px;background-color:#D1E0FD}.selecttable{font-family:arial;font-size:12px;cursor:default;}.selectcontent{position: absolute;top:0;left:0;overflow:auto;border:1px solid #000000}.selectdiv{position: absolute; width:100;overflow:hidden;}.select{border-collapse: collapse;border:1px solid #7F9DB9}</style></head><body bgcolor="#83A5EB"><table border="0" width="100%">  <tr>    <td width="151" align="center"><font size="2">可编辑的Select</font></td>    <td><script>var sel1=new editselect("select1","25","可编辑的Select","");sel1.add("这是一个可以编辑的Select")sel1.add("支持CSS")sel1.add("可以通过CSS,修改外形")sel1.add("突破原来的Select诸多限制")</script></td>  </tr>  <tr>    <td width="151" align="center"><font size="2">长度可以随意修改<br>可以设置为只读</font></td>    <td>    <script>var sel2=new editselect("select2","20","长度可以随意修改",250,82,1);sel2.add("这是一个可以编辑的Select")sel2.add("支持CSS")sel2.add("可以通过CSS,修改外形")sel2.add("作者:舜子制作")sel2.add("MSN:puterjam@msn.com")</script>    </td>  </tr>  <tr>    <td width="151" align="center"><font size="2">可以遮盖系统Select</font></td>    <td>    <script>var sel3=new editselect("select3","25","可以遮盖系统Select","",41);sel3.add("这是一个可以编辑的Select")sel3.add("支持CSS")sel3.add("可以通过CSS,修改外形")sel3.add("突破原来的Select诸多限制")</script>    </td>  </tr>  <tr>    <td width="151" align="right"> </td>    <td><select><option>系统的Select</option></select> </td>  </tr></table></body></html>

    

        

            


作者:gdgzboy@牛C网
地址:http://www.niuc.net/post/2696/
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