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今天剛剛看到羅亭的許可.
"請勿做商用".
說明:
1.羅亭的可輸入下拉框是個加密版.(變量名,函數名都被替換成數字)
2.函數眾多.比如添加刪除OPTION等被簡化掉了.各位可以參考羅亭的貼子.
總之,這個要小上一點.看起來也可能會清楚點.

test.html
<HTML>
<HEAD>
<TITLE>compobox</TITLE>
<META http-equiv=Content-Type content="text/html; charset=shift_JIS">


<SCRIPT TYPE="text/javascript" src="ComboBox.js"></SCRIPT>
</HEAD>
<BODY onload="init();">
<form name="form1">


<table border="1" width="395">
<tr>
<td width="140">input web address:</td>
<td width="216">
<select id="comboBox1" style="POSITION: absolute;
onResize="if (combox1!=null) {combox1.doResize();}"
onChange="if (combox1!=null) {combox1.doChange();}" name="select2">


<option value=www.51js.com selected>www.51js.com</option>
<option value=www.ccbfu.com>www.ccbfu.com</option>
<option value=www.sina.com.cn>www.sina.com.cn</option>
</select>
　 </td>
</tr>
<tr>
<td width="140">input web address:</td>
<td height="200" width="216">


<select id="comboBox2" style="POSITION: absolute"
onResize="if (combox2!=null) {combox2.doResize();}"
onChange="if (combox2!=null) {combox2.doChange();}" name="select">
<option value=www.51js.com selected>www.51js.com</option>
<option value=www.ccbfu.com>www.ccbfu.com</option>
<option value=www.sina.com.cn>www.sina.com.cn</option>
</select>
　</td>
</tr>


<input type="submit" value="submit">
<SCRIPT>
var combox1,combox2;
function init()
{
combox1 = new combobox("comboBox1", "combox1");
combox1.doSelectIdx(-1);

combox2 = new combobox("comboBox2", "combox2");
combox2.doSelectIdx(-1);
}
</SCRIPT>
</form>
</BODY>
</HTML>

ComboBox.js

function getLeftPostion( theObj )
{
var pos = 0;
while ( theObj != null )
{
pos += theObj.offsetLeft;
//get the Object which contain theObj.
theObj = theObj.offsetParent;
}
return pos;
}
function getTopPostion( theObj )
{
var pos = 0;
while ( theObj != null )
{
pos += theObj.offsetTop;
//get the Object which contain theObj.
theObj = theObj.offsetParent;
}
return pos;
}
function checkVersion()
{
var isBadVersion=true;
var curVer=navigator.appVersion;
var pos=parseInt(curVer.indexOf("MSIE"));
if (pos>=1)
{
var intVer=parseInt(curVer.charAt(pos+5));
if (intVer>=5)
{ isBadVersion=false;}
}
if (isBadVersion)
{
var msg="This page may not be displayed properly:\n"+
" This product requires Microsoft Internet Explorer 5 or later browser only.";
alert(msg);
}
}

//check the browser version
checkVersion();

// the array of comboBoies
theArray = new Array();

function combobox(objId, objHandler)
{
this.comObj = document.all[objId];
this.comObj.selectedIndex = -1;
this.getValue = getValue;
this.doResize = doResize;
this.doChange = doChange;
this.loseFocus = loseFocus;
this.doSelectIdx = doSelectIdx;
this.focus = focus;

var strMsg="";

//------------------------------------------------------------------------------------------------------
// create the text object
//------------------------------------------------------------------------------------------------------
var txtObjIdName = objId + "_text";

if (document.all[txtObjIdName] != null)
{
strMsg="The following id: '" + txtObjIdName +"' is used internally by the Combo Box!\r\n"+
"Use of this id in your page may cause malfunction. Please use another id for your controls.";
alert(strMsg);
}

var txtInner = "<INPUT type='text' id=" + txtObjIdName + " name=" + txtObjIdName +
" onblur='" + objHandler + ".loseFocus()' " +
" style='display: none; position: absolute' value='' >";

this.comObj.insertAdjacentHTML("afterEnd", txtInner);

this.txtObj = document.all[txtObjIdName];
//------------------------------------------------------------------------------------------------------
// end
//------------------------------------------------------------------------------------------------------

this.beResizing = false;
this.doResize();
theArray[theArray.length] = this;
}

function loseFocus()
{
var theComObj = this.comObj;
var theTxtObj = this.txtObj;
var i;
theComObj.selectedIndex = -1;

if (theTxtObj.value == "")
{ return; }

var optLen = theComObj.options.length;
for (i=0; i<optLen; i++)
{
var comVal = theComObj.options[i].text;
var txtVal = theTxtObj.value;

if (comVal == txtVal)
{ theComObj.selectedIndex = i;
return;
}
}
}

function doResize()
{
if (!this.beResizing)
{
this.beResizing = true;
this.txtObj.style.display="none";
this.comObj.style.position="static";
this.txtObj.style.posLeft = getLeftPostion(this.comObj);
this.txtObj.style.posTop = getTopPostion(this.comObj) + 1;
this.txtObj.style.posWidth = this.comObj.offsetWidth - 16;
this.txtObj.style.posHeight = this.comObj.offsetHeight;
this.comObj.style.position ="absolute";
this.comObj.style.posLeft = this.txtObj.style.posLeft;
this.comObj.style.posTop = this.txtObj.style.posTop;
this.offWidth = this.comObj.offsetWidth;
var strRect = "rect(0 "+(this.comObj.offsetWidth)+" "+ this.comObj.offsetHeight +
" "+(this.txtObj.style.posWidth - 2 )+")";

this.comObj.style.clip = strRect;
this.txtObj.style.display="";
this.beResizing = false;
}
}

function doChange()
{
var idx = this.comObj.selectedIndex;
var opt = this.comObj.options[idx];
this.txtObj.value = opt.text;
this.txtObj.focus();
this.txtObj.select();
this.comObj.selectedIndex=-1;
}

function getValue()
{ return this.txtObj.value; }

function doSelectIdx(i)
{
var optLen = this.comObj.options.length;

if ((i >=0) && (i < optLen))
{ this.comObj.selectedIndex = i;
this.txtObj.value = this.comObj.options[i].text;
return;
}

this.txtObj.value = "";
}

function focus()
{ this.txtObj.focus(); }

/* resize all combobox when window be resized */
function resetAllSize()
{
var i;
for (i=0; i < theArray.length; i++)
{
theArray[i].doResize();
}
}

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