参考代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> simulate combox control -
http://www.never-online.net </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style>
body, input
{
font-family: verdana;
font-size: 9pt;
}
h1
{
font-family: tahoma;
font-size: 22pt;
text-align: left;
}
pre
{
font-size: 9pt;
font-family: verdana;
border: 1px solid #006600;
width: 400px;
padding: 10px;
background: #ffffff;
color: #006600;
}
.CtlSelect
{
border: 1px solid #006600;
font-family: verdana;
height: 20px;
color: #006600;
background: #ffffff;
/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected
{
background: #006600;
color: #ffffff;
height: 20px;
}
.unselected
{
height: 20px;
color: #006600;
line-height: 120%;
border-bottom: 1px solid #006600;
}
.CtlSelect1
{
border: 1px solid #003399;
font-family: verdana;
height: 20px;
color: #003399;
background: #ffffff;
/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected1
{
background: #003399;
color: #ffffff;
height: 20px;
}
.unselected1
{
height: 20px;
color: #003399;
line-height: 120%;
border-bottom: 1px solid #003399;
}
.CtlSelect2
{
border: 1px solid #990000;
font-family: verdana;
height: 20px;
color: #990000;
background: #ffffff;
/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected2
{
background: #990000;
color: #ffffff;
height: 20px;
}
.unselected2
{
height: 20px;
color: #990000;
line-height: 120%;
border-bottom: 1px solid #990000;
}
.copyright
{
margin-top: 10px;
font-size: 9pt;
text-align: center;
color: #333;
font-weight: bold;
}
</style>
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
//-------------------------------------------------------------
// @ Module: simulate select control, IE only.
// @ Debug in: IE 6.0
// @ Script by: blueDestiny, never-online
// @ Updated: 2006-3-22
// @ Version: 1.0 apha
// @ Email: blueDestiny [at] 126.com
// @ Website:
http://www.never-online.net// @ Please Hold this item please.
//
// API
// @ class: simulateSelect()
//
// @ object.style(ctlStyle[,selStyle][,unselStyle])
// ctlStyle: main control combox css class name
// selStyle: when mouseover or option focus css class name
// unselStyle: options blur's css class name
//
// @ object.width=(widthPX)
// widthPX must be a digit number.
//
// @ object.height=(heightPX)
// heightPX must be a digit number.
//
// @ object.getValue(ctlSelID)
// ctlSelID is the unique select control ID
//
// -------------- for the next Version ----------
// @ object.readOnly = (blnReadOnly)
// blnReadOnly must be a boolean type or a number type.
// @ object.addEvent(w, h)
// w: fire handler's event.
// h: handler function.
//-------------------------------------------------------------
function $(objID)
{
return document.getElementById(objID);
};
function Offset(e)
{
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 simulateSelect(handlerFunction) { with(this)
{
this.IDs = [];
this.name = this;
this.value = null;
this.onchangeArgs = [];
this.onchange = handlerFunction;
this.height = 20;
this.width = null;
this.number = null;
this.ctlStyle = "CtlSelect";
this.selStyle = "selected";
this.unselStyle = "unselected";
this.elementPrefix = "e__";
this.inputPrefix = "i__";
this.containerPrefix = "c__";
this.buttonPrefix = "b__";
// property for beta Version
// can editable combox
this.readonly = true;
if( arguments.length>0 )
for(var i=0; i<arguments.length; i++)
onchangeArgs[i-1] = arguments
;
return this;
}};
simulateSelect.prototype.init = function(ctlSelIDs) { with(this)
{
eval(name).append(ctlSelIDs);
eval(name).simulates();
}};
simulateSelect.prototype.style = function() { with(this)
{
ctlStyle = arguments[0];
selStyle = arguments[1];
unselStyle = arguments[2];
}};
//-----------------------------------------------
simulateSelect.prototype.append = function(ctlSelIDs) { with(this)
{
if( ctlSelIDs.indexOf(",")>0 )
{
var arrCtlSel = ctlSelIDs.split(",");
for(var i=0; i<arrCtlSel.length; i++)
{
IDs.push(arrCtlSel);
}
}
else
IDs.push(ctlSelIDs);
}};
simulateSelect.prototype.checkupOnMouseDown = function(e) { with(this)
{
// here compatible mf.
var el = e ? e.srcElement : e.target;
if( el.id.indexOf(elementPrefix)>-1 ||
el.id.indexOf(inputPrefix)>-1 ||
el.id.indexOf(containerPrefix)>-1 ||
el.id.indexOf(buttonPrefix)>-1 )
{
return;
}
else
{
for(var i=0; i<eval(name).IDs.length; i++)
if( $(containerPrefix + IDs) )
$(containerPrefix + IDs).style.display = "none";
}
}};
simulateSelect.prototype.simulates = function() { with(this)
{
for(var i=0; i<IDs.length; i++)
eval(name).simulate(IDs);
}};
simulateSelect.prototype.simulate = function(ctlSelID) { with (this)
{
var input;
var button;
var object;
var offset;
object = $(ctlSelID);
offset = Offset(object);
input = document.createElement("INPUT");
button = document.createElement("BUTTON");
button.setAttribute("id", buttonPrefix + ctlSelID);
//button.value = "⊿";
button.value = "6";
button.style.fontFamily = "Webdings, Marlett";
button.style.background = "";
button.onclick = input.onclick = function()
{
this.blur();
eval(name).expand(ctlSelID, offset);
};
input.onselectstart = function()
{
eval(name).expand(ctlSelID, offset);
event.returnValue = false;
};
input.setAttribute("id", inputPrefix + ctlSelID);
input.title = button.title = "click expand options";
input.style.cursor = button.style.cursor = "default";
input.className = button.className = ctlStyle;
input.style.width = (width>0 ? width : object.offsetWidth);
height ? input.style.height=button.style.height=height : "";
input.value = value = object[0].text;
if( readonly==true ) input.readOnly=true;
// this method is only IE.
object.insertAdjacentElement("afterEnd",button);
object.insertAdjacentElement("afterEnd",input);
object.style.display = 'none';
}};
simulateSelect.prototype.expand = function(ctlSelID, offset) { with(this)
{
var div;
var object = $(ctlSelID);
if( !$(containerPrefix + ctlSelID) )
{
div = document.createElement("DIV");
div.style.position = "absolute";
div.style.display = "block";
div.setAttribute("id", containerPrefix + ctlSelID);
div.className = ctlStyle;
div.style.left = offset.left;
div.style.top = offset.top + offset.height;
div.style.width = (width ? width : offset.width) + 20;
if( number )
{
div.style.height = height * number;
div.style.overflow = "auto";
}
document.body.appendChild(div);
for(var i=0; i<object.length; i++)
{
div = document.createElement("DIV");
div.setAttribute("id", div.id = elementPrefix + ctlSelID + i);
div.style.cursor = "default";
if( object.text==$(inputPrefix + ctlSelID).value )
div.className = selStyle;
else
div.className = unselStyle;
div.innerText = div.title = object.text;
div.style.height = height;
div.setAttribute("value", object.value);
div.onmouseover = function()
{
for(var j=0; j<$(containerPrefix + ctlSelID).childNodes.length; j++)
{
if($(containerPrefix + ctlSelID).childNodes[j]==this)
$(containerPrefix + ctlSelID).childNodes[j].className = selStyle;
else
$(containerPrefix + ctlSelID).childNodes[j].className = unselStyle;
}
};
div.onclick = function()
{
$(inputPrefix + ctlSelID).value = this.innerText;
$(containerPrefix + ctlSelID).style.display = "none";
if( onchange && value!=$(inputPrefix + ctlSelID).value )
{
onchange.apply(this,onchangeArgs);
value = $(inputPrefix + ctlSelID).value;
}
};
$(containerPrefix + ctlSelID).appendChild(div);
}
return;
}
if( $(containerPrefix + ctlSelID).style.display=="none" )
{
for(var i=0; i<object.length; i++)
{
if( object.text==$(inputPrefix + ctlSelID).value )
$(elementPrefix + ctlSelID + i).className = selStyle;
else
$(elementPrefix + ctlSelID + i).className = unselStyle;
}
$(containerPrefix + ctlSelID).style.display="block";
return;
}
if( $(containerPrefix + ctlSelID).style.display=="block" )
{
$(containerPrefix + ctlSelID).style.display="none";
return;
}
}};
simulateSelect.prototype.getValue = function(ctlSelID) { with(this)
{
if( $(inputPrefix + ctlSelID) )
return $(inputPrefix + ctlSelID).value;
else
return null;
}};
simulateSelect.prototype.addEvent = function(w, h) { with(this)
{
}};
//-----------------------------------------------
//window.onerror = Function("return true;");
// IE only.
document.attachEvent("onmousedown", function() {
a.checkupOnMouseDown(event);
b.checkupOnMouseDown(event);
c.checkupOnMouseDown(event)
});
window.attachEvent("onload", function() {
window.a = new simulateSelect();
a.style("CtlSelect", "selected", "unselected");
a.init("s1");
//-------------------------------------------
window.b = new simulateSelect();
b.style("CtlSelect1", "selected1", "unselected1");
b.width = 300;
b.number = 9;
b.init("s2");
//-------------------------------------------
window.c = new simulateSelect(s1onchange, "never-online", a.getValue('s1'));
c.style("CtlSelect2", "selected2", "unselected2");
c.width = 320;
c.init("s3");
});
function s1onchange(para, s)
{
alert("onchage handler fire " + para + s);
}
//-->
</SCRIPT>
<h1> simulate combox control </h1>
<h4> demonstrate </h4>
<p>
normal select: <select id="s0">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">option1</option>
<option value="2">option2</option>
<option value="3">option3</option>
<option value="4">option4</option>
<option value="5">option5</option>
</select>
</p>
<p>
simulate select: <select id="s1">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">1option1</option>
<option value="2">1option2</option>
<option value="3">1option3</option>
<option value="4">1option4</option>
<option value="5">1option5</option>
</select>
</p>
<p>
scroll simulate select: <select id="s2">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">2option1</option>
<option value="2">2option2</option>
<option value="3">2option3</option>
<option value="4">2option4</option>
<option value="5">2option6</option>
<option value="5">2option7</option>
<option value="5">2option8</option>
<option value="5">2option9</option>
<option value="5">2option10</option>
<option value="5">2option11</option>
<option value="5">2option12</option>
<option value="5">2option13</option>
<option value="5">2option14</option>
</select>
</p>
<p>
onchange handler fire: <select id="s3">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">3option1</option>
<option value="2">3option2</option>
<option value="3">3option3</option>
<option value="4">3option4</option>
<option value="5">3option5</option>
</select>
</p>
<button onclick="alert(a.getValue('s1') + '\n\n' + b.getValue('s2') + '\n\n' + c.getValue('s3'))" class="CtlSelect"> Get value </button>
<button onclick="alert('next version')" class="CtlSelect">append item</button>
<button onclick="alert('next version')" class="CtlSelect">remove item</button>
<h4> description </h4>
<pre>
//-------------------------------------------------------------
// @ Module: simulate select control, IE only.
// @ Debug in: IE 6.0
// @ Script by: blueDestiny, never-online
// @ Updated: 2006-3-22
// @ Version: 1.0 apha
// @ Email: blueDestiny [at] 126.com
// @ Website: http://www.never-online.net
// @ Please Hold this item please.
//
// API
// @ class: simulateSelect()
//
// @ object.style(ctlStyle[,selStyle][,unselStyle])
// ctlStyle: main control combox css class name
// selStyle: when mouseover or option focus css class name
// unselStyle: options blur's css class name
//
// @ object.width=(widthPX)
// widthPX must be a digit number.
//
// @ object.height=(heightPX)
// heightPX must be a digit number.
//
// @ object.getValue(ctlSelID)
// ctlSelID is the unique select control ID
//
// -------------- for the next Version ----------
// @ object.readOnly = (blnReadOnly)
// blnReadOnly must be a boolean type or a number type.
// @ object.addEvent(w, h)
// w: fire handler's event.
// h: handler function.
//-------------------------------------------------------------
</pre>
<div class="copyright">
Power By blueDestiny, never-online
http://www.never-online.net
</div>
</BODY>
</HTML>
