js 漂亮的仿combox控件下拉菜单效果

作者：袖梨 2022-07-02

提示：您可以先修改部分代码再运行

js 漂亮的仿combox控件下拉菜单效果
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>js 漂亮的仿combox控件下拉菜单效果</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">

<style type="text/<a href="http://www.111com.net/cssdiv/css.html" target="_blank">css</a>">
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;
	
	padding: 10px;
	background: #ffffff;
	color: #006600;
}
.CtlSelect
{
	border: 1px solid #006600;
	font-family: verdana;
	
	color: #006600;
	background: #ffffff;
	/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected
{
	background: #006600;
	color: #ffffff;
	
}
.unselected
{
	
	color: #006600;
	line-height: 120%;
	border-bottom: 1px solid #006600;
}
.CtlSelect1
{
	border: 1px solid #003399;
	font-family: verdana;
	
	color: #003399;
	background: #ffffff;
	/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected1
{
	background: #003399;
	color: #ffffff;
	
}
.unselected1
{
	
	color: #003399;
	line-height: 120%;
	border-bottom: 1px solid #003399;
}
.CtlSelect2
{
	border: 1px solid #990000;
	font-family: verdana;
	
	color: #990000;
	background: #ffffff;
	/*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg);*/
}
.selected2
{
	background: #990000;
	color: #ffffff;
	
}
.unselected2
{
	
	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">
<!--

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.;
	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[i];
	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[i]);
		}
	}
	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[i]) )
		$(containerPrefix + IDs[i]).style.display = "none";
	}
}};
simulateSelect.prototype.simulates = function() { with(this)
{
	for(var i=0; i<IDs.length; i++)
	eval(name).simulate(IDs[i]);
}};
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 = "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.";
	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[i].text==$(inputPrefix + ctlSelID).value )
			div.className = selStyle;
			else
			div.className = unselStyle;
			div.innerText = div.title = object[i].text;
			div.style.height = height;
			div.setAttribute("value", object[i].value);
			div.onmouseover = function()
			{
				for(var j=0; j<$(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( $(containerPrefix + ctlSelID).style.display=="none" )
	{
		for(var i=0; i<object.length; i++)
		{
			if( object[i].text==$(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.;
	b.number = 9;
	b.init("s2");
	//-------------------------------------------
	window.c = new simulateSelect(s1onchange, "never-online", a.getValue('s1'));
	c.style("CtlSelect2", "selected2", "unselected2");
	c.;
	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') + 'nn' + b.getValue('s2') + 'nn' + 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>

</pre>
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</html>

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