使用JavaScript美化Select选项-优快云博客

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta http-equiv="Content-Language" content="zh-CN" />
<title>用javascript美化Select</title>
<style type="text/css">
* { margin:0; padding:0; }
body { margin:50px; }
.iDiv {
	position:absolute;
	height:19px;
	font-size:12px;
	color:#333;
	line-height:19px;
	text-indent:4px;
	vertical-align:middle;
	border:1px solid #7f9db9;
	cursor:default;
	cursor:pointer;
	background:url(http://pet.runsky.com/img/select_bg.gif) no-repeat 100% 0;
}
.iDiv_over { color:#f96; background-position:100% -25px; }
.iDiv_out { color:#333; background-position:100% 0; }
.cDiv {
	position:absolute;
	moz-user-select:none;
	border:1px solid #7f9db9;
	cursor:default;
	background:#fff;
	overflow:auto;
	z-index:1;
}
.cDiv ul {
	font-size:12px;
	color:#878787;
	listStyle:none;
	margin:0;
	padding:0;
}
.cDiv ul li {
	height:24px;
	line-height:24px;
	text-indent:4px;
}
</style>
<script type="text/javascript">
// JavaScript Document
function $() {
	return document.getElementById(arguments[0]);
}
//
function getCurrentStyle(o) {
	return o.currentStyle||document.defaultView.getComputedStyle(o,null);
}
var SetAllSelects = {
	Offset:function(e) {
		var t = e.offsetTop;
		var l = e.offsetLeft;
		var w = e.offsetWidth;
		var h = e.offsetHeight;
		while(e = e.offsetParent) { t += e.offsetTop; l += e.offsetLeft; }
		return {top:t, left:l, width:w,	height:h};
	},
	setCreated:function(obj,status) { 
		obj.setAttribute("childCreated",status);
	},
	getCreated:function(obj) { 
		var status = obj.getAttribute("childCreated");
		if(status == null) { status = ""; }
		return status;
	},
	setSelectStyle:function(obj,idnum,showHeight) {
		if(obj.id == null || obj.id == "") { obj.id = "selectID_"+idnum; }
		var offset = this.Offset(obj);
		obj.style.visibility = "hidden";
		var mainDiv = document.createElement("div");
		var iDiv = document.createElement("div");
		var js_select_;
		var _this = this;
		iDiv.className = "iDiv";
		iDiv.id = js_select_+obj.id;
		iDiv.style.width = offset.width + "px";
		iDiv.style.top = offset.top + "px";
		iDiv.style.left = offset.left + "px";
		this.setCreated(iDiv,"");
		mainDiv.appendChild(iDiv);
		var tValue = obj.options[obj.selectedIndex].innerHTML;
		iDiv.innerHTML = tValue;
		iDiv.onmouseover = function() { iDiv.className = "iDiv iDiv_over"; }
		iDiv.onmouseout = function() { iDiv.className = "iDiv iDiv_out"; }
		iDiv.onclick = function() {
			var created = _this.getCreated(this);
			if (created != "") {
				if (created == "open") {
					this.nextSibling.style.display = "none";
					_this.setCreated(this,"close");
				}
				else {
					_this.setCreated(this,"open");
					var arrLiObj = this.nextSibling.getElementsByTagName("li");
					var selOjbIndex = 0;
					for(var i=0;i<arrLiObj.length;i++) {
						var status = arrLiObj[i].getAttribute("liSelected");
						if(status == null) { status = ""; }
						if(status == "selected") { selOjbIndex = i; break; }
					}
					arrLiObj[selOjbIndex].style.background = "#fff";
					arrLiObj[selOjbIndex].style.color = "#878787";
					this.nextSibling.style.display = "block";
				}
			}
			else {
				_this.setCreated(this,"open");
				var cDiv = document.createElement("div");
				cDiv.className = "cDiv";
				cDiv.style.width = offset.width + "px";
				cDiv.style.height = obj.options.length * 19 + "px";
				if(parseInt(cDiv.style.height)>showHeight) {
					cDiv.style.height = showHeight + "px";
				}
				cDiv.style.top = (offset.top+parseInt(getCurrentStyle(this).height)+1) + "px";
				cDiv.style.left = offset.left + "px";
				cDiv.onselectstart = function() {return false;};
				var uUl = document.createElement("ul");
				cDiv.appendChild(uUl);
				mainDiv.appendChild(cDiv);
				for (var i=0;i<obj.options.length;i++) {
					var lLi = document.createElement("li");
					lLi.id = obj.options[i].value;
					lLi.innerHTML = obj.options[i].innerHTML;
					lLi.sValue = obj.options[i].value;
					uUl.appendChild(lLi);
				}
				var liObj = uUl.getElementsByTagName("li");
				if(liObj.length>0) {
					for (var j=0;j<obj.options.length;j++) {
						liObj[j].onmouseover = function() {
							var arrLiObj = this.parentNode.getElementsByTagName("li");
							for(var i=0;i<arrLiObj.length;i++) {
								var status = "";
								var _background = "#ccc";
								var _color = "#000";
								if(arrLiObj[i] != this) {
									_background = "#fff";
									_color = "#878787";
									status = "selected";
								}
								arrLiObj[i].style.background = _background;
								arrLiObj[i].style.color = _color;
								arrLiObj[i].setAttribute("liSelected",status);
							}
						}
						liObj[j].onclick = function() {
							obj.options.length = 0;
							obj.options[0] = new Option(this.innerHTML,this.sValue);
							this.parentNode.parentNode.style.display = "none";
							_this.setCreated(this.parentNode.parentNode.previousSibling,"close");
							iDiv.innerHTML = this.innerHTML;
						};
						liObj[0].style.background = "#ccc";
						liObj[0].style.color = "#000";
						liObj[0].setAttribute("liSelected","selected");
					}
				}
			}
		}
		document.body.appendChild(mainDiv);
	},
	setAllSelectStyle:function() {
		var s = document.getElementsByTagName("select");
		for (var i=0; i<s.length; i++) {
			if(s[i].className == "select") {
				this.setSelectStyle(s[i],i,200);
			}
		}
	}
}
document.onclick = function(e) {
	e = e || window.event;
	var target = e.target || event.srcElement;
	var s = document.getElementsByTagName("select");
	var js_select_;
	for (var i=0; i<s.length; i++) {
		if(s[i].className == "select") {
			var objdivtmp = $(js_select_+s[i].id);
			var created = SetAllSelects.getCreated(objdivtmp);
			if (created == "open") {
				if(target != objdivtmp) {
					objdivtmp.nextSibling.style.display = "none";
					SetAllSelects.setCreated(objdivtmp,"close");
				}
			}
		}
	}
}
window.onload = function() {
	SetAllSelects.setAllSelectStyle();
}
function getValue() {
	var kk = document.getElementsByTagName('select')[0];
	return kk.options[kk.selectedIndex].value;
}
function getTxt() {
	var kk = document.getElementsByTagName('select')[0];
	return kk.options[kk.selectedIndex].innerHTML;
}
</script>
</head>
<body>
	<select class="select">
        <option value="3_1">选择</option>
        <option value="3_2">选择3_22_22_22_2</option>
        <option value="3_3">选择3_22_22_22_3</option>
        <option value="3_4">选择3_22_22_22_4</option>
        <option value="3_5">选择3_22_22_22_5</option>
        <option value="3_6">选择3_22_22_22_6</option>
        <option value="3_7">选择3_22_22_22_7</option>
        <option value="3_8">选择3_22_22_22_8</option>
        <option value="3_9">选择3_22_22_22_9</option>
        <option value="3_10">选择3_22_22_22_10</option>
        <option value="3_11">选择3_22_22_22_11</option>
        <option value="3_12">选择3_22_22_22_12</option>
        <option value="3_13">选择3_22_22_22_13</option>
        <option value="3_14">选择3_22_22_22_14</option>
        <option value="3_15">选择3_22_22_22_15</option>
        <option value="3_16">选择3_22_22_22_16</option>
  	</select>


</body>
</html>
美观下拉框实例2
