基于jquery实现的可以编辑选择的下拉框的代码

效果图：
代码如下：
<!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"> 
<head> 
<title>可以编辑的下来框实现方法--woody.wu</title> 
<style type="text/css"> 
.cssINPUT 
{ 
height: 19PX; 
padding: 3PX; 
padding-left: 3px; 
padding-right: 0px; 
margin: 0PX; 
border: 1PX SOLID #C0C0C0; 
font-family: 宋体,arial; 
font-size: 9pt; 
} 
.select_div_list 
{ 
position: absolute; 
border: 1px solid black; 
background-color: White; 
overflow: hidden; 
overflow-y: auto; 
} 
.select_div_list_ul 
{ 
margin: 0px; 
padding: 0px; 
list-style-type: none; 
} 
.select_div_list_ul li 
{ 
cursor: pointer; 
padding-left: 3px; 
font-family: 宋体,arial; 
font-size: 9pt; *padding:0px;*height:20px;_height:14px;_margin:0px;_height:14px;*margin:0px;line-height:14px;} 
.selectSPAN 
{ 
background-color: Yellow; 
} 
</style> 
<script type="text/javascript" src="Js/jquery-1.4.2.min.js"></script> 
<script type="text/javascript"> 
var inputID = "input1"; 
var selectID = "select1"; 
var widt = 0; 
var inputWi = 0; 
var he = 0; 
$(function() { 
inputID = "input1"; 
selectID = "select1"; 
widt = 200; 
inputWi = widt - 20; 
he = $("#user").height() - 41; 
var offset = $("input[id=input1]").offset(); 
$("#" + selectID).change(function() { 
var newvar = $("#" + selectID).find("option:selected").text(); 
$("#" + inputID).val(newvar); 
}).click(function() { 
$("#select_div_on_key" + selectID).remove(); 
}).css({ "display": "block", "width": widt + "px", "z-index": 1, "clip": "rect(0px " + widt + "px 51px 151px)" }); 
$("#" + inputID).keyup(function() { 
ShowSelectCombo(); 
}).click(function() { 
ShowSelectCombo(); 
}).css({ "z-index": 2, "width": inputWi + "px" }); ; 
}); 
function ShowSelectCombo() { 
var pob = $("#" + inputID); 
var v = pob.val(); 
var off = pob.offset(); 
var wi = pob.width() + 16; 
var tp = off.top + pob.height() - 100 + 7; 
var lef = off.left - 200 + 2; 
var html = "<div class='select_div_list' id='select_div_on_key" + selectID + "' style='width:" + wi + "px;top:" + tp + "px;left:" + lef + "px;'><ul class='select_div_list_ul'>"; 
$("#" + selectID).find("option").each(function() { 
var tk = $(this); 
html += "<li val='" + tk.val() + "' ht='" + encodeURIComponent(tk.html()) + "'>" + tk.html().replace(v, "<span class='selectSPAN'>" + v + "</span>") + "</li>"; 
}); 
html += "</ul></div>"; 
var ulDIV = $("#select_div_on_key" + selectID); 
ulDIV.remove(); 
$("#user").append(html); 
var ulDIV = $("#select_div_on_key" + selectID); 
var hei = ulDIV.find("ul").height(); 
var newHeight = hei > he ? he : hei; 
ulDIV.css({ height: newHeight + "px" }); 
ulDIV.find("li").hover(function() { 
$(this).css({ "background-color": "#316ac5" }); 
}, function() { 
$(this).css({ "background-color": "white" }); 
}); 
ulDIV.find("li").click(function() { 
var ki = $(this); 
var va = ki.attr("val"); 
var htm = ki.attr("ht"); 
htm = decodeURIComponent(htm); 
$("#" + inputID).val(htm); 
$("#" + selectID).val(va); 
ulDIV.remove(); 
}); 
} 
</script> 
</head> 
<body> 
<form name="form1" method="post" action="qqq.aspx" id="form1"> 
<div> 
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTIxMjQ5OTYwOTdkZH49VftoWVz/vaIL4f2byf4/w86b" /> 
</div> 
<div> 
<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWDwL15JrvCgL2jaW0BgL3jaW0BgL0jaW0BgL1jaW0BgLyjaW0BgLzjaW0BgLwjaW0BgLujaW0BgL3jeW3BgKm4u6hCAL3je23BgL3jdG3BgL3jdW3BgL3jdm3BnqAGtu2PbiTi9dWHvWrW6QCqrYo" /> 
</div> 
<div style='position: absolute; top: 100px; width: 500px; left: 200px; padding: 10px; 
height: 400px; border: 1px solid red;' id='user'> 
<div> 
<div style='overflow: hidden; margin-top: 10px; height: 30px;'> 
<input id="input1" name="input1" type="text" class='cssINPUT' style='_height: 20px; 
*height: 13px; display: block; float: left; position: absolute; border-right: 0px;' /> 
<select name="select1" id="select1" class="cssINPUT" style="float: left; 
display: none; height: 27PX; position: absolute; cursor: pointer; margin-left: 2px; 
padding: 0px;"> 
<option value="1">車身和底盤修整設備</option> 
<option value="2">真空吸盤</option> 
<option value="3">氧/乙炔焊割工具</option> 
<option value="4">冷鉚机 </option> 
<option value="5">大市場撒旦</option> 
<option value="6">大擦</option> 
<option value="7">第三十</option> 
<option value="9">大市場</option> 
<option value="20">車身外形修复机（介子机）</option> 
<option value="1022">沙皮狗</option> 
<option value="22">整形机</option> 
<option value="23">舉升机</option> 
<option value="24">修車躺板</option> 
<option value="25">空調制冷劑充注机 </option> 
</select> 
</div> 
</div> 
</form> 
</body> 
</html> 