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<!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></title>
<style type ="text/css">
html,body{width:100%;height:100%}
ul{padding:0px;margin:0px;list-style:none;}
li{cursor:pointer;padding:0px 5px; line-height:25px;height:25px;}
</style>
</head>
<body>
<p>
<input type='text' id='txtInput' onkeyup='getSearchKeys()'/>
<div id='divShow' style="position:absolute; z-index:9999; width:200px; height:auto; display:none;border:1px solid #ddd">
<ul>
<li>aaa</li>
</ul>
</div>
</p>
</body>
<script type="text/javascript">
var keys=['ada','sdfsd','bbb','sfga','dfhgfh','235s','dfew','ghjk','hjkghjk','fgjgfjf','fghjgfj','2345f','fthtr','sfgerw','tyerth','vnmu','wertewr','wert','asdfaf','zxcvd','gkju','dvfgdh','2354af','adsf','erterter','fghdfg','xvdfg','kjhu','qweasdas','xzce','werwre','zzczc','rtewtrew']; // 搜索值,可以用Ajax从数据库获取
var txtInput ;
var divShow ;
window.onload=function()
{
txtInput =document.getElementById("txtInput");
divShow = document.getElementById("divShow");
var p =getAbsPoint(txtInput);
divShow.style.left = p.x +'px';
divShow.style.top = p.y + txtInput.offsetHeight + 'px';
txtInput.onclick = divShow.onclick=function(e)
{
e = e||event;
var t = e.target||e.srcElement
if(t.tagName.toLowerCase()=='li')
{
txtInput.value = t.innerHTML;
divShow.style.display = "none";
return;
}
if(e && e.stopPropagation){
//W3C取消冒泡事件
e.stopPropagation();
}else{
//IE取消冒泡事件
window.event.cancelBubble = true;
}
};
document.body.onclick=function(e)
{
divShow.style.display = "none";
};
};
function getSearchKeys()
{
var s= txtInput.value;
if(s=='')
{
divShow.style.display = "none";
return;
}
var arr=['<ul>'];
for(var i=0;i<keys.length;i++)
{
if(keys[i].indexOf(s)>=0){
arr.push('<li>'+keys[i]+'</li>');
}
}
if(arr.length>1){
arr.push('</ul>');
divShow.innerHTML = arr.join('');
divShow.style.display = "block";
}else{
divShow.style.display = "none";
}
}
function getAbsPoint(e)
{
var x = e.offsetLeft;
var y = e.offsetTop;
while(e = e.offsetParent)
{
x += e.offsetLeft;
y += e.offsetTop;
}
return {"x": x, "y": y};
}
</script>
</html>