<!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" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>JS+CSS仿类似新浪微博搜索框的效果</title>
<style type="text/css">
* { padding:0; margin:0;}
body { font-size:14px; }
#box { width:600px; margin:40px auto;}
#in { width:240px; height:24px; line-height:24px; border:1px solid #369; border-radius:4px; box-shadow:inset 0 0 2px #999; }
#suggest { display:none; position:relative; margin-top:-1px; width:240px; padding-top:1px; border:1px solid #369; border-top:0 none;
border-radius:4px; box-shadow:inset 0 0 2px #999; overflow:hidden; }
#suggest a { display:block; color:#f00; height:24px; line-height:24px; text-decoration:none; padding:0 4px;}
#suggest a:hover { background:#eee;}
#suggest a span { color#369;}
</style>
<script type="text/javascript">
window.onload=function(){
//声明一坨变量供下面使用
var obox=document.getElementById("box");
obj=document.getElementById("in");
osug=document.getElementById("suggest");
oa=osug.getElementsByTagName("span");
//兼容ie和火狐浏览器的方式，但是经测试发现ie678可以ie9却不行在删除的时候无法触发，网上查下说有ie9这个问题
obj.oninput=obj.onpropertychange=onchange;
function onchange(){
var txt=this.value;
var words=txt.length;
if(words==0){
osug.style.display="none";
}else if(words<=8){
osug.style.display="block";
for( var i=0;len=oa.length,i<len;i++){
oa[i].innerHTML=txt;
}
}else if(words>8){
osug.style.display="block";
var limit=txt.substring(0,8)+"...";
for( var i=0;len=oa.length,i<len;i++){
oa[i].innerHTML=limit;
}
}
}
}
function disbox(){
document.getElementById("suggest").style.display="none";
}
</script>
</head>
<body>
<dl id="box">
<dt><input onblur="disbox()" type="text" name="" id="in" /></dt>
<dd id="suggest" >
<a href="###">搜“<span></span>”相关微博</a>
<a href="###">搜“<span></span>”相关用户</a>
</dd>
</dl>
</body>
</html>