asp.net+js实现的ajax sugguest搜索提示效果

效果图：


功能：
1、可以有方向键上下控制。
2、支持关键字高亮。(在该此次代码中省略)
3、对选中可按回车提交。

使用：重点关注id=tbxsearch和id=search_suggest这两个东东。html部分涉及到定位的问题，自己处理好，有问题可以提问，细节自己把握。

注明：在接收的那个文件，其实应该接收一个参数skey的，我先写死了。记得接收的时候先解码一次。

申明：阿会楠根据网上一份原作者不详的代码进行了修改，以适合自己的项目并增加了多个功能。此次放出的代码为基本实现代码，也是最接近原来的代码，略去其他功能。版权归原作者所有。

document.writeln(" <div style=\"position:relative;margin-left:100px;margin-top:100px;\">"); 
document.write("<input id='tbxsearch' value='' type='text' maxlength='100' onkeyup='suggest(event,this)' onblur='inputOnblur()' \/>"); 
document.write("<div id=\"search_suggest\" class=\"suggest\" style=\"display:none;\"><\/div><\/div>"); 
document.write("<style style=\"text/css\">"); 
document.write("body,input{font:12px tahoma;}"); 
document.write("#tbxsearch{width:250px;}"); 
document.write(".suggest{position:absolute;+left:6px;top:23px;z-index:999;background:#fff;width:250px;text-align:left;border:1px solid #000;height:auto!important;height:20px;min-height:20px;clear:both;}"); 
document.write(".suggestOver{background:#3366CC;padding:2px 0 2px 0;color:white;}"); 
document.write("<\/style>"); 
var $=function(Id){ 
return document.getElementById(Id)?document.getElementById(Id):null; 
}; 
var $ctag=function(tagName){ 
return document.createElement(tagName); 
}; 
var $ajax=function createXMLHttpRequest(){ 
var xmlHttp=false; 
try{ 
xmlHttp = new XMLHttpRequest(); 
} 
catch(trymicrosoft){ 
try{ 
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); 
} 
catch(othermicrosoft){ 
try{xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")} 
catch(failed){} 
} 
} 
return xmlHttp; 
}; 

var suggestDiv=$("search_suggest"); 
var keynodes; 
var lastKey=""; 
var selectedIndex=0; 
var showSuggest=function(inputObj){ 
var xmlHttp = $ajax(); 
var key=document.getElementById("tbxsearch").value; 
if(key==lastKey)return false; 
else lastkey=key; 
if(/^\s*$/.test(key)){ 
suggestDiv.style.display="none"; 
return false; 
}; 
selectedIndex=-1; 
xmlHttp.open("get","js/search.aspx?skey="+encodeURI(key)+"&t=" + new Date().getTime(),true); 
xmlHttp.onreadystatechange = function(){ 
if(xmlHttp.readyState == 4&&xmlHttp.status == 200){ 
var xmldoc=xmlHttp.responseXML; 
keynodes=xmldoc.getElementsByTagName("key"); 

if(keynodes.length>0) 
{ 
suggestDiv.innerHTML=""; 
for(var i=0;i<keynodes.length;i++){ 
var keyDiv=$ctag("div"); 
keyDiv.style.width="100%"; 
keyDiv.style.padding="0"; 
keyDiv.style.margin="2px 0 2px 0"; 
keyDiv.style.height="18px"; 
keyDiv.style.lineHeight="18px"; 
keyDiv.style.cursor="default"; 
keyDiv.style.textIndent = "4px"; 

keyDiv.innerHTML = keynodes[i].getAttribute("value"); 

keyDiv.onmouseover=function(){ 
selectedIndex=-1; 
divlist=suggestDiv.getElementsByTagName("div"); 
for(var k=0;k<divlist.length;k++){ 
divlist[k].className=""; 
if(divlist[k]==this)selectedIndex=k; 
} 
this.className="suggestOver"; 
}; 

keyDiv.onmouseout=function(){ 
this.className=""; 
}; 

keyDiv.onmousedown = function(){ 
document.getElementById("tbxsearch").value=this.innerHTML; 
//这里写执行搜索的代码 
}; 

suggestDiv.appendChild(keyDiv); 
}; 

suggestDiv.style.display="block"; 
}else{ 
suggestDiv.style.display="none"; 
} 
} 
}; 
xmlHttp.send(null); 
}; 
var changeSelect=function(isUp,inputObj){ 
if (isUp) selectedIndex++; 
else selectedIndex--; 
if(selectedIndex<0) selectedIndex=0; 
var divlist=suggestDiv.getElementsByTagName("div"); 
if(selectedIndex>=divlist.length) 
selectedIndex=divlist.length-1; 
for(var i=0;i<divlist.length;i++){ 
if(i==selectedIndex){ 
divlist[i].className="suggestOver"; 
inputObj.value=divlist[i].innerHTML.replace(/<[^>]+>/g,""); 
}else{ 
divlist[i].className=""; 
} 
} 
}; 
var suggest=function(event,inputObj){ 
event = event ? event : (window.event ? window.event : null); 
var keyCode=event.keyCode; 

if(keyCode==13){ 
if(selectedIndex != -1){ 
inputObj.value=keynodes[selectedIndex].getAttribute("value"); 
} 
//这里写执行搜索 
} 

if(keyCode==40||keyCode==38){ 
var isUp=false; 
if(keyCode==40) {isUp=true;} 
changeSelect(isUp,inputObj); 
}else{ 
showSuggest(inputObj); 
} 
}; 
var inputOnblur=function(){setTimeout('suggestDiv.style.display="none";',100);};

search.aspx代码：

<%@ Page Language="C#" %> 
<script runat="server"> 
protected void Page_Load(object sender, EventArgs e) 
{ 
if (!Page.IsPostBack) 
{ 
Response.ContentType = "text/xml"; 
Response.ContentEncoding = Encoding.GetEncoding("utf-8"); 
Response.Write("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"); 
Response.Write("<keylit>"); 
Response.Write("\t<key value=\"阿会楠一直在坚持走自己的路\" />\n"); 
Response.Write("\t<key value=\"阿会楠今年25岁了！\" />\n"); 
Response.Write("\t<key value=\"阿会楠现在在汕头！\" />\n"); 
Response.Write("\t<key value=\"阿会楠会回广州！\" />\n"); 
Response.Write("\t<key value=\"搜索吧是阿会楠在大学期间的作品之一！\" />\n"); 
Response.Write("\t<key value=\"sosuo8.com by ahuinan\" />\n"); 
Response.Write("</keylit>"); 

} 
} 
</script>

打包下载http://xiazai.jb51.net/200904/yuanma/ajaxsuggest.rar