ajax 智能搜索

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Search.ascx.cs" Inherits="UserControls_Search" %>
<style>
   
 #search_suggest   
{   
position:absolute;   
background:#FFFFFF;   
text-align:left;   
border:1px #000000 solid;  
cursor:pointer;
display:none;
z-index:10;
251px;
}   
 
.suggest_link_over   
{   
background-color:#e8f2fe;   
padding:2px 6px;
font-weight:bold;
color:red;
cursor:pointer;
display:block;
}   
.suggest_link   
{   
padding:2px 6px;   
background-color:#FFFFFF;   
}   

</style>

<script language="javascript" type="text/javascript">

    //创建Aajx对象
    function createXmlHttpRequest() {
        var xmlhttp = null;
        try {
            xmlhttp = XMLHttpRequest();
        } catch (e1) {
            try {
                xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
            } catch (e2) {
                try {
                    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e3) {
                    xmlhttp = false;
                    alert("创建失败!");
                }
            }
        }
        return xmlhttp;
    }
   
var xmlHttp = createXmlHttpRequest();

//删除字符串前后空白
function Trim(strToString)
{
    return strToString.replace(/^\s\s*/,'').replace(/\s\s*$/,'');
}

//输入框发生变化时
function change_key(){
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0){
   var str = Trim(escape(document.getElementById("keyword").value));
 
   if (str!=''){
       xmlHttp.open("get", "AjaxSearch.aspx?key=" + str, true);
    xmlHttp.onreadystatechange = handSearchRequest;
    xmlHttp.send(null);
   }
}
}

//接收对象，并从"|"分隔
function handSearchRequest(){
if (xmlHttp.readyState == 4){
   var div = document.getElementById("search_suggest");
   div.innerHTML = "";
   var str = xmlHttp.responseText.split("|");
  $("search_suggest").innerHTML="";
   for (var i=0; i<str.length; i++){
    var suggest = '<div onmouseover="javascript:suggestOver(this);"';
    suggest +=' onmouseout="javascript:suggestOut(this);"';
    suggest += ' onclick="javascript:setSearch(this.innerHTML);"';
    suggest +=' class="suggest_link">' + str[i] + '</div>';
 
   $("search_suggest").innerHTML += suggest;
  
   }
    $("search_suggest").style.display="block";
  
   $("search_suggest").innerHTML +="<div class='c' onclick='c_close()'>Close It</div>";
   Mka_1();
  
}
}

//关闭录入框
function c_close(){
  $("search_suggest").style.display="none";
}

function Mka_1(){
e = $("keyword");
var t=e.offsetTop;
var l=e.offsetLeft;
while(e=e.offsetParent){
 t+=e.offsetTop;
 l+=e.offsetLeft;
}
$("search_suggest").style.top=t+20;
$("search_suggest").style.left=l;
}

function $(d)
{
 return document.getElementById(d);
}

function setSearch(div_value){
document.getElementById("keyword").value = div_value;
$("search_suggest").style.display="none";
}

function suggestOver(div_value){
div_value.className ='suggest_link_over';
}

function suggestOut(div_value){
div_value.className ='suggest_link';
}
function b_hide()
{
 //$("search_suggest").style.display="none";
}

</script>

 <div id="sp" style=" margin-left:20px;">
     <input name="keyword" type="text" class="srchTxt" id="keyword" value="" size="35" maxlength="256" autocomplete="off" onkeyup="change_key()" onblur="b_hide()"/>
     
     <input type="image" name="imageField" src="http://images.cnblogs.com/search.gif" />
   
   <div id="search_suggest"></div>
</div>