十分钟打造AutoComplete自动完成效果代码

var xmlHttp;
function createXmlHttpRequest()
{
if(window.ActieveXObject)
{
xmlHttp=new ActieveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp=new XMLHttpRequest();
}
}

function $E(argument)
{
return document.getElementById(argument);
}

function GetInfo(e)
{
var input=$E("Text1").value;
if(input.length<=0)
{
changeDisplay();
}
else
{
createXmlHttpRequest();
var keyword=e.value;

xmlHttp.onreadystatechange=readyStateChangeHandle;
var url="AutoComplete.ashx?keyword="+keyword+"&timeStamp="+new Date().getTime();
xmlHttp.open("GET",url,true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
xmlHttp.send(null);
}
}

function changecolor(event)
{

event.style.background="#00FFFF";

}
function changebackcolor(event)
{
event.style.background="#FFFFFF"
}

function ChangeDivDisplay(e)
{
document.getElementById("Text1").value=e.firstChild.data;
var html="";
document.getElementById("searchResult").innerHTML=html;
document.getElementById("searchResult").style.visibility="hidden";
}

function changeDisplay()
{
var html="";
document.getElementById("searchResult").innerHTML=html;
document.getElementById("searchResult").style.visibility="hidden";
}

function readyStateChangeHandle()
{
if(xmlHttp.readyState==4)
{
if(xmlHttp.status==200)
{

if(xmlHttp.responseText!="]")
{
var resultDiv=$E("searchResult");

var josnStr=eval('('+xmlHttp.responseText+')');
var html="";

for (var key in josnStr)
{

html+= "<span onmousemove=\"changecolor(this)\" onclick=\"ChangeDivDisplay(this)\" onmouseout=\"changebackcolor(this)\" style=\"width: 195px; text-align: left; background-color: #FFFFFF; display: block; cursor: default;\">"+josnStr[key].bookName +"<span style=\" color: #008000; float: right;\">"+josnStr[key].bookCount+"本书</span></span>";

}
html+= "<span style=\" width: 195px; background-color: #FFFFFF; display: block;\"><a href=\"javascript:changeDisplay()\" style=\"float: right;\">关闭</a></span>";

resultDiv.innerHTML=html;
document.getElementById("searchResult").style.visibility="visible";
}
else
{
changeDisplay();
}
}
}
}