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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ajaxCheckName.aspx.cs" Inherits="ajaxCheckName" %>
<!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 runat="server">
<title></title>
<script type="text/javascript" language="javascript">
var xmlHttp = null;
function CheckUser()
{
try
{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(err1)
{
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(err2)
{
xmlHttp = new XMLHttpRequest();
}
}
var Text1 = document.getElementById("Text1");
var url = "chkuser.aspx?User=" + Text1.value;
xmlHttp.open("GET",url,true);
xmlHttp.onreadystatechange = OnHandler;
xmlHttp.send(null);
}
function OnHandler()
{
if(xmlHttp.readyState == 4)
{
var isValid = xmlHttp.responseText;
var exists = document.getElementById("exsits");
exists.innerHTML = isValid.substring(0,4);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Text1" type="text" onblur="CheckUser()" /><label id="exsits"></label><br /><br />
</div>
</form>
</body>
</html>
protected void Page_Load(object sender, EventArgs e)
{
string user = this.Request.QueryString["User"];
if (UserExist(user))
{
Response.Write("存在");
}
else
{
Response.Write("不存在");
}
}
// 验证方法,根据情况替换改方法
private bool UserExist(string username)
{
if (username == "1")
{
return true;
}
else
{
return false;
}
}