<script type="text/javascript" language="javascript">
function validateloginname()
{
var loginname=document.getElementById("Text1").value;
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
xmlHttp.onreadystatechange=getdata;
xmlHttp.Open("GET","validate.aspx?loginname="+loginname,true);
xmlHttp.Send();
}
function getdata()
{
if(xmlHttp.readystate==4)
{
if(xmlHttp.status==200)
{
var text=xmlHttp.responseText;
if(text=="1")
{
document.getElementById("td1").innerHTML="用户名已存在";
document.getElementById("Text1").style.borderColor="Black";
document.getElementById("Text1").focus();
document.getElementById("Text1").value="";
}
else
{
document.getElementById("td1").innerHTML="OK";
document.getElementById("Text1").style.borderColor="Red";
}
}
}
}
</script>
<td>
<input id="Text1" type="text" runat="server" onblur="validateloginname()" />
</td>
<td id="td1">
</td>validate.aspx
protected void Page_Load(object sender, EventArgs e)
{
string loginname = Request.QueryString["loginname"];
if (loginname == "mcluzhi")
{
Response.Write("1");
}
else
{
Response.Write("0");
}
}