ajax验证输入数据代码
那位大哥有ajax验证注册数据验证的代码，给个参考一下吧。最好能实现异步传输，验证用户名是否存在。
最近刚在网上看到一个，然后自己修改一下，还有很多不足的地方，自己改改吧，要是改得更好了，麻烦通知一下，让我也学一下
index.asp
[CODE]
<script language="javascript" type="text/javascript">
var xmlHttp = false;
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttp = false;
}
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
xmlHttp = new XMLHttpRequest();
}
function callServer() {
var u_name = document.getElementById("u_name").value;
if ((u_name == null) || (u_name == "")) return;
var url = "cu.asp?name=" + escape(u_name);
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);
}
function updatePage() {
if (xmlHttp.readyState < 4) {
test1.innerHTML="loading...";
}
if (xmlHttp.readyState == 4) {
var response = xmlHttp.responseText;
test1.innerHTML=response;
}
if (test1.innerHTML=="已被注册"){
document.form1.submit.disabled=true}
else{
document.form1.submit.disabled=false
}
}
</script>
<form name="form1" action="t1.asp" method="post" autocomplete="off">
用户名: <input type="text" name="u_name" id="u_name" onkeyup="callServer();" />
<span id="test1">是否能注册</span><br>
密 码：<input type="password" />
<input type="submit" name="submit" value="注册" />
</form>
<%Session.CodePage=936%>
[/CODE]
cu.asp
[CODE]<%
Response.Buffer = True
Response.ExpiresAbsolute = Now() - 1
Response.Expires = 0
Response.CacheControl = "no-cache"
Response.AddHeader "Pragma", "No-Cache"
%>
<!--#include file="conn.asp"-->
<%
name=request.querystring("name")
if Len(name)<4 or Len(name)>20 then
response.write("长度不对")
else
Set rs = Server.CreateObject ("ADODB.Recordset")
sql = "Select * from u_ser where u_name='"&name&"'"
rs.Open sql,conn,1,1
if rs.eof and rs.bof then
response.write("可以注册")
else
response.write("已被注册")
end if
rs.close
set rs=nothing
end if
call CloseDatabase
%>[/CODE]
conn.asp
自己写吧！！
[此贴子已经被作者于2006-8-7 11:06:33编辑过]
