<%@ Page Language="C#" AutoEventWireup="true" CodeFile="regdemo.aspx.cs" Inherits="regdemo" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script type="text/javascript">
function loadXMLDoc() {
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function ()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("myuser").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "./ajax/checkuser.aspx?username="+ document.getElementById('Text1').value +"", true);
xmlhttp.send(null);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
用户:
<input id="Text1" type="text" onchange ="loadXMLDoc()" /><label id="myuser" style="color:red;"></label><br />
<br />
密码:
<input id="Text2" type="text" />
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using CnxinwaDll;
public partial class ajax_checkuser : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request["username"].ToString() == "") {
Response.Write("用户名不能为空");
Response.Flush();
Response.End();
}
else if (isexit(Request["username"].ToString()))
{
Response.Write("用户名存在,不可以注册:" + Request["username"].ToString());
Response.Flush();
Response.End();
}
else if (!isexit(Request["username"].ToString()))
{
Response.Write("用户名不存在,可以注册:" + Request["username"].ToString());
Response.Flush();
Response.End();
}
}
/// <summary>
/// 验证用户账号是否存在,存在返回TRUE否则返回FALSE
/// </summary>
/// <param name="uname"></param>
/// <returns></returns>
protected Boolean isexit(string uname) {
Data.sqlstr = "select c003 from cnxinwa002 where c002='" + uname + "' ";
if (Data.GetDataSet(Data.sqlstr).Tables[0].Rows.Count > 0)
{
return true;
}
else
{
return false;
}
}
}
