asp.net+Ajax校验用户是否存在的实现代码

<%@ Page Language="C#" MasterPageFile="~/Top_Down.master" AutoEventWireup="true" CodeFile="RegisterMember.aspx.cs"Inherits="Member_RegisterMember" Title="注册用户" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

<link href="../Admin/css/template.css" rel="stylesheet" type="text/css" />

<link href="../Admin/css/validationEngine.jquery.css" rel="stylesheet" type="text/css" />

<script src="../Admin/scripts/jquery-1.7.1.min.js" type="text/javascript"></script>

<script src="../js/jquery.validationEngine.js" type="text/javascript"></script>

<script src="../Admin/scripts/isValid.js" type="text/javascript"></script>

<script src="../js/languages/jquery.validationEngine-zh_CN.js" type="text/javascript"></script>

<script type="text/javascript">

var IsCheck=false;

$(function(){

// binds form submission and fields to the validation engine

$("#form1").validationEngine();

//当鼠标失去焦点的时候验证

$("#txtUserName").blur(function(){

$.ajax({

url:"Data/GetMemberInfo.ashx?method=CheckExistUserName",

data:{"username":$("#txtUserName").val()},

type:"post",

success:function(text){

$("#tdUser").empty();//清空内容

var item;

if(text=="True"){

item='<img src="../images/ok.png"/>恭喜您,这个帐号可以注册!';

IsCheck=true;

}

else

item='<img src="../images/no.png"/>对不起,这个帐号已经有人注册了!';

$("#tdUser").append(item);

}

});

});

});

function CheckForm1()

{

if(IsCheck)

{

form1.submit();

}

else{

alert("请验证用户名");

}

}

</script>

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<form id="form1" action="Data/GetMemberInfo.ashx?method=SaveMemberInfo" method="post">

<div class="content">

<div class="left_side">

<div class="logo_bottom"></div>

</div>

<div class="right_side zhuce">

<div class="zhuce_title"><p class="hide">注册新用户</p></div>

<div class="zhuce_p">

<table width="578" class="zc_table1">

<tr>

<td width="93" class="zc_tar">用户名：</td>

<td width="200" class="zc_tal"><input type="text" class="zc_input1 validate[required,custom[LoginName]] text-input"name="txtUserName" id="txtUserName"/><!--LoginName-->

</td>

<td width="269" class="zc_font" id="tdUser"></td>

</tr>

<tr>

<td class="zc_tar">密码：</td>

<td class="zc_tal"><input type="password" class="zc_input2 validate[required,custom[LoginPwd]] text-input" id="txtPwd"name="txtPwd"/></td>

<td class="zc_font"></td>

</tr>

<tr>

<td class="zc_tar">确认密码：</td>

<td class="zc_tal"><input type="password" class="zc_input3 validate[required,equals[txtPwd] text-input" /></td>

<td class="zc_font"></td>

</tr>

<tr>

<td class="zc_tar">E-mail：</td>

<td class="zc_tal"><input type="text" class="zc_input4 validate[required,custom text-input" name="txtEmail"id="txtEmail"/></td>

<td class="zc_font"></td>

</tr>

<tr>

<td class="zc_tar">验证码：</td>

<td class="zc_tal" colspan="2"><input type="text" class="zc_input5" name="txtCheckCode" id="txtCheckCode"/><imgsrc="../Admin/FileManage/VerifyChars.ashx" alt="验证码" /></td>

</tr>

<tr><td>&nbsp;</td></tr>

<tr>

<td colspan="3" align="center"><a href="javascript:CheckForm1()"><img src="../images/zhuce_sumbit.png" /></a></td>

</tr>

</table>

</div>

</div>

</div>

</form>

</asp:Content>

<%@ WebHandler Language="C#" Class="GetMemberInfo" %>

using System;

using System.Web;

using Common;

using czcraft.Model;

using czcraft.BLL;

using System.Web.SessionState;

public class GetMemberInfo : IHttpHandler,IRequiresSessionState

{

// //记录日志

private static readonly log4net.ILog logger =log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

public void ProcessRequest(HttpContext context)

{

String methodName = context.Request["method"];

if (!string.IsNullOrEmpty(methodName))

CallMethod(methodName, context);

}

/// <summary>

/// 根据业务需求调用不同的方法

/// </summary>

/// <param name="Method">方法</param>

/// <param name="context">上下文</param>

public void CallMethod(string Method, HttpContext context)

{

switch (Method)

{

case "CheckExistUserName":

CheckExistUserName(context);

break;

//case "SearchMember":

// SearchMember(context);

// break;

case "SaveMemberInfo":

SaveMemberInfo(context);

break;

//case "RemoveMember":

// RemoveMember(context);

// break;

//case "GetMember":

// GetMember(context);

// break;

default:

return;

}

}

/// <summary>

/// 验证帐号是否存在

/// </summary>

/// <param name="context"></param>

public void CheckExistUserName(HttpContext context)

{

string username = context.Request["username"];

if (Tools.IsValidInput(ref username, true))

{

context.Response.Write(new memberBLL().CheckExistUserName(username));

}

}

/// <summary>

/// 保存用户信息

/// </summary>

/// <param name="context"></param>

public void SaveMemberInfo(HttpContext context)

{

try

{

//表单读取

string txtUserName = context.Request["txtUserName"];

string txtPwd = context.Request["txtPwd"];

string txtEmail = context.Request["txtEmail"];

string txtCheckCode = context.Request["txtCheckCode"];

//验证码校验

if (!txtCheckCode.Equals(context.Session["checkcode"].ToString()))

{

return;

}

//字符串sql注入检测

if (Tools.IsValidInput(ref txtUserName, true) && Tools.IsValidInput(ref txtPwd, true) && Tools.IsValidInput(ref txtEmail, true))

{

member info = new member();

info.username = txtUserName;

info.password = txtPwd;

info.Email = txtEmail;

info.states = "0";

if (new memberBLL().AddNew(info) > 0)

{

SMTP smtp = new SMTP(info.Email);

string webpath = context.Request.Url.Scheme + "://" + context.Request.Url.Authority + "/Default.aspx";

smtp.Activation(webpath, info.username);//发送激活邮件

JScript.AlertAndRedirect("注册用户成功!!", "../Default.aspx");

}

else {

JScript.AlertAndRedirect("注册用户失败!", "../Default.aspx");

}

}

}

catch (Exception ex)

{

logger.Error("错误!", ex);

}

}

public bool IsReusable {

get {

return false;

}

}

}