Jquery之Ajax实例_用户名检查

一、Register.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Register.aspx.cs" Inherits="WebApp.Register" %>

<!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 src="../Js/jquery-1.7.1.js"></script>
    <script type="text/javascript">
        $(function () {
            $("#msg").css("display","none");
            $("#txtUserName").blur(function () {
                var userName = $(this).val();
                if (userName != "") {
                    $.post("CheckUserName.ashx", { "name":  userName }, function (data) {
                        $("#msg").css("display", "block");
                        $("#msg").text(data);
                    });
                } else {
                    alert("用户名不能为空!!");
                }
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            用户名:<input type="text" name="txtName" id="txtUserName" /><span id="msg" style="font-size: 14px; color: red"></span><br />
            密码:<input type="password" name="txtPWD" /><br />
            <input type="submit" value="注册" />
        </div>
    </form>
</body>
</html>

二、CheckUserName.ashx代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApp
{
    /// <summary>
    /// CheckUserName 的摘要说明
    /// </summary>
    public class CheckUserName : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string userName = context.Request["name"];
            //BLL.UserInfoService UserInfoService = new BLL.UserInfoService();
            //if (UserInfoService.GetUserInfo(userName) != null)
            if(userName== "zhangsan")
            {
                context.Response.Write("此用户名已存在!!");
            }
            else
            {
                context.Response.Write("此用户名可用!!");
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

三、效果演示

Jquery之Ajax实例_用户名检查

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