<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Register.aspx.cs" Inherits="CZBK.ItcastProject.WebApp._2015_6_2.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"> //實現檢查登錄用戶名是否存在 $(function () { //首先該元素不顯示 $("#msg").css("display", "none"); //當光標移除之后，獲取該元素的values值,並且判斷如果不等於null傳遞給以下一般處理程序處理 $("#txtUserName").blur(function () { var userName = $(this).val(); if (userName != "") { $.post("CheckUserName.ashx", { "name": userName }, function (data) { $("#msg").css("display", "block"); $("#msg").text(data); //賦值 }); } else { alert("用戶名不能為空!!"); } }); }); </script> </head> <body> <form id="form1" runat="server"> <div> 用戶名:<input type="text" name="txtName" id="txtUserName" /><span id="msg" style="font-size:14px;color:red"></span><br /> 密碼:<input type="password" name="txtPWD" /><br /> <input type="submit" value="注冊" /> </div> </form> </body> </html>
對應的一般處理程序代碼如下：
using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace CZBK.ItcastProject.WebApp._2015_6_2 { /// <summary> /// CheckUserName 的摘要說明 /// </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== "1231") { context.Response.Write("此用戶名已存在!!"); } else { context.Response.Write("此用戶名可用!!"); } } public bool IsReusable { get { return false; } } } }