AJAX无刷验证用户是否已经存在
来源：互联网 发布：淘宝骂人怎么投诉他 编辑：程序博客网 时间：2024/04/30 07:13
前台页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="username.aspx.cs" Inherits="username" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="js/Jquery1.7.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { $('#txtname').blur(function () { vailtname(); }) function vailtname() { //验证用户名不能为空 var mytext = $('#txtname').val(); if (mytext == '') { $('#txtname').next().text('用户名不能为空').css('color', 'red'); return false; } else { WebService.vilatename(mytext, onSuccess1, onFailed1); } } function onSuccess1(result) { if (result == true) { $('span').text(''); var img = "<img src=images/kws_safe.gif/>"; $('span').append(img); return true; } else { $('span').text('用户名已存在').css('color', 'red'); return false; } } function onFailed1() { alert('方法调用失败'); } $('#btnOk').bind("click", function () { }) }) </script> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="~/WebService.asmx"/> </Services> </asp:ScriptManager> <div> <input id="txtname" type="text" /> <span></span><br /> <input id="btnOk" type="button" value="确定" /> </div> </form> </body> </html> 后台：WebService1.asmx
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; using System.Configuration; using System.Data.SqlClient; /// <summary> ///WebService 的摘要说明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] //若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。 [System.Web.Script.Services.ScriptService] public class WebService : System.Web.Services.WebService { public WebService () { //如果使用设计的组件，请取消注释以下行 //InitializeComponent(); } private string sqlcnn = ConfigurationManager.ConnectionStrings["sqlcnn"].ConnectionString; [WebMethod] public string HelloWorld() { return "Hello World"; } [WebMethod] public bool vilatename(string name) { object getvalue = null; using (SqlConnection con = new SqlConnection(sqlcnn)) { using (SqlCommand com = con.CreateCommand()) { com.CommandText = "select UserName from UserInfo where UserName=@name"; com.Parameters.AddWithValue("@name",name); con.Open(); getvalue = com.ExecuteScalar(); } } if (getvalue != null) { return false; } else { return true; } } }
