ajax 实现无刷新验证用户名是否存在

来源：互联网发布：部落冲突武神升级数据编辑：程序博客网时间：2024/05/15 19:25
html代码：<%@ 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() {                var mytext = $('#txtname').val();                if (mytext == '') {                    $('#txtname').next().text('请填写用户名').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>后台代码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;        }    }}