ASP.NET AJAX无刷新验证用户名

  HTML代码    <%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” %>
    <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN” “http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd“>
    <html xmlns=”http://www.w3.org/1999/xhtml“>
    <head runat=”server”>
    <title>Untitled Page</title>
    <script type=”text/javascript”>
    function GetUser()
    {
    requestSimpleService = WebServiceSample.GetUser(document.getElementById(’UserName’)。value, OnRequestComplete);
    return false;
    }
    //显示提示信息
    function OnRequestComplete(result)
    {
    if(result == ‘true’)
    {
    document.getElementById(’Message’)。innerHTML = ‘提示:用户名已被注册。’;
    document.getElementById(’PostButton’)。disabled = ‘disabled’;
    }
    else
    {
    document.getElementById(’Message’)。innerHTML = ‘提示:用户名可以使用。’;
    document.getElementById(’PostButton’)。disabled = ”;
    }
    }
    </script>
    </head>
    <body>
    <form id=”form1″ runat=”server”>
    <asp:ScriptManager ID=”ScriptManager1″ runat=”server”>
    <Services>
    <asp:ServiceReference Path=”WebServiceSample.asmx” />
    </Services>
    </asp:ScriptManager>
    <input id=”UserName” type=”text” onblur=”return GetUser()” />
    <input id=”PostButton” type=”button” value=”注 册” disabled=”disabled” /><br />
    <div id=”Message”></div>
    </form>
    </body>
    </html>
    WebService代码
    using System;
    using System.Web;
    using System.Collections;
    using System.Web.Services;
    using System.Web.Services.Protocols;
    using System.Web.Script.Services;
    /// <summary>
    /// WebServiceSample 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ScriptService]
    public class WebServiceSample : System.Web.Services.WebService
    {
    public WebServiceSample () {
    //如果使用设计的组件,请取消注释以下行
    //InitializeComponent();
    }
    [WebMethod]
    public string GetUser(string strUser)
    {
    string strMessage = null;
    if (strUser == “ADMIN”)
    {
    strMessage = “true”;
    }
    else
    {
    strMessage = “false”;
    }
    return strMessage;
    }
    }

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