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asp.net ajax no refresh authentication username

Source: Internet
Author: User
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Extremely simple, self expanding

HTML code

<%@ 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" >
<title>untitled page</title>
<script type= "Text/javascript" >
function GetUser ()
{
Requestsimpleservice = Webservicesample.getuser (document.getElementById (' UserName '). value, Onrequestcomplete);
return false;
}
Show Tips
function Onrequestcomplete (Result)
{
if (result = = ' true ')
{
document.getElementById (' message '). InnerHTML = ' Hint: User name has been registered. '
document.getElementById (' Postbutton '). Disabled = ' disabled ';
}
Else
{
document.getElementById (' message '). InnerHTML = ' Hint: User name can use. '
document.getElementById (' Postbutton '). Disabled = ";
}
}
</script>
<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= "register" disabled= "disabled"/><br/>
<div id= "Message" ></div>
</form>
</body>

WebService code

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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