一、介紹一下Ajax在Asp.Net中的基本使用
1、在工程中引入Ajax.dll檔案。
Ajax.dll實現XmlHttpRequest請求伺服器的實現細節。.net項目中，添加上對其的引用，就可以進
行相應封裝操作了。
2、在web.config中設定HttpHandle
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax"/>
</httpHandlers>
3、在 <HEAD>與</HEAD>間加入一些引用如下：
<script src=js/Xml.js></script>
<link href="css/myStyle.css" type="text/css" rel="stylesheet">
<script src="/HttpForAjax/ajax/common.ashx" type="text/javascript"></script>
<script src="/HttpForAjax/ajax/Ttyu.AjaxData,HttpForAjax.ashx" type="text/javascript"></script>
二、介紹正題-使用者登入驗證
1、前台Html：
<form id="Form1" method="post" runat="server" action="" onsubmit="login.GetLogin();return false;">
<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="300" border="1">
<TR>
<TD></TD>
<TD><INPUT type="text" id="txtUsername">usename</TD>
</TR>
<TR>
<TD></TD>
<TD><INPUT type="password" id="txtPassword">pwd</TD>
</TR>
<TR>
<TD></TD>
<TD><INPUT type="submit" value="登陸"></TD>
</TR>
</TABLE>
</form>
2、引用Js檔案
<SCRIPT language="javascript" src="login.js" type="text/javascript"></SCRIPT>
<script language="javascript">
window.onload = function()
{
login=new Login(testAjax);
}
</script>
login.Js檔案
// 提取控制項值
function getValueById(pObjID){
var obj=document.getElementById(pObjID);
try{
return obj.value;
}catch(e){
alert("控制項："+pObjID+" 不存在，或沒有value屬性");
}
}
function Login(obj)
{
this.OBJ = obj;
this.GetLogin=function()
{
var returnValue;
var username=getValueById('txtUsername');
var password=getValueById('txtPassword');
if(!username||!password)
{
alert('請輸入使用者名稱與密碼！');
return;
}
try
{
returnValue=this.OBJ.Login(username,password).value;
}catch(e)
{
alert('登入出錯，請稍後再試或與管理員聯絡');
}
switch(returnValue)
{
case 1:
alert('對不起，您輸入的使用者名稱或密碼不正確或者不是管理員！');
break;
case 0:
alert('管理員登入成功！');
window.document.location.href('../Error.aspx');
break;
default:
alert('登入失敗，請稍後再試或與管理員聯絡'+returnValue);
break;
}
}
}
3、.cs檔案
private void Page_Load(object sender, System.EventArgs e)
{
Ajax.Utility.RegisterTypeForAjax(typeof(testAjax));
}
[Ajax.AjaxMethod()]
public int Login(string username,string password)
{
// 管理員登陸入口
Action.Common.CDB cdb = new Action.Common.CDB();
if("admin"==cdb.ExeScalar("select upower from users where
uname='"+username+"' and upwd='"+password+"'"))
return 0;
else
return 1;
}
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