Ajax Login

DrRakha

When a user input username and password and press Login button, 'call_login()' function is called. This method sends ajax request to server (login.php) to validate the user. We have hardcoded the authonication mechanism e.g. if you enter login name admin and password admin then the program will show you success message. Otherwise it will show login failed message. You can change the authentication logic in the page and easily authenticate use from database.

Code:

<html>
<head>
<script language="javascript">
function postRequest(strURL){
var xmlHttp;
if(window.XMLHttpRequest){ // For Mozilla, Safari, ...
var xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){ // For Internet Explorer
var xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.open('POST', strURL, true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttp.onreadystatechange = function(){
if (xmlHttp.readyState == 4){
updatepage(xmlHttp.responseText);
}
}
xmlHttp.send(strURL);
}

function updatepage(str){
if(str=="yes"){
alert("Welcome User");
}else{
alert("Invalid Login! Please try again!");
}
}

function call_login(){
var username = window.document.f1.username.value;
var password = window.document.f1.password.value;
var url = "login.php?username=" + username + "&password=" +password ;
postRequest(url);
} 
</script>
</head>

<body>
<Center>

<form name="f1" onsubmit="return call_login();">
<table border="0" bgcolor="#CCCCFF" cellspacing="1" cellpadding="3" width="287">
<tr>
<td align="left" colspan="2" width="275"><b><font size="5" color="#000080">Login</font></b></td>
</tr>
<tr>
<td align="right" width="81"><b><font color="#000080">User
Name:</font></b></td>
<td width="184"><input type="text" name="username" id="user" size="20" value="" /></td>
</tr>
<tr>
<td align="right" width="81"><b><font color="#000080">Password:</font></b></td>
<td width="184"><input type="password" name="password" size="20" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center" width="275"><input type="button" name="a1" value="Login" onclick="call_login()"></td>
</tr>
</table>
</form>

</center>
</body>
</html>

code for login.php page

Code:

<?
$username=$_GET["username"];
$password=$_GET["password"];
if($username=="admin" && $password=="admin"){
echo "yes";
}else{
echo "No";
}
?>

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