Solution:
HTML file :
<html>
<head>
<script>
function getans()
{
st1=document.getElementById('txtname').value;
st2=document.getElementById('txtpass').value;
ob=new XMLHttpRequest();
ob.onreadystatechange=function()
{
if(ob.readyState==4 && ob.status==200)
{
if(ob.responseText==3)
{
alert("sorry you lost the chances to login");
location="error.html";
}
else if(ob.responseText=="correct")
{
alert("you entered correct details");
}
else alert(ob.responseText);
}
}
ob.open("GET","slip8_Q2.php?n="+st1+"&p="+st2);
ob.send();
}
</script>
</head>
<body>
<input type=text id=txtname placeholder="username"></br>
<input type=password id=txtpass placeholder="password"></br>
<input type="button" onclick="getans()" value="Login">
</body>
</html>
HTML file : error.html
<html>
<body>
<h1>YOu lossed the chances of login</h1>
</body>
</html>
PHP file :
<?php
session_start();
$nm=$_GET['n'];
$ps=$_GET['p'];
if($nm==$ps)
{
echo "correct";
}
else if(isset($_SESSION['cnt']))
{
$x=$_SESSION['cnt'];
$x=$x+1;
$_SESSION['cnt']=$x;
echo $_SESSION['cnt'];
if($_SESSION['cnt']>=3)
$_SESSION['cnt']=1;
}
else
{
$_SESSION['cnt']=1;
echo "1";
}
?>
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