Question

I have to process a Simple log-in File. In Many Web Tutorials I have read that for any Ajax requests in jquery the callback function is function(data) and the data is returned by the server side script.

Well, my server side script is PHP. I wish to know how can I return data from PHP which will be stored in jquery’s data and I can use conditional loops to process them.

Here is my jquery Code:

$('#loginform').submit( function() {
        var querystring = $(this).serialize();
        $.post('login.php', querystring, processLI );
        function processLI(data) {
            if (data == 'success'){
            alert("Successful");
            var url = "game.php";    
            $(location).attr('href',url);
            }
            else 
                alert ('Login Failed');
        }

I am using simple return statement in my php file, which does not seem to work at all. here is the login.php file. I just posted the part necessary here.

$statement = $connection->prepare("SELECT * FROM users WHERE username = '$username'");
    $statement->execute(array());
    $result = $statement->fetch(PDO::FETCH_ASSOC);

    if ($result['password'] == $safepass) {
        setcookie("Login", true);
        echo 'success';

    }
    else 
        echo "Failure";

Answer 1

Use the echo statement to output data, if the login is successful echo 'success';