username = $('#username').val();
password = $('#password').val();

$.post("./function/login_student.php", {
        username:username,
        password:password
    },
    function (data){
        var array = $.parseJSON(data);

        if(array.error == "1" || array.not_present == "1"){
            $('#alertLogin').addClass('alert-danger').text('Ti preghiamo di controllare i campi').show(0).delay(5000).hide(0);
        }
        else if(array.not_active == "1"){
            $('#alertLogin').addClass('alert-danger').text('Ti preghiamo di verificare il tuo account').show(0).delay(5000).hide(0);
        }
        else{
            let username_studente = array.username_studente;
            $(location).attr('href','student.php?username=' + username_studente);
        }
    }
);