如何显示var的数据？

I am not really good in jquery/ajax. How do I save the value of var message into the database? Because what im trying to do is to save files into the database which is working but the message doesn't show. I think the problem is that there's no data to fetch in my message but I don't know how to do that..

$('.submit').click(function(){
    var name = '<?php echo $row['name'];?>';
    var message = $('.message').val();
    if (message.length>1) {
        $.ajax({
            url:'answer.php?id=<?php echo $id;?>',
            data: new FormData($('.form')[0]),
            type:'post',
            cache: false,
            contentType: false,
            processData: false, 
            success:function(){
                $('.message').val('');
                listComments();
                alert('Post Message');
            }
        })
    } else { 
        alert('PLEASE DO RIGHT A MESSAGE BEFORE SENDING'); 
    }
});