jQuery AJAX file upload with POST form data

Question

I am sending form data via an ajax request using jQuery's $.ajax..

It sends some input fields, etc. I also have a file upload button that I need to have function with the jQuery.

How can I do this simultaneously while sending the POST data from the form?

I have found questions answered that explain how to do an AJAX file upload but ONLY that. I need to do the AJAX file upload WHILE submitting POST data from a form filled out...

$('#gobutton').click(function(e) {
    e.preventDefault();

    var payment_type = $('.change').val();
    var terms = 0;

    if($('#terms').is(':checked'))
        terms = 1;

    $.ajax({
        url: 'code2.php',
        type: 'POST',
        data: { gobutton: 'Update', 
                terms: terms,
                file: file
         },
         success: function(result) {
            $('#feedback').html(result);
         }
    });
});