AJAX request with Bacon.js

gistfile1.js

    $('#authenticateCont form')
        .asEventStream('submit')
        .map(function(e) {
            e.preventDefault();
            return $(e.target);
        })
        .filter(function(form) {
            return form.valid();
        })
        .flatMapLatest(function(form) {

            $('#authenticateCont :submit')
                .attr('disabled', 'disabled')
                .val('REALLY BUSY');

            $('#lblResponse').hide();

            return Bacon.fromPromise($.post(
                form.attr('action') + '?r=' + Math.random(),
                form.serializeArray()));
        })
        .onValue(function(r) {

            if (r.userId === 0) {
                $('#authenticateCont :submit').removeAttr('disabled').val('LET\'S DO THIS');
                $('#lblResponse').html('Sorry, please try again.').show();
            } else {
                location.reload();
            }
        });