orbit-basic/app/assets/javascripts/ajax_form.js

$(document).on('click', '#ajax_form_submit', function(){
	$('#ajaxForm').ajaxSubmit({
		beforeSubmit: function(a,f,o) {
			o.dataType = 'script';
			if (o.dataType == 'script') {
        o.url = o.url.split('?'); // split on GET params
        if (o.url[0].substr(-3) != '.js') o.url[0] += '.js'; // force rails to respond to respond to the request with :format = js
        o.url = o.url.join('?'); // join on GET params
        alert(o.url)
      }
		}
	});
});