jquery fullcalendar send custom parameter and refresh calendar with JSON

Question

im trying to use the jquery fullcalendar. The event data comes from the server using JSON. My page has a dropdown element and the fullcalendar div.

What i need is to

Answer 1

I solved like this

         data: function() { // a function that returns an object
         return {
                 custom_param1: date_start,
             custom_param2: date_end
            };
         },

after modifying the values date_start and date_end, this function gets the new values. In my case i take the dates when the view changes

viewRender: function(view,element){
       date_start = $.fullCalendar.formatDate(view.start,'dd/MM/yyyy');
       date_end   = $.fullCalendar.formatDate(view.end,'dd/MM/yyyy');
},