Intialization of table with aaData inside of a function

Mauro26

I'm stuck with this.
I have an ajax call that returns me a json, in the succes method i have a call to initializate a table with that json parameters, the table fills and everything is ok, but if the event is fired again, then i have a problem.

here is the code:

 $('#fileAdd').change(function() {
     debugger;
       var fileAdd =  document.getElementById("fileAdd").files[0].name;

        $.ajax({
            url : 'ajax/getAumento.action',
            data : { "fileAdd" : fileAdd},
            type : 'GET',
            dataType : 'json',
            success : function(json) {
                debugger;
                makeTables(json);
            },
            error : function(json) {
                   alert('error');
                    }

     });

    });

 function makeTables(data){

    // t.destroy();
     debugger;
     if ( $.fn.dataTable.isDataTable( '#aumentoTable' ) ) {


         //t.fnReloadAjax();
        } else {
             t = $('#aumentoTable').DataTable( {
            "aaData": data.itemsAumento,
            "jQueryUI": true,
            "dom": '<"search"f><"toolbar">tlp',
            "buttons": true,
                aoColumns: [ {"data" : "nombre",
                                "width" : "18%"}, 
                               {"data" : "costo"
                   }], 
        });

        }

if the table doesn't exists then i initilizate the table, the problem is when the table is already initialize and i have to reload it, with the parameter (Data) with aaData, anybody knows how can i do this? or if this posible.

pd: t.fnReloadAjax(); give an error cause of T is undefined

Regards