// POST data to server
   $(document).ready( function() {
     $('#example').dataTable( {
       "bProcessing": true,
       "bServerSide": true,
       "sAjaxSource": "xhr.php",
       "fnServerData": function ( sSource, aoData, fnCallback, oSettings ) {
         oSettings.jqXHR = $.ajax( {
           "dataType": 'json', 
           "type": "POST", 
           "url": sSource, 
           "data": aoData, 
           "success": fnCallback
         } );
       }
     } );
   } );