<script type="text/javascript" charset="utf-8">
    
    var numberToShow = 3;
    
    $(document).on('ready', function(){      
        if($('#question{QID} input:checkbox:checked').length == 0) {
            $('#question{QID} input:checkbox:lt('+numberToShow+')').each(function(i) {
                $(this).nextAll('input:hidden').val('Y');
                $(this).prop('checked', true).trigger('change');
            }); 
        }
    });
</script>

<script type="text/javascript" charset="utf-8">
 
function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;
 
  // While there remain elements to shuffle...
  while (0 !== currentIndex) {
 
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;
 
    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }
 
  return array;
}
 
 
    $(document).on('ready pjax:scriptcomplete',function(){
// Fill the arrays
      var arr1 = [11,12,13,14,15,16,17,18];
      var arr2 = [21,22,23,24,25,26,27,28];
      var arr3 = [31,32,33,34,35,36,37,38];
      var arr4 = [41,42,43,44,45,46,47,48];
 
      arr1 = shuffle(arr1);
      arr2 = shuffle(arr2);
      arr3 = shuffle(arr3);
      arr4 = shuffle(arr4);
      arr1 = arr1.slice(0,3).join(',');
      arr2 = arr2.slice(0,3).join(',');
      arr3 = arr3.slice(0,3).join(',');
      arr4 = arr4.slice(0,3).join(',');
      $('#question{QID} input[type="text"]').val("#,"+arr1+","+arr2+","+arr3+","+arr4);
      $('#question{QID}').hide();
   });
</script>