<script type="text/javascript" data-author="Tony Partner">  
  $(document).on('ready pjax:scriptcomplete',function(){
 
    // Identify the questions
    var qID = '{QID}';
    var thisQuestion = $('#question'+qID);
    var textQuestion = thisQuestion.nextAll('.text-short:eq(0)');
    var nextMultiOpt = thisQuestion.nextAll('.multiple-opt:eq(0)');
    var nMOID = nextMultiOpt.attr('id').replace(/question/, '');
 
    // Identify the sub-question codes to target
    var sqCodes = [4, 5, 9];
 
    // Listener on the checkboxes
    $(':checkbox', thisQuestion).on('change', function(e) {
      // Reset the hidden questions
      $(':text', textQuestion).val('');
      $(':checkbox', nextMultiOpt).prop('checked', false).trigger('change');
 
      // Build an array of checked codes (use all if none are checked)
      var checkedCodes = [];
      $.each(sqCodes, function(i, val) {
        if($(':checkbox[id$="X'+qID+val+'"]').is(':checked')) {
          checkedCodes.push(val);
        }
      });
      var randomCodes = sqCodes;
      if(checkedCodes.length > 0) {
        randomCodes = checkedCodes;
      }
      // Randomize the codes
      shuffleArray(randomCodes);
 
      // Load the hidden questions
      var selectedCode = randomCodes[0];
      $(':text', textQuestion).val(selectedCode);
      $(':checkbox[id$="X'+nMOID+selectedCode+'"]', nextMultiOpt).prop('checked', true).trigger('change');
    });  
  });
 
  function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
      var j = Math.floor(Math.random() * (i + 1));
      var temp = array[i];
      array[i] = array[j];
      array[j] = temp;
    }
    return array;
  }
</script>