<script type="text/javascript" charset="utf-8">
  $(document).on('ready pjax:scriptcomplete',function(){
 
    // Identify the questions
    var q1ID = {QID};
    var q1 = $('#question'+q1ID);
    var q2ID = $(q1).nextAll('.array-flexible-row:eq(0)').attr('id').replace(/question/, '');
    var q2 = $('#question'+q2ID);
    var q3ID = $(q1).nextAll('.array-flexible-row:eq(1)').attr('id').replace(/question/, '');
    var q3 = $('#question'+q3ID);
    var arrays = $(q1).add(q2).add(q3);
 
    // Assign column-specific classes
    $('table.subquestion-list tr', arrays).each(function(i) { 
      $('> *:gt(0)', this).each(function(i){
        $(this).addClass('column-'+(i+1));
      });
    });
 
    // Default answers in Q1 
    $('table.subquestion-list tr.answers-list', q1).each(function(i) { 
      if($('input[type="radio"]:checked', this).length == 0) {
        $('input[type="radio"]:first', this).trigger('click');
      }
    });
 
    // Listener on the Q1 radios 
    $('input[type="radio"]', q1).on('click', function(i) {
      handleRadios(this);
    }); 
    $('input[type="radio"]', q2).on('click', function(i) {
      handleRadios(this);
    });
 
    function handleRadios(el) {
      var thisQID = $(el).closest('.array-flexible-row').attr('id').replace(/question/, '');
      var nextQID = $(el).closest('.array-flexible-row').nextAll('.array-flexible-row:eq(0)').attr('id').replace(/question/, '');
      var thisSQCode = $(el).attr('name').split('X'+thisQID)[1];
      var thisQCode = $(el).val();
      var nextCol1Radio = $('tr[id$="X'+nextQID+thisSQCode+'"] .column-1 input[type="radio"]');
      var nextThisRadio = $('tr[id$="X'+nextQID+thisSQCode+'"] input[type="radio"][value="'+thisQCode+'"]');
      if(!$(el).closest('td').hasClass('column-1')) {
        // Disable column-1 in the next question
        $(nextCol1Radio).prop('checked', false).prop('disabled', true);
        // Trigger the corresponding radio in the next question
        $(nextThisRadio).trigger('click');
      }
      else {
        // Enable column-1 in the next question
        $(nextCol1Radio).prop('disabled', false);
      }
    }
  });
</script>