<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}')
 
    // Add some classes to the answer cells
    $('td.question-item', thisQuestion).addClass('normal-opt');
    $('tr.subquestions-list', thisQuestion).each(function(i) {
        $('.normal-opt:last', this).removeClass('normal-opt').addClass('exlusive-opt')
    });
 
    // Insert the checkboxes
    $('.exlusive-opt input[type="text"]', thisQuestion).hide();
    $('.exlusive-opt', thisQuestion).append('<input type="checkbox" class="checkbox">');
 
    // A listener on the text inputs
    $('.normal-opt input[type="text"]', thisQuestion).on('keyup change paste', function() {
      var thisInput = $(this);
      var thisRow = $(this).closest('tr.subquestions-list');
      setTimeout(function() {
        if(thisInput.val() != ''){
          $('.exlusive-opt input[type=checkbox]', thisRow).prop('checked', false);
          $('.exlusive-opt input[type=text]', thisRow).val('');
        }
      }, 100);
    });  
 
    // A listener on the checkboxes
    $('.exlusive-opt input[type="checkbox"]', thisQuestion).change(function(event) {
      var thisCell = $(this).closest('td.question-item');
      var thisRow = $(this).closest('tr.subquestions-list');
      if($(this).is(':checked')) {
        $('input[type=text]', thisCell).val(1);
        $('.normal-opt input[type=text]', thisRow).val('');
      }
      else {
        $('input[type=text]', thisCell).val('');
      }
    });
 
    // Initial states
    $('.exlusive-opt input[type="text"]', thisQuestion).each(function(i) {
      var thisCell = $(this).closest('td.question-item');
      if($(this).val() != '') {
        $('input[type=checkbox]', thisCell).prop('checked', true);        
      }
    });
  });
</script>