gistfile1.txt

<!-- need one for each toplevel nav item. search the demo -->
<i data-js="nav-dropdown-trigger" class="icon-caret-down nav-dropdown-trigger"></i>

<!-- one of these -->
<i data-js="nav-trigger" class="icon-reorder nav-trigger"></i>

<!-- put into js -->
<script>
  $(document).ready(function() {

  /* Mobile navigation dropdown */
  $('i[data-js="nav-trigger"]').click(function() {
    $(this).toggleClass('active');
    $('.navPrimary').toggleClass('open');
    $('.navPrimary-list-item').removeClass('open');
  });
  $('i[data-js="nav-dropdown-trigger"]').click(function() {
    if ($(this).parent('.navPrimary-list-item').hasClass('open')) {
      $('.navPrimary-list-item').removeClass('open');
    } else {
      $('.navPrimary-list-item').removeClass('open');
      $(this).parent().addClass('open');
    }
  });
});
</script>