MediaWiki:Gadget-CategorySorter.js

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// Category alphabetical sorter (Adapted from Fandom)
(function(){
  if (window.mediaWikiCategorySorterLoaded) return;
  window.mediaWikiCategorySorterLoaded = true;

  function sorter(a, b) {
    return (a.textContent || '').localeCompare(b.textContent || '');
  }

  $(function() {
    $('#catlinks .mw-normal-catlinks, #catlinks .mw-hidden-catlinks').each(function() {
      var $list  = $(this).find('ul'),
          $items = $list.children('li'),
          sorted = $items.sort(sorter);

      $list.empty().append(sorted);
    });
  });
})();