MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
mw.hook('wikipage.content').add(function ($content) {
  // Only inject if the page actually has commentary blocks
  if (!$content.find('.commentary-block').length) return;

  var hidden = mw.cookie.get('commentaryHidden') === '1';
  if (hidden) $('body').addClass('hide-commentary');

  var $btn = $('<button>')
    .addClass('commentary-toggle-btn')
    .text(hidden ? 'Show Commentary' : 'Hide Commentary')
    .on('click', function () {
      var nowHidden = $('body').toggleClass('hide-commentary')
                               .hasClass('hide-commentary');
      $(this).text(nowHidden ? 'Show Commentary' : 'Hide Commentary');
      mw.cookie.set('commentaryHidden', nowHidden ? '1' : '0', { expires: 90 });
    });

  $content.prepend($btn);
});