MediaWiki:Common.js

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/**
 * Adds CSS classes to the body tag based on the categories this page belongs to
 *
 * @source https://www.mediawiki.org/wiki/Snippets/Style_pages_based_on_categories
 * @revision 2016-01-18
 */
(function($, mw) {
  var fn = function() {
    var cats = mw.config.get('wgCategories'), newClasses;
    if (cats) {
      newClasses = $.map(cats, function(el) {
        return 'cat-' + encodeURIComponent(el.replace(/[ .]/g, '_')).replace(/%/g, '_');
      }).join(' ');
      $(document.body).addClass(newClasses);
    }
  };
  if (document.body) {
    fn();
  } else {
    $(fn);
  }
})(jQuery, mw);