Is there a way to add Javascript to the Joomla Administrator template without creating a child template?

Something equivalent to /media/templates/administrator/atum/css/user.css for Javascript.

2 Answers 2


You could create a system plugin that only works in the back-end and loads some JavaScript file.

Probably with something like:

defined('_JEXEC') or die;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Plugin\CMSPlugin;

class PlgSystemPluginname extends CMSPlugin

  protected $app;

  public function onAfterRender()
    // Quit this when the app is not in the administrator back-end
    if (!$this->app->isClient('administrator'))

    // Load some JavaScript file
    ['version' => 'auto', 'relative' => true]);

bug open at https://issues.joomla.org/tracker/joomla-cms/43320

Meanwhile, you may add your javascript in the /media/templates/administrator/atum/js/template.min.js

I will update here if it is solved

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