Summary of Changes

Currently, the onAfterDisplay event via Joomla\CMS\Event\View\DisplayEvent doesn't allow to modify the view output, but it's logical that we should be able to modify the output.

The patch allows 3rd-party plugins to modify the view output by changing the source argument.

Testing Instructions

Try to change smth via onAfterDisplay event.

Actual result BEFORE applying this Pull Request

You can't modify the view output before it's optionally stored to view cache. You can only use onAfterDispatch event and modify the component document buffer but this event forces the execution of custom code even if the cached output is displayed and results into extra costs.

Expected result AFTER applying this Pull Request

You can easily modify the view output: add your handler into any system plugin which implements SubscriberInterface:

    public static function getSubscribedEvents(): array
    {
        return [
            ...
            'onAfterDisplay' => 'onAfterDisplay',
        ];
    }

    public function onAfterDisplay(\Joomla\CMS\Event\View\DisplayEvent $e)
    {
        $e->setArgument('source', '<h1>Hello from onAfterDisplay!</h1>' . $e->getArgument('source'));
    }

Now we can modify the view output and add custom scripts which will next be optionally cached in view cache.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed