Feature: #107528 - PSR-14 event before renderable is removed from form 

Description 

A new PSR-14 event \TYPO3\CMS\Form\Event\BeforeRenderableIsRemovedFromFormEvent has been introduced. It serves as an improved replacement for the now removed hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['beforeRemoveFromParentRenderable'] .

The new event is dispatched immediately before a renderable is deleted from the form.

The event provides the following public properties:

• $renderable: The form element (read-only).
• $preventRemoval: A boolean flag that can be set to true to prevent the removal of the renderable.

The event is stoppable. As soon as $preventRemoval is set to true, no further listeners are executed.

Example 

An example event listener could look like this:

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Form\Event\BeforeRenderableIsRemovedFromFormEvent;

class MyEventListener {

    #[AsEventListener(
        identifier: 'my-extension/before-renderable-is-removed-from-form-event',
    )]
    public function __invoke(BeforeRenderableIsRemovedFromFormEvent $event): void
    {
        $event->preventRemoval = true;
        $renderable = $event->renderable;
        // Custom logic before the renderable is removed
    }
}

Impact 

With the new BeforeRenderableIsRemovedFromFormEvent , it is now possible to prevent the deletion of a renderable and to add custom logic based on the deletion.