Feature: #97230 - PSR-14 event for modifying image manipulation preview URL

See forge#97230


A new PSR-14 event \TYPO3\CMS\Backend\Form\Event\ModifyImageManipulationPreviewUrlEvent has been introduced which serves as a direct replacement for the now removed $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['Backend/Form/Element/ImageManipulationElement']['previewUrl'] hook.

It can be used to modify the preview URL within the image manipulation element, used e.g. for the crop field of the sys_file_reference table.

As soon as a preview URL is set, the image manipulation element will display a corresponding button in the footer of the modal window, next to the Cancel and Accept buttons. On click, the preview URL will be opened in a new window.


The element's crop variants will always be appended to the preview URL as JSON-encoded string, using the cropVariants parameter.

Next to the getPreviewUrl() and setPreviewUrl() the new PSR-14 event feature the following methods:

  • getDatabaseRow(): Returns the whole database row for the corresponding record

  • getFieldConfiguration(): Returns the processed field configuration

  • getFile(): Returns the resolved file object


Registration of the event in your extension's Services.yaml:

    - name: event.listener
      identifier: 'my-package/backend/modify-imagemanipulation-previewurl'

The corresponding event listener class:

use TYPO3\CMS\Backend\Form\Event\ModifyImageManipulationPreviewUrlEvent;

final class MyEventListener
    public function __invoke(ModifyImageManipulationPreviewUrlEvent $event): void


It's now possible to modify the preview URL for the image manipulation element, using the new PSR-14 event ModifyImageManipulationPreviewUrlEvent.