..  include:: /Includes.rst.txt
implementationClassName
-----------------------

:aspect:`Option path`
    prototypes.<prototypeIdentifier>.formElementsDefinition.ImageUpload.implementationClassName

:aspect:`Data type`
    string

:aspect:`Needed by`
    Frontend/ Backend (form editor)

:aspect:`Overwritable within form definition`
    No

:aspect:`form editor can write this property into the form definition (for prototype 'standard')`
    No

:aspect:`Mandatory`
    Yes

:aspect:`Default value (for prototype 'standard')`
    ..  code-block:: yaml
        :linenos:
        :emphasize-lines: 2

        ImageUpload:
          implementationClassName: TYPO3\CMS\Form\Domain\Model\FormElements\FileUpload

..  :aspect:`Good to know`
    ToDo

:aspect:`Description`
    Classname which implements the form element.
