xperseguers

# File EXT:your_ext/Configuration/Yaml/MyCustomActionBackend.yaml
TYPO3:
  CMS:
    Form:
      prototypes:
          # add our finisher to the 'standard' form prototype
          standard:
            formElementsDefinition:
              Form:
                formEditor:

manuelselbach

EXT:form How to add a custom form element

If you like to add a custom form element, please follow these steps. For detailed information and documentation of ext:form please visit the official documentation: https://docs.typo3.org/typo3cms/extensions/form/Index.html

Basics

First of all create a new extension, which will hold all the configuration, templates, etc.