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Drupal 9 Form API custom Textfield element, different $form_state value and element ‘#value’ value

I have a textfield element (named ‘bus_station’), which holds a bus station name. Is there a way to create a custom ‘bus_station’ element (extending Textfield class), which would:

  • Still expect a text input in form of bus station name (and retain it during $form_state->setRebuild()), but
  • In $form_value, after form submit, either provide a FALSE (some custom code in Element definition doesn’t recognize input as a station) or TRUE (it does recognize a station)?

In a nutshell – different value in '#value' of Textfield array and different value in $form_state values after submit?

Thank you very much!

This article was republished from its original source.
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Drupal 9 Form API custom Textfield element, different $form_state value and element ‘#value’ value

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