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If I have a multiple field (ajax) required: FIELD_A (N), and I want it not required if: FIELD_B has a certain value. How can I do ? Any function in $ form_state?

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Use states to style the input as required. This won't actually perform any validation but will add the required asterisk to the field when field B has a certain value.

$form['FIELD_A']['#states'] = [
  'required' => array(
    ':input[name="FIELD_B"]' => array('value' => 'foo'),
  ),
];

Then use custom validation to actually check FIELD_A has the correct value depending on the value of FIELD_B.

  • ! Ok thz. It did not work due to a bug on a contrib field, then ok. – BOES Nov 28 '17 at 12:23

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