Reply To: Required field based on input other fields

• k-Dushi

• March 2, 2019 at 2:22 am

I just fiddled with it a bit and I think this should be it?

add_filter('acf/validate_value/key=field_5c66e017f8359', 'custom_validate_title', 20, 4);
function custom_validate_title($valid, $value, $field, $input) {
  // title is required if other fields has a value
  if (!empty($_POST['acf']['field_5c6d43781bcb1']));
  if (!empty($_POST['acf']['field_5c66e094f835a'])); 
  if (!empty($_POST['acf']['field_5c66e0d4f835b'])); 
  if (!empty($_POST['acf']['field_5c66e130f835c'])); 
  if (!empty($_POST['acf']['field_5c703c1fd5851'])); {
    // the other fields has a value
    // check value of this field;
    if (empty($value)) {
      $valid = 'This field is required because you have added a value to some other field';
    }
  }
  return $valid;
}