Conditional Required field

Hi,
thanks for the 5-star review :).

If you will be having problem with the customization, please post the code snippet you are working on i should be able to help you with that.

Creating a custom is_required validator which would be conditional based on the value selected in the dropdown seems like a good solution.

One other approach you can try is making all fields optional and in adverts_form_load checking the submitted value and if needed making the fields required.

It would be something like this

add_filter( "adverts_form_load", function( $form ) {
  if( $form["name"] != "advert" ) {
    return $form;
  }
  if( $_POST['select-to-check'] != 'make-fields-required' ) {
    // leave the fields as optional
    return $form;
  }
  $make_required = array( "field_1", "field_2" );
  foreach( $form["field"] as $k => $field ) {
    if( in_array( $field["name"], $make_required" ) ) {
      $form["field"][$k]["is_required"] = true;
      $form["field"][$k]["validator"][] = array( "name" => "is_required" );
    }
  }
  return $form;
} );

Where ‘select-to-check’ is actual name of dropdown and ‘make-fields-required’ is actual value which makes fields named “field_1”, “field_2” required, so you would need to adjust the values to your needs.