get_field_setting( $field_id, 'field_class' ); $field_class .= ' '.$calc_listen; $ninja_forms_loading->update_field_setting( $field_id, 'field_class', $field_class ); } else { $field_class = $ninja_forms_processing->get_field_setting( $field_id, 'field_class' ); $field_class .= ' '.$calc_listen; $ninja_forms_processing->update_field_setting( $field_id, 'field_class', $field_class ); } } } add_action( 'ninja_forms_display_init', 'ninja_forms_calc_listen_field_class' );