Method onAttachCallback

/**
 * Method called when asset attached to the Document.
 * Useful for Asset to add a Script options.
 *
 * @param   Document  $doc  Active document
 *
 * @return void
 *
 * @since   4.0.0
 */
public function onAttachCallback(Document $doc)
{
    // Add validate.js language strings
    Text::script('JLIB_FORM_CONTAINS_INVALID_FIELDS');
    Text::script('JLIB_FORM_FIELD_REQUIRED_VALUE');
    Text::script('JLIB_FORM_FIELD_REQUIRED_CHECK');
    Text::script('JLIB_FORM_FIELD_INVALID_VALUE');
}