Method getLayoutData

/**
 * Method to get the data to be passed to the layout for rendering.
 *
 * @return  array
 *
 * @since 3.5
 */
protected function getLayoutData()
{
    $data = parent::getLayoutData();
    $extraData = array('maxLength' => $this->maxLength, 'multiple' => $this->multiple);
    return array_merge($data, $extraData);
}