Method getLayoutData

/**
 * Method to get the data to be passed to the layout for rendering.
 *
 * @return  array
 *
 * @since 3.7.0
 */
protected function getLayoutData()
{
    $data = parent::getLayoutData();
    // Initialize some field attributes.
    $maxLength = !empty($this->maxLength) ? ' maxlength="' . $this->maxLength . '"' : '';
    $extraData = array('maxLength' => $maxLength);
    return array_merge($data, $extraData);
}