Joomla form behavior for Select2 4.0

<?php
// see also: http://pastebin.com/ih2gLVg2 for joomla form example usage
/**
 * @package     Joomla.Libraries
* @subpackage  HTML
*
* @copyright   Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license     GNU General Public License version 2 or later; see LICENSE
*/

defined('JPATH_PLATFORM') or die;

// place this file in /libraries/cms/html/formbehaviourselect2.php

/**
 * Utility class for form related behaviors
 *
 * @package     Joomla.Libraries
 * @subpackage  HTML
 * @since       3.0
 */
abstract class JHtmlFormbehaviourselect2
{
    /**
     * @var    array  Array containing information for loaded files
     * @since  3.0
     */
    protected static $loaded = array();

    /**
     * Method to load the Select2 JavaScript framework and supporting CSS into the document head
     *
     * @param   string  $selector  Class for Chosen elements. [optional]
     * @param   string  $option    options for Select2 elements. [optional]
     * @param   mixed   $debug     Is debugging mode on? [optional]
     *
     * @return  void
     *
     * @since   3.0
    */
    public static function select2($selector = '.advancedSelect', $option = '', $debug = null)
    {
        if (isset(static::$loaded[__METHOD__][$selector]))
        {
            return;
        }

        // Include jQuery
        JHtml::_('jquery.framework');

        // If no debugging value is set, use the configuration setting
        if ($debug === null)
        {
            $config = JFactory::getConfig();
            $debug  = (boolean) $config->get('debug');
        }

        $http = JHtmlFormbehaviourselect2::isSecure() ? 'https' :'http';
        //JHtml::_('script', 'jui/select2.min.js', false, true, false, false, $debug);
        //JHtml::_('script', 'jui/select2_locale_cs.js', false, true, false, false, $debug);
        JHtml::_('script', $http . '://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js', false, true, false, false, $debug);

        //JHtml::_('stylesheet', 'jui/select2.css', false, true);
        JHtml::_('stylesheet', $http . '://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css', false, true);
        JFactory::getDocument()->addScriptDeclaration("
                jQuery(document).ready(function (){
                    jQuery('" . $selector . "').select2({
                        " .$option. "
                    });
                });
            "
        );

        static::$loaded[__METHOD__][$selector] = true;

        return;
    }

    protected static function isSecure() {
        return
        (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off')
        || $_SERVER['SERVER_PORT'] == 443;
    }
}