<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Controller

 * @subpackage Zend_Controller_Action_Helper

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: AjaxContext.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Controller_Action_Helper_ContextSwitch

 */

require_once 'Zend/Controller/Action/Helper/ContextSwitch.php';

/**

 * Simplify AJAX context switching based on requested format

 *

 * @uses       Zend_Controller_Action_Helper_Abstract

 * @category   Zend

 * @package    Zend_Controller

 * @subpackage Zend_Controller_Action_Helper

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Controller_Action_Helper_AjaxContext extends Zend_Controller_Action_Helper_ContextSwitch

{

    /**

     * Controller property to utilize for context switching

     * @var string

     */

    protected $_contextKey = 'ajaxable';

    /**

     * Constructor

     *

     * Add HTML context

     *

     * @return void

     */

    public function __construct()

    {

        parent::__construct();

        $this->addContext('html', array('suffix' => 'ajax'));

    }

    /**

     * Initialize AJAX context switching

     *

     * Checks for XHR requests; if detected, attempts to perform context switch.

     *

     * @param  string $format

     * @return void

     */

    public function initContext($format = null)

    {

        $this->_currentContext = null;

        if (!$this->getRequest()->isXmlHttpRequest()) {

            return;

        }

        return parent::initContext($format);

    }

}