TYPO3, Extbase: Simple JsonView usage

MyController.php

<?php

/* This is tested with 6.2.9 only */

namespace MY\Extension\Controller;

class MyController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {
	private $ajaxPageType = 133799;

	/**
	 * myRepository
	 *
	 * @var \MY\Extension\Domain\Repository\LocationRepository
	 * @inject
	 */
	protected $myRepository = NULL;

	/**
	 * action list
	 *
	 * @return void
	 */
	public function listAction() {
		global $TSFE;

		$items = $this->myRepository->findAll();

		if ($TSFE->type == $this->ajaxPageType) {
			$theView = $this->objectManager->get("\\TYPO3\\CMS\\Extbase\\Mvc\\View\\JsonView");
			$theView->setControllerContext($this->controllerContext);

			$theView->assign('items', $items);
			$theView->setVariablesToRender(array('items'));

			return $theView->render();
		}

		$this->view->assign("items", $items);
	}
}

/*

# TypoScript for page type:

MyExtensionAJAX = PAGE
MyExtensionAJAX {
	typeNum = 133799
	config {
		disableAllHeaderCode = 1
		xhtml_cleaning = 0
		admPanel = 0
		additionalHeaders = Content-type: application/json
		# no_cache = 1
		debug = 0
	}

	10 < tt_content.list.20.my_extension
}

*/

?>