AjaxRenderer.php in Zircon Profile 8.0

Contains \Drupal\Core\Render\MainContent\AjaxRenderer.

Namespace

Drupal\Core\Render\MainContent

File

core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php

<?php

/**
 * @file
 * Contains \Drupal\Core\Render\MainContent\AjaxRenderer.
 */
namespace Drupal\Core\Render\MainContent;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\AlertCommand;
use Drupal\Core\Ajax\InsertCommand;
use Drupal\Core\Ajax\PrependCommand;
use Drupal\Core\Render\ElementInfoManagerInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Default main content renderer for Ajax requests.
 */
class AjaxRenderer implements MainContentRendererInterface {

  /**
   * The controller resolver.
   *
   * @var \Drupal\Core\Controller\ControllerResolverInterface
   */
  protected $controllerResolver;

  /**
   * The element info manager.
   *
   * @var \Drupal\Core\Render\ElementInfoManagerInterface
   */
  protected $elementInfoManager;

  /**
   * Constructs a new AjaxRenderer instance.
   *
   * @param \Drupal\Core\Render\ElementInfoManagerInterface $element_info_manager
   *   The element info manager.
   */
  public function __construct(ElementInfoManagerInterface $element_info_manager) {
    $this->elementInfoManager = $element_info_manager;
  }

  /**
   * {@inheritdoc}
   */
  public function renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match) {
    $response = new AjaxResponse();
    if (isset($main_content['#type']) && $main_content['#type'] == 'ajax') {

      // Complex Ajax callbacks can return a result that contains an error
      // message or a specific set of commands to send to the browser.
      $main_content += $this->elementInfoManager
        ->getInfo('ajax');
      $error = $main_content['#error'];
      if (!empty($error)) {

        // Fall back to some default message otherwise use the specific one.
        if (!is_string($error)) {
          $error = 'An error occurred while handling the request: The server received invalid input.';
        }
        $response
          ->addCommand(new AlertCommand($error));
      }
    }
    $html = $this
      ->drupalRenderRoot($main_content);
    $response
      ->setAttachments($main_content['#attached']);

    // The selector for the insert command is NULL as the new content will
    // replace the element making the Ajax call. The default 'replaceWith'
    // behavior can be changed with #ajax['method'].
    $response
      ->addCommand(new InsertCommand(NULL, $html));
    $status_messages = array(
      '#type' => 'status_messages',
    );
    $output = $this
      ->drupalRenderRoot($status_messages);
    if (!empty($output)) {
      $response
        ->addCommand(new PrependCommand(NULL, $output));
    }
    return $response;
  }

  /**
   * Wraps drupal_render_root().
   *
   * @todo Remove as part of https://www.drupal.org/node/2182149.
   */
  protected function drupalRenderRoot(&$elements) {
    return drupal_render_root($elements);
  }

}

Classes

Name	Description
AjaxRenderer	Default main content renderer for Ajax requests.