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class AjaxRenderer in Drupal 9

Same name and namespace in other branches
  1. 8 core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php \Drupal\Core\Render\MainContent\AjaxRenderer

Default main content renderer for Ajax requests.

Hierarchy

Expanded class hierarchy of AjaxRenderer

1 file declares its use of AjaxRenderer
AjaxRendererTest.php in core/tests/Drupal/Tests/Core/Controller/AjaxRendererTest.php
1 string reference to 'AjaxRenderer'
core.services.yml in core/core.services.yml
core/core.services.yml
1 service uses AjaxRenderer
main_content_renderer.ajax in core/core.services.yml
Drupal\Core\Render\MainContent\AjaxRenderer

File

core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php, line 17

Namespace

Drupal\Core\Render\MainContent
View source
class AjaxRenderer implements MainContentRendererInterface {

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

  /**
   * The renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

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

  /**
   * {@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 = $this->renderer
      ->renderRoot($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 = [
      '#type' => 'status_messages',
    ];
    $output = $this->renderer
      ->renderRoot($status_messages);
    if (!empty($output)) {
      $response
        ->addCommand(new PrependCommand(NULL, $output));
    }
    return $response;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
AjaxRenderer::$elementInfoManager protected property The element info manager.
AjaxRenderer::$renderer protected property The renderer.
AjaxRenderer::renderResponse public function Renders the main content render array into a response. Overrides MainContentRendererInterface::renderResponse
AjaxRenderer::__construct public function Constructs a new AjaxRenderer instance.