public function Renderer::renderRoot in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Render/Renderer.php \Drupal\Core\Render\Renderer::renderRoot()

Renders final HTML given a structured array tree.

Calls ::render() in such a way that placeholders are replaced.

Should therefore only be used in occasions where the final rendering is happening, just before sending a Response:

• system internals that are responsible for rendering the final HTML
• render arrays for non-HTML responses, such as feeds

(Cannot be executed within another render context.)

Parameters

array $elements: The structured array describing the data to be rendered.

Return value

\Drupal\Component\Render\MarkupInterface The rendered HTML.

Throws

\LogicException When called from inside another renderRoot() call.

Overrides RendererInterface::renderRoot

See also

\Drupal\Core\Render\RendererInterface::render()

File

core/lib/Drupal/Core/Render/Renderer.php, line 135

Class

Renderer

Turns a render array into an HTML string.

Namespace

Drupal\Core\Render

Code

public function renderRoot(&$elements) {

  // Disallow calling ::renderRoot() from within another ::renderRoot() call.
  if ($this->isRenderingRoot) {
    $this->isRenderingRoot = FALSE;
    throw new \LogicException('A stray renderRoot() invocation is causing bubbling of attached assets to break.');
  }

  // Render in its own render context.
  $this->isRenderingRoot = TRUE;
  $output = $this
    ->executeInRenderContext(new RenderContext(), function () use (&$elements) {
    return $this
      ->render($elements, TRUE);
  });
  $this->isRenderingRoot = FALSE;
  return $output;
}