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<?php
namespace Drupal\Core\Form;
use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\UpdateBuildIdCommand;
use Drupal\Core\Render\MainContent\MainContentRendererInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\HttpException;
/**
* Builds an AJAX form response.
*
* Given the current request, a form render array, its form state, and any AJAX
* commands to apply to the form, build a response object.
*/
class FormAjaxResponseBuilder implements FormAjaxResponseBuilderInterface {
/**
* The main content to AJAX Response renderer.
*
* @var \Drupal\Core\Render\MainContent\MainContentRendererInterface
*/
protected $ajaxRenderer;
/**
* The current route match.
*
* @var \Drupal\Core\Routing\RouteMatchInterface
*/
protected $routeMatch;
/**
* Constructs a new FormAjaxResponseBuilder.
*
* @param \Drupal\Core\Render\MainContent\MainContentRendererInterface $ajax_renderer
* The ajax renderer.
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The current route match.
*/
public function __construct(MainContentRendererInterface $ajax_renderer, RouteMatchInterface $route_match) {
$this->ajaxRenderer = $ajax_renderer;
$this->routeMatch = $route_match;
}
/**
* {@inheritdoc}
*/
public function buildResponse(Request $request, array $form, FormStateInterface $form_state, array $commands) {
// If the form build ID has changed, issue an Ajax command to update it.
if (isset($form['#build_id_old']) && $form['#build_id_old'] !== $form['#build_id']) {
$commands[] = new UpdateBuildIdCommand($form['#build_id_old'], $form['#build_id']);
}
// We need to return the part of the form (or some other content) that needs
// to be re-rendered so the browser can update the page with changed
// content. It is up to the #ajax['callback'] function of the element (may
// or may not be a button) that triggered the Ajax request to determine what
// needs to be rendered.
$callback = NULL;
if (($triggering_element = $form_state->getTriggeringElement()) && isset($triggering_element['#ajax']['callback'])) {
$callback = $triggering_element['#ajax']['callback'];
}
$callback = $form_state->prepareCallback($callback);
if (empty($callback) || !is_callable($callback)) {
throw new HttpException(500, 'The specified #ajax callback is empty or not callable.');
}
$result = call_user_func_array($callback, [&$form, &$form_state, $request]);
// If the callback is an #ajax callback, the result is a render array, and
// we need to turn it into an AJAX response, so that we can add any commands
// we got earlier; typically the UpdateBuildIdCommand when handling an AJAX
// submit from a cached page.
if ($result instanceof AjaxResponse) {
$response = $result;
}
else {
// At this point we know callback returned a render element. If the
// element is part of the group (#group is set on it) it won't be rendered
// unless we remove #group from it. This is caused by
// \Drupal\Core\Render\Element\RenderElement::preRenderGroup(), which
// prevents all members of groups from being rendered directly.
if (!empty($result['#group'])) {
unset($result['#group']);
}
/** @var \Drupal\Core\Ajax\AjaxResponse $response */
$response = $this->ajaxRenderer->renderResponse($result, $request, $this->routeMatch);
}
foreach ($commands as $command) {
$response->addCommand($command, TRUE);
}
return $response;
}
}