/**
* {@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 {
/** @var \Drupal\Core\Ajax\AjaxResponse $response */
$response = $this->ajaxRenderer->renderResponse($result, $request, $this->routeMatch);
}
foreach ($commands as $command) {
$response->addCommand($command, TRUE);
}
return $response;
}
/**
* @covers ::buildResponse
*/
public function testBuildResponseWithUpdateCommand()
{
$triggering_element = ['#ajax' => ['callback' => function (array $form, FormStateInterface $form_state) {
return new AjaxResponse([]);
}]];
$request = new Request();
$form = ['#build_id' => 'the_build_id', '#build_id_old' => 'a_new_build_id', 'test' => ['#type' => 'textfield']];
$form_state = new FormState();
$form_state->setTriggeringElement($triggering_element);
$commands = [new AlertCommand('alert!')];
$commands_expected = [];
$commands_expected[] = ['command' => 'update_build_id', 'old' => 'a_new_build_id', 'new' => 'the_build_id'];
$commands_expected[] = ['command' => 'alert', 'text' => 'alert!'];
$this->renderer->expects($this->never())->method('renderResponse');
$result = $this->formAjaxResponseBuilder->buildResponse($request, $form, $form_state, $commands);
$this->assertInstanceOf('\\Drupal\\Core\\Ajax\\AjaxResponse', $result);
$this->assertSame($commands_expected, $result->getCommands());
}
/**
* Processes an Ajax form submission.
*
* @param \Symfony\Component\HttpFoundation\Request $request
* The current request object.
*
* @return mixed
* Whatever is returned by the triggering element's #ajax['callback']
* function. One of:
* - A render array containing the new or updated content to return to the
* browser. This is commonly an element within the rebuilt form.
* - A \Drupal\Core\Ajax\AjaxResponse object containing commands for the
* browser to process.
*
* @throws \Symfony\Component\HttpKernel\Exception\HttpExceptionInterface
*/
public function content(Request $request)
{
/** @var $ajaxForm \Drupal\system\FileAjaxForm */
$ajaxForm = $this->getForm($request);
$form = $ajaxForm->getForm();
$form_state = $ajaxForm->getFormState();
$commands = $ajaxForm->getCommands();
$this->formBuilder->processForm($form['#form_id'], $form, $form_state);
// 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.
// Since this is the generic menu callback used by many Ajax elements, 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;
/** @var $form_state \Drupal\Core\Form\FormStateInterface */
if ($triggering_element = $form_state->getTriggeringElement()) {
$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]);
// 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 {
/** @var \Drupal\Core\Ajax\AjaxResponse $response */
$response = $this->ajaxRenderer->renderResponse($result, $request, $this->routeMatch);
}
foreach ($commands as $command) {
$response->addCommand($command, TRUE);
}
return $response;
}