class BuildDemo in Examples for Developers 8

Same name and namespace in other branches

3.x modules/form_api_example/src/Form/BuildDemo.php \Drupal\form_api_example\Form\BuildDemo

Implements the build demo form controller.

This example uses the Messenger service to demonstrate the order of controller method invocations by the form api.

Hierarchy

class \Drupal\Core\Form\FormBase implements ContainerInjectionInterface, FormInterface uses DependencySerializationTrait, LoggerChannelTrait, MessengerTrait, LinkGeneratorTrait, RedirectDestinationTrait, UrlGeneratorTrait, StringTranslationTrait
- class \Drupal\form_api_example\Form\BuildDemo

Expanded class hierarchy of BuildDemo

File

form_api_example/src/Form/BuildDemo.php, line 17

Namespace

Drupal\form_api_example\Form

View source

class BuildDemo extends FormBase {

  /**
   * Counter keeping track of the sequence of method invocation.
   *
   * @var int
   */
  protected static $sequenceCounter = 0;

  /**
   * {@inheritdoc}
   */
  public function __construct() {
    $this
      ->displayMethodInvocation('__construct');
  }

  /**
   * Update form processing information.
   *
   * Display the method being called and it's sequence in the form
   * processing.
   *
   * @param string $method_name
   *   The method being invoked.
   */
  private function displayMethodInvocation($method_name) {
    self::$sequenceCounter++;
    $this
      ->messenger()
      ->addMessage(self::$sequenceCounter . ". {$method_name}");
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['description'] = [
      '#type' => 'item',
      '#markup' => $this
        ->t('Demonstrates how submit, rebuild, form-rebuild and #ajax submit work.'),
    ];

    // Simple checkbox for ajax orders.
    $form['change'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Change Me'),
      '#ajax' => [
        'callback' => '::ajaxSubmit',
        'wrapper' => 'message-wrapper',
      ],
    ];
    $form['actions'] = [
      '#type' => 'actions',
    ];

    // Add a submit button that handles the submission of the form.
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => 'Submit',
    ];

    // Add button handlers.
    $form['actions']['button'] = [
      '#type' => 'button',
      '#value' => 'Rebuild',
    ];
    $form['actions']['rebuild'] = [
      '#type' => 'submit',
      '#value' => 'Submit Rebuild',
      '#submit' => [
        '::rebuildFormSubmit',
      ],
    ];
    $form['actions']['ajaxsubmit'] = [
      '#type' => 'submit',
      '#value' => 'Ajax Submit',
      '#ajax' => [
        'callback' => '::ajaxSubmit',
        'wrapper' => 'message-wrapper',
      ],
    ];
    $form['messages'] = [
      '#type' => 'container',
      '#attributes' => [
        'id' => 'message-wrapper',
      ],
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    $this
      ->displayMethodInvocation('getFormId');
    return 'form_api_example_build_form';
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    $this
      ->displayMethodInvocation('validateForm');
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this
      ->displayMethodInvocation('submitForm');
  }

  /**
   * Implements ajax submit callback.
   *
   * @param array $form
   *   Form render array.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Current state of the form.
   */
  public function ajaxSubmit(array &$form, FormStateInterface $form_state) {
    $this
      ->displayMethodInvocation('ajaxSubmit');
    $form['messages']['status'] = [
      '#type' => 'status_messages',
    ];
    return $form['messages'];
  }

  /**
   * Implements submit callback for Rebuild button.
   *
   * @param array $form
   *   Form render array.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Current state of the form.
   */
  public function rebuildFormSubmit(array &$form, FormStateInterface $form_state) {
    $this
      ->displayMethodInvocation('rebuildFormSubmit');
    $form_state
      ->setRebuild(TRUE);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
BuildDemo::$sequenceCounter	protected static	property	Counter keeping track of the sequence of method invocation.
BuildDemo::ajaxSubmit	public	function	Implements ajax submit callback.
BuildDemo::buildForm	public	function	Form constructor. Overrides FormInterface::buildForm
BuildDemo::displayMethodInvocation	private	function	Update form processing information.
BuildDemo::getFormId	public	function	Returns a unique string identifying the form. Overrides FormInterface::getFormId
BuildDemo::rebuildFormSubmit	public	function	Implements submit callback for Rebuild button.
BuildDemo::submitForm	public	function	Form submission handler. Overrides FormInterface::submitForm
BuildDemo::validateForm	public	function	Form validation handler. Overrides FormBase::validateForm
BuildDemo::__construct	public	function
DependencySerializationTrait::$_entityStorages	protected	property	An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds	protected	property	An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep	public	function		1
DependencySerializationTrait::__wakeup	public	function		2
FormBase::$configFactory	protected	property	The config factory.	1
FormBase::$requestStack	protected	property	The request stack.	1
FormBase::$routeMatch	protected	property	The route match.
FormBase::config	protected	function	Retrieves a configuration object.
FormBase::configFactory	protected	function	Gets the config factory for this form.	1
FormBase::container	private	function	Returns the service container.
FormBase::create	public static	function	Instantiates a new instance of this class. Overrides ContainerInjectionInterface::create	87
FormBase::currentUser	protected	function	Gets the current user.
FormBase::getRequest	protected	function	Gets the request object.
FormBase::getRouteMatch	protected	function	Gets the route match.
FormBase::logger	protected	function	Gets the logger for a specific channel.
FormBase::redirect	protected	function	Returns a redirect response object for the specified route. Overrides UrlGeneratorTrait::redirect
FormBase::resetConfigFactory	public	function	Resets the configuration factory.
FormBase::setConfigFactory	public	function	Sets the config factory for this form.
FormBase::setRequestStack	public	function	Sets the request stack object to use.
LinkGeneratorTrait::$linkGenerator	protected	property	The link generator.	1
LinkGeneratorTrait::getLinkGenerator Deprecated	protected	function	Returns the link generator.
LinkGeneratorTrait::l Deprecated	protected	function	Renders a link to a route given a route name and its parameters.
LinkGeneratorTrait::setLinkGenerator Deprecated	public	function	Sets the link generator service.
LoggerChannelTrait::$loggerFactory	protected	property	The logger channel factory service.
LoggerChannelTrait::getLogger	protected	function	Gets the logger for a specific channel.
LoggerChannelTrait::setLoggerFactory	public	function	Injects the logger channel factory.
MessengerTrait::$messenger	protected	property	The messenger.	29
MessengerTrait::messenger	public	function	Gets the messenger.	29
MessengerTrait::setMessenger	public	function	Sets the messenger.
RedirectDestinationTrait::$redirectDestination	protected	property	The redirect destination service.	1
RedirectDestinationTrait::getDestinationArray	protected	function	Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url.
RedirectDestinationTrait::getRedirectDestination	protected	function	Returns the redirect destination service.
RedirectDestinationTrait::setRedirectDestination	public	function	Sets the redirect destination service.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.	1
StringTranslationTrait::formatPlural	protected	function	Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals	protected	function	Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation	protected	function	Gets the string translation service.
StringTranslationTrait::setStringTranslation	public	function	Sets the string translation service to use.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.
UrlGeneratorTrait::$urlGenerator	protected	property	The url generator.
UrlGeneratorTrait::getUrlGenerator Deprecated	protected	function	Returns the URL generator service.
UrlGeneratorTrait::setUrlGenerator Deprecated	public	function	Sets the URL generator service.
UrlGeneratorTrait::url Deprecated	protected	function	Generates a URL or path for a specific route based on the given parameters.

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class BuildDemo in Examples for Developers 8

Hierarchy

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