class SimpleForm in Examples for Developers 8

Same name and namespace in other branches

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

Implements the SimpleForm form controller.

This example demonstrates a simple form with a single text input element. We extend FormBase which is the simplest form base class used in Drupal.

Hierarchy

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

Expanded class hierarchy of SimpleForm

File

form_api_example/src/Form/SimpleForm.php, line 16

Namespace

Drupal\form_api_example\Form

View source

class SimpleForm extends FormBase {

  /**
   * Build the simple form.
   *
   * A build form method constructs an array that defines how markup and
   * other form elements are included in an HTML form.
   *
   * @param array $form
   *   Default form array structure.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Object containing current form state.
   *
   * @return array
   *   The render array defining the elements of the form.
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['description'] = [
      '#type' => 'item',
      '#markup' => $this
        ->t('This basic example shows a single text input element and a submit button'),
    ];
    $form['title'] = [
      '#type' => 'textfield',
      '#title' => $this
        ->t('Title'),
      '#description' => $this
        ->t('Title must be at least 5 characters in length.'),
      '#required' => TRUE,
    ];

    // Group submit handlers in an actions element with a key of "actions" so
    // that it gets styled correctly, and so that other modules may add actions
    // to the form. This is not required, but is convention.
    $form['actions'] = [
      '#type' => 'actions',
    ];

    // Add a submit button that handles the submission of the form.
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this
        ->t('Submit'),
    ];
    return $form;
  }

  /**
   * Getter method for Form ID.
   *
   * The form ID is used in implementations of hook_form_alter() to allow other
   * modules to alter the render array built by this form controller. It must be
   * unique site wide. It normally starts with the providing module's name.
   *
   * @return string
   *   The unique ID of the form defined by this class.
   */
  public function getFormId() {
    return 'form_api_example_simple_form';
  }

  /**
   * Implements form validation.
   *
   * The validateForm method is the default method called to validate input on
   * a form.
   *
   * @param array $form
   *   The render array of the currently built form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Object describing the current state of the form.
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    $title = $form_state
      ->getValue('title');
    if (strlen($title) < 5) {

      // Set an error for the form element with a key of "title".
      $form_state
        ->setErrorByName('title', $this
        ->t('The title must be at least 5 characters long.'));
    }
  }

  /**
   * Implements a form submit handler.
   *
   * The submitForm method is the default method called for any submit elements.
   *
   * @param array $form
   *   The render array of the currently built form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   Object describing the current state of the form.
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {

    /*
     * This would normally be replaced by code that actually does something
     * with the title.
     */
    $title = $form_state
      ->getValue('title');
    $this
      ->messenger()
      ->addMessage($this
      ->t('You specified a title of %title.', [
      '%title' => $title,
    ]));
  }

}

Members

Name	Modifiers	Type	Description	Overrides
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::$redirectDestination	protected	property	The redirect destination service.	1
RedirectDestinationTrait::getDestinationArray	protected	function	Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url.
RedirectDestinationTrait::getRedirectDestination	protected	function	Returns the redirect destination service.
RedirectDestinationTrait::setRedirectDestination	public	function	Sets the redirect destination service.
SimpleForm::buildForm	public	function	Build the simple form. Overrides FormInterface::buildForm
SimpleForm::getFormId	public	function	Getter method for Form ID. Overrides FormInterface::getFormId
SimpleForm::submitForm	public	function	Implements a form submit handler. Overrides FormInterface::submitForm
SimpleForm::validateForm	public	function	Implements form validation. Overrides FormBase::validateForm
StringTranslationTrait::$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 SimpleForm in Examples for Developers 8

Hierarchy

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