class SimpleForm

Same name in other branches
  1. 4.0.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

Expanded class hierarchy of SimpleForm

See also

\Drupal\Core\Form\FormBase

1 file declares its use of SimpleForm
SimpleFormBlock.php in modules/form_api_example/src/Plugin/Block/SimpleFormBlock.php
1 string reference to 'SimpleForm'
form_api_example.routing.yml in modules/form_api_example/form_api_example.routing.yml
modules/form_api_example/form_api_example.routing.yml

File

modules/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

Title Sort descending Modifiers Object type Summary Overriden Title Overrides
DependencySerializationTrait::$_entityStorages protected property
DependencySerializationTrait::$_serviceIds protected property
DependencySerializationTrait::__sleep public function 1
DependencySerializationTrait::__wakeup public function 2
FormBase::$configFactory protected property The config factory. 3
FormBase::$requestStack protected property The request stack. 1
FormBase::$routeMatch protected property The route match.
FormBase::config protected function Retrieves a configuration object.
FormBase::configFactory protected function Gets the config factory for this form. 3
FormBase::container private function Returns the service container.
FormBase::create public static function Instantiates a new instance of this class. Overrides ContainerInjectionInterface::create 105
FormBase::currentUser protected function Gets the current user.
FormBase::getRequest protected function Gets the request object.
FormBase::getRouteMatch protected function Gets the route match.
FormBase::logger protected function Gets the logger for a specific channel.
FormBase::redirect protected function Returns a redirect response object for the specified route.
FormBase::resetConfigFactory public function Resets the configuration factory.
FormBase::setConfigFactory public function Sets the config factory for this form.
FormBase::setRequestStack public function Sets the request stack object to use.
LoggerChannelTrait::$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::$messenger protected property The messenger. 17
MessengerTrait::messenger public function Gets the messenger. 17
MessengerTrait::setMessenger public function Sets the messenger.
RedirectDestinationTrait::$redirectDestination protected property The redirect destination service. 1
RedirectDestinationTrait::getDestinationArray protected function Prepares a &#039;destination&#039; 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. 3
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.