class StatusMessages in Drupal 8

Same name and namespace in other branches

9 core/lib/Drupal/Core/Render/Element/StatusMessages.php \Drupal\Core\Render\Element\StatusMessages

Provides a messages element.

Used to display results of \Drupal::messenger()->addMessage() calls.

Usage example:

$build['status_messages'] = [
  '#type' => 'status_messages',
];

Plugin annotation

@RenderElement("status_messages");

Hierarchy

class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
- class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, MessengerTrait, StringTranslationTrait
  - class \Drupal\Core\Render\Element\RenderElement implements ElementInterface
    class \Drupal\Core\Render\Element\StatusMessages

Expanded class hierarchy of StatusMessages

1 file declares its use of StatusMessages

QuickEditImageController.php in core/modules/image/src/Controller/QuickEditImageController.php

26 #type uses of StatusMessages

AddFormBase::buildForm in core/modules/media_library/src/Form/AddFormBase.php: Form constructor.
AjaxFormHelperTrait::ajaxSubmit in core/lib/Drupal/Core/Ajax/AjaxFormHelperTrait.php: Submit form dialog #ajax callback.
AjaxRenderer::renderResponse in core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php: Renders the main content render array into a response.
BareHtmlPageRenderer::renderBarePage in core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php: Renders a bare page.
BigPipePlaceholderTestCases::cases in core/modules/big_pipe/tests/modules/big_pipe_test/src/BigPipePlaceholderTestCases.php: Gets all BigPipe placeholder test cases.

... See full list

File

core/lib/Drupal/Core/Render/Element/StatusMessages.php, line 19

Namespace

Drupal\Core\Render\Element

View source

class StatusMessages extends RenderElement {

  /**
   * {@inheritdoc}
   *
   * Generate the placeholder in a #pre_render callback, because the hash salt
   * needs to be accessed, which may not yet be available when this is called.
   */
  public function getInfo() {
    return [
      // May have a value of 'status' or 'error' when only displaying messages
      // of that specific type.
      '#display' => NULL,
      '#pre_render' => [
        get_class() . '::generatePlaceholder',
      ],
      '#include_fallback' => FALSE,
    ];
  }

  /**
   * #pre_render callback to generate a placeholder.
   *
   * @param array $element
   *   A renderable array.
   *
   * @return array
   *   The updated renderable array containing the placeholder.
   */
  public static function generatePlaceholder(array $element) {
    $build = [
      '#lazy_builder' => [
        get_class() . '::renderMessages',
        [
          $element['#display'],
        ],
      ],
      '#create_placeholder' => TRUE,
    ];

    // Directly create a placeholder as we need this to be placeholdered
    // regardless if this is a POST or GET request.
    // @todo remove this when https://www.drupal.org/node/2367555 lands.
    $build = \Drupal::service('render_placeholder_generator')
      ->createPlaceholder($build);
    if ($element['#include_fallback']) {
      return [
        'fallback' => [
          '#markup' => '<div data-drupal-messages-fallback class="hidden"></div>',
        ],
        'messages' => $build,
      ];
    }
    return $build;
  }

  /**
   * #lazy_builder callback; replaces placeholder with messages.
   *
   * @param string|null $type
   *   Limit the messages returned by type. Defaults to NULL, meaning all types.
   *   Passed on to \Drupal\Core\Messenger\Messenger::deleteByType(). These
   *   values are supported:
   *   - NULL
   *   - 'status'
   *   - 'warning'
   *   - 'error'
   *
   * @return array
   *   A renderable array containing the messages.
   *
   * @see \Drupal\Core\Messenger\Messenger::deleteByType()
   */
  public static function renderMessages($type = NULL) {
    $render = [];
    if (isset($type)) {
      $messages = [
        $type => \Drupal::messenger()
          ->deleteByType($type),
      ];
    }
    else {
      $messages = \Drupal::messenger()
        ->deleteAll();
    }
    if ($messages) {

      // Render the messages.
      $render = [
        '#theme' => 'status_messages',
        '#message_list' => $messages,
        '#status_headings' => [
          'status' => t('Status message'),
          'error' => t('Error message'),
          'warning' => t('Warning message'),
        ],
      ];
    }
    return $render;
  }

}

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
MessengerTrait::$messenger	protected	property	The messenger.	29
MessengerTrait::messenger	public	function	Gets the messenger.	29
MessengerTrait::setMessenger	public	function	Sets the messenger.
PluginBase::$configuration	protected	property	Configuration information passed into the plugin.	1
PluginBase::$pluginDefinition	protected	property	The plugin implementation definition.	1
PluginBase::$pluginId	protected	property	The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR		constant	A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId	public	function	Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId	public	function	Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition	public	function	Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition	3
PluginBase::getPluginId	public	function	Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable	public	function	Determines if the plugin is configurable.
PluginBase::__construct	public	function	Constructs a \Drupal\Component\Plugin\PluginBase object.	92
RenderElement::preRenderAjaxForm	public static	function	Adds Ajax information about an element to communicate with JavaScript.
RenderElement::preRenderGroup	public static	function	Adds members of this group as actual elements for rendering.
RenderElement::processAjaxForm	public static	function	Form element processing handler for the #ajax form property.	1
RenderElement::processGroup	public static	function	Arranges elements into groups.
RenderElement::setAttributes	public static	function	Sets a form element's class attribute. Overrides ElementInterface::setAttributes
StatusMessages::generatePlaceholder	public static	function	#pre_render callback to generate a placeholder.
StatusMessages::getInfo	public	function	Generate the placeholder in a #pre_render callback, because the hash salt needs to be accessed, which may not yet be available when this is called. Overrides ElementInterface::getInfo
StatusMessages::renderMessages	public static	function	#lazy_builder callback; replaces placeholder with messages.
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.

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