status-messages.html.twig in Drupal 8

Default theme implementation for status messages.

Displays status, error, and warning messages, grouped by type.

An invisible heading identifies the messages for assistive technology. Sighted users see a colored box. See http://www.w3.org/TR/WCAG-TECHS/H69.html for info.

Add an ARIA label to the contentinfo area so that assistive technology user agents will better describe this landmark.

Available variables:

• message_list: List of messages to be displayed, grouped by type.
• status_headings: List of all status types.
• attributes: HTML attributes for the element, including:
  • class: HTML classes.

3 theme calls to status-messages.html.twig

DefaultsEntityForm::buildMessage in core/modules/layout_builder/src/Form/DefaultsEntityForm.php

Renders a message to display at the top of the layout builder.

OverridesEntityForm::buildMessage in core/modules/layout_builder/src/Form/OverridesEntityForm.php

Renders a message to display at the top of the layout builder.

StatusMessages::renderMessages in core/lib/Drupal/Core/Render/Element/StatusMessages.php

#lazy_builder callback; replaces placeholder with messages.

File

core/themes/bartik/templates/status-messages.html.twig

{#
/**
 * @file
 * Default theme implementation for status messages.
 *
 * Displays status, error, and warning messages, grouped by type.
 *
 * An invisible heading identifies the messages for assistive technology.
 * Sighted users see a colored box. See http://www.w3.org/TR/WCAG-TECHS/H69.html
 * for info.
 *
 * Add an ARIA label to the contentinfo area so that assistive technology
 * user agents will better describe this landmark.
 *
 * Available variables:
 * - message_list: List of messages to be displayed, grouped by type.
 * - status_headings: List of all status types.
 * - attributes: HTML attributes for the element, including:
 *   - class: HTML classes.
 */
#}
<div data-drupal-messages>
  {% block messages %}
    {% if message_list is not empty %}
      {{ attach_library('bartik/messages') }}
      <div class="messages__wrapper layout-container">
        {% for type, messages in message_list %}
          {%
            set classes = [
            'messages',
            'messages--' ~ type,
          ]
          %}
          <div role="contentinfo" aria-label="{{ status_headings[type] }}"{{ attributes.addClass(classes)|without('role', 'aria-label') }}>
            {% if type == 'error' %}
            <div role="alert">
              {% endif %}
              {% if status_headings[type] %}
                <h2 class="visually-hidden">{{ status_headings[type] }}</h2>
              {% endif %}
              {% if messages|length > 1 %}
                <ul class="messages__list">
                  {% for message in messages %}
                    <li class="messages__item">{{ message }}</li>
                  {% endfor %}
                </ul>
              {% else %}
                {{ messages|first }}
              {% endif %}
              {% if type == 'error' %}
            </div>
            {% endif %}
          </div>
          {# Remove type specific classes. #}
          {% set attributes = attributes.removeClass(classes) %}
        {% endfor %}
      </div>
    {% endif %}
  {% endblock messages %}
</div>