How do I print the {{messages}} variable?

Question

In Drupal 7 I was able to do something like this:

<?php echo $messages; ?>

It seems this variable is no more in Drupal 8.

{{messages}} // This returns NULL on {{dump(messages)}}.

I basically have a page--user--login.html.twig where I output the page.content and above that I want the messages to be displayed, in case there are errors on the page and not the entire header.

// Not desirable
{% if page.header %}
   {% block header %}
     <div class="col-sm-12" role="heading">
         {{ page.header }}
      </div>
   {% endblock %}
{% endif %}

What is the correct variable name for <?php echo $messages ?> in Drupal 8?

Answer 1

By default the messages are in the highlighted region, put this in your page twig:

{{ page.highlighted }}

If you changed the block layout, go to

admin/structure/block

and check in which region you placed the status message block. When it is disabled, move it back into a region.

Answer 2

I display block with status messages by the next way:

1. in hook_preprocess_page() add custom variable and put in messages block

function my_theme_preprocess_page(array &$variables) { // add messages block to front page if ($variables['is_front']) { $block_msg = \Drupal\block\Entity\Block::load('dtt_theme_messages'); $variables['custom_system_messages'] = \Drupal::entityTypeManager() ->getViewBuilder('block') - >view($block_msg); } }

2. in twig template, for my example page--front.html.twig, I can insert block with messages in any place

{{ custom_system_messages }}

Answer 3

you can print the message by:

{{ page.highlighted.bartik_messages }}

bartik_messages is the Machine name of this block for current theme

In general, you could use the following pattern:

{{ page.MESSAGES_BLOCK_REGION.THEME_NAME_messages }}