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I want to add variable meta tags depending on the node (a picture and custom title). These custom variables are generated in hook_preprocess_node(). Is there a way to add the metatags inside this function?

1

yes, you can, place this code in template.php in your subtheme folder

function yourtheme_preprocess_node(&$vars) {
        $element = array(
          '#tag' => 'meta', 
          '#attributes' => array(
            'name' => 'robots', 
            'content' => 'index',
          ),
        );
        drupal_add_html_head($element, 'robots');
 } 
  • Thanks allot. However I am working with Drupal 8 (sorry forgot to mention that). I found this post: stackoverflow.com/questions/36905114/… but I am not sure if it works in the hook_preproccess_node(). Do you know how it works in 8? – Michiel Oct 19 '17 at 7:11
  • my code is for D7, not shure if works in D8 – pinueve Oct 19 '17 at 7:13
1

I am aware that this does not directly answer the question, which was about adding in a preprocess function, but I would suggest that you also consider the metatag module, which is pretty full featured.

https://www.drupal.org/project/metatag

0

For me the following worked: I managed to load the current node in the hook_preprocess_node(). Based on this answer: How do I get the current node ID?

function module_name_page_attachments_alter(array &$page) {

            $node = \Drupal::routeMatch()->getParameter('node');
            if ($node instanceof \Drupal\node\NodeInterface) {
            // You can get nid and anything else you need from the node object.
            $nid = $node->id();
        }

        $ogImage = array(
            '#tag' => 'meta',
            '#attributes' => array(
                'property' => 'og:image',
                'content' => 'location of the image'.$nid.'.png',
    //my picture has the node id before the file format
            ),
        );

        $page['#attached']['html_head'][] = [$ogImage, 'ogImage'];
    }

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