I'd like to add a single taxonomy term into the body tag as a class in drupal 8 - so I page styles can be controlled easily. I have tried (path and ID as class in body How can I dynamically add URL or taxonomy to body class and https://www.drupal.org/node/2634364) which only get me part way there, taxonomy term would provide a future proofed solution.
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2 Answers
i found a solution which worked perfectly for me. Add this in your .theme file and replace mytheme_preprocess_html by your theme name and field_section by name of your taxonomy field.
[https://gist.github.com/awasson/d8ef8d7c1b64b2ccb8a0][1]
<?php
/**
* Prepares variables for the html.html.twig template.
*/
use Drupal\taxonomy\Entity\Term;
use Drupal\Component\Utility\Html;
function mytheme_preprocess_html(&$variables) {
if ($node = \Drupal::routeMatch()->getParameter('node')) {
/**
* Get the term id from the 'field_section' taxonomy field.
* If greater than zero, load the term and acquire the name value
* as a css safe value.
*/
if($node->hasField('field_section')) {
$tid = $node->get('field_section')->target_id;
if($tid > 0) {
$term_object = Term::load($tid);
$variables['attributes']['class'][] = 'terms--' . Html::getClass($term_object->get('name')->value);
}
}
/**
* Get the node id from the node object.
* If greater than zero, add the node id to body classes
*/
$nid = $node->get('nid')->value;
if($nid > 0) {
$variables['attributes']['class'][] = 'page--node-' . $nid;
}
}
}
Here it is my snippet for field_razdel with transliteration (as my site is not english).
Finally I have these body classes (other elements are added with another piece of code):
<body class="no-sidebars terms--obrazovanie path-node page-node-type-article">
terms--obrazovanie is added by next snippet:
// Add taxonomy term from field_razdel as body class.
if ($node = \Drupal::routeMatch()->getParameter('node')) {
// Get the term id from the 'field_section' taxonomy field.
// If greater than zero, load the term and acquire the name value
// as a css safe value.
// Use the current default interface language.
$langcode = \Drupal::languageManager()
->getCurrentLanguage()
->getId();
// Instantiate the transliteration class.
$trans = \Drupal::transliteration();
if ($node->hasField('field_razdel')) {
$tid = $node->get('field_razdel')->target_id;
if ($tid > 0) {
$term_object = Term::load($tid);
//$variables['attributes']['class'][] = 'terms--' . Html::getClass($term_object->get('name')->value);
$transformed = $trans
->transliterate(Html::getClass($term_object->get('name')->value), $langcode);
$variables['attributes']['class'][] = 'terms--' . $transformed;
}
}
}
