To pass custom variables to twig file in drupal 8, you must create a preprocess function, for the template:
/**
* @param $variables
*/
function MY_MODULE_preprocess_TEMPLATE(&$variables) {
$VARIABLE_NAME = 'my_variable custom text';
$variables['my_variable'] = $VARIABLE_NAME ;
}
to print variable in twig file just use {{ my_variable }}.
Example how to pass variables to node twig file:
/**
* @param $variables
*/
function mytheme_preprocess_node(&$variables)
{
$node = \Drupal::routeMatch()->getParameter('node');
$nid = $node->id();
$variables['id'] = $nid;
}
Example how to pass variables to page twig file:
/**
* @param $variables
*/
function mytheme_preprocess_page(&$variables)
{
$parameters = \Drupal::routeMatch()->getParameters()->all();
if (isset($parameters['taxonomy_term'])) {
$term = $parameters['taxonomy_term'];
if ($term->getVocabularyId() == 'tag') {
$variables['is_tag_taxonomy_term_page'] = TRUE;
}
}
}
Example how to pass variables to region twig file:
/**
* @param $variables
*/
function mytheme_preprocess_region(&$variables)
{
if ($variables['region'] == 'content') {
$variables['custom_variable'] = 'DEFAULT_VALUE';
}
}
Example how to pass variables to menu twig file:
/**
* @param $variables
*/
function THEMENAME_preprocess_menu(&$variables) {
$variables['language'] = \Drupal::languageManager()->getCurrentLanguage();
}
Example how to pass variables to links twig file:
/**
* @param $variables
*/
function mytheme_preprocess_links(&$variables) {
$variables['language'] = \Drupal::languageManager()->getCurrentLanguage()->getId();
}
Example how to pass variables to views view unformatted twig file (views-view-unformatted.html.twig):
/**
* @param $variables
*/
function THEMENAME_preprocess_views_view_unformatted(&$variables)
{
// Example 1
$variables['current_language'] = \Drupal::languageManager()
->getCurrentLanguage()
->getId();
// Example 2
$variables['count_rows'] = count($variables['rows']);
}
Example how to pass variables to block twig file (block.html.twig):
/**
* Process block content
*/
function THEMENAME_preprocess_block(&$variables) {
$variables['base_path'] = base_path();
}
Example how to pass current language variable to select twig file (select.html.twig):
/**
* @param $variables
*/
function THEMENAME_preprocess_select(&$variables)
{
$variables['current_language'] = \Drupal::languageManager()->getCurrentLanguage()->getId();
}
Example how to pass variable to menu twig file (menu.html.twig):
/**
* @param $variables
*/
function THEMENAME_preprocess_menu(&$variables)
{
$variables['current_language'] = \Drupal::languageManager()->getCurrentLanguage()->getId();
}
