hook_ENTITY_TYPE_view_alter(array &$build, Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display)
Alter the results of the entity build array for a particular entity type.
This hook is called after the content has been assembled in a structured array and may be used for doing processing which requires that the complete entity content structure has been built.
If a module wishes to act on the rendered HTML of the entity rather than the structured content array, it may use this hook to add a #post_render callback. Alternatively, it could also implement hook_preprocess_HOOK() for the particular entity type template, if there is one (e.g., node.html.twig).
See the Default theme implementations topic and drupal_render() for details.
array &$build: A renderable array representing the entity content.
\Drupal\Core\Entity\EntityInterface $entity: The entity object being rendered.
\Drupal\Core\Entity\Display\EntityViewDisplayInterface $display: The entity view display holding the display options configured for the entity components.
function hook_ENTITY_TYPE_view_alter(array &$build, Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display) { if ($build['#view_mode'] == 'full' && isset($build['an_additional_field'])) { // Change its weight. $build['an_additional_field']['#weight'] = -10; // Add a #post_render callback to act on the rendered HTML of the entity. $build['#post_render'][] = 'my_module_node_post_render'; } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!entity.api.php/function/hook_ENTITY_TYPE_view_alter/8.1.x