function hook_view

Display a node.

This hook is invoked only on the module that defines the node's content type (use hook_node_view() to act on all node views).

This hook is invoked during node viewing after the node is fully loaded, so that the node type module can define a custom method for display, or add to the default display.

Parameters

\Drupal\Core\Entity\EntityInterface $node: The node to be displayed, as returned by node_load().

\Drupal\entity\Plugin\Core\Entity\EntityDisplay $display: The entity_display object holding the display options configured for the node components.

$view_mode: View mode, e.g. 'full', 'teaser', ...

Return value

The passed $node parameter should be modified as necessary and returned so it can be properly presented. Nodes are prepared for display by assembling a structured array, formatted as in the Form API, in $node->content. As with Form API arrays, the #weight property can be used to control the relative positions of added elements. After this hook is invoked, node_view() calls field_attach_view() to add field views to $node->content, and then invokes hook_node_view() and hook_node_view_alter(), so if you want to affect the final view of the node, you might consider implementing one of these hooks instead.

Related topics

Hooks
Allow modules to interact with the Drupal core.
Node API Hooks
Functions to define and modify content types.
31 functions implement hook_view()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

book_node_view in drupal/core/modules/book/book.module
Implements hook_node_view().
comment_node_view in drupal/core/modules/comment/comment.module
Implements hook_node_view().
comment_view in drupal/core/modules/comment/comment.module
Generates an array for rendering a comment.
custom_block_test_custom_block_view in drupal/core/modules/block/custom_block/tests/modules/custom_block_test/custom_block_test.module
Implements hook_custom_block_view().
entity_view in drupal/core/includes/entity.inc
Returns the render array for an entity.

... See full list

File

drupal/core/modules/node/node.api.php, line 1285
Hooks provided by the Node module.

Code

function hook_view(\Drupal\Core\Entity\EntityInterface $node, \Drupal\entity\Plugin\Core\Entity\EntityDisplay $display, $view_mode) {
  if ($view_mode == 'full' && node_is_page($node)) {
    $breadcrumb = array();
    $breadcrumb[] = l(t('Home'), NULL);
    $breadcrumb[] = l(t('Example'), 'example');
    $breadcrumb[] = l($node->field1, 'example/' . $node->field1);
    drupal_set_breadcrumb($breadcrumb);
  }

  // Only do the extra work if the component is configured to be displayed.
  // This assumes a 'mymodule_addition' extra field has been defined for the
  // node type in hook_field_extra_fields().
  if ($display
    ->getComponent('mymodule_addition')) {
    $node->content['mymodule_addition'] = array(
      '#markup' => mymodule_addition($node),
      '#theme' => 'mymodule_my_additional_field',
    );
  }
  return $node;
}