Default theme implementation to display a book tree.
Returns HTML for a wrapper for a book sub-tree.
Available variables:
-
items: A nested list of book items. Each book item contains:
- attributes: HTML attributes for the book item.
- below: The book item child items.
- title: The book link title.
- url: The book link URL, instance of \Drupal\Core\Url.
- is_expanded: TRUE if the link has visible children within the current book tree.
- is_collapsed: TRUE if the link has children within the current book tree that are not currently visible.
- in_active_trail: TRUE if the link is in the active trail.
File
core/modules/book/templates/book-tree.html.twig
Related topics
- Theme system overview
- Functions and templates for the user interface that themes can override.
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