Default theme implementation to navigate books.
Presented under nodes that are a part of book outlines.
Available variables:
- tree: The immediate children of the current node rendered as an unordered list.
- current_depth: Depth of the current node within the book outline. Provided for context.
- prev_url: URL to the previous node.
- prev_title: Title of the previous node.
- parent_url: URL to the parent node.
- parent_title: Title of the parent node. Not printed by default. Provided as an option.
- next_url: URL to the next node.
- next_title: Title of the next node.
- has_links: Flags TRUE whenever the previous, parent or next data has a value.
- book_id: The book ID of the current outline being viewed. Same as the node ID containing the entire outline. Provided for context.
- book_url: The book/node URL of the current outline being viewed. Provided as an option. Not used by default.
- book_title: The book/node title of the current outline being viewed.
See also
template_preprocess_book_navigation()
File
core/modules/book/templates/book-navigation.html.twig
Related topics
- Theme system overview
- Functions and templates for the user interface that themes can override.
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