4 * Default theme implementation to navigate books.
6 * Presented under nodes that are a part of book outlines.
9 * - tree: The immediate children of the current node rendered as an unordered
11 * - current_depth: Depth of the current node within the book outline. Provided
13 * - prev_url: URL to the previous node.
14 * - prev_title: Title of the previous node.
15 * - parent_url: URL to the parent node.
16 * - parent_title: Title of the parent node. Not printed by default. Provided
18 * - next_url: URL to the next node.
19 * - next_title: Title of the next node.
20 * - has_links: Flags TRUE whenever the previous, parent or next data has a
22 * - book_id: The book ID of the current outline being viewed. Same as the node
23 * ID containing the entire outline. Provided for context.
24 * - book_url: The book/node URL of the current outline being viewed. Provided
25 * as an option. Not used by default.
26 * - book_title: The book/node title of the current outline being viewed.
28 * @see template_preprocess_book_navigation()
33 {% if tree or has_links %}
34 <nav role="navigation" aria-labelledby="book-label-{{ book_id }}">
37 <h2>{{ 'Book traversal links for'|t }} {{ book_title }}</h2>
41 <a href="{{ prev_url }}" rel="prev" title="{{ 'Go to previous page'|t }}"><b>{{ '‹'|t }}</b> {{ prev_title }}</a>
46 <a href="{{ parent_url }}" title="{{ 'Go to parent page'|t }}">{{ 'Up'|t }}</a>
51 <a href="{{ next_url }}" rel="next" title="{{ 'Go to next page'|t }}">{{ next_title }} <b>{{ '›'|t }}</b></a>