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- {#
- /**
- * @file
- * 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 template_preprocess_book_navigation()
- *
- * @ingroup themeable
- */
- #}
- {% if tree or has_links %}
- <nav role="navigation" aria-labelledby="book-label-{{ book_id }}">
- {{ tree }}
- {% if has_links %}
- <h2>{{ 'Book traversal links for'|t }} {{ book_title }}</h2>
- <ul>
- {% if prev_url %}
- <li>
- <a href="{{ prev_url }}" rel="prev" title="{{ 'Go to previous page'|t }}"><b>{{ '‹'|t }}</b> {{ prev_title }}</a>
- </li>
- {% endif %}
- {% if parent_url %}
- <li>
- <a href="{{ parent_url }}" title="{{ 'Go to parent page'|t }}">{{ 'Up'|t }}</a>
- </li>
- {% endif %}
- {% if next_url %}
- <li>
- <a href="{{ next_url }}" rel="next" title="{{ 'Go to next page'|t }}">{{ next_title }} <b>{{ '›'|t }}</b></a>
- </li>
- {% endif %}
- </ul>
- {% endif %}
- </nav>
- {% endif %}
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