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1 {#
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2 /**
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3 * @file
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4 * Theme override to navigate books.
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5 *
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6 * Presented under nodes that are a part of book outlines.
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7 *
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8 * Available variables:
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9 * - tree: The immediate children of the current node rendered as an unordered
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10 * list.
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11 * - current_depth: Depth of the current node within the book outline. Provided
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12 * for context.
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13 * - prev_url: URL to the previous node.
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14 * - prev_title: Title of the previous node.
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15 * - parent_url: URL to the parent node.
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16 * - parent_title: Title of the parent node. Not printed by default. Provided
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17 * as an option.
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18 * - next_url: URL to the next node.
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19 * - next_title: Title of the next node.
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20 * - has_links: Flags TRUE whenever the previous, parent or next data has a
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21 * value.
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22 * - book_id: The book ID of the current outline being viewed. Same as the node
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23 * ID containing the entire outline. Provided for context.
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24 * - book_url: The book/node URL of the current outline being viewed. Provided
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25 * as an option. Not used by default.
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26 * - book_title: The book/node title of the current outline being viewed.
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27 *
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28 * @see template_preprocess_book_navigation()
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29 */
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30 #}
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31 {{ attach_library('classy/book-navigation') }}
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32 {% if tree or has_links %}
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33 <nav id="book-navigation-{{ book_id }}" class="book-navigation" role="navigation" aria-labelledby="book-label-{{ book_id }}">
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34 {{ tree }}
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35 {% if has_links %}
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36 <h2 class="visually-hidden" id="book-label-{{ book_id }}">{{ 'Book traversal links for'|t }} {{ book_title }}</h2>
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37 <ul class="book-pager">
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38 {% if prev_url %}
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39 <li class="book-pager__item book-pager__item--previous">
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40 <a href="{{ prev_url }}" rel="prev" title="{{ 'Go to previous page'|t }}"><b>{{ '‹'|t }}</b> {{ prev_title }}</a>
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41 </li>
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42 {% endif %}
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43 {% if parent_url %}
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44 <li class="book-pager__item book-pager__item--center">
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45 <a href="{{ parent_url }}" title="{{ 'Go to parent page'|t }}">{{ 'Up'|t }}</a>
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46 </li>
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47 {% endif %}
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48 {% if next_url %}
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49 <li class="book-pager__item book-pager__item--next">
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50 <a href="{{ next_url }}" rel="next" title="{{ 'Go to next page'|t }}">{{ next_title }} <b>{{ '›'|t }}</b></a>
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51 </li>
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52 {% endif %}
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53 </ul>
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54 {% endif %}
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55 </nav>
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56 {% endif %}
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