theme_book_navigation

Prepares both the custom breadcrumb trail and the forward/backward navigation for a node presented as a book page.

Related topics

Themeable functions

Functions that display HTML, and which can be customized by themes.

1 theme call to theme_book_navigation()

File

modules/book.module, line 442

Allows users to collaboratively author a book.

Code

function theme_book_navigation($node) {
  $path = book_location($node);

  // Construct the breadcrumb:

  $node->breadcrumb = array(); // Overwrite the trail with a book trail.
  foreach ($path as $level) {
    $node->breadcrumb[] = array(
      'path' => 'node/' . $level->nid,
      'title' => $level->title,
    );
  }
  $node->breadcrumb[] = array('path' => 'node/' . $node->nid);

  if ($node->nid) {
    $output .= '<div class="book">';

    if ($tree = book_tree($node->nid)) {
      $output .= '<div class="tree">' . $tree . '</div>';
    }

    if ($prev = book_prev($node)) {
      $links .= '<div class="prev">';
      $links .= l(t('previous'), 'node/' . $prev->nid, array('title' => t('View the previous page.')));
      $links .= '</div>';
      $titles .= '<div class="prev">' . check_plain($prev->title) . '</div>';
    }
    else {
      $links .= '<div class="prev">&nbsp;</div>'; // Make an empty div to fill the space.
    }
    if ($next = book_next($node)) {
      $links .= '<div class="next">';
      $links .= l(t('next'), 'node/' . $next->nid, array('title' => t('View the next page.')));
      $links .= '</div>';
      $titles .= '<div class="next">' . check_plain($next->title) . '</div>';
    }
    else {
      $links .= '<div class="next">&nbsp;</div>'; // Make an empty div to fill the space.
    }
    if ($node->parent) {
      $links .= '<div class="up">';
      $links .= l(t('up'), 'node/' . $node->parent, array('title' => t('View this page\'s parent section.')));
      $links .= '</div>';
    }

    $output .= '<div class="nav">';
    $output .= ' <div class="links">' . $links . '</div>';
    $output .= ' <div class="titles">' . $titles . '</div>';
    $output .= '</div>';
    $output .= '</div>';
  }

  $node->body = $node->body . $output;

  return $node;
}