A "book-like" navigation block
A recent client site, which I was building with Drupal, needed a more conventional navigation system. Specifically, we needed a 'block' to do for regular pages what the book navigation block does for book.module - list the categories in a taxonomy, and show a sublist of that category when you either click on the category name, or access a page which is inside that category.
Here it is. I've used the "collapsed","expanded" and "leaf" list classes to make it all fit neatly into Drupal's default style.
One caveat: It assumes a flat term hierarchy and nodes attached to more than one taxonomy term will be assumed to be a member of only one of them.
Copy and paste this code into a new PHP block, and make a couple of locally-relevant changes (read the comments for details).
<?php
switch (arg(0)) {
case 'node':
$current = arg(1);
// Note: Change the '7' below to whatever vocabulary ID you're using
$cats = taxonomy_node_get_terms_by_vocabulary($current, 7);
foreach ($cats as $cat) {
$mycategory = $cat->tid;
}
break;
case 'taxonomy':
$current = 0;
$mycategory = arg(2);
break;
default:
$current = 0;
$mycategory = 0;
break;
}
// Note: Change the '7' below to whatever vocabulary ID you're using
$terms = taxonomy_get_tree(7);
?>
<div class="menu">
<ul>
<?php
foreach($terms as $term) {
$looptid = $term->tid;
$loopname = $term->name;
if($looptid == $mycategory) {
print '<li class="expanded"><a href="/taxonomy/term/'. $looptid .'">'. $loopname .'</a><ul>';
$kiddies = taxonomy_select_nodes(array($mycategory), 'or', 0, FALSE, 'n.title ASC, n.sticky DESC');
if (db_num_rows($kiddies) > 0) {
while ($getthem = db_fetch_object($kiddies)) {
print '<li class="leaf"><a href="/node/"'. $getthem->nid .'">'. $getthem->title .'</a></li>';
}
}
print '</ul>';
print '</li>';
}
else {
print '<li class="collapsed"><a href="/taxonomy/term/'. $looptid .'">'. $loopname .'</a></li>';
}
}
?>
</ul>
</div>You can make it link to path aliases by using the drupal_get_path_alias function:
replace
<?php
print '<li class="expanded"><a href="/taxonomy/term/'. $looptid .'">'. $loopname .'</a><ul>';
?>with
<?php
print '<li class="expanded"><a href="/'. drupal_get_path_alias('taxonomy/term/$looptid') .'">'. $loopname .'</a><ul>';
?>and
<?php
print '<li class="collapsed"><a href="/taxonomy/term/'. $looptid .'">'. $loopname .'</a></li>';
?>with
<?php
print '<li class="collapsed"><a href="/'. drupal_get_path_alias('taxonomy/term/$looptid') .'">'. $loopname .'</a><ul>';
?>and for the nodes themselves
<?php
print '<li class="leaf"><a href="/node/'. $getthem->nid .'">'. $getthem->title. '</a></li>';
?>with
<?php
print '<li class="leaf"><a href="/'. drupal_get_path_alias('node/$getthem->nid') .'">'. $getthem->title .'</a></li>';
?>