Determine what level of the menu hierarchy a page is on
Task · How to determine menu hierarchery level · Developers and coders · Themers · Drupal 6.x · No known problems
Last modified: August 26, 2009 - 22:05
Description
Often, you need to know if a page (node, view or otherwise) has a menu item, and if so, what "level" of the menu it is on (level 1 being the top level menus, level 2 being the sub-menus, level 3 being the sub-sub menus etc). Once you determine this, you can style pages differently depending on their menu level.
<?php
// Fetch the menu tree for the current page.
$tree = menu_tree_page_data('primary-links');
$level = 0;
// Go down the active trail as far as possible.
while ($tree) {
// Loop through the current level's items until we find one that is in trail.
while ($item = array_shift($tree)) {
if ($item['link']['in_active_trail']) {
// If the item is in the active trail, we count a new level.
$level++;
if (!empty($item['below'])) {
// If more items are available, we continue down the tree.
$tree = $item['below'];
break;
}
// If we are at the end of the tree, our work here is done.
break 2;
}
}
}
// Then, add body classes or other theme variables as needed:
if ($level <= 2) {
$vars['body_classes'] .= ' landing';
}
if ($level) {
$vars['body_classes'] .= ' menu-level-' . $level;
}
?>Notes
- If you use another menu than "Primary Links" here, enter the menu name or ID instead of 'primary-links'.
- The $vars['body_classes'] part assumes that this code is placed in your theme_preprocess_page() function in template.php, however the main logic should work pretty much anywhere.
- This snippet will return 0 (zero) if the current page has no menu item in the requested menu - note that this can include the front page of the site. It is recommended that you use $vars['front_page'] (already generated) to specifically check for the front page.