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Wordpress :: Highlight menu item when a single custom post or a post from a category is shown
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What's that?
WordPress does NOT automatically assign a menu highlight class on custom single-posts when you insert the custom menu with wp_nav_menu(). For this we wrote the following simple function as a hook within functions.php.
The solution
Add the following code to your functions.php and be happy:
/* function to add classes to active menu entries */
function add_active_class_to_custom_posts($classes = array(), $menu_item = false){
global $wp_query;
$post_name = $menu_item->post_name;
$post_type = get_post_type();
/* Highlight the current menu item if the category-parent of the current posts' category equals to the menu name.
* This is usually the case when you set a category as custom menu item and use wp_nav_menu() to display that */
$query_var = get_query_var('cat');
if ($query_var) {
$current_category = get_category($query_var);
$root_categoryObj = get_category($current_category->parent, false);
$root_categoryName = strtolower(($root_categoryObj->name));
if (strcasecmp($post_name, $root_categoryName) == 0) $classes[] = 'current-menu-item';
}
/* assign 'current-menu-item' to regular posts; that's the default behaviour we just copy here */
if(in_array('current-menu-item', $menu_item->classes)){
$classes[] = 'current-menu-item';
}
else {
/* assign the 'current-menu-item' class to all custom posts */
if ($post_name == $post_type) {
$classes[] = 'current-menu-item';
}
}
return $classes;
}
add_filter( 'nav_menu_css_class', 'add_active_class_to_custom_posts', 10, 2 );