edmin

The above appears a little overcomplicated; a slimmer version would be:

// highlight active custom post page in nav
add_filter( 'nav_menu_css_class', 'namespace_menu_classes', 10, 2 );
function namespace_menu_classes( $classes , $item ){
	if ( get_post_type() == 'YOUR_CUSTOM_POST_TYPE' ) {
		// remove unwanted classes if found
		$classes = str_replace( 'current_page_parent', '', $classes );
		// find the url you want and add the class you want
		if ( $item->url == '/PATH_TO_YOUR_ARCHIVE' ) {
			$classes = str_replace( 'menu-item', 'menu-item current_page_parent', $classes );
		}
	}
	return $classes;
}

Once you change YOUR_CUSTOM_POST_TYPE to the machine name of your custom post name, this should add the class ‘current_page_parent’ to your active custom post menu item, and remove the same class from any other menu items.

Also, change ‘/PATH_TO_YOUR_ARCHIVE’ to the actual path of your archive.

For example, in the below I have a custom post type called ‘Children’s Books’, and set up the post type like so (in functions.php):

add_action( 'init', 'create_post_type' );
function create_post_type() {
	register_post_type( 'childrens_books',
		array(
			'labels' => array(
				'name' => __( 'Children's Books' ),
				'singular_name' => __( 'Children's Book' )
			),
		'public' => true,
		'has_archive' => true,
		'rewrite' => array('slug' => 'childrens-books'),
		)
	);
}

In order for the menu items to highlight properly I would use the following (again, in functions.php):

// highlight active custom post page in nav
add_filter( 'nav_menu_css_class', 'namespace_menu_classes', 10, 2 );
function namespace_menu_classes( $classes , $item ){
	if ( get_post_type() == 'childrens_books' ) {
		// remove unwanted classes if found
		$classes = str_replace( 'current_page_parent', '', $classes );
		// find the url you want and add the class you want
		if ( $item->url == '/childrens-books' ) {
			$classes = str_replace( 'menu-item', 'menu-item current_page_parent', $classes );
		}
	}
	return $classes;
}

Yep, seeing the same issue

Hi all,

I have found that simply leaving a leading slash ‘/’ on your upload URL will cause this problem.

Settings > Miscellaneous > Store uploads in this folder

Make sure this is set to:

wp-content/uploads

and not

/wp-content/uploads

Hope that helps someone!