Overriding the currently selected menu item

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I have a WP 3.x site that I’m using mainly as a CMS. The menu links to the various WordPress pages.

One of the pages, “News”, is the “posts” page.

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However, when clicking on one of the posts on the News page, the “News” item in the menu loses highlighting because the post isn’t treated as a child of “news”.

Is there an easy way to override the currently highlighted item in the menu? Ideally by forcing a page ID upon it.

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  1. Since I assume you’re using wp_nav_menu(), there should be a class current_page_parent which is applied to your posts’ page menu item when viewing a single post.

    You can use this class to style the ‘active’ state, much like you’re probably doing with current_page_item at the moment.

    If (for whatever reason) you must have current_page_item added too, you can filter the nav_menu_css_class:

    /**
 * Add the class 'current_page_item' to 'page for posts' menu item if we're
 * viewing a single post.
 * 
 * @param array $class
 * @param object $item The current menu item.
 * @return array
 */
function add_current_class_to_posts_page( $classes, $item )
{
    static $posts_page;

    if ( ! is_single() )
        return $classes;

    if ( ! isset( $posts_page ) )
        $posts_page = get_option( 'page_for_posts' ); // cache as we may be calling this a lot!

    if ( $item->object == 'page' && $item->object_id == $posts_page )
        $classes[] = 'current_page_item'; // this is the posts page!

    return $classes;
}
add_filter( 'nav_menu_css_class', 'add_current_class_to_posts_page', 10, 2 );