Sort wp_nav_menu() by menu order

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I have made a custom menu handler for the back end, sorting the via a drag drop based on CMS Page Order.

The problem now is that it seems that it’s not possible to sort wp_nav_menu in any other way than the default one, can that be really be true?

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  1. The nav_menu_items are already sorted by menu_order.

    When you go into the Appearance -> Menus and arrange the order menu the menu_order of each menu item gets updated.

    To change the orderby parameter in the query that displays the menu you can use pre_get_posts to alter it. Example:

    add_action( 'pre_get_posts', 'wpse_sort_nav' );
function wpse_sort_nav( $query ) {
        if ( $query->is_main_query() && get_query_var( 'post_type' ) == 'nav_menu_item' )
            $query->set( 'orderby', 'ID' );
    }

    ID and menu_order are your only real options for sorting using the default post table. There is no title and the post_name is the same as the ID.

    You could add additional parameters to the pre_get_posts filter using the meta data stored with each nav_menu_item.

    Nav Menu metadata:

    _menu_item_menu_item_parent
    _menu_item_type
    _menu_item_object_id
    _menu_item_object
    _menu_item_target
    _menu_item_classes
    _menu_item_xfn
    _menu_item_url