I get this error when there are no menus defined or no menus set for the location at Appearance->Menus. When that occurs wp_nav_menu uses a page walker fallback. The fallback (default) for wp_nav_menu is wp_walker_page which uses wp_page_menu which uses wp_list_pages which uses walk_page_tree which uses Walker_Page not Walker_Nav_Menu. And apparently the two walkers are … Read more
You don’t need a walker in this case. A filter called wp_nav_menu_items is available. It allows you to edit the list items of a menu. Just append your own list item with search field. add_filter( ‘wp_nav_menu_items’, ‘add_search_to_nav’, 10, 2 ); function add_search_to_nav( $items, $args ) { $items .= ‘<li>SEARCH</li>’; return $items; } Note: if you … Read more
If you look at implementation of WP_Nav_Menu_Widget class you will see the following code: function widget($args, $instance) { // Get menu $nav_menu = ! empty( $instance[‘nav_menu’] ) ? wp_get_nav_menu_object( $instance[‘nav_menu’] ) : false; if ( !$nav_menu ) return; $instance[‘title’] = apply_filters( ‘widget_title’, empty( $instance[‘title’] ) ? ” : $instance[‘title’], $instance, $this->id_base ); echo $args[‘before_widget’]; if … Read more
This is the walker I used to display only children of the current menu item. Or the menu items siblings if it doesn’t have any children of its own. There are comments throughout the class explaining each section <?php class SH_Child_Only_Walker extends Walker_Nav_Menu { private $ID; private $depth; private $classes = array(); private $child_count = … Read more
Using a custom Walker, the start_el() method has access to $depth param: when it is 0 the elemnt is a top one, and we can use this info to maintain an internal counter. When the counter reach a limit, we can use DOMDocument to get from full HTML output just the last element added, wrap … Read more
I just had to do this in one of my themes… Since you don’t have access to the $item variable at that stage of the Walker, you would want to store your current item in a more global scope at the moment you do have access to it. The following code will make more sense… … Read more
You need a custom walker for the nav menu. Basically, you add a parameter ‘walker’ to the wp_nav_menu() options and call an instance of an enhanced class: wp_nav_menu( array ( ‘menu’ => ‘main-menu’, ‘container’ => FALSE, ‘container_id’ => FALSE, ‘menu_class’ => ”, ‘menu_id’ => FALSE, ‘depth’ => 1, ‘walker’ => new Description_Walker ) ); The … Read more