Custom markup with wp_nav_menu based on pages

3 comments

1. The only way that I could think to do this would be to add a filter to wp_nav_menu_items. Here is the code that I got to work (just add it to your themes functions.php file):

   add_filter('wp_nav_menu_items', 'my_id_name_nav', 10, 2);
   function my_id_name_nav($items,$args) {
     if( $args->theme_location == 'primary' ) {
       preg_match_all('/<li id="menu-item-([0-9]+)"([^>]+)>s*<a href="([^"]+)">([^<]+)</a></li>/i', $items, $matches);
       $newItems = array();
       for($i=0; $i<count($matches[0]); $i++){
         $short = explode('/', $matches[3][$i]);
         $short = $short[count($short) - 2]; // if there is no trailing slash, subtract 1 instead of 2
         array_push($newItems, '<li id="menu-item-'. $short .'"'. $matches[2][$i] .'><a href="'. $matches[3][$i] .'">'. $matches[4][$i] .'</a></li>');
       }
       return implode('', $newItems);
     } else {
       return $items;
     }
   }
   

   It uses the last part of the url to create the page name for the id. So menu-item-2 for http://yoursite.com/page1/page2/ would become menu-item-page2.

   The if( $args->theme_location == 'primary' ) is for targeting a specific menu. If you want to do this for all menus just remove the if else statement.

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2. Very Simple … Use a Custom Walker … All you need to do is attach something constant to the id element … such as the actual post or page id … That’s in the menu_item->object_id … I don’t really see why your doing this though … with a cursory knowledge of CSS you can easily utilize the cascade to address an items children … All the menu_items are already assigned css classes … @see the Codex

   $args = array (
   
   'theme_location'  => 'primary',
   'menu'            => 'Menu Name',
   'container'       => 'div',
   'container_class' => 'nav',
   'container_id'    => FALSE,
   'menu_class'      => FALSE,
   'menu_id'         => FALSE,
   'echo'            => TRUE,
   'fallback_cb'     => 'wp_page_menu',
   'before'          => FALSE,
   'after'           => FALSE,
   'link_before'     => FALSE,
   'link_after'      => FALSE,
   'items_wrap'      => "nt" . '<ul>%3$s</ul>' . "n",
   'depth'           => 0,
   'walker'          => new ID_Walker()
   );
   
   wp_nav_menu( $args );
   
   class ID_Walker extends Walker_Nav_Menu {
   
   function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
       global $wp_query;
       $indent = ( $depth ) ? str_repeat( "t", $depth ) : '';
   
       $class_names = $value = '';
   
       $classes = empty( $item->classes ) ? array() : (array) $item->classes;
       $classes[] = 'menu-item-' . $item->ID;
   
       $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
       $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
   
       $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
   
               /** 
               * Add the object id as a reference
               * This will tie your menu_item id ref to your post page or cpt
               */  
   
       $oid = esc_attr( $item->object_id ); 
   
               /**
               * Append the object id to the element id  
               */
   
       $id = $id ? ' id="' . esc_attr( $id ) . '-' . $oid . '"' : '';
   
       $output .= $indent . '<li' . $id . $value . $class_names .'>';
   
       $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
       $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
       $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
       $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
   
       $item_output = $args->before;
       $item_output .= '<a' . $attributes .'>';
       $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
       $item_output .= '</a>';
       $item_output .= $args->after;
   
       $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
       }
   }
   

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3. You can just add a custom function to the nav_menu_item_id hook that does something like this:

   function custom_nav_menu_item_id($menu_id, $item, $args, $depth) {
       if ($item) {
           switch ($item->object) {
               case "page":
                   // If the menu item's object is a page,
                   // retrieve it and return its name.
                   $post = get_post($item->object_id);
                   return $post->post_name;
   
               case "category":
                   // If the menu item's object is a category,
                   // retrieve it and return its slug.
                   $category = get_category($item->object_id);
                   return $category->slug;
           }
       }
   
       // Return the standard menu id by default.
       return $menu_id;
   }
   
   add_filter('nav_menu_item_id', 'custom_nav_menu_item_id', 10, 2);
   

   If there are more menu item types than page and category, it’s easy to add case blocks for each of them.

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