wp_nav_menu find next, previous links

2 comments

1. Ok, here’s what I came up with – and it works.

   <?php
   $menu_name = 'main-menu';
   $locations = get_nav_menu_locations();
   $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );
   $menuitems = wp_get_nav_menu_items( $menu->term_id, array( 'order' => 'DESC' ) );
   
   $i=-1;
   foreach ( $menuitems as $item ):
   
       $i++;
   
     $id = get_post_meta( $item->ID, '_menu_item_object_id', true );
     $page = get_page( $id );
     $link = get_page_link( $id );
   
       $linkarray.=$id.",";
       $urlarray.=$link.",";
   
     if ($id==$post->ID){
       $previd=$i-1;
       $nextid=$i+1;
     }
   endforeach;
   
   $linkarray=explode(',',$linkarray);
   $urlarray=explode(',',$urlarray);
   
   $nextid=$urlarray[$nextid];
   if (empty($nextid)){
       $nextid=$urlarray[0];
   }
   $previd=$urlarray[$previd];
   if (empty($previd)){
       $previd=$urlarray[$i];
   }
   ?>
   
   <a href="<?php echo $nextid; ?>">Next Item</a>
   <a href="<?php echo $previd; ?>">Previous Item</a>
   

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2. I adapted the previous answer, to include any post items in a menu (not just pages).
   This code returns the previous and next post IDs.

   <?php
   $current_post_id = $post->ID;
   $menu_name = 'guide-menu-frontpage';
   $locations = get_nav_menu_locations();
   $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );
   $menuitems = wp_get_nav_menu_items( $menu->term_id, array( 'order' => 'DESC' ) );
   $i = 0;
   
   foreach ( $menuitems as $item ){
       $menuitems_id_array[] = $item->object_id;
       if ($item->object_id == $current_post_id){
           $prevMenuPosition = $i - 1;
           $nextMenuPosition = $i + 1;
       }
       $i++;
   }
   
   if($prevMenuPosition < 0){
       $prev_id = false;
   } else {
       $prev_id = $menuitems_id_array[$prevMenuPosition];
   }
   
   if($nextMenuPosition > sizeof($menuitems_id_array) - 1){
       $next_id = false;
   } else {
       $next_id = $menuitems_id_array[$nextMenuPosition];
   }
   ?>
   

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