Set the active Navigation Menu from a plugin

2 comments

1. You can use the wp_nav_menu_args filter ( Codex reference ) to set a theme location to use a specific menu.

   Example:

   function test_wp_nav_menu_args( $args = '' ) {
       // only set menu for the primary navigation menu.
       if ( $args['theme_location'] != 'primary' ) {
           return $args;
       }
       // change {main-menu} to be the slug of the menu you want to set.
       $args['menu'] = 'main-menu';
       return $args;
   }
   add_filter( 'wp_nav_menu_args', 'test_wp_nav_menu_args' );
   

2. You can use get_theme_mod and set_theme_mod to save nav menu locations.

   Get locations:

   $locations = get_theme_mod( 'nav_menu_locations' );
   var_dump( $locations );
   

   prints:

   Array
   (
       [primary] => 0
       [secondary] => 0
   )
   

   Get existing nav menus:

   $nav_menus = get_terms( 'nav_menu', array( 'hide_empty' => true ) );
   var_dump( $nav_menus );
   

   prints:

   Array
   (
       [0] => stdClass Object
           (
               [term_id] => 2
               [name] => Main
               [slug] => main
               [term_group] => 0
               [term_taxonomy_id] => 2
               [taxonomy] => nav_menu
               [description] => 
               [parent] => 0
               [count] => 3
           )
   }
   

   Set location:

   $nav_menu_id = $nav_menus[0]->term_id;
   $location = 'primary';
   $locations[ $location ] = $nav_menu_id;
   set_theme_mod( 'nav_menu_locations', $locations );
   

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