Change menu items URL

I create a single page website and use only anchors (#) on main menu items.

Now, I need to include a second page on the website and keep the same menu.

I’m using roots theme. Then, I’m building menu using:

wp_nav_menu(array('theme_location' => 'primary_navigation')); 

But how to change items url from, for example, #contact to mywebsite.com.br/#contact only on this second page?

Solutions Collecting From Web of "Change menu items URL"

In your template you can check whether you’re on the front-page or not and then echo out a different menu.

For example:

if(is_front_page() || is_home()){

 wp_nav_menu(array('theme_location' => 'primary_navigation'));

}else{

 wp_nav_menu(array('theme_location' => 'secondary_navigation'));

}

You would also have to register a second menu locations in the functions.php file (if it hasn’t been done yet).

To register a new menu location:

function register_my_menus() {

    register_nav_menus(array( 
        'secondary-location' => __('Secondary Location'),
    ));

}

add_action( 'init', 'register_my_menus' );

The downside is that you would have to manage two menus in the backend. That could be a problem if the menu changes often, because you would have to update two menus.

Instead, you could filter the wp_nav_menu and alter the url before the menu is printed. For example, this would go in functions.php

function change_menu($items){

if(!is_front_page()){

  foreach($items as $item){


    $item->url = get_bloginfo("url") . "/" .  $item->url;


  }

}

  return $items;

}

add_filter('wp_nav_menu_objects', 'change_menu');

the code above filters the wp_nav_menu_object. It adds the full url if you’re not on the front-page of the website. Otherwise it just returns the regular menu. Using this method you would not have to create a second menu in the admin.

I’d been using a modified version of gdaniel’s solution, but recently ran into an issue where, when using custom menu links to point menu items to external links, the site URL was prepended to the external link.

The code below should work if you need to modify anchor links and not modify external links.

function lb_menu_anchors($items, $args) {
    foreach ($items as $key => $item) {
        if ($item->object == 'custom' && substr($item->url, 0, 1) == '#') {
            $item->url = site_url() . $item->url;
        }
    }

    return $items;
}
add_filter('wp_nav_menu_objects', 'lb_menu_anchors', 10, 2);

All props go to laubsterboy and faye:
https://laubsterboy.com/blog/2014/09/wordpress-menu-anchor/
https://laubsterboy.com/blog/2014/09/wordpress-menu-anchor/#comment-35170