How do I check if a menu exists?

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I’m currently retrieving a nav menu based on the parent page’s title, and if the page doesn’t have a parent then it’s own title.

global $post;
$page_title;

if ($post->post_parent) {
    $page_title = get_the_title($post->post_parent);
}  else {
    $page_title = get_the_title($post);
}

$sidebar_title="Sidebar - ".$page_title;
wp_nav_menu(array( 'menu' => $sidebar_title));

Instead of first checking for a parent, I’d like to first check if a page has it’s own unique menu. This is what I wrote but it doesn’t work:

global $post;
$page_title = get_the_title($post);
$sidebar_title="Sidebar - ".$page_title;

if ( !wp_nav_menu(array( 'menu' => $sidebar_title, 'echo' => false )) ) {

    $page_title = get_the_title($post->post_parent);
    $sidebar_title="Sidebar - ".$page_title;
}

wp_nav_menu(array( 'menu' => $sidebar_title ));

TLDR: How do I check if a menu exists?

2 Answers
2

Assuming that you have custom Nav Menus implemented properly:

  1. Registering nav menu Theme Locations:

    register_nav_menus( array(
    'parent_page' => "Parent Page",
    'page_a' => "Page A",
    'page_b' => "Page B", //etc
) );

  2. Calling wp_nav_menu() correctly:

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

…then you can use the has_nav_menu() conditional to determine if a Theme Location has a menu assigned to it:

if ( has_nav_menu( 'page_a' ) ) {
    // do something
}

In your specific case, you could do something like so:

if ( has_nav_menu( 'page_a' ) ) {
    wp_nav_menu( array( 'theme_location' => 'page_a' ) );
} else {
    wp_nav_menu( array( 'theme_location' => 'parent_page' ) );
}

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