wp_nav_menu() not working on Custom Search Page

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I’m using WP Custom Search plugin to generate Advanced Search in one of my newly developed WP site. Though the plugin is not completely bug-free, but it’s working just fine (excepts some Undefined Offset warnings, I’m ignoring them for its better support in searching).

But recently noticed that the wp_nav_menu() on the header.php is not working when I’m on the search page. It’s a simple code as it’s used in many of my WP sites:

<?php wp_nav_menu( array( 'theme_location' => 'header_menu', 'menu_class' => 'site-header-menu' ) ); ?>

That’s working on all other pages, BUT the search.php – a typical search template.

I’ve tried the most-cited solution from:

  • this WP Support thread — failed,
  • this SO Thread — failed, and
  • this WPSE thread — failed

Typically the search page contains a ?s= on the URL, but using this plugin, I’m getting:

http://example.com/?search-class=DB_CustomSearch_Widget-db_customsearch_widget&widget_number=preset-1&[search_queries_and_conditions]=&search=Search

Is that a cause I’m failing echoing the menu? (Live site here, and the Advanced Search is on the left)

2 Answers
2

I know this is an old thread but the problem still exists. I think this is a bug. Default queries such as nav should not be affected in making custom search page. Anyways, this is how I fixed it:

function fix_nav_menu_in_search($query)
{
    if (is_search()) {
        $query->set('post_type', ['your_cpt', 'nav_menu_item']);
    }

    return $query;
}
add_filter('pre_get_posts', 'fix_nav_menu_in_search');

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