wp_nav_menu not appearing for a couple pages

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I solved the problem with the page, the correct answer is ptriek’s comment below.

Well I’m having a bit of an odd problem here, wp_nav_menu works on all pages EXCEPT my category pages (probably my archive page too but there’s no links on the website to the archive pages so that’s alright).

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Although there is archive.php in my theme files, this controls what is displayed on category, tag, archive, author, etc. pages.

I just don’t understand why, since every page uses the same header.php to display wp_nav_menu, it won’t show up for the category pages.

Am I overlooking something? I’ve been banging my head against my keyboard trying to figure this out and it just won’t work!

Using a very simple code: <?php wp_nav_menu('container_class=menu-header&theme_location=primary'); ?>

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4 comments

  1. I had the same problem, but with a newer version of WordPress (3.7.1).

    On pages with custom taxonomies of custom posts, the wp_nav_menu was not shown. The solution below worked for me.

    in functions.php of the theme:

    add_action( 'pre_get_posts', 'my_pre_get_posts' );
function my_pre_get_posts($query) {
  if ($query->get('post_type') === 'nav_menu_item') {
    $query->set('tax_query','');
  }
}

  2. Implode’s answer is right and helped me a lot. I tried to implement a hook (pre_get_posts) for avoiding to display posts of subcategories. My hook worked well despite of no more Nav-Menus.

    So, when change the tax_query you have to avoid doing this for the query with post_type == 'nav_menu_item'.

  3. Answer by Implode solve issue only if you are not using other queries like ‘meta_key’ even . I found complete solution here.

    function fix_nav_menu( $query ) {
    if ( $query->get( 'post_type' ) === 'nav_menu_item' ) {
        $query->set( 'tax_query', '' );
        $query->set( 'meta_key', '' );
        $query->set( 'orderby', '' );
    }
}

add_action( 'pre_get_posts', 'fix_nav_menu' );

  4. This one works for me. The answer found in this link on the second last post/comment: https://wordpress.org/support/topic/wp-nav-menu-dissapears-in-category-pages-1/?replies=15#post-1859168

    Just need to add this on the theme’s function.php file

    add_filter('pre_get_posts', 'query_post_type');
function query_post_type($query) {
  if(is_category() || is_tag()) {
    $post_type = get_query_var('post_type');
    if($post_type)
        $post_type = $post_type;
    else
        $post_type = array('nav_menu_item','post','articles');
    $query->set('post_type',$post_type);
    return $query;
    }
}