Topic: Excluding page categories in Post Navigation element

October 25, 2024 at 4:45 am

Hi! I am using both pages and posts for creating content in my webpage, so I use the post navigation element in both.

I have created a category (slug is “interno” and category ID is 1370) which contains some pages I don’t want to show in post navigation element (such as cookies policy, legal information…).

I have tried adding some code I found in this forum to hide that category, but it`s not working. This is the code I added to functions.php:

/**
 * Remove Post Navigation in categories
 */
add_action('after_setup_theme', function() {
    add_filter('generate_category_post_navigation', function($display) {
        // List of category slugs to exclude
        $excluded_slugs = ['interno'];

        // Get the current post's category slugs
        $post_categories = get_the_category();
        $post_slugs = wp_list_pluck($post_categories, 'slug');

        // Check if the current post is in any of the excluded categories
        $is_excluded = !empty(array_intersect($excluded_slugs, $post_slugs));

        // If the post is in an excluded category, return false to disable navigation
        // Otherwise, return the original value
        return $is_excluded ? false : $display;
    });
});

It’s not working so far so I need to Know what I am doing wrong. Thank you in advance!

David

October 25, 2024 at 7:19 am

Hi there,

that code will only work with the themes default post navigation.
And I am not 100% sure on how this will work with an element – but you could try this:


add_filter('get_previous_post_where', 'exclude_category_from_adjacent_posts');
add_filter('get_next_post_where', 'exclude_category_from_adjacent_posts');

function exclude_category_from_adjacent_posts($where) {
    $where .= " AND p.ID NOT IN (SELECT object_id FROM wp_term_relationships WHERE term_taxonomy_id = YOUR_CATEGORY_ID)";
    return $where;
}

Replace the YOUR_CATEGORY_ID with the ID .

SM
October 25, 2024 at 10:38 am

Hi David,

Unfortunately, the code you provided is not working either.

Yes, I want to exclude a category of pages from showing in the default post navigation ( this: Block Element – Post Navigation).

Can you please provide me with the correct code?

Ying

October 25, 2024 at 10:58 am

A block element – post navigation is not the default post navigation of the theme.

However, give this code a try:

add_filter('get_previous_post_where', 'exclude_category_from_adjacent_posts');
add_filter('get_next_post_where', 'exclude_category_from_adjacent_posts');

function exclude_category_from_adjacent_posts($where) {
    // Get the term ID of the "interno" category
    $exclude_category_id = get_cat_ID('interno'); // Replace 'interno' with your category slug if needed

    // Add condition to exclude posts in the "interno" category
    if ($exclude_category_id) {
        global $wpdb;
        $where .= " AND p.ID NOT IN (SELECT object_id FROM {$wpdb->term_relationships} WHERE term_taxonomy_id = {$exclude_category_id})";
    }

    return $where;
}

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Excluding page categories in Post Navigation element