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I am working for a client that has requested a drop down list for some categories within a page, i.e. click on the link and a list drops down to select the page you want to view. Everything I seem to be finding is telling me how to create the drop down in the nav bar, that is not what I need. Any help is greatly appreciated...

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I'm not sure if you have pages with categories, but I can show you a example using posts instead.

Dropdown Filter from posts by category:

<?php

    $url = get_home_url();
    $category_slug = 'my-new-category'; //remember to get the slug


    $posts_by_category = new WP_Query([
        'post_type' => 'post',
        'category_name' => $category_slug,
        'nopaging' => true
    ]);


    if ( $posts_by_category->have_posts() ) :
        $dropdown = '<select onchange="window.location.href = this.value" name="posts-by-category">';

        while ( $posts_by_category->have_posts ) : $posts_by_category->the_post();

            $dropdown .= sprintf('<option value="%s?p=%s">%s</option>', $url, get_the_ID(), get_the_title() );

        endwhile;

        $dropdown .= '</select>';

    endif; wp_reset_postdata();

    echo $dropdown;

?>
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