Dynamic WP Custom Fields

Hey westefan,

Thank you for the inquiry.

What do you mean by “dynamic WP custom fields”? If you want to display the subcategories of a specific parent category, you can try this shortcode in the functions.php file:

function av_display_product_subcategories_shortcode( $atts ) {
    $atts = shortcode_atts( array(
        'category_id' => '',
    ), $atts, 'display_subcategories' );
    
    $category_id = intval( $atts['category_id'] );
    
    if ( !$category_id ) {
        return 'Please provide a valid main category ID.';
    }
    
    $args = array(
        'taxonomy'     => 'product_cat',
        'parent'       => $category_id,
        'hide_empty'   => false,
    );
    
    $subcategories = get_terms( $args );
    
    if ( empty( $subcategories ) || is_wp_error( $subcategories ) ) {
        return 'No subcategories found for this category.';
    }
    
    $output = '<ul>';
    
    foreach ( $subcategories as $subcategory ) {
        $output .= '<li>' . esc_html( $subcategory->name ) . '</li>';
    }
    
    $output .= '</ul>';
    
    return $output;
}

add_shortcode( 'av_display_subcategories', 'av_display_product_subcategories_shortcode' );

You can use the shortcode in a Text or Code Block element.

[av_display_subcategories category_id="123"]

Best regards,
Ismael

Hi,

If you want to show subcategories for which a specific product belongs, try replacing the shortcode with this:

function av_display_product_subcategories_shortcode( $atts ) {
    if ( ! is_product() ) {
        return 'This shortcode can only be used on product pages.';
    }

    global $product;

    $terms = wp_get_post_terms( $product->get_id(), 'product_cat' );

    if ( empty( $terms ) || is_wp_error( $terms ) ) {
        return 'No categories found for this product.';
    }

    $category = $terms[0];

    $args = array(
        'taxonomy'     => 'product_cat',
        'parent'       => $category->term_id,
        'hide_empty'   => false,
    );

    $subcategories = get_terms( $args );

    if ( empty( $subcategories ) || is_wp_error( $subcategories ) ) {
        return 'No subcategories found for this category.';
    }

    $output = '<ul>';

    foreach ( $subcategories as $subcategory ) {
        $output .= '<li>' . esc_html( $subcategory->name ) . '</li>';
    }

    $output .= '</ul>';

    return $output;
}

add_shortcode( 'av_display_subcategories', 'av_display_product_subcategories_shortcode' );

You can then use the shortcode in a product like so:

[av_display_subcategories]

Unfortunately, you cannot use the dynamic content for this.

Best regards,
Ismael

Hi,

I meant only subcategories a certain product is assigned to

The latest modification can only be used on product pages as per your request above. Where are you trying to use the shortcode?

Best regards,
Ismael

Hi,

Thank you for the clarification.

We edited the shortcode a bit and added the parent_category parameter:

function av_display_product_subcategories_shortcode( $atts ) {
    $atts = shortcode_atts( array(
        'parent_category' => '',
    ), $atts, 'av_display_subcategories' );

    if ( ! is_product() ) {
        return 'This shortcode can only be used on product pages.';
    }

    global $product;

    if ( ! empty( $atts['parent_category'] ) ) {
        $category = get_term_by( 'slug', sanitize_title( $atts['parent_category'] ), 'product_cat' );
        if ( ! $category ) {
            $category = get_term( (int) $atts['parent_category'], 'product_cat' );
        }
    } else {
        $terms = wp_get_post_terms( $product->get_id(), 'product_cat' );
        if ( empty( $terms ) || is_wp_error( $terms ) ) {
            return 'No categories found for this product.';
        }
        $category = $terms[0];
    }

    if ( ! $category || is_wp_error( $category ) ) {
        return 'No valid parent category found.';
    }

    $args = array(
        'taxonomy'     => 'product_cat',
        'parent'       => $category->term_id,
        'hide_empty'   => false,
    );

    $subcategories = get_terms( $args );

    if ( empty( $subcategories ) || is_wp_error( $subcategories ) ) {
        return 'No subcategories found for this category.';
    }

    $output = '<ul>';

    foreach ( $subcategories as $subcategory ) {
        $output .= '<li>' . esc_html( $subcategory->name ) . '</li>';
    }

    $output .= '</ul>';

    return $output;
}

add_shortcode( 'av_display_subcategories', 'av_display_product_subcategories_shortcode' );

You can use the shortcode like so:

[av_display_subcategories parent_category="123"]

or

[av_display_subcategories parent_category="parent-category-slug"]

Best regards,
Ismael

Hi,

Thank you for the info.

We updated the code again and added a filter so that only subcategories where the product belongs are included.

function av_display_product_subcategories_shortcode( $atts ) {
    $atts = shortcode_atts( array(
        'parent_category' => '',
    ), $atts, 'av_display_subcategories' );

    if ( ! is_product() ) {
        return 'This shortcode can only be used on product pages.';
    }

    global $product;

    if ( ! empty( $atts['parent_category'] ) ) {
        $parent_category = get_term_by( 'slug', sanitize_title( $atts['parent_category'] ), 'product_cat' );
        if ( ! $parent_category ) {
            $parent_category = get_term( (int) $atts['parent_category'], 'product_cat' );
        }
    }

    if ( ! $parent_category || is_wp_error( $parent_category ) ) {
        return 'No valid parent category found.';
    }

    $product_terms = get_the_terms( $product->get_id(), 'product_cat' );

    if ( empty( $product_terms ) || is_wp_error( $product_terms ) ) {
        return 'No categories found for this product.';
    }

    $filtered_terms = [];
    foreach ( $product_terms as $term ) {
        if ( $term->parent == $parent_category->term_id ) {
            $filtered_terms[] = $term;
        }
    }

    if ( empty( $filtered_terms ) ) {
        return 'No subcategories found for this product under the specified parent category.';
    }

    $output = '<ul>';
    foreach ( $filtered_terms as $subcategory ) {
        $output .= '
 	<li>' . esc_html( $subcategory->name ) . '</li>';
    }
    $output .= '</ul>';

    return $output;
}

add_shortcode( 'av_display_subcategories', 'av_display_product_subcategories_shortcode' );

Best regards,
Ismael

Hi,

Great! Glad to know that the solution is working. Please feel free to open another thread if you have more questions about the theme.

Have a nice day.

Best regards,
Ismael