display rule for pages – parent + sub pages

Hi,

There’s no native “child pages of X” condition in GP Elements Display Rules — you’d need to either add each child page manually (which doesn’t scale) or use a small PHP snippet to extend the logic.

Add this via a Code Snippets plugin or your child theme’s functions.php:

add_filter( 'generate_element_display', function( $display, $element_id ) {
    if ( 123 === $element_id && is_singular( 'page' ) ) {
        $ancestors = get_post_ancestors( get_the_ID() );
        if ( in_array( 456, $ancestors, true ) ) {
            $display = true;
        }
    }
    return $display;
}, 10, 2 );

Replace 123 with your Content Layout Element’s ID and 456 with the parent page’s ID. Keep the parent page itself in the Element’s Display Rules as normal — the snippet only adds coverage for its descendants.