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Helpful Snippets

Always show children and grandchildren under parent

/**
 * Customize the BE Subpages widget to always show the children and grandchildren
 *
 * @param array $parents
 * @return array
 */
function be_subpages_widget_parents_args( $parents ) {
	$pages =  get_pages( array( 'child_of' => $parents[0] ) );
	foreach ( $pages as $page ) {
		$parents[] = $page->ID;
	} 

	return $parents;
}
add_filter( 'be_subpages_widget_parents', 'be_subpages_widget_parents_args' );

On grandchildren, use active class on top parent items

/**
 * Mark top level as current.
 *
 * @since 1.0.0
 */
function ja_be_subpages_toplevel( $class, $subpage ) {
	global $post;
	if ( $subpage->ID == $post->post_parent ) {
		$class[] .= 'widget_subpages_current_page';
	}
	return $class;	
}
add_filter( 'be_subpages_widget_class', 'ja_be_subpages_toplevel', 10, 2 );

On Blog (is_home()), display widget. Helpful if you have nested your blog page.

/**
 * Show nav widget on home
 *
 * @since 1.0.0
 */
function ja_blog_submenu_display( $show ) {
	if ( is_home() )
		return true;

	return $show;
}
add_filter( 'be_subpages_widget_display_override', 'ja_blog_submenu_display' );

/**
 * Show nav widget on home
 *
 * @since 1.0.0
 */
function ja_blog_submenu_post( $post ) {
	if ( is_home() ) 
		$post = get_post( get_option( 'page_for_posts' ) );

	return $post;
}
add_filter( 'be_subpages_widget_override_post', 'ja_blog_submenu_post' );