Add body class of category parent

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I am not a coder, but I usually get by with WordPress by doing my research and find my solution. I can’t find what I need to do this time so I have attempted to crib together some code – what I am attempting to do is, when I am on the Category Archive, I want to add a body class of the category parent. This is what I have tried and it is working apart from I am getting the parents category ID, but I want the slug/nicename:

add_filter('body_class','hw_custom_body_class');
  function hw_custom_body_class($classes){
  if(is_category()){
  $categories = get_the_category();
  $category = strtolower($categories[0]->category_parent);
  $classes[]='category-'.$category;
  return $classes;    }}

2 Answers
2

Use get_ancestors() to get the parent terms. Here is an excerpt from my plugin T5 Parent Terms in body_class:

    $ancestors = get_ancestors(
        get_queried_object_id(),
        get_queried_object()->taxonomy
    );

    if ( empty ( $ancestors ) )
    {
        return $classes;
    }

    foreach ( $ancestors as $ancestor )
    {
        $term          = get_term( $ancestor, get_queried_object()->taxonomy );
        $new_classes[] = esc_attr( "parent-$term->taxonomy-$term->slug" );
    }

This will work with any taxonomy, not just categories.

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