Hi @sasori390,
I think this should just about do it.. this can be used outside of the loop which I assume you are doing. If not you could probably remove the global $post.
<?php
global $post;
if($post->post_parent){
$postid = $post->post_parent;
}else{
$postid = $post->ID;
}
?>
<?php if(get_field('content-container', $postid)): ?>
<ul>
<?php while(has_sub_field('content-container', $postid)): ?>
<li><a href="<?php the_permalink() ?>#<?php the_sub_field('anchor'); ?>"><?php the_sub_field('header'); ?></a></li>
<?php endwhile; ?>
</ul>
<?php endif; ?>
