Hi,
I come across same issue as @highkat. I found http://www.elliotcondon.com/conditional-logic-for-advanced-custom-fields/ really helpful. In order to make it work with most recent version of ACF you’ll have to use acf/input/admin_footer hook instead of acf_head-input described in the article and use acf.add_action('ready', function() { instead of $(document).on('acf/setup_fields'... (see: https://www.advancedcustomfields.com/resources/adding-custom-javascript-fields/)
I know that this is an old question but I think that it might be useful for someone.
