根据页面突出显示侧栏中的链接

I'm building a sidebar nav that tracks where you are on the site. I have a drop down menu that expands when you hover on it. I want the link in the navbar to highlight to indicate which page you are on. I have it working for the parent pages, but if you hover on the dropdown and select a child link, then that link does not highlight and does not auto expand the menu to show you you're on that page. I'm building a sidebar nav that tracks where yo