How to dynamically change the color of the selected menu item of a web page?

Question

I am new to developing web pages. I am looking to create menus similar to the ones in stackoverflow.com (like Questions, Tags, Users shown above). How do I change the color

Answer 1

Set the styles for class active and hover:

---

Than you need to make the li active, on the server side. So when you are drawing the menu, you should know which page is loaded and set it to:

 
Question
 
Tags
 
Users

But if you are changing the content without reloading, you cannot change set the active li element on the server, you need to use javascript:

Item 1
Item 2
Item 3
Item 4
Item 5
Item 6