How Do I know my site is not running on another tab in a same browser?

Question

How Do I know my site is not running on another tab in a same browser? Any function or script exist which is give me how many tab has running my site in a same browser?

Answer 1

1. Page loads
   • Store a value in a cookie
2. Page unloads
   • Remove cookie

If at step 1. the cookie already exists then do what you need to do ;)

Very basic and naive solution!

I think there is a way to do cross tab communication, but I can't remember what it's called... or maybe i'm dreaming.

Edit: The localStorage change event might also be of help

Answer 2

You could check is a session variable is set? this should pick up in the same browser different tab