JavaScript IP-based redirection, best approach?

[AxialDev]

Hi everyone,

What are the best practices for implementing Javascript redirections like on http://www.nike.com/ to send visitors to the right country section? I see it uses cookies and sessions to store the country and language, but what about search engines? Are they redirected via JS? Are there any risks that Google can't crawl everything?

We had IP-based, server-side redirections on a few country-specific websites (purehazelwood.com, purnoisetier.fr, purnoisetier.com) that we had to remove because googlebot was always redirected to the US site and couldn't access the other sites. We instead added pop-ups if the visitor is accessing the "wrong" site but we'd like the redirection to be automatic.

Is the javascript approach the best? Anything else we need to think about?

Thanks for your time!