We know it's possible to look up the IP of a visitor using JSON and a callback, as seen here Can I perform a DNS lookup (hostname to IP address) using client-side Javascript? and also at - but what about a similar thing for the user agent?
We know it's possible to look up the IP of a visitor using JSON and a callback, as seen here Can I perform a DNS lookup (hostname to IP address) using client-side Javascript? and also at http://news.ybinator./item?id=1896015 - but what about a similar thing for the user agent?
Share Improve this question edited May 23, 2017 at 12:34 CommunityBot 11 silver badge asked Jan 25, 2012 at 20:28 cwdcwd 54.9k55 gold badges171 silver badges199 bronze badges 02 Answers
Reset to default 5This string is directly available in navigator.userAgent. However, this string is not very reliable, because the user can easily modify it. Only use it for non-critical purposes.
If you want to detect the user agent, so that you "know" what's supported, you'd better switch to capability-detection.
Examples of alternative methods to detect the browser:
- IE: Conditional ments (HTML (also includes IE version) or in JScript)
- Firefox / Webkit / Opera: Setting a CSS property with a vendor-prefix, and checking for the existence of the just-set property.
navigator.userAgent contains the user agent string of the browser.