I have a web application. I my JavaScript, I am identifying devices by user agent string as follows:
_android = navigator.userAgent.toLowerCase().indexOf(\"a
You can't identify if it is a tablet or not, but you can identify if it has touch or not. This is the IE user agent here:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; Touch)
The touch at the end is only present if touch is.
However, if you are just trying to identify touch capabilities, you should use feature detection rather than user agent sniffing.
User-agent string (Windows) : http://msdn.microsoft.com/en-us/library/ie/hh920767(v=vs.85).aspx