How can I determine which version of IE a user is running in JavaScript?

Question

In some existing code there is a test to see if the user is running IE, by checking if the object Browser.Engine.trident is defined and returns true.

But how can I deter

Answer 1

This should give you more details than you'll want:

var agent = navigator.userAgent;
var msiePattern = /.*MSIE ((\d+).\d+).*/
if( msiePattern.test( agent ) ) {
  var majorVersion = agent.replace(msiePattern,"$2");
  var fullVersion = agent.replace(msiePattern,"$1");
  var majorVersionInt = parseInt( majorVersion );
  var fullVersionFloat = parseFloat( fullVersion );
}