rollbar/src/browser/detection.js

Effortlessly track and debug errors in your JavaScript applications with Rollbar. This package includes advanced error tracking features and an intuitive interface to help you identify and fix issues more quickly.

// This detection.js module is used to encapsulate any ugly browser/feature
// detection we may need to do.

// Figure out which version of IE we're using, if any.
// This is gleaned from http://stackoverflow.com/questions/5574842/best-way-to-check-for-ie-less-than-9-in-javascript-without-library
// Will return an integer on IE (i.e. 8)
// Will return undefined otherwise
function getIEVersion() {
  var undef;
  if (typeof document === 'undefined') {
    return undef;
  }

  var v = 3,
    div = document.createElement('div'),
    all = div.getElementsByTagName('i');

  while (
    ((div.innerHTML = '<!--[if gt IE ' + ++v + ']><i></i><![endif]-->'), all[0])
  );

  return v > 4 ? v : undef;
}

var Detection = {
  ieVersion: getIEVersion,
};

module.exports = Detection;