Minimal JavaScript function to detect version of Internet Explorer or Edge

If possible your code should detect features, not browsers. But sometimes you just need to sniff the browser. And when you do, you're probably fighting a Microsoft product.

The following function returns a Number like 10, 11, 12, 13 for Internet Explorer or Edge (anything above 11 is Edge). It returns undefined for any other browser.

function ieVersion(uaString) {
  uaString = uaString || navigator.userAgent;
  var match = /\b(MSIE |Trident.*?rv:|Edge\/)(\d+)/.exec(uaString);
  if (match) return parseInt(match[2])
}

Here are the tests:

describe('ieVersion()', () => {

  it('returns 10 for Internet Explorer 10', () => {
    version = up.browser.ieVersion('Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)')
    expect(version).toEqual(10)
  })

  it('returns 11 for Internet Explorer 11', () => {
    version = up.browser.ieVersion('Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko')
    expect(version).toEqual(11)
  })

  it('returns 12 for Edge 12', () => {
    version = up.browser.ieVersion('Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Edge/12.0')
    expect(version).toEqual(12)
  })

  it('returns 13 for Edge 13', () => {
    version = up.browser.ieVersion('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586')
    expect(version).toEqual(13)
  })
)
Henning Koch over 2 years ago
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