Differentiate between mouse and keyboard triggering onclick

Could check if event.screenX and event.screenY are zero.

$('a#foo').click(function(evt) {
  if (evt.screenX == 0 && evt.screenY == 0) {
    window.alert('Keyboard click.');
  } else {
    window.alert('Mouse click.');
  }
});

Demo on CodePen

I couldn’t find a guarantee that it works in all browsers and all cases, but it has the benefit of not trying to detect a “click” done via the keyboard. So this solution detects “click” more reliably at the cost of detecting if it’s from keyboard or mouse somewhat less reliably. If you prefer the reverse, look as the answer from @Gonzalo.

Note: One place I found using this method is Chromium