IE9: deleting data in input doesn't go to the state #29

IE 9 does not fire an input event when the user deletes characters from an input (e.g. by pressing Backspace or Delete, or using the "Cut" operation)

https://developer.mozilla.org/en-US/docs/Web/Events/input#Browser_compatibility

So the onChange event isn't triggered by deleting characters -> another event should be used in case of IE9.