Javascript: Event listeners for windows media player in IE11

Question

I have come across an issue in the code base I working with in IE11 specifically.

Other versions of IE allow me to listen to a specific event called 'OpenStateChanged' which is fired from Windows Media Player like so.

document.getElementById('video-player').attachEvent("OpenStateChanged",
                    (newState) =>
                )

When running the code in IE11, I am getting the error Object doesn't support property or method 'attachEvent' which I understand as it is no longer supported. So I have modified my code to check if you can use the newer addEventListener.

if (document.getElementById('video-player').addEventListener) 
                document.getElementById('video-player').addEventListener("OpenStateChanged",
                    (newState) =>
                        console.log newState
                        #MediaOpen state
                        if newState == 13
                            //do stuff
                )
else
    document.getElementById('video-player').attachEvent("OpenStateChanged",
        (newState) =>
            #MediaOpen state
            if newState == 13
                //do stuff
         )

This is alright, and it runs without throwing errors, however, the event handler function is never fired. I have noticed that things like onclick get changed to click, but I have seen no documentation on event names for Windows Media Player.

Syntax in coffeescript, can provide js alternative if required.