TextTrackList onchange not working in Microsoft Edge

[wannabefro]

The onchange event is not being triggered on a TextTrackList in Microsoft Edge.
I've produced a simple example bin here
Expected behaviour is when switching between textTracks, "changed track" should be logged to the console.

The output of what player.textTracks() is below

[object TextTrackList] {
  0: [object TextTrack] {
    activeCues: null,
    addCue: function addCue() { [native code] },
    addEventListener: function addEventListener() { [native code] },
    cues: [object TextTrackCueList] { ... },
    DISABLED: 0,
    dispatchEvent: function dispatchEvent() { [native code] },
    ERROR: 3,
    HIDDEN: 1,
    inBandMetadataTrackDispatchType: "",
    kind: "subtitles",
    label: "English",
    language: "en",
    LOADED: 2,
    LOADING: 1,
    mode: "disabled",
    NONE: 0,
    oncuechange: null,
    onerror: null,
    onload: null,
    readyState: 0,
    removeCue: function removeCue() { [native code] },
    removeEventListener: function removeEventListener() { [native code] },
    SHOWING: 2
  },
  addEventListener: function addEventListener() { [native code] },
  dispatchEvent: function dispatchEvent() { [native code] },
  item: function item() { [native code] },
  length: 1,
  onaddtrack: null,
  removeEventListener: function removeEventListener() { [native code] }
}

I noticed that both onchange and onremovetrack are missing from it.

[heff]

I don't have access to a VM with Edge yet. Would you be able to try the 5.0 branch and see if that works any better?
http://jsbin.com/sofiwu/edit?html,console,output

[wannabefro]

I tried it using rc39 here and can't get subtitles to appear in the first place in edge. player.textTracks().length is 0.

Removing videojs in it's entirety (so just the video element) shows the subtitles correctly.

[mmcc]

Insert snarky Microsoft browser comment

That's helpful, I'll grab a copy of Edge on one my IE VMs and see if I figure out anything else useful.

[wannabefro]

thanks! 😃

If there's anything I can help with in the meantime just let me know. We've got a windows 10 machine set up in the office so it's pretty straight forward for me to test things in edge.

[mmcc]

Excellent, we'll definitely take you up on that.

[gkatsev]

I wonder if Edge has issues with unclosed track or source elements.
Also, can you please report what you get for videojs.getComponent('Html5').supportsNativeTextTracks() in Edge? We should narrow down whether this is an issue with native tracks or not.

[wannabefro]

videojs.getComponent('Html5').supportsNativeTextTracks() returns true in edge

[hartman]

PS poking the MS Edge dev team on twitter really works at times and of course upstream issues when confirmed should really be reported at https://connect.microsoft.com/ie/feedback

[gkatsev]

Yep, looks like while it supports tracks, it doesn't support events on these tracks.
I filed a bug against IE11 (https://connect.microsoft.com/IE/feedbackdetail/view/1660701/text-tracks-do-not-fire-change-addtrack-or-removetrack-events) and tweeted at MSEdge to ask if there's someplace better to file a bug for it (https://twitter.com/gkatsev/status/631571823155638272)

[gkatsev]

To fix #2465 we turned off native tracks on IE11 (and there by Edge) in #2466. And this there's a bug filed against IE/Edge, I'll close this. I'll update it if as necessary when there are updates on the bug.