A WindowBase subclass does not implement addEventListener

[DartBot]

This issue was originally filed by [email protected]

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https://api.dartlang.org/apidocs/channels/stable/#dart-dom-html.WindowBase reads:

void addEventListener(String type, EventListener listener, [bool useCapture])
Register an event handler of a specific event type on the EventTarget.

but the following code fails:

  IFrameElement ife=new IFrameElement();
  document.body.append(ife);
  WindowBase nw=ife.contentWindow;
  nw.addEventListener("message", (Event event) {
    print("ev=$event");
  });
  

Exception: Class '_DOMWindowCrossFrame' has no instance method 'addEventListener'.

[lrhn]

Added Area-HTML, Triaged labels.

[efortuna]

What build are you using? I'm pretty sure this very bug was fixed last week.

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Set owner to @efortuna.
Added NeedsInfo label.

[DartBot]

This comment was originally written by [email protected]

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http://storage.googleapis.com/dart-archive/channels/stable/release/latest/editor/darteditor-linux-ia32.zip still contains version 1.1.3 (Thu Feb 6 00:04:09 2014)

[efortuna]

Any build after Feb 12 has this problem fixed.

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Added AssumedStale label.

[DartBot]

This comment was originally written by [email protected]

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Chromium 33.0.1750.48, updated by tools/test.py, still throws the exception

[efortuna]

So the issue in this specific case is you can't register an event listener on a window other than yourself. It is the good ol' same origin policy issues, but Dart is slightly stricter than JavaScript. So the way to accomplish that chunk of code would be to ask the contentWindow to add its own event listener, and post a message to the parent window when it has completed so you know when you're ready to start receiving messages.

In the meanwhile, I'll update the error thrown, so that is less confusing.

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Added AsDesigned label.