MessageEvent throws an exception when trying to access data field and it's an object

[DartBot]

This issue was originally filed by dpetroff...@gmail.com

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I send a message via postMessage to the window from javascript code and to receive it from the dart code. If I send a string message, dart code can access data field from MessageEvent without any problems. But If I send an object with postMessage, any access to data field causes exception.

JS code:
window.addEventListener('message', function(ev) {
    if (ev.data == 'init') {
        console.log(arguments);
        window.postMessage({some: 'message from js'}, '*');
    };
});

Dart code:
    window.on.message.add((ev) {
      if (ev.data != 'init') {
        window.console.log(ev.data);
        window.console.log(ev.data.some);
      }
    });
    window.postMessage('init', '*');

Console output:
MessageEvent
Uncaught TypeError: Object #<Object> has no method 'ptr$htmlimpl0a8e4b$$getter'

[sigmundch]

cc @vsmenon.
Added Area-UI, Triaged labels.

[vsmenon]

Removed Area-UI label.
Added Area-DOM label.

[vsmenon]

Need to determine the right semantics for this.

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Set owner to @vsmenon.
Added this to the M1 milestone.

[iposva-google]

Removed Area-DOM label.
Added Area-HTML label.

[vsmenon]

Removed the owner.

[vsmenon]

anton: do you know if dartium supports more than strings here?

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Removed this from the M1 milestone.
Added this to the M2 milestone.

[DartBot]

This comment was originally written by antonm@google.com

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Apparently Dartium can cope with serialized values and we support a fair share if not all of those. Not tested though.

[DartBot]

This comment was originally written by shyc201...@gmail.com

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For now I think we can JSON.stringify the object before sending and JSON.parse it after receiving it.

But I'm still waiting for full support in Dart. It shouldn't be too hard if Dartium has implemented the HTML5 structured clone algorithm. Or is it?

[blois]

Removed this from the M2 milestone.
Added this to the Later milestone.

[blois]

Issue #3363 has been merged into this issue.

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cc @rakudrama.

[blois]

Issue #1444 has been merged into this issue.

[blois]

Removed this from the Later milestone.
Added this to the M2 milestone.

[blois]

With bug #­5369 fixed, this should now be working.

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Added Duplicate label.
Marked as being merged into #5369.

[DartBot]

This comment was originally written by shy...@gmail.com

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I don't think #­5369 is related to this bug. And I can confirm e.data is still not working with objects in Dartium Version 24.0.1290.0 (160763).