elemental2: Document.createEvent ?

[Vassilis Virvilis]

Hi,

I am looking for Document.createEvent and I can see that createEvent
is defined in DocumentEvent which is an interface but Document itself
does not inherit/implement this interface.

I suppose I can cast Document it to DocumentEvent with Js.cast() but
that's ugly.

So what's going on?

I am using elemental2 2.25 as published by Peter Donald.

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Vassilis Virvilis

[Vassilis Virvilis]

What about Document.execCommand() ?

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Vassilis Virvilis

[Peter Donald]

execCommand is not yet part of elemental2. There is no reason why it should not be other than the externs need cleaning up. It is on my list of things to do some time but we don't use it so I haven't got off my kaboose to do the work. The issue that is tracking this (among other things) is https://github.com/google/elemental2/issues/86

Until that is completed you will have to use jsinterop to do it yourself.

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Cheers,

Peter Donald

[Vassilis Virvilis]

Hi Peter,

Thanks for replying and for pointing me to the github issue.

I am thinking the following strategy.

Create a MyHTMLDocument that extends HTMLDocument and it has the
execCommand but without the @Override annotations.

That way when HTMLDocument gets execDocument implemented I will get a
warning and at that point I will be able to remove the MyHTMLDocument
class and use the official one. Aargh now I see that is already
mentioned in the comments of the original execCommand issue at
https://github.com/google/elemental2/issues/43 by vegegoku.

Thanks again.

Vassilis

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Vassilis Virvilis

[Vassilis Virvilis]

Hi again,

I did create a class MyHTMLDocument that extends HTMLDocument.

However

final MyHTMLDocument doc = Js.cast(DomGlobal.document); <-- this crashes
final MyHTMLDocument doc = Js.uncheckedCast(DomGlobal.document); <-- this works

any idea why uncheckedCast is required?

Thanks

Vassilis Virvilis

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Vassilis Virvilis

[Jens]

final MyHTMLDocument doc = Js.cast(DomGlobal.document);  <-- this crashes
final MyHTMLDocument doc = Js.uncheckedCast(DomGlobal.document);  <-- this works

Because the native browser document isn't a MyHTMLDocument? You can only treat it like a MyHTMLDocument by doing a nasty unchecked cast so you can call that method you need.

-- J.

[Vassilis Virvilis]

It would be great if there was some documentation that could compare
and spell the differences between
standard cast (), Js.cast(), Js.uncheckedCast() in various use cases
so we could have a list of dos and donts.

Vassilis

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Vassilis Virvilis

[Jens]

It would be great if there was some documentation that could compare
and spell the differences between
standard cast (), Js.cast(), Js.uncheckedCast() in various use cases
so we could have a list of dos and donts.

There is a whole section about instanceof/cast in https://docs.google.com/document/d/10fmlEYIHcyead_4R1S5wKGs1t2I7Fnp_PaNaa7XTEk0/edit#heading=h.kog1ji9nzq7y

-- J.

[Vassilis Virvilis]

Jens,

Thanks for reminding me. I have totally forgot this section.

I believe that the document was written before Js.cast and Js.unchecked cast.

Maybe some use cases and some examples would be helpful.

Thanks again.

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Vassilis Virvilis