Elemental2 1.0.0-beta-1 and casting behaves unexpectedly

[Daniel Harezlak]

Hi, I have the following code using elemental2-dom:

HTMLIFrameElement frame = (HTMLIFrameElement) DomGlobal.document.createElement("iframe");
HTMLDocument doc = (HTMLDocument) frame.contentDocument; //throws java.lang.ClassCastException

The second line throws an exception although I am quite sure that the returned element is an HTMLDocument because when I log it in the JS console I get "[object HTMLDocument]". The first line works fine. What is strange the exception is only thrown in Chrome both in SDM and production modes. In Firefox it works just fine. Any thoughts?

[Daniel Harezlak]

The way to work around it is to use a native method:

private static native HTMLDocument getHtmlDocument(HTMLIFrameElement frame) /*-{
    return frame.contentDocument;
}-*/;

Is this required?

[gwtt...@gmail.com]

How about using jsinterop.base.Js.cast() for the casing instead? - see: https://groups.google.com/forum/#!topic/Google-Web-Toolkit/0XGv7EhDFmc

[Kirill Prazdnikov]

Hi, I have the same issue and use the same JSNI hack
It is interesting why
GWT does runtime type checks for @JsType(isNative = true) ?
Why is it reasonable ?

[Daniel Harezlak]

Js.cast() also throws but Js.uncheckedCast() does not. Can anyone elaborate?

[Daniel Harezlak]

OK, this this particular use case was explained here: https://groups.google.com/forum/#!topic/google-web-toolkit-contributors/8lESs0WMHDM. Thank you Arnaud.