At the beginning it was not clear for me that this is a mgwt - topic. But
you are right.
Adding a DomHandler which is listening on Error Events does not work. The
Window.alert-Message will be never reached.
cellList.addDomHandler(new ErrorHandler() {
@Override
public void onError(ErrorEvent event) {
Window.alert("error occurred!");
}
}, ErrorEvent.getType());
Inspired by http://www.stillnetstudios.com/onerror-img-image-tag/ I found
an other way. If I add in my uibinder.ui.xml:
<img class="{style.image}" src="{itemImage}" alt="" onerror="this.src=
'http://alternative/image.jpg'" />
It works but it seems not very elegant. E.g.: loop if onerror-image not
available/reachable. It would be nice to handle the onerror in gwt-code and
not in the declaration of the template. The next thing I need to test with
this solution is to display an Image-Resource from ClientBundle.
Am Mittwoch, 7. Januar 2015 18:27:32 UTC+1 schrieb Jens:
>
> A bit unfortunate that GWT has a CellList and MGWT has a CellList and both
> are totally different. Maybe you should ask this on a MGWT mailing list?
>
> But given that MGWT CellList is a Widget you can add any event handler to
> it using addDomHandler(). I am not sure about the error event but I would
> try adding a ErrorEvent/ErrorHandler to the CellList. If it really triggers
> then you should be able to figure out the <img> element and change its src
> attribute if loading has failed.
>
> And yes you need an <img> element because no event exists that tells you
> if a CSS background image has been loaded or not.
>
> -- J.
>
>
>
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