Well if you already know the concept of JSNI then you can use it to add a
listener to GWT's XMLHttpRequest as its an ordinary JavaScriptObject. You
either extend it or create a utility method. Something along these lines
(probably not fully correct):
public native void setProgressListener(MyProgressListener p) /*-{
this.upload.addEventListener("progress", function(event) {
p.@com.example.progress.MyProgressListener::onProgress(II)(event.loaded,
event.total);
}, false);
}-*/;
A utility method would have an additional XMLHttpRequest parameter and use
request.upload instead of this.upload.
Don't forget to cleanup the event listener after you are done. Also note
that XMLHttpRequest.create() can return an IE specific object which might
not support the progress feature or which requires you do register the
listener differently. So your implementation might be a bit more
complicated depending on your browser support requirements.
-- J.
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