Have you checked Elemental? AFAICT, everything's there already.
http://www.gwtproject.org/articles/elemental.html
On Wednesday, November 27, 2013 4:02:48 PM UTC+1, confile wrote:
>
> want to observe the upload percentage of a file upload from GWT.
>
> In JavaScript you can use a XMLHttpRequest and add an event listener like
> this:
>
> var oReq = new XMLHttpRequest();
>
> oReq.upload.addEventListener("progress", updateProgress, false);
> // progress on transfers from the server to the client (downloads)
> function updateProgress (oEvent) {
> if (oEvent.lengthComputable) {
> var percentComplete = oEvent.loaded / oEvent.total;
> // ...
> } else {
> // Unable to compute progress information since the total size is unknown
> }}
>
> (The above code is from
> here<https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest>
> .)
>
> This is also done very easily in jQuery as:
>
> var $request = $.ajax({
> xhr: function() {
> xhrNativeObject = new window.XMLHttpRequest();
> //Upload progress
> xhrNativeObject.upload.addEventListener("progress", function(event) {
> ... }
> }
> });
>
> I want to do the same with GWT. I could use a
> RequestBuilder<http://www.gwtproject.org/javadoc/latest/com/google/gwt/http/client/RequestBuilder.html>
> to
> send a request, but this is only a high level wrapper around the
> XMLHttpRequest JavaScriot object. Another possibility would be to use the
> GWT
> XMLHttpRequest<http://www.gwtproject.org/javadoc/latest/com/google/gwt/xhr/client/XMLHttpRequest.html>
> class
> which is a JSNI wrapper of the JavaScript XMLHttpRequest.
>
> My problem:
>
> *How can I add a progress listener to the XMLHttpRequest or the
> RequestBuilder?*
>
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