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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