Ajax File Upload, 'progress' Upload Event Does Not Fire In Edge Browser

I'm developing a file upload control that posts form data via ajax. I have this working cross browser in Chrome, Firefox, IE 11, 10. However in the Microsoft Edge browser, the uplo

Solution 1:

This is a known issue of Edge 15, as you can check here. Anyone can reproduce the error with this fiddle.

xhr.upload.onprogress = updateProgress;
// I only added this code because stack overflow forced me!

As you can see, it only updates when reaching a hundred percent.

Update The Windows October seems to fix this bug on Edge (Windows Version 1809)