Xmlhttprequest Upload Progress Not Firing Correctly

I'm trying to send a file using XMLHttpRequest, which is working, but my progress monitor is not working. I've tried uploading a 700KB file and a 3MB file and I get the same issue.

Solution 1:

Alright, I had this issue too and was really suprised why it did not work after spending many hours on this with many examples from the net. Funny or depressing thing was, that it did work perfectly on other machines with almost the same setup.

I found out that my antivirus program was causing this issue. For example if you use AVG, there is a feature called LinkScanner. If this is enabled it will not call the XMLHttpRequest.upload.progress event properly. I am sure there are other web based features in other antivirus programs that can influence this functionality.

Hope this might help others who face the same issue and spent hours of pain...