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How can javascript know file upload progress? Is there some kind of standard communication method between the browser and the server that tracks progress and sends progress status back to the browser, or can it be done entirely from within javascript?
If it makes a difference I am using a JVM backend.
Thanks!
There are lots of solutions for this. Generally, javascript on its own has no notion of bytes being transferred, so you need to use AJAX to get back the percentage of bytes transferred. Here’s a tutorial for JSP. Other solutions use flash.