Html5 finally solves an age old problem of being able to upload files while also showing the upload progress. Essentially, what you need to do is hook into the server’s byte stream while it is receiving a file so you know how many bytes you’ve received and somehow convey that information back to the client browser, while it is still in the process of uploading the file.

Matlus has written a really throughout tutorial on how to make a HTML5 File Upload with Progress, which is uploading of files using XMLHttpRequest and providing upload progress information to the end-user. This solution does not require any change to the server side, at least insofar as handling the multipart/form-data protocol. So existing server side logic should remain unchanged, which makes adapting this technology that much easier.

Requirements: HTML5 Supported Browsers
Demo: http://exposureroom.biz/upload.aspx
License: MIT License