I have an HTML form that contains a file input field with multiple file selection and I also have a drag and drop feature that I am working on as well. My question is how to int
You could use "HTML5-File-Uploader" which purports to do what you need as well as gracefully degrade for older browsers:
https://github.com/gre/HTML5-File-Uploader/wiki
I haven't tried it myself.
Alternatively, you could take a look at this page, which supplies all the code you need to do it yourself:
http://robertnyman.com/2010/12/16/utilizing-the-html5-file-api-to-choose-upload-preview-and-see-progress-for-multiple-files/