jQuery upload file using jQuery's ajax method (without plugins)

Question

At moment I want to implement picture upload without using any plug-ins.

My upload form looks like this

Answer 1

Whilst you could create a multipart/form-data request body yourself to include a file upload field, it's not going to help you because you cannot read client-side files from the file upload field.

(Except using the FileList interface, but currently only Firefox supports that.)