javascript - How do I get a canvas to attach to paperclip so I can save it into my database? -

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i have little demo of of camera app:

https://shielded-plains-5586.herokuapp.com/

when press "drop', creates canvas after take picture webcam below it. problem don't know how canvas image , have save database through form paperclip on it. i'm stumped. help?

use canvas.todataurl(), return image data uri.

post server need write file , save path in database.

https://developer.mozilla.org/en-us/docs/web/api/canvasrenderingcontext2d/getimagedata


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