HTML5 save canvas to file on server

i need to create a component using html5 canvas that given an image t开发者_如何学Che user can paint on it and directly (via a kind of save button) upload it's customized version on the server.

Can i use html canvas for it ? Any suggestion ?

thx in advance

You can get the image as data-url like this:

var dataUrl = document.getElementById('your-canvas').toDataURL();

You could then send this (very long string) to the server and save it to a file after decoding it (it is encoded in base64).

EDIT: Remember to submit this via POST, as suggested in the comments. GET has some length-limits in various browsers, so its likely to exceed those limits with such a huge amout of data.

Note that this is currently dead-on-arrival for Android (up to and including 2.3). Please star this issue - http://code.google.com/p/android/issues/detail?id=7901