JavaScript QR Code Reader - can it be done? Or, Remote Service?

Question

I\'m doing a bit of preliminary research on an upcoming project and I have a quick question that I figure I\'ll throw up here while I look elsewhere, in case anyone has any

Answer 1

Because of memory limits for JavaScript on mobile devices, it's likely to take too long for practical use, if it is possible with purely JS.

I don't know exactly how the Appcelerator API works with external native libraries, but your best bet is to pass the image data to the native code (Objective-C or Java) and then use a lower-level library (like iphone-qrcode) to parse the QR code, then pass the result back to the JS execution context.

This has the added advantage of working offline, which a remote service could not do.