QR scanning

Dear Lazyweb,

Is it possible for JavaScript on iOS to scan a QR code using the camera, and return the scanned data to the caller?

As always, please only respond with things that you have seen working with your own eyeballs. I see a few things that maybe purport to do this, but they don't work.

We check people off of our guest lists using a JavaScript-heavy web page on various tablets, and it might be a little faster if, instead of needing to scroll to the customer's name, we could just point the tablet's camera at a QR code that the customer is waving at us.

Update: This one seems to work well so far.

Previously, previously, previously.

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