How do I detect, via javascript in Safari Mobile, if my iPhone application is installed?

Question

As you probably know, iPhone applications can register a custom URL scheme handler, ala \"myapp:\" and these can be used for links in a page viewed in Safari.

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Answer 1

The solution I've presented on another Stack Overflow question is about as close as you're going to get.

Answer 2

I don't think this is possible. You would need to register your app on the iPhone/Mobile Safari and then create a uri to fire your app up, just like http:, ftp: mailto:. So in your case you would have something like Am I installed Mobile Safari would need to know what app to fire up to load that URI and I just don't think this functionality is built into the iPhone. I know there is no way javascript can query your iPhone to see what's installed.

I hope I am wrong as this seems like it would be a powerful feature, though on the other side I can see some security issues related to something like this.

Good luck.