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iphone - How to redirect from Mobile Safari to Native iOS app (like Quora)?

On my iPhone, I just noticed that if I do a Google Search (in Mobile Safari) and select a result on quora.com, the result page launches the native Quora app on my phone.

How is this done? Specifically, is it a detection of the user agent and the use of an iOS URL scheme? Can it tell if the native app is installed and/or redirect to the app store?

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I'm reposting an answer to my own related (but was originally Ruby-on-Rails-specific) question from here: Rails: redirect_to 'myapp://' to call iOS app from mobile safari

You can redirect using javascript window.location.

Sample code:

<html><head>
    <script type="text/javascript">
      var userAgent = window.navigator.userAgent;
      if (userAgent.match(/iPad/i) || userAgent.match(/iPhone/i)) {
        window.location = "myiosapp://"
      }
    </script>
  </head>
  <body>
    Some html page
  </body>
</html>

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