Determine if user navigated from mobile Safari

Question

I have an app, and I'd like to redirect the users to different pages based on where they are navigating from.

If navigating from web clip, do not redirect. If navigating from mobile Safari, redirect to safari.aspx. If navigating from anywhere else, redirect to unavailable.aspx

I was able to use http://stackoverflow.com/questions/2738766/iphone-webapps-is-there-a-way-to-detect-how-it-was-loaded-home-screen-vs-safari to determine if the user was navigating from a web clip, but I'm having trouble determining if the user navigated from mobile Safari on an iPhone or iPod.

Here's what I have:

if (window.navigator.standalone) {
    // user navigated from web clip, don't redirect
}
else if (/*logic for mobile Safari*/) {
    //user navigated from mobile Safari, redirect to safari page
    window.location = "safari.aspx";
}
else {
    //user navigated from some other browser, redirect to unavailable page
    window.location = "unavailable.aspx";
}

Answer 1

You should be able to check for the "iPad" or "iPhone" substring in the user agent string:

var userAgent = window.navigator.userAgent;

if (userAgent.match(/iPad/i) || userAgent.match(/iPhone/i)) {
   // iPad or iPhone
}
else {
   // Anything else
}