Native App Launcher (Works in ios9)

native_app_launcher.js

// NativeAppLauncher. 
// Copied from bartt.me/openapp
var NativeAppLauncher = (function () {
    var IOS_VERSION_RE = /OS\s+(\d)_/;
    var timers = [];
    var userAgent = window.navigator.userAgent;
    var isAndroid = function () {
      return /Android/.test(userAgent);
    };
    var isIOS = function () {
      return /(?:i(?:Phone|P(?:o|a)d))/.test(userAgent);
    };
    var iOSVersion = function () {
      return isIOS() ? parseInt(userAgent.match(IOS_VERSION_RE)[1], 10) : 0;
    };

    var isChrome = function() {
      // Opera (OPR) also identifies itself as Chrome and has to be corrected for.
      // OPR is used on Android but on iOS it is OPiOS where Opera does NOT identify as Chrome. Go figure!
      // Probably because on iOS it is Opera Mini and has all browser have to be based on Safari/WebKit.
      return /Chrome/.test(userAgent) && !/OPR/.test(userAgent);
    };
    var isFirefox = function () {
      return /Firefox/.test(userAgent);
    };

    return {
      // Stop any running timers.
      clearTimers: function () {
        console.log("Clearing timers: [" + timers.join(', ') + ']');
        timers.map(clearTimeout);
        timers = [];
      },
      // Fetch the deep link into the Twitter app.
      getDeepLink: function () {
        return isAndroid() && isFirefox() ?
          "intent://twitter.com/_/status/584046346862100481#Intent;package=com.twitter.android;scheme=https;end;" :
          "twitter://tweet?id=584046346862100481";
      },

      openApp: function (deeplink, storeURI) {
        var launcher = this;
        var storeLaunched = false;
        var gotStoreURI = "string" == typeof storeURI;
        // If this handler is part of the UI thread, i.e. the `direct` result of a user action then
        // redirecting to the App Store will happen immediately. When not part of the UI thread however,
        // the redirect will bring up an Open in App dialog. Unless there is already a dialog showing,
        // in which case the redirect dialog will wait for the currently shown dialog to be dismissed.

        gotStoreURI && timers.push(window.setTimeout(function () {
          console.log('Launching App Store: ' + storeURI);
          storeLaunched = true;
          window.top.location = storeURI;
        }, 1000));
        isIOS() && timers.push(window.setTimeout(function () {
          console.log('Reloading page');
          storeLaunched && window.location.reload()
        }, 2000));
        console.log('Launching app: ' + deeplink);
        window.location = deeplink;
      },
      // Get the deep link URI to the Twitter app in the store appropriate for the OS.
      // Using a deep link guarantees that the app store opens even when using an alternate browser (e.g. Puffin or Firefox)
      getStoreURI: function () {
        return isAndroid() ?
          "market://details?id=com.twitter.android" :
          "https://itunes.apple.com/app/twitter/id333903271?mt=8";
      },
      // Try to launch the native app on iOS/Android. Redirect to the app store if launch fails.
      init: function () {
        var launcher = this;
        var events = ["pagehide", "blur"];
        if (isIOS() || (isAndroid() && !isChrome())) {
          events.push("beforeunload");
        }
        console.log("Listening window events: " + events.join(", "));

        $(window).on(events.join(" "), function (e) {
          console.log("Window event: " + e.type);
          launcher.clearTimers();
        });

        /*
        document.getElementById('openInApp').onclick = function() {
          // Detach the app launcher from the UI thread so that the Open in App dialog won't be
          // interrupted when the delayed redirect to the App Store fires.
          setTimeout(function() {
            launcher.openApp.call(launcher, launcher.getDeepLink(), launcher.getStoreURI());
          }.bind(this), 0)
        }; */

        $('body').on('click', '#app-deep-link', function(e) {
          // Detach the app launcher from the UI thread so that the Open in App dialog won't be
          // interrupted when the delayed redirect to the App Store fires.
          e.preventDefault();
          setTimeout(function() {
            launcher.openApp.call(launcher, launcher.getDeepLink(), launcher.getStoreURI());
          }.bind(this), 0)

        })
      }
    };
})();