How to check if an app is installed from a web
I want to create a web-page, a page that will redirect an iPhone to the app-store if the iPhone does not have the application installed, but if the iPhone has the app installed I want it to open the application.
I have already implemented a custom url in the iPhone application so I have an url for the application that is something like:
myapp://
And if this url is invalid, I want the page to redirect to the app store. Is this possible at all?
If I don't have the application installed on the phone and write the myapp:// url in safari, all I get is an error message.
Even if there exists an ugly hack with javascript I would really like to know?
As far as I know you can not, from a browser, check if an app is installed or not.
But you can try redirecting the phone to the app, and if nothing happens redirect the phone to a specified page, like this:
setTimeout(function () { window.location = "https://itunes.apple.com/appdir"; }, 25);
window.location = "appname://";
If the second line of code gives a result then the first row is never executed.
Hope this helps!
Similar question:
To further the accepted answer, you sometimes need to add extra code to handle people returning the browser after launching the app- that setTimeout function will run whenever they do. So, I do something like this:
var now = new Date().valueOf();
setTimeout(function () {
if (new Date().valueOf() - now > 100) return;
window.location = "https://itunes.apple.com/appdir";
}, 25);
window.location = "appname://";
That way, if there has been a freeze in code execution (ie, app switching), it won't run.
iOS Safari has a feature that allows you to add a "smart" banner to your webpage that will link either to your app, if it is installed, or to the App Store.
You do this by adding a meta tag to the page. You can even specify a detailed app URL if you want the app to do something special when it loads.
Details are at Apple's Promoting Apps with Smart App Banners page.
The mechanism has the advantages of being easy and presenting a standardized banner. The downside is that you don't have much control over the look or location. Also, all bets are off if the page is viewed in a browser other than Safari.
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