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How to check if an app is installed from a web-page on an iPhone?

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忘了有多久
忘了有多久 2020-11-22 09:57

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 instal

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  • 温柔的废话
    2020-11-22 10:05

    Didn't read all of these but may be use an iframe and adding the source to, "my app://whatever".

    Then check regularly on set interval of the page is 404or not.

    You could also use Ajax call. If 404 response then app is not installed.

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  • 离开以前
    2020-11-22 10:07

    As of 2017, it seems there's no reliable way to detect an app is installed, and the redirection trick won't work everywhere.

    For those like me who needs to deep link directly from emails (quite common), it is worth noting the following:

    • Sending emails with appScheme:// won't work fine because the links will be filtered in Gmail

    • Redirecting automatically to appScheme:// is blocked by Chrome: I suspect Chrome requires the redirection to be synchronous to an user interaction (like a click)

    • You can now deep link without appScheme:// and it's better but it requires a modern platform and additional setup. Android iOS

    It is worth noting that other people already thought about this in depth. If you look at how Slack implements his "magic link" feature, you can notice that:

    • It sends an email with a regular http link (ok with Gmail)
    • The web page have a big button that links to appScheme:// (ok with Chrome)
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  • 一个人的身影
    2020-11-22 10:10

    The date solution is much better than others, I had to increment the time on 50 like that this is a Tweeter example:

    //on click or your event handler..
var twMessage = "Your Message to share";
var now = new Date().valueOf();
setTimeout(function () {
   if (new Date().valueOf() - now > 100) return;
   var twitterUrl = "https://twitter.com/share?text="+twMessage;
   window.open(twitterUrl, '_blank');
}, 50);
window.location = "twitter://post?message="+twMessage;

    the only problem on Mobile IOS Safari is when you don't have the app installed on device, and so Safari show an alert that autodismiss when the new url is opened, anyway is a good solution for now!

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  • 既然无缘
    2020-11-22 10:14

    @Alistair pointed out in this answer that sometimes users will return to the browser after opening the app. A commenter to that answer indicated that the times values used had to be changed depending on iOS version. When our team had to deal with this, we found that the time values for the initial timeout and telling whether we had returned to the browser had to be tuned, and often didn't work for all users and devices.

    Rather than using an arbitrary time difference threshold to determine whether we had returned to the browser, it made sense to detect the "pagehide" and "pageshow" events.

    I developed the following web page to help diagnose what was going on. It adds HTML diagnostics as the events unfold, mainly because using techniques like console logging, alerts, or Web Inspector, jsfiddle.net etc all had their drawbacks in this work flow. Rather than using a time threshold, the Javascript counts the number of "pagehide" and "pageshow" events to see whether they have occurred. And I found that the most robust strategy was to use an initial timeout of 1000 (rather than the 25, 50, or 100 reported/suggested by others).

    This can be served on a local server, e.g. python -m SimpleHTTPServer and viewed on iOS Safari.

    To play with it, press either the "Open an installed app" or "App not installed" links. These links should cause respectively the Maps app or the App Store to open. You can then return to Safari to see the sequence and timing of the events.

    (Note: this will work for Safari only. For other browsers (like Chrome) you'd have to install handlers for the pagehide/show-equivalent events).

    Update: As @Mikko has pointed out in the comments, the pageshow/pagehide events we are using are apparently no longer supported in iOS8.

    <html>
<head>
</head>
<body>
<a href="maps://" onclick="clickHandler()">Open an installed app</a>
<br/><br/>
<a href="xmapsx://" onclick="clickHandler()">App not installed</a>
<br/>

<script>

var hideShowCount = 0 ;
window.addEventListener("pagehide", function() {
    hideShowCount++ ;
    showEventTime('pagehide') ;
});

window.addEventListener("pageshow", function() {
    hideShowCount++ ;
    showEventTime('pageshow') ;
});

function clickHandler(){
    var hideShowCountAtClick = hideShowCount ;
    showEventTime('click') ;
    setTimeout(function () {
               showEventTime('timeout function '+(hideShowCount-hideShowCountAtClick)+' hide/show events') ;
               if (hideShowCount == hideShowCountAtClick){
                    // app is not installed, go to App Store
                    window.location = 'http://itunes.apple.com/app' ;
               }
            }, 1000);
}

function currentTime()
{
    return Date.now()/1000 ;
}

function showEventTime(event){
    var time = currentTime() ;
    document.body.appendChild(document.createElement('br'));
    document.body.appendChild(document.createTextNode(time+' '+event));
}
</script>
</body>
</html>
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  • 野趣味
    2020-11-22 10:14

    After compiling a few answers, I've come up with the following code. What surprised me was that the timer does not get frozen on a PC (Chrome, FF) or Android Chrome - the trigger worked in the background, and the visibility check was the only reliable info.

    var timestamp             = new Date().getTime();
var timerDelay              = 5000;
var processingBuffer  = 2000;

var redirect = function(url) {
  //window.location = url;
  log('ts: ' + timestamp + '; redirecting to: ' + url);
}
var isPageHidden = function() {
    var browserSpecificProps = {hidden:1, mozHidden:1, msHidden:1, webkitHidden:1};
    for (var p in browserSpecificProps) {
        if(typeof document[p] !== "undefined"){
        return document[p];
      }
    }
    return false; // actually inconclusive, assuming not
}
var elapsedMoreTimeThanTimerSet = function(){
    var elapsed = new Date().getTime() - timestamp;
  log('elapsed: ' + elapsed);
  return timerDelay + processingBuffer < elapsed;
}
var redirectToFallbackIfBrowserStillActive = function() {
  var elapsedMore = elapsedMoreTimeThanTimerSet();
  log('hidden:' + isPageHidden() +'; time: '+ elapsedMore);
  if (isPageHidden() || elapsedMore) {
    log('not redirecting');
  }else{
    redirect('appStoreUrl');
  }
}
var log = function(msg){
    document.getElementById('log').innerHTML += msg + "<br>";
}

setTimeout(redirectToFallbackIfBrowserStillActive, timerDelay);
redirect('nativeApp://');

    JS Fiddle

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  • 忘掉有多难
    2020-11-22 10:16

    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:

    • iPhone browser: Checking if iPhone app is installed from browser
    • Is it possible to register a http+domain-based URL Scheme for iPhone apps, like YouTube and Maps?
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