A sample integration to use related barcode applications in order to read QR data

barcodeReader.js

        function tryAppStore() {
            setTimeout(function() {
                window.location = "https://appsto.re/tr/6XPCz.i";
            }, 25);
            window.location="Barcode://scan/";
        }
        
        function tryGoogleStore() {
            setTimeout(function() {
                window.location = "https://play.google.com/store/apps/details?id=com.google.zxing.client.android&hl=en";
            }, 25);
            window.location="zxing://scan/?ret=http%3A%2F%2Ffoo.com%2Fproducts%2F%7BCODE%7D%2Fdescription&SCAN_FORMATS=UPC_A,EAN_13";
        }
        
        function GetURLParameter(sParam) {
            var sPageURL = window.location.search.substring(1);
            var sURLVariables = sPageURL.split('&');
            for (var i = 0; i < sURLVariables.length; i++) {
                var sParameterName = sURLVariables[i].split('=');
                if (sParameterName[0] == sParam)
                    return sParameterName[1];
            }
        }

        if (window.navigator.userAgent.indexOf('iPhone') != -1)
            tryAppStore();
        else if (window.navigator.userAgent.indexOf('Android') != -1)
            tryGoogleStore();
        else
                alert("Please use an iOS or Android OS!..");
        
        var barcode = GetURLParameter('barcode');