Hello,
i am trying to make qrcode with html5. I am using the following javascript. But what I want is to open the rear camera directly when the start is pressed.
How is this possible?
https://github.com/mebjas/html5-qrcode
 HTML
<!DOCTYPE html>
<html>
<head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/html5-qrcode/2.0.3/html5-qrcode.min.js"></script>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <div id="qr-reader" style="width:1000px"></div>
    <div id="qr-reader-results"></div>
    <script>
        var resultContainer = document.getElementById('qr-reader-results');
        var lastResult, countResults = 0;
        function onScanSuccess(decodedText, decodedResult) {
            if (decodedText !== lastResult) {
                ++countResults;
                lastResult = decodedText;
                // Handle on success condition with the decoded message.
                console.log(`Scan result ${decodedText}`, decodedResult);
                alert(decodedText, decodedResult); 
            }
        }
             var html5QrcodeScanner = new Html5QrcodeScanner
            (
                "qr-reader", { fps: 10, qrbox: 750 }
            );
            html5QrcodeScanner.render(onScanSuccess);
    </script>
</body>
</html>