HOW TO PASS VARIABLES INTO DIFFERENT PAGES

[kaito]

Hi everybody !!

I have a form with (there are other fields, but the relevant ones are the following):

- button: that opens a new window and run a javascript that let you scan a QR code (this is the link I have used https://learncodeweb.com/jquery/how-to-use-instascan-an-html5-qr-scanner/ it woks ok if someone else want to use it). QR code is stored into var content

- Field element: read only

In the new window opened for the QR scanner, I store QR code into variable content. Then, I assign this var to sessionStorage.setItem("qrleido",content);

<script type="text/javascript">
    var audio = new Audio('https://media.geeksforgeeks.org/wp-content/uploads/20190531135120/beep.mp3');
    var scanner = new Instascan.Scanner({ video: document.getElementById('preview'), scanPeriod: 5, mirror: false });
    scanner.addListener('scan',function(content){
                  audio.play(); 
                  sessionStorage.setItem("qrleido", content);
                  alert(content);
                  window.close();
     });
</script>

But I don´t know how to update field element using , in the form page, with value comming from sessionStorage.getItem("qrleido"). Any clue about how to retrieve that value?

Thanks in advance,

 

[kaito]

Hi:

I have maden 2 modifications:

Mod 1: changed sessionStorage with localStorage in order to ensure persistance data between browsers windows

<script type="text/javascript">
    var audio = new Audio('https://media.geeksforgeeks.org/wp-content/uploads/20190531135120/beep.mp3');
    var scanner = new Instascan.Scanner({ video: document.getElementById('preview'), scanPeriod: 5, mirror: false });
    scanner.addListener('scan',function(content){
                  audio.play();
                  localStorage.setItem("qrleido", content);
                  alert(content);
                  window.close();
     });
</script>

Mod 2: changed element type from field to calc. I set "calc on save" and the calc box is:

$session = JFactory::getSession();
$myCalc=$session->get('qrleido');
return $myCalc;

But calc element doesn´t save the value (content) coming from key "qrleido".

Please, any help will be welcome