TOPIC:

   <script 
 src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
 

  <script type="text/javascript">
        function generateBarCode()
        {
           //inputs fileds
            var nric = $('#text').val();
            var nric1 = $('#text1').val();
            var nric2 = $('#text2').val();

//new url with input fields           
 var url = 'https://api.qrserver.com/v1/create-qr-code/?data=' +nric + ','+nric1+','+nric2+'&amp;size=50x50';                       

//new url attached to the image            
$('#barcode').attr('src', url);

        }
    </script>