extra_js_function_to_call = $function_name;
}
function add_button($barcodeInputId, $index = 0, $style = "")
{
$barcodeInputId = htmlspecialchars($barcodeInputId, ENT_QUOTES, 'UTF-8');
$uniqueId = 'barcode-scan-area-' . $index;
$startButtonId = 'barcode-start-button-' . $index;
$videoAreaId = 'barcode-video-area-' . $index;
$videoStreamId = 'barcode-video-stream-' . $index;
$videoCanvasId = 'barcode-video-canvas-' . $index;
?>