How to check the camera permissions programmatically in Dynamsoft Barcode Reader JavaScript SDK?

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Starting from version 9.6.10+, you can utilize the testCameraAccess method to check the camera status programmatically.

For versions older than 9.6.10, you can check the status using a try-catch block as shown below:

try {
  await scanner.open(); // or 'await scanner.show()'
} catch(e) {
  if(e.name === "NotAllowedError") {
    // it means the user denied permission  
    // add your code here to guide users to grant permission
  }
}

In case permission is denied, you can prompt the user (using an alert or something similar) to manually grant permission for your website to access the camera via the site settings.