NDEFReadingEvent: message property

Secure contextLimited availability

The message property of the NDEFReadingEvent interface returns an NDEFMessage object containing the received message.

Value

An NDEFMessage object.

Examples

This example shows how to create a convenience function that reads a single tag and then stops polling, saving battery life by cutting unneeded work. The example could easily be extended to time out after a given amount of milliseconds.

const ndefReader = new NDEFReader();

function read() {
  return new Promise((resolve, reject) => {
    const controller = new AbortController();
    controller.signal.onabort = reject;
    ndefReader.addEventListener(
      "reading",
      (event) => {
        controller.abort();
        resolve(event);
      },
      { once: true },
    );
    ndefReader.scan({ signal: controller.signal }).catch((err) => reject(err));
  });
}

read().then(({ serialNumber }) => {
  console.log(serialNumber);
});

Specifications

Browser compatibility