NDEFReadingEvent.message

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

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

Syntax

let aMessage = NDEFReadingEvent.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 ctlr = new AbortController();
      ctlr.signal.onabort = reject;
      ndefReader.addEventListener("reading", event => {
        ctlr.abort();
        resolve(event);
      }, { once: true });
      ndefReader.scan({ signal: ctlr.signal }).catch(err => reject(err));
    });
  }

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

Specifications

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Browser compatibility

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