Docs4dev
Docs
dom / latest / ndefreader / readingerror_event.html

NDEFReader: readingerror event

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

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The readingerror event of the NDEFReader interface is fired whenever an error occurs during reading of NFC tags, e.g. when tags leave the reader's magnetic induction field.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js

addEventListener("readingerror", (event) => {});

onreadingerror = (event) => {};

Event type

A generic Event.

Examples

The following example shows how to process events using both the onreading and onreadingerror event handlers.

js

const ndef = new NDEFReader();
ndef
  .scan()
  .then(() => {
    console.log("Scan started successfully.");
    ndef.onreadingerror = (event) => {
      console.log(
        "Error! Cannot read data from the NFC tag. Try a different one?",
      );
    };
    ndef.onreading = (event) => {
      console.log("NDEF message read.");
    };
  })
  .catch((error) => {
    console.log(`Error! Scan failed to start: ${error}.`);
  });

Specifications

Specification
Web NFC API
# dom-ndefreader-onreadingerror

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
readingerror_event No No No No No No 89 89 No 63 No 15.0

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/NDEFReader/readingerror_event