NDEFReader: readingerror event
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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 addEventListener():
js
addEventListener("readingerror", (event) => { })
Alternatively, assign to the event handler property of the interface:
js
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 # dom-ndefreader-onreadingerror |