SpeechRecognition: nomatch event

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The nomatch event of the Web Speech API is fired when the speech recognition service returns a final result with no significant recognition.

This may involve some degree of recognition, which doesn't meet or exceed the confidence threshold.

Syntax

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

addEventListener("nomatch", (event) => { })

onnomatch = (event) => { }

Event type

A SpeechRecognitionEvent. Inherits from Event.

Event properties

In addition to the properties listed below, properties from the parent interface, Event, are available.

SpeechRecognitionEvent.emma Read only: Returns an Extensible MultiModal Annotation markup language (EMMA) — XML — representation of the result.
SpeechRecognitionEvent.interpretation Read only: Returns the semantic meaning of what the user said.
SpeechRecognitionEvent.resultIndex Read only: Returns the lowest index value result in the SpeechRecognitionResultList "array" that has actually changed.
SpeechRecognitionEvent.results Read only: Returns a SpeechRecognitionResultList object representing all the speech recognition results for the current session.

Examples

You can use the nomatch event in an addEventListener method:

const recognition = new (SpeechRecognition || webkitSpeechRecognition)();

recognition.addEventListener("nomatch", () => {
  console.error("Speech not recognized");
});

Or use the onnomatch event handler property:

recognition.onnomatch = () => {
  console.error("Speech not recognized");
};

Specifications

Specification
Web Speech API # eventdef-speechrecognition-nomatch
Web Speech API # dom-speechrecognition-onnomatch