SpeechRecognitionEvent.resultIndex

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

The resultIndex read-only property of the SpeechRecognitionEvent interface returns the lowest index value result in the SpeechRecognitionResultList "array" that has actually changed.

The SpeechRecognitionResultList object is not an array, but it has a getter that allows it to be accessed by array syntax.

Syntax

var myResultIndex = event.resultIndex;

Value

A number.

Examples

recognition.onresult = function(event) {
Ā  var color = event.results[0][0].transcript;
Ā  diagnostic.textContent = 'Result received: ' + color + '.';
Ā  bg.style.backgroundColor = color;
  console.log(event.resultIndex); // returns 0 if there is only one result
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'resultIndex' in that specification.
Draft Ā 

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
resultIndex
Experimental
Chrome Full support 33
Prefixed Notes
Full support 33
Prefixed Notes
Prefixed Implemented with the vendor prefix: webkit
Notes You'll need to serve your code through a web server for recognition to work.
Edge ? Firefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android Full support Yes
Prefixed Notes
Full support Yes
Prefixed Notes
Prefixed Implemented with the vendor prefix: webkit
Notes You'll need to serve your code through a web server for recognition to work.
Chrome Android Full support Yes
Prefixed Notes
Full support Yes
Prefixed Notes
Prefixed Implemented with the vendor prefix: webkit
Notes You'll need to serve your code through a web server for recognition to work.
Firefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android ?

Legend

Full support Ā 
Full support
No support Ā 
No support
Compatibility unknown Ā 
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

Firefox OS permissions

To use speech recognition in an app, you need to specify the following permissions in your manifest:

"permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  },
  "speech-recognition" : {
    "description" : "Speech recognition"
  }
}

You also need a privileged app, so you need to include this as well:

  "type": "privileged"

See also