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) { var color = event.results[0][0].transcript; diagnostic.textContent = 'Result received: ' + color + '.'; 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 |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 33 [1] | 44 (44) [2] | No support | No support | No support |
Feature | Android | Chrome | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic support | ? | (Yes)[1] | ? | 2.5 | No support | No support | No support |
- [1] Speech recognition interfaces are currently prefixed on Chrome, so you'll need to prefix interface names appropriately, e.g.
webkitSpeechRecognition
; You'll also need to serve your code through a web server for recognition to work. - [2] Can be enabled via the
media.webspeech.recognition.enable
flag in about:config, although note that currently speech recognition won't work on Desktop Firefox — it will be properly exposed soon, once the required internal permissions are sorted out.
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"