SpeechSynthesis: voiceschanged event

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

The voiceschanged event of the Web Speech API is fired when the list of SpeechSynthesisVoice objects that would be returned by the SpeechSynthesis.getVoices() method has changed (when the voiceschanged event fires.)

Bubbles No
Cancelable No
Interface Event
Event handler property onvoiceschanged

Examples

This could be used to repopulate a list of voices that the user can choose between when the event fires. You can use the voiceschanged event in an addEventListener method:

var synth = window.speechSynthesis;

synth.addEventListener('voiceschanged', function() {
  var voices = synth.getVoices();
  for(i = 0; i < voices.length ; i++) {
    var option = document.createElement('option');
    option.textContent = voices[i].name + ' (' + voices[i].lang + ')';
    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);
    voiceSelect.appendChild(option);
  }
});

Or use the onvoiceschanged event handler property:

var synth = window.speechSynthesis;
synth.onvoiceschanged = function() {
  var voices = synth.getVoices();
  for(i = 0; i < voices.length ; i++) {
    var option = document.createElement('option');
    option.textContent = voices[i].name + ' (' + voices[i].lang + ')';
    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);
    voiceSelect.appendChild(option);
  }
}

Specifications

Specification
Web Speech API
# eventdef-speechsynthesis-voiceschanged

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
voiceschanged_event
33
14
49
No
21
7
No
33
62
No
7
3.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis/voiceschanged_event