SpeechSynthesis: voiceschanged event

Baseline

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This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2022.

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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.)

Syntax

Use the event name in addEventListener():

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

Alternatively, assign to the event handler property of the interface:

onvoiceschanged = (event) => { }

Event type

A generic Event with no added properties.

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:

const synth = window.speechSynthesis;

synth.addEventListener("voiceschanged", () => {
  const voices = synth.getVoices();
  for (const voice of voices) {
    const option = document.createElement("option");
    option.textContent = `${voice.name} (${voice.lang})`;
    option.setAttribute("data-lang", voice.lang);
    option.setAttribute("data-name", voice.name);
    voiceSelect.appendChild(option);
  }
});

Or use the onvoiceschanged event handler property (but note that this replaces other event listeners added using onvoiceschanged, if any):

const synth = window.speechSynthesis;
synth.onvoiceschanged = () => {
  const voices = synth.getVoices();
  for (const voice of voices) {
    const option = document.createElement("option");
    option.textContent = `${voice.name} (${voice.lang})`;
    option.setAttribute("data-lang", voice.lang);
    option.setAttribute("data-name", voice.name);
    voiceSelect.appendChild(option);
  }
};