SpeechSynthesisUtterance.onstart

Experimental

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

The onstart property of the SpeechSynthesisUtterance interface represents an event handler that will run when the utterance has begun to be spoken (when the start event fires.)

This occurs when the SpeechSynthesis.speak() method is invoked.

Syntax

speechSynthesisUtteranceInstance.onstart = function() { ... };

Examples

var synth = window.speechSynthesis;

var inputForm = document.querySelector('form');
var inputTxt = document.querySelector('input');
var voiceSelect = document.querySelector('select');

var voices = synth.getVoices();

  ...

inputForm.onsubmit = function(event) {
  event.preventDefault();

  var utterThis = new SpeechSynthesisUtterance(inputTxt.value);
  var selectedOption = voiceSelect.selectedOptions[0].getAttribute('data-name');
  for(i = 0; i < voices.length ; i++) {
    if(voices[i].name === selectedOption) {
      utterThis.voice = voices[i];
    }
  }

  synth.speak(utterThis);

  utterThis.onstart = function(event) {
    console.log('We have started uttering this speech: ' + event.utterance.text);
  }

  inputTxt.blur();
}

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also