SpeechSynthesisUtterance.onstart

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

See also

• Web Speech API