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    SpeechSynthesisUtterance.onstart

    This is an experimental technology
    Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

    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

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 33 44 (44) [1] Not supported Not supported Not supported
    Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support ? (Yes) ? 2.5 Not supported Not supported Not supported
    • [1] Can be enabled via the media.webspeech.synth.enabled flag in about:config.

    See also

    Document Tags and Contributors

    Tags: 
     Contributors to this page: chrisdavidmills
     Last updated by: chrisdavidmills,