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
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onstart | Chrome Full support 33 | Edge Full support 14 | Firefox Full support 49 | IE No support No | Opera Full support 21 | Safari Full support 7 | WebView Android No support No | Chrome Android Full support 33 | Firefox Android
Full support
62
| Opera Android No support No | Safari iOS Full support 7 | Samsung Internet Android Full support 3.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- User must explicitly enable this feature.
- User must explicitly enable this feature.