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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta viewport="width=device-width, initial-scale=1.0">
<!--
Based on:
Experimenting With speechSynthesis
by Aaron Gustafson
Smashing Magazine
2017-02-14
https://www.smashingmagazine.com/2017/02/experimenting-with-speechsynthesis/
---
And the Mozilla Developer Network (MDN) SpeechSynthesis API documentation:
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis
-->
<title>Speaker</title>
<style>
body {
font-family: sans-serif, serif;
}
#app {
margin: 0 auto;
max-width: 1000px;
width: 100%;
}
#app h1 {
text-align: center;
}
#app fieldset {
border: 0;
padding: 20px;
}
#app fieldset legend {
font-weight: bold;
}
#app fieldset ul {
list-style: none;
margin: 0;
padding: 0;
}
#app fieldset li {
margin-bottom: 15px;
}
#app fieldset li label {
display: inline-block;
max-width: 230px;
width: 25%;
}
#app fieldset li input,
#app fieldset li select
{
display: inline-block;
max-width: 700px;
width: 75%;
}
#app fieldset li input[type="text"] {
max-width: 696px;
}
#app fieldset li input[type="range"] {
max-width: 640px;
}
#app fieldset textarea {
max-width: 996px;
width: 100%;
}
#app fieldset #controls {
margin: 20px 0;
}
#controls li {
display: inline-block;
}
#app .range-label {
display: inline-block;
text-align: center;
width: 30px;
}
</style>
</head>
<body>
<div id="app">
<h1>Speaker</h1>
<form>
<fieldset>
<legend>Speaker Preferences</legend>
<ul>
<li>
<label for="voice">Voice:</label>
<select name="Voice" id="voice">
<option>Select a voice...</option>
</select>
</li>
<li>
<label for="rate">Speech Rate:</label>
<span class="range-label">0.1</span> <input type="range" name="Rate" id="rate" min="0.1" max="2.0" step="0.1" value="1.0" list="rates"> <span class="range-label">2.0</span>
<datalist id="rates">
<option value="0.5"></option>
<option value="0.7"></option>
<option value="1.0"></option>
<option value="1.5"></option>
<option value="1.7"></option>
</datalist>
</li>
<li>
<label for="pitch">Pitch:</label>
<span class="range-label">0.1</span> <input type="range" name="Pitch" id="pitch" min="0.1" max="2.0" step="0.1" value="1.0" list="pitches"> <span class="range-label">2.0</span>
<datalist id="pitches">
<option value="0.5"></option>
<option value="0.7"></option>
<option value="1.0"></option>
<option value="1.5"></option>
<option value="1.7"></option>
</datalist>
</li>
</ul>
</fieldset>
<fieldset>
<legend>Text to Speak</legend>
<div>
<label for="speaktext" style="display: none;">Enter text to speak</label>
<textarea name="TextToSpeak" id="speaktext" cols="100" rows="5"></textarea>
</div>
<ul id="controls">
<li><button type="button" id="doSpeakText">Speak</button></li>
<li style="display: none"><button type="button" id="doPauseSpeaking">Pause</button></li>
<li style="display: none"><button type="button" id="doStopSpeaking">Stop</button></li>
<li><button type="button" id="doClearText">Clear Text</button></li>
<li style="display: none"><progress id="speechProgress" max="100" value="0">0/100</progress></li>
</ul>
</fieldset>
</form>
</div>
<script>
const speechEngine = window.speechSynthesis
const voices = {
"en-GB": [],
"en-US": [],
}
const setVoices = (voicelist) => {
voices["en-GB"] = voicelist.filter((v) => v.lang === "en-GB")
voices["en-US"] = voicelist.filter((v) => v.lang === "en-US")
}
// Firefox returns a *CORNUCOPIA* of voices (they're pretty "old school" speech synthesis though)... and Chrome needs an event listener to record the list
// English language options are "en-029", "en-GB", "en-GB-SCOTLAND", "en-GB-X-GBCLAN", "en-GB-X-GBCWMD", "en-GB-X-RP", "en-US", "en-US-NYC"
let voicelist = speechEngine.getVoices()
speechEngine.addEventListener("voiceschanged", () => {
voicelist = speechEngine.getVoices()
setVoices(voicelist)
app.populateVoiceList(voices)
})
class App {
self = this
ui = {
container: undefined,
buttons: {
speak: undefined,
pause: undefined,
stop: undefined,
clear: undefined,
},
inputs: {
voice: undefined,
rate: undefined,
pitch: undefined,
text: undefined,
},
progress: undefined,
}
constructor(appSelector) {
self = this
self.ui.container = document.querySelector(appSelector)
self.ui.inputs.voice = self.ui.container.querySelector("#voice")
self.ui.inputs.rate = self.ui.container.querySelector("#rate")
self.ui.inputs.pitch = self.ui.container.querySelector("#pitch")
self.ui.inputs.text = self.ui.container.querySelector("#speaktext")
self.ui.buttons.speak = self.ui.container.querySelector("#doSpeakText")
self.ui.buttons.pause = self.ui.container.querySelector("#doPauseSpeaking")
self.ui.buttons.stop = self.ui.container.querySelector("#doStopSpeaking")
self.ui.buttons.clear = self.ui.container.querySelector("#doClearText")
self.ui.progress = self.ui.container.querySelector("#speechProgress")
if (self.ui.buttons.speak) {
self.ui.buttons.speak.addEventListener("click", () => { self.doSpeak() })
}
if (self.ui.buttons.clear) {
self.ui.buttons.clear.addEventListener("click", () => { self.doClearText() })
}
}
populateVoiceList(voices) {
const voiceKeys = Object.keys(voices)
if (voiceKeys.length > 0) {
self.ui.inputs.voice.innerHTML = "<option>Select a voice...</option>"
let voiceItems = []
voiceKeys.forEach((k) => {
voices[k].forEach((v) => {
let friendlyLang = "English"
switch (v.lang) {
case "en-GB":
friendlyLang = "English (Britain)"
break
case "en-US":
friendlyLang = "English (US)"
break
default:
// PASS:
}
let friendlyName = v.voiceURI.search("moz-tts") >= 0
? (v.voiceURI.split("+").length > 1 ? v.voiceURI.split("+")[1].replace(`?${v.lang}`, "") : v.voiceURI)
: v.voiceURI
if (friendlyName.length > 0) {
friendlyName = friendlyName.substring(0, 1).toUpperCase() + friendlyName.substring(1)
}
voiceItems.push({
lang: friendlyLang,
uri: v.voiceURI,
name: friendlyName
})
})
})
if (voiceItems.length > 0) {
voiceItems.sort((a, b) => {
if (a.lang < b.lang) {
return -1
}
else if (a.lang > b.lang) {
return 1
}
else {
if (a.name < b.name) {
return -1
}
else if (a.name > b.name) {
return 1
}
}
return 0
})
let currentLang = ""
let currentOptGroup = undefined
voiceItems.forEach((i) => {
if (voiceItems.length > 10) {
if (currentLang !== i.lang) {
if (currentOptGroup !== undefined) {
self.ui.inputs.voice.appendChild(currentOptGroup)
}
currentOptGroup = document.createElement("optgroup")
currentOptGroup.label = i.lang
}
}
let opt = document.createElement("option")
opt.value = i.uri
opt.innerHTML = i.name
if (currentOptGroup !== undefined) {
currentOptGroup.append(opt)
}
else {
self.ui.inputs.voice.appendChild(opt)
}
currentLang = i.lang
})
// make sure to catch the final optgroup
if (currentOptGroup !== undefined) {
self.ui.inputs.voice.appendChild(currentOptGroup)
}
}
}
}
doSpeak() {
const voice = self.ui.inputs.voice.value
const rate = self.ui.inputs.rate.value
const pitch = self.ui.inputs.pitch.value
const text = self.ui.inputs.text.value
if (voice.length > 0 && text.length > 0) {
const speaker = new Speaker(voice, rate, pitch)
speaker.speak(text)
}
}
doClearText() {
self.ui.inputs.text.value = ""
}
}
class Speaker {
voice = undefined
rate = 1.0
pitch = 1.0
constructor(voice, rate, pitch) {
this.voice = voice
this.rate = rate || 1.0
this.pitch = pitch || 1.0
}
speak(text) {
if (text.length > 0 && this.voice.length > 0) {
const utterance = new SpeechSynthesisUtterance(text)
utterance.rate = this.rate
utterance.pitch = this.pitch
utterance.voice = voicelist.find((v) => v.voiceURI === this.voice)
speechEngine.speak(utterance)
}
}
}
// Firefox will be fine here, Chrome will use the event listener above...
setVoices(voicelist)
const app = new App("#app")
app.populateVoiceList(voices)
</script>
</body>
</html>