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HTML

              
                <div id="wrapper">
  <h1>Multilingual Text To Speech</h1>
  <div class="uiunit">
    <label for="speakerMenu">Voice: </label>
    <select id="speakerMenu"></select>  speaks 
    <span id="language">English.</span>
  </div>
  <p id="warning">Sorry, your browser does not support the Speech Synthesis API.</p>

  <textarea id="txtFld">Choose any voice. Type here in the chosen language.</textarea>
  <label for="txtFld">Type text above in the selected language (or copy from Google Translate). Then click the Speak button.</label>
  <div>
    <button type="button" id="speakBtn">Speak</button>
    <br>
    <p>Note: For best results on a Mac, use the latest version of Chrome, Safari, or FireFox. On Windows, use Chrome.</p>
  </div>

</div>
              
            
!

CSS

              
                @charset "UTF-8";
*, *:before, *:after {box-sizing: border-box;}
:root {
  --textcolor:black;
  --accentcolor:#269;
  --lightaccentcolor:#9df;
  --reversecolor:white;
}
html {
  font-size: 16px;
  font-family: Trebuchet,sans-serif;
}
body {
  background: var(--accentcolor);
  color: var(--reversecolor);
  margin: 0;
  padding: 0;
  line-height: 1.5;
}
strong, b {font-weight: bold;}
#wrapper {
  margin: 0 auto;
  padding: 1.2rem;
  width: 100%;
  height: auto;
  min-width: 320px;
  max-width: 960px;
  background: var(--reversecolor);
  color: var(--textcolor);
  text-align: left;
  border:2px solid var(--accentcolor);
  border-radius:0 0 16px 16px;
  box-shadow:4px 4px 16px #333;
}
h1 {
  color: var(--accentcolor);
  font-size: 3rem; 
  margin: 0;
}
p {
  display:block;
  font-size: 1rem; 
  margin: 1rem 0 1rem 0;
}
a:link, a:visited {color: var(--accentcolor);}
a:hover {text-decoration: none;}

#txtFld {
  width: 100%;
  height: 4.4rem;
  font-size: 1.6rem;
  font-family: inherit;
}
button {
  -webkit-appearance: none;
  font-size: 1.4rem;
  font-weight: normal;
  background: var(--lightaccentcolor);
  border-radius: 12px;
  border: 2px solid var(--accentcolor);
  color: var(--textcolor);
  padding: 0.3rem 0.5rem 0.3rem 0.5rem;
  cursor: pointer;
  margin: 10px 20px 10px 20px;
}
button:hover {
  color: var(--reversecolor);
  background: var(--accentcolor);
}
button:disabled{
  opacity:0.3;
  cursor: not-allowed;
}
.uiunit {
  display: inline-block;
  margin: 1rem;
  text-align: left;
}
#warning {
  color: red;
  font-size: 1.4rem;
  display: none;
}
              
            
!

JS

              
                let speakBtn, txtFld, speakerMenu, language;
let allVoices, langtags;
let voiceIndex = 0;

function init(){
  speakBtn = qs("#speakBtn");
  txtFld = qs("#txtFld"); 
  speakerMenu = qs("#speakerMenu");
  language = qs("#language");
  langtags = getLanguageTags();
  speakBtn.addEventListener("click",talk,false);
  speakerMenu.addEventListener("change",selectSpeaker,false);
  if (window.speechSynthesis) {
    if (speechSynthesis.onvoiceschanged !== undefined) {
      //Chrome gets the voices asynchronously so this is needed
      speechSynthesis.onvoiceschanged = setUpVoices;
    }
    setUpVoices(); //for all the other browsers
  }else{
    speakBtn.disabled = true;
    speakerMenu.disabled = true;
    qs("#warning").style.display = "block";
  }
}
function setUpVoices(){
  allVoices = getAllVoices();
  createSpeakerMenu(allVoices);
}
function getAllVoices() {
  let voicesall = speechSynthesis.getVoices();
  let vuris = [];
  let voices = [];
  voicesall.forEach(function(obj,index){
    let uri = obj.voiceURI;
    if (!vuris.includes(uri)){
      vuris.push(uri);
      voices.push(obj);
    }
  });
  voices.forEach(function(obj,index){obj.id = index;});
  return voices;
}
function createSpeakerMenu(voices){
  let code = ``;
  voices.forEach(function(vobj,i){
    code += `<option value=${vobj.id}>`;
    code += `${vobj.name} (${vobj.lang})`;
    code += vobj.voiceURI.includes(".premium") ? ' (premium)' : ``;
    code += `</option>`;
  });
  speakerMenu.innerHTML = code;
  speakerMenu.selectedIndex = voiceIndex;
}
//code for when the user selects a speaker
function selectSpeaker(){
  voiceIndex = speakerMenu.selectedIndex;
  let sval = Number(speakerMenu.value);
  let voice = allVoices[sval];
  let langcode = voice.lang.substring(0,2);
  let langcodeobj = searchObjects(langtags,"code",langcode);
  language.innerHTML = langcodeobj[0].name;
}
function talk(){
  let sval = Number(speakerMenu.value);
  let u = new SpeechSynthesisUtterance();
  u.voice = allVoices[sval];
  u.lang = u.voice.lang;
  u.text = txtFld.value;
  u.rate = 0.8;
  speechSynthesis.speak(u);
}
function getLanguageTags(){
  let langs = ["ar-Arabic","cs-Czech","da-Danish","de-German","el-Greek","en-English","eo-Esperanto","es-Spanish","et-Estonian","fi-Finnish","fr-French","he-Hebrew","hi-Hindi","hu-Hungarian","id-Indonesian","it-Italian","ja-Japanese","ko-Korean","la-Latin","lt-Lithuanian","lv-Latvian","nb-Norwegian Bokmal","nl-Dutch","nn-Norwegian Nynorsk","no-Norwegian","pl-Polish","pt-Portuguese","ro-Romanian","ru-Russian","sk-Slovak","sl-Slovenian","sq-Albanian","sr-Serbian","sv-Swedish","th-Thai","tr-Turkish","zh-Chinese"];
  let langobjects = [];
  for (let i=0;i<langs.length;i++){
    let langparts = langs[i].split("-");
    langobjects.push({"code":langparts[0],"name":langparts[1]});
  }
  return langobjects;
}
// Generic utility functions
function searchObjects(array,prop,term,casesensitive = false){
  //searches an array of objects for a given term in a given property
  //returns only those objects that test positive
  let regex = new RegExp(term, casesensitive ? "" : "i");
  let newArrayOfObjects = array.filter(obj => regex.test(obj[prop]));
  return newArrayOfObjects;
}
function qs(selectorText){
  //saves lots of typing for those who eschew Jquery
  return document.querySelector(selectorText);
}
document.addEventListener('DOMContentLoaded', function (e) {
  try {init();} catch (error){
    console.log("Data didn't load", error);}
});
              
            
!
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