SpeechSynthesis.speak() expects either a string or a SpeechSynthesisUtterance object, not a plain object
You can use Array.prototype.map() to convert the text of chapters of book to Braille.
Use data-* attribute at HTML to set JSON representation of chapters expected to be recognized by the service, for example both "chapter one" and "chapter 1" and "chapter two" and "chapter 2" respectively.
At result event of SpeechSynthesisUtterance filter <textarea> elements to select the corresponding chapter of the book as text. Restart the recognition service, e.g., webkitSpeechRecognition at end event of SpeechReconitionUtterance instance.
<!DOCTYPE html>
<html>
<head>
<title>Ethical Hacking book</title>
<style type="text/css">
body {
font-family: verdana;
}
.button {
display: inline-block;
background: #f6f6f6;
padding: 10px 20px;
color: #000;
border: 1px solid #ccc;
cursor: pointer;
margin-top: 20px;
}
.button:hover {
box-shadow: 4px 4px 10px 0 #ccc;
}
.container textarea,
.container .brailleResult {
width: 1333px;
height: 1000px;
resize: none;
outline: none;
border: 1px solid #ccc;
box-shadow: 0 0 10px 0 #ddd;
font-size: 14px;
}
</style>
</head>
<body>
<div class="container">
<h3>Ethical Hacking</h3>
<textarea class="myText" data-chapter='["chapter one", "chapter 1"]'>Chapter 1. Introduction to Hacking. There are many definitions for hacker. Ask this question from a phalanx, and you will get a new answer every time, because more mouths will have more talks, and this is the reason behind the different definitions
of hackers, which in my opinion is quite justified for everyone has a right to think differently. In the early 1990s, the word hacker was used to describe a great programmer, someone who was able to build complex logics.
</textarea>
<div class="brailleResult"></div>
<textarea class="myText" data-chapter='["chapter two", "chapter 2"]'>Chapter 2. Linux Basics. In order to become a good ethical hacker or penetration tester, you need to be conversant with Linux, which is by far one of the most powerful operating systems. Linux is really good for ethical hacking and penetration testing
because it is compatible with a wide variety of related tools and software, whereas other operating systems such as Mac and Windows support fewer of these software and tools. In this chapter, I will teach you some of the very basics of operating
a Linux OS. If you are already familiar with Linux basics, you can skip this chapter.</textarea>
<div class="brailleResult"></div>
</div>
<script type="text/javascript">
var braille = [
['1', '⠼⠁'],
['2', '⠼⠃'],
['3', '⠼⠉'],
['4', '⠼⠙'],
['5', '⠼⠑'],
['6', '⠼⠋'],
['7', '⠼⠛'],
['8', '⠼⠓'],
['9', '⠼⠊'],
['0', '⠼⠚'],
['A', '⠠⠁'],
['B', '⠠⠃'],
['C', '⠠⠉'],
['D', '⠠⠙'],
['E', '⠠⠑'],
['F', '⠠⠋'],
['G', '⠠⠛'],
['H', '⠠⠓'],
['I', '⠠⠊'],
['J', '⠠⠚'],
['K', '⠠⠅'],
['L', '⠠⠇'],
['M', '⠠⠍'],
['N', '⠠⠝'],
['O', '⠠⠕'],
['P', '⠠⠏'],
['Q', '⠠⠟'],
['R', '⠠⠗'],
['S', '⠠⠎'],
['T', '⠠⠞'],
['U', '⠠⠥'],
['V', '⠠⠧'],
['W', '⠠⠺'],
['X', '⠠⠭'],
['Y', '⠠⠽'],
['Z', '⠠⠵'],
['a', '⠁'],
['b', '⠃'],
['c', '⠉'],
['d', '⠙'],
['e', '⠑'],
['f', '⠋'],
['g', '⠛'],
['h', '⠓'],
['i', '⠊'],
['j', '⠚'],
['k', '⠅'],
['l', '⠇'],
['m', '⠍'],
['n', '⠝'],
['o', '⠕'],
['p', '⠏'],
['q', '⠟'],
['r', '⠗'],
['s', '⠎'],
['t', '⠞'],
['u', '⠥'],
['v', '⠧'],
['w', '⠺'],
['x', '⠭'],
['y', '⠽'],
['z', '⠵'],
['\\.', '⠲'],
[',', '⠂'],
['\\?', '⠦'],
[';', '⠆'],
['!', '⠖'],
['<', '⠦'],
['>', '⠴'],
['\\[', '⠶'],
['-', '⠤'],
["'", '⠄'],
];
function checkCompatibilty() {
if (!('speechSynthesis' in window)) {
alert('Your browser is not supported. If google chrome, please upgrade!');
}
};
checkCompatibilty();
var chapters = document.querySelectorAll('.myText');
var brailleResult = document.querySelectorAll(".brailleResult");
var recognition = new webkitSpeechRecognition();
recognition.continuous = true;
recognition.interimResults = false;
recognition.maxAlternatives = 1;
recognition.onresult = handleRecognition;
recognition.start();
var book = new SpeechSynthesisUtterance();
book.onend = resetRecognition;
book.default = false;
var voiceselect = window.speechSynthesis.getVoices();
book.voice = voiceselect.filter(function(voice) {
return voice.name == 'Google UK English Male';
})[0];
book.lang = 'en-EN';
book.volume = 1;
book.rate = 1;
book.pitch = 1;
function textToBraille(chapter) {
return Array.prototype.map.call(chapter, function(text) {
var result = braille.find(([key, prop]) => text === key);
return result && result[1] || text
}).join("")
}
function handleRecognition(event) {
recognition.stop();
var chapter = event.results[event.results.length - 1][0].transcript.trim();
console.log(chapter);
for (var i = 0; i < chapters.length; i++) {
if (JSON.parse(chapters[i].dataset.chapter).some(function(ch) {
return ch === chapter
})) {
speak(chapters[i].value);
brailleResult[i].innerHTML = textToBraille(chapters[i].value)
}
}
}
function resetRecognition() {
recognition.start();
}
function speak(chapter) {
book.text = chapter;
window.speechSynthesis.speak(book);
};
</script>
</body>
</html>
plnkr https://plnkr.co/edit/Xwc5iFtgbTnz13DDKC3z?p=preview
