demos/text-to-speech/index.html at gh-pages · justmarkup/demos · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Text to speech demo</title>
    <style>
        html {
            font-family: Arial, Helvetica, sans-serif;
            margin: 0;
        }

        body {
            width: 600px;
            max-width: 90%;
            margin: 20px auto;
        }

        label {
            display: block;
        }

        textarea {
            width: 100%;
            height: 50vh;
            padding: 10px;
            margin: 4px 0 20px 0;
        }
    </style>
</head>

<body>
    <h1>Text to speech</h1>
    <noscript id="nosupport">
        <p>Your browser doesn't support Text to Speech</p>
    </noscript>

    <label for="text">Text</label>
    <textarea name="text" id="text" data-tts-text>This is a text</textarea>
    <div data-tts>
        <select name="voices" id="voices" hidden data-tts-select></select>
        <button hidden data-tts-play>Play</button>
        <button hidden data-tts-pause>Pause</button>
        <button hidden data-tts-resume>Resume</button>
    </div>
    <script>
        if ('speechSynthesis' in window) {
            const synthesis = window.speechSynthesis;
            const voiceSelect = document.querySelector('[data-tts-select]');
            const playButton = document.querySelector('[data-tts-play]');
            const pauseButton = document.querySelector('[data-tts-pause]');
            const resumeButton = document.querySelector('[data-tts-resume]');
            const textarea = document.querySelector('[data-tts-text]');
            let text = false;
            let chosenVoice = false;
            let isPlaying = false;
            let voices;

            const getText = () => {
                return textarea.value.replace(/\n\n/g, ', ');
            };

            const play = () => {
                if (!text) {
                    text = getText()
                }
                const utterance = new SpeechSynthesisUtterance(text);

                if (chosenVoice) {
                    utterance.voice = chosenVoice;
                }

                // Speak the utterance
                synthesis.speak(utterance);
                isPlaying = true;
                pauseButton.hidden = false;
                playButton.hidden = true;
                resumeButton.hidden = true;

                // somehow chrome stops after 14seconds, so resume from there
                var r = setInterval(() => {
                    if (!isPlaying) {
                        clearInterval(r);
                    } else {
                        synthesis.resume();
                    }
                }, 14000);

                window.addEventListener('beforeunload', () => {
                    clearInterval(r);
                    synthesis.cancel();
                });


                utterance.onend = () => {
                    isPlaying = false;
                    playButton.hidden = false;
                    pauseButton.hidden = true;
                    resumeButton.hidden = true;
                    text = false;
                }
            };

            const pause = () => {
                synthesis.pause();
                isPlaying = false;
                pauseButton.hidden = true;
                resumeButton.hidden = false;
                playButton.hidden = true;
            };

            const resume = () => {
                synthesis.resume();
                isPlaying = true;
                pauseButton.hidden = false;
                resumeButton.hidden = true;
                playButton.hidden = true;
            }

            const setVoices = () => {
                voices = synthesis.getVoices();
                // Log the properties of the voices in the list
                if (voices && voices.length && voices.length > 0) {
                    voices.forEach(function(voice) {
                        const voiceOption = document.createElement('option');
                        voiceOption.innerText = voice.name;
                        voiceSelect.appendChild(voiceOption);
                    });
                    voiceSelect.hidden = false;
                    voiceSelect.addEventListener('change', (ev) => {
                        chosenVoice = voices.filter((voice) => {
                            return voice.name === ev.target.value;
                        })[0];
                    });

                    playButton.hidden = false;
                    playButton.addEventListener('click', () => {
                        play();
                    });

                    pauseButton.addEventListener('click', () => {
                        pause();
                    });

                    resumeButton.addEventListener('click', () => {
                        resume();
                    });

                    textarea.addEventListener('keyup', (ev) => {
                        text = ev.target.value.replace(/\n\n/g, ', ');
                        isPlaying = false;
                        synthesis.cancel();
                        playButton.hidden = false;
                        pauseButton.hidden = true;
                        resumeButton.hidden = true;
                    });

                }
            };

            setTimeout(function() {
                setVoices();
            }, 50)


        } else {
            document.documentElement.innerHTML = document.getElementById('nosupport').innerHTML;
        }
    </script>
</body>

</html>