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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">
<title>Voice Assistant Demo</title>
<style>
body {
font-family: system-ui, -apple-system, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f0f0f0;
}
.container {
background: white;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.status {
margin: 20px 0;
padding: 10px;
border-radius: 4px;
background: #e8f5e9;
}
.transcript {
margin: 20px 0;
padding: 15px;
background: #f5f5f5;
border-radius: 4px;
min-height: 50px;
}
button {
background: #2196F3;
color: white;
border: none;
padding: 10px 20px;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
}
button:hover {
background: #1976D2;
}
button:disabled {
background: #ccc;
cursor: not-allowed;
}
.controls {
display: flex;
gap: 10px;
margin: 20px 0;
}
.voice-settings {
margin: 20px 0;
padding: 15px;
background: #f8f9fa;
border-radius: 4px;
}
.setting-group {
margin: 10px 0;
}
label {
display: inline-block;
width: 100px;
}
.error {
background: #ffebee;
color: #c62828;
padding: 10px;
border-radius: 4px;
margin: 10px 0;
display: none;
}
</style>
</head>
<body>
<div class="container">
<h1>Voice Assistant Demo</h1>
<p>Click "Start Listening" and speak a command. Try saying:</p>
<ul>
<li>"Hello" - The assistant will greet you back</li>
<li>"What time is it?" - Get the current time</li>
<li>"Tell me a fact" - Hear an interesting fact</li>
</ul>
<div class="controls">
<button id="startBtn">Start Listening</button>
<button id="stopBtn" disabled>Stop Listening</button>
</div>
<div class="error" id="error"></div>
<div class="status" id="status">Status: Ready</div>
<div class="transcript" id="transcript"></div>
<div class="voice-settings">
<h3>Voice Settings</h3>
<div class="setting-group">
<label for="voice">Voice:</label>
<select id="voice"></select>
</div>
<div class="setting-group">
<label for="rate">Rate:</label>
<input type="range" id="rate" min="0.5" max="2" value="1" step="0.1">
<span id="rateValue">1</span>
</div>
<div class="setting-group">
<label for="pitch">Pitch:</label>
<input type="range" id="pitch" min="0.5" max="2" value="1" step="0.1">
<span id="pitchValue">1</span>
</div>
</div>
</div>
<script>
// Check if speech recognition is supported
if (!('webkitSpeechRecognition' in window) && !('SpeechRecognition' in window)) {
document.getElementById('error').style.display = 'block';
document.getElementById('error').textContent = 'Speech recognition is not supported in this browser. Please try Chrome.';
document.getElementById('startBtn').disabled = true;
}
// Initialize speech recognition
const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
const recognition = new SpeechRecognition();
// Configure recognition
recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;
// Initialize speech synthesis
const synth = window.speechSynthesis;
let voices = [];
// DOM elements
const startBtn = document.getElementById('startBtn');
const stopBtn = document.getElementById('stopBtn');
const status = document.getElementById('status');
const transcript = document.getElementById('transcript');
const voiceSelect = document.getElementById('voice');
const rate = document.getElementById('rate');
const pitch = document.getElementById('pitch');
const rateValue = document.getElementById('rateValue');
const pitchValue = document.getElementById('pitchValue');
const errorDiv = document.getElementById('error');
// Populate voice list
function populateVoices() {
voices = synth.getVoices();
voiceSelect.innerHTML = '';
voices.forEach((voice, i) => {
const option = document.createElement('option');
option.textContent = `${voice.name} (${voice.lang})`;
option.setAttribute('data-name', voice.name);
voiceSelect.appendChild(option);
});
}
populateVoices();
if (speechSynthesis.onvoiceschanged !== undefined) {
speechSynthesis.onvoiceschanged = populateVoices;
}
// Speech synthesis function
function speak(text) {
if (synth.speaking) {
console.error('speechSynthesis.speaking');
return;
}
const utterance = new SpeechSynthesisUtterance(text);
const selectedVoice = voices[voiceSelect.selectedIndex];
utterance.voice = selectedVoice;
utterance.rate = rate.value;
utterance.pitch = pitch.value;
synth.speak(utterance);
}
// Handle commands
function handleCommand(command) {
command = command.toLowerCase();
let response = '';
if (command.includes('hello')) {
response = 'Hello! How can I help you today?';
} else if (command.includes('what time')) {
const now = new Date();
response = `The current time is ${now.toLocaleTimeString()}`;
} else if (command.includes('tell me a fact')) {
const facts = [
'The shortest war in history was between Britain and Zanzibar on August 27, 1896. Zanzibar surrendered after just 38 minutes.',
'Honey never spoils. Archaeologists have found pots of honey in ancient Egyptian tombs that are over 3,000 years old and still perfectly good to eat.',
'The first oranges weren't orange. The original oranges from Southeast Asia were actually green.',
];
response = facts[Math.floor(Math.random() * facts.length)];
} else {
response = "I'm sorry, I didn't understand that command. Please try again.";
}
transcript.textContent = `You said: ${command}\nAssistant: ${response}`;
speak(response);
}
// Event listeners
startBtn.addEventListener('click', () => {
errorDiv.style.display = 'none';
try {
recognition.start();
startBtn.disabled = true;
stopBtn.disabled = false;
status.textContent = 'Status: Listening...';
console.log('Recognition started');
} catch (err) {
console.error('Recognition error:', err);
errorDiv.style.display = 'block';
errorDiv.textContent = `Error starting recognition: ${err.message}`;
}
});
stopBtn.addEventListener('click', () => {
try {
recognition.stop();
startBtn.disabled = false;
stopBtn.disabled = true;
status.textContent = 'Status: Stopped';
} catch (err) {
console.error('Stop error:', err);
errorDiv.style.display = 'block';
errorDiv.textContent = `Error stopping recognition: ${err.message}`;
}
});
recognition.onstart = () => {
console.log('Recognition started');
status.textContent = 'Status: Listening...';
};
recognition.onresult = (event) => {
console.log('Recognition result received');
const command = event.results[0][0].transcript;
handleCommand(command);
};
recognition.onend = () => {
console.log('Recognition ended');
startBtn.disabled = false;
stopBtn.disabled = true;
status.textContent = 'Status: Ready';
};
recognition.onerror = (event) => {
console.error('Recognition error:', event.error);
errorDiv.style.display = 'block';
errorDiv.textContent = `Error: ${event.error}. ${event.error === 'not-allowed' ? 'Please ensure microphone permissions are granted.' : ''}`;
status.textContent = 'Status: Error';
startBtn.disabled = false;
stopBtn.disabled = true;
};
// Voice setting controls
rate.addEventListener('input', () => {
rateValue.textContent = rate.value;
});
pitch.addEventListener('input', () => {
pitchValue.textContent = pitch.value;
});
</script>
</body>
</html> |