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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>SSE Client Example</title>
<style>
body {
font-family: Arial, sans-serif;
max-width: 1200px;
margin: 0 auto;
padding: 20px;
background-color: #f5f5f5;
}
.container {
background: white;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
margin-bottom: 20px;
}
.controls {
display: flex;
gap: 10px;
flex-wrap: wrap;
margin-bottom: 20px;
}
button {
padding: 10px 15px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
}
.btn-primary {
background-color: #007bff;
color: white;
}
.btn-secondary {
background-color: #6c757d;
color: white;
}
.btn-danger {
background-color: #dc3545;
color: white;
}
button:disabled {
background-color: #ccc;
cursor: not-allowed;
}
.status {
padding: 10px;
border-radius: 4px;
margin-bottom: 10px;
font-weight: bold;
}
.status.connected {
background-color: #d4edda;
color: #155724;
border: 1px solid #c3e6cb;
}
.status.disconnected {
background-color: #f8d7da;
color: #721c24;
border: 1px solid #f5c6cb;
}
.status.connecting {
background-color: #fff3cd;
color: #856404;
border: 1px solid #ffeaa7;
}
.messages {
height: 400px;
overflow-y: auto;
border: 1px solid #ddd;
padding: 10px;
background-color: #f8f9fa;
font-family: monospace;
font-size: 12px;
}
.message {
margin-bottom: 5px;
padding: 5px;
border-radius: 3px;
}
.message.data {
background-color: #e3f2fd;
}
.message.error {
background-color: #ffebee;
color: #c62828;
}
.message.system {
background-color: #f3e5f5;
color: #7b1fa2;
}
.timestamp {
color: #666;
font-size: 11px;
}
.stats {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
gap: 10px;
margin-top: 10px;
}
.stat-item {
background-color: #f8f9fa;
padding: 10px;
border-radius: 4px;
text-align: center;
}
.stat-value {
font-size: 24px;
font-weight: bold;
color: #007bff;
}
.stat-label {
font-size: 12px;
color: #666;
text-transform: uppercase;
}
.url-input {
width: 100%;
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
margin-bottom: 10px;
}
.message-form {
display: flex;
gap: 10px;
margin-bottom: 10px;
}
.message-input {
flex: 1;
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
}
</style>
</head>
<body>
<h1>Server-Sent Events (SSE) Client Example</h1>
<div class="container">
<h2>Connection Control</h2>
<input type="text" id="urlInput" class="url-input" value="http://localhost:8000/events"
placeholder="Enter SSE endpoint URL">
<div class="controls">
<button id="connectBtn" class="btn-primary" onclick="connect()">Connect</button>
<button id="disconnectBtn" class="btn-danger" onclick="disconnect()" disabled>Disconnect</button>
<button id="clearBtn" class="btn-secondary" onclick="clearMessages()">Clear Messages</button>
</div>
<div id="status" class="status disconnected">Disconnected</div>
<div class="stats">
<div class="stat-item">
<div id="messageCount" class="stat-value">0</div>
<div class="stat-label">Messages</div>
</div>
<div class="stat-item">
<div id="errorCount" class="stat-value">0</div>
<div class="stat-label">Errors</div>
</div>
<div class="stat-item">
<div id="connectionTime" class="stat-value">0s</div>
<div class="stat-label">Connected Time</div>
</div>
</div>
</div>
<div class="container">
<h2>Send Message (for broadcasting examples)</h2>
<div class="message-form">
<input type="text" id="messageInput" class="message-input"
placeholder="Enter message to broadcast" value="Hello from HTML client!">
<button id="sendBtn" class="btn-primary" onclick="sendMessage()">Send Message</button>
</div>
</div>
<div class="container">
<h2>Messages</h2>
<div id="messages" class="messages"></div>
</div>
<script>
let eventSource = null;
let messageCount = 0;
let errorCount = 0;
let connectionStartTime = null;
let connectionTimer = null;
// UI Elements
const statusEl = document.getElementById('status');
const messagesEl = document.getElementById('messages');
const connectBtn = document.getElementById('connectBtn');
const disconnectBtn = document.getElementById('disconnectBtn');
const urlInput = document.getElementById('urlInput');
const messageCountEl = document.getElementById('messageCount');
const errorCountEl = document.getElementById('errorCount');
const connectionTimeEl = document.getElementById('connectionTime');
const messageInput = document.getElementById('messageInput');
function updateStatus(status, message) {
statusEl.className = `status ${status}`;
statusEl.textContent = message;
}
function addMessage(content, type = 'data') {
const messageEl = document.createElement('div');
messageEl.className = `message ${type}`;
const timestamp = new Date().toLocaleTimeString();
messageEl.innerHTML = `
<span class="timestamp">${timestamp}</span> - ${content}
`;
messagesEl.appendChild(messageEl);
messagesEl.scrollTop = messagesEl.scrollHeight;
if (type === 'error') {
errorCount++;
errorCountEl.textContent = errorCount;
} else if (type === 'data') {
messageCount++;
messageCountEl.textContent = messageCount;
}
}
function updateConnectionTime() {
if (connectionStartTime) {
const elapsed = Math.floor((Date.now() - connectionStartTime) / 1000);
connectionTimeEl.textContent = `${elapsed}s`;
}
}
function connect() {
const url = urlInput.value.trim();
if (!url) {
alert('Please enter a valid URL');
return;
}
if (eventSource) {
disconnect();
}
updateStatus('connecting', 'Connecting...');
connectBtn.disabled = true;
try {
eventSource = new EventSource(url);
connectionStartTime = Date.now();
connectionTimer = setInterval(updateConnectionTime, 1000);
eventSource.onopen = function(event) {
updateStatus('connected', `Connected to ${url}`);
connectBtn.disabled = true;
disconnectBtn.disabled = false;
addMessage('Connection established', 'system');
};
eventSource.onmessage = function(event) {
let data = event.data;
// Try to parse JSON for better display
try {
const parsed = JSON.parse(data);
data = JSON.stringify(parsed, null, 2);
} catch (e) {
// Not JSON, display as-is
}
addMessage(`Data: ${data}`, 'data');
};
eventSource.onerror = function(event) {
console.error('SSE Error:', event);
addMessage('Connection error occurred', 'error');
if (eventSource.readyState === EventSource.CLOSED) {
updateStatus('disconnected', 'Connection closed');
connectBtn.disabled = false;
disconnectBtn.disabled = true;
clearInterval(connectionTimer);
connectionStartTime = null;
}
};
// Listen for custom events
['error', 'alert', 'system', 'task', 'custom', 'success', 'recovery', 'fatal_error', 'multiline'].forEach(eventType => {
eventSource.addEventListener(eventType, function(event) {
addMessage(`[${eventType.toUpperCase()}] ${event.data}`, eventType === 'error' || eventType === 'fatal_error' ? 'error' : 'system');
});
});
} catch (error) {
updateStatus('disconnected', 'Connection failed');
connectBtn.disabled = false;
addMessage(`Connection failed: ${error.message}`, 'error');
}
}
function disconnect() {
if (eventSource) {
eventSource.close();
eventSource = null;
}
updateStatus('disconnected', 'Disconnected');
connectBtn.disabled = false;
disconnectBtn.disabled = true;
clearInterval(connectionTimer);
connectionStartTime = null;
addMessage('Connection closed', 'system');
}
function clearMessages() {
messagesEl.innerHTML = '';
messageCount = 0;
errorCount = 0;
messageCountEl.textContent = '0';
errorCountEl.textContent = '0';
}
async function sendMessage() {
const message = messageInput.value.trim();
if (!message) {
alert('Please enter a message');
return;
}
try {
const response = await fetch('http://localhost:8000/send', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
message: message,
event: 'broadcast'
})
});
if (response.ok) {
const result = await response.json();
addMessage(`Message sent successfully to ${result.clients} clients`, 'system');
messageInput.value = '';
} else {
addMessage(`Failed to send message: ${response.statusText}`, 'error');
}
} catch (error) {
addMessage(`Error sending message: ${error.message}`, 'error');
}
}
// Allow Enter key to send messages
messageInput.addEventListener('keypress', function(e) {
if (e.key === 'Enter') {
sendMessage();
}
});
// Allow Enter key to connect
urlInput.addEventListener('keypress', function(e) {
if (e.key === 'Enter' && !connectBtn.disabled) {
connect();
}
});
// Initialize
addMessage('SSE Client ready. Enter a URL and click Connect to start.', 'system');
</script>
</body>
</html>
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