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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Socket.IO Chat</title>
<style>
/* General styles */
body {
margin: 0;
padding-bottom: 3rem;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
background-color: #f5f5f5;
color: #333;
}
/* Messages list styling */
#messages {
list-style-type: none;
margin: 0;
padding: 1rem;
max-height: calc(100vh - 5rem);
overflow-y: auto;
box-sizing: border-box;
}
#messages > li {
padding: 0.5rem 1rem;
margin-bottom: 0.5rem;
border-radius: 8px;
background: #ffffff;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
#messages > li:nth-child(odd) {
background: #f0f0f0;
}
/* Input form styling */
#form {
background: rgba(255, 255, 255, 0.9);
padding: 0.5rem;
position: fixed;
bottom: 0;
left: 0;
right: 0;
display: flex;
height: 3.5rem;
align-items: center;
box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
backdrop-filter: blur(10px);
}
#input {
flex-grow: 1;
padding: 0.75rem 1rem;
margin-right: 0.5rem;
border: 1px solid #ddd;
border-radius: 20px;
font-size: 1rem;
box-sizing: border-box;
}
#input:focus {
outline: none;
border-color: #007bff;
box-shadow: 0 0 4px rgba(0, 123, 255, 0.25);
}
#form > button {
padding: 0.75rem 1.5rem;
background: #007bff;
color: #fff;
border: none;
border-radius: 20px;
font-size: 1rem;
cursor: pointer;
transition: background-color 0.3s ease;
}
#form > button:hover {
background: #0056b3;
}
</style>
</head>
<body>
<ul id="messages"></ul>
<form id="form" action="">
<input id="input" autocomplete="off" placeholder="Type a message..." />
<button type="submit">Send</button>
</form>
<script src="/socket.io/socket.io.js"></script>
<script>
let counter = 0;
const socket = io({
auth: {
serverOffset: 0
},
ackTimeout: 10000,
retries: 3,
});
const form = document.getElementById('form');
const input = document.getElementById('input');
const messages = document.getElementById('messages');
form.addEventListener('submit', (e) => {
e.preventDefault();
if (input.value) {
const clientOffset = `${socket.id}-${counter++}`;
socket.emit('chat message', input.value, clientOffset);
input.value = '';
}
});
socket.on('chat message', (msg, serverOffset) => {
const item = document.createElement('li');
item.textContent = msg;
messages.appendChild(item);
window.scrollTo(0, document.body.scrollHeight);
socket.auth.serverOffset = serverOffset;
});
</script>
</body>
</html>