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index.html
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<title>Socket.IO chat</title>
<style>
body { margin: 0; padding-bottom: 3rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
#form { background: rgba(0, 0, 0, 0.15); padding: 0.25rem; position: fixed; bottom: 0; left: 0; right: 0; display: flex; height: 3rem; box-sizing: border-box; backdrop-filter: blur(10px); }
#input { border: none; padding: 0 1rem; flex-grow: 1; border-radius: 2rem; margin: 0.25rem; }
#input:focus { outline: none; }
#form > button { background: #333; border: none; padding: 0 1rem; margin: 0.25rem; border-radius: 3px; outline: none; color: #fff; }
#messages { list-style-type: none; margin: 0; padding: 0}
#messages > li { padding: 0.5rem 1rem; }
#messages > li:nth-child(odd) { background: #efefef; }
</style>
</head>
<body>
<ul id="messages"></ul>
<form id="form" action="">
<input id="input" autocomplete="off" />
<button>Send</button>
<button id="connection-button">Disconnect</button>
</form>
<script src="/socket.io/socket.io.js"></script>
<script>
let counter;
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')
const connection_button = document.getElementById('connection-button')
connection_button.addEventListener('click', (e) => {
e.preventDefault();
let msg;
// // console.log(connection_button.innerText);
// if(socket.connected){
// connection_button.innerText = "Connect"
// socket.disconnect();
// msg = "someone disconnected"
// }
// else{
// connection_button.innerText = "Disconnect"
// socket.connect();
// msg = 'someone connected'
// }
// console.log(connection_button.innerText);
if(socket.connected){
connection_button.innerText = "Connect"
msg = "someone disconnected"
socket.emit('chat message', msg, 0)
socket.disconnect();
}
else{
connection_button.innerText = "Disconnect"
msg = 'someone connected'
socket.emit('chat message', msg, 1)
socket.connect();
}
})
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
})
// socket.on('connection message', (msg, flag, serverOffset) => {
// const item = document.createElement('li')
// if(flag === 0){
// item.style.backgroundColor = '#FF5733'
// flag = 1;
// }
// else{
// item.style.backgroundColor = '#DAF7A6'
// flag = 0;
// }
// item.textContent = msg;
// messages.appendChild(item)
// window.scrollTo(0, document.body.scrollHeight)
// socket.auth.serverOffset = serverOffset
// })
</script>
</body>
</html>