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index.html
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<!DOCTYPE html>
<html>
<body>
<h1>Chat</h1>
<div id="chat"></div>
<input id="msg" type="text">
<style>
input { border: 1px solid green; }
</style>
<script>
const CHAR_RETURN = 13;
const socket = new WebSocket('ws://127.0.0.1:8000/chat');
const chat = document.getElementById('chat');
const msg = document.getElementById('msg');
msg.focus();
const writeLine = (text) => {
const line = document.createElement('div');
line.innerHTML = `<p>${text}</p>`;
chat.appendChild(line);
};
socket.addEventListener('open', () => {
writeLine('connected');
});
socket.addEventListener('close', () => {
writeLine('closed');
});
socket.addEventListener('message', ({ data }) => {
writeLine(data);
});
msg.addEventListener('keydown', (event) => {
if (event.keyCode === CHAR_RETURN) {
const s = msg.value;
msg.value = '';
writeLine(s);
socket.send(s);
}
});
</script>
</body>
</html>