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chat.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebSocket Chat</title>
</head>
<body>
<h1>WebSocket Chat Example</h1>
<input id="username" style="display:block; width:100px; box-sizing: border-box" type="text" placeholder="username">
<button id="join-chat" type="button">Join Chat</button>
<textarea id="chat" style="display:block; width:600px; height:400px; box-sizing: border-box" cols="30"
rows="10"></textarea>
<input id="input" style="display:block; width:600px; box-sizing: border-box" type="text" placeholder="chat">
<script>
const username = document.querySelector("#username");
const join_btn = document.querySelector("#join-chat");
const textarea = document.querySelector("#chat");
const input = document.querySelector("#input");
join_btn.addEventListener("click", function (e) {
this.disabled = true;
const websocket = new WebSocket("ws://localhost:3001/ws");
websocket.onopen = function () {
console.log("connection opened");
websocket.send(username.value);
}
const btn = this;
websocket.onclose = function () {
console.log("connection closed");
btn.disabled = false;
}
websocket.onmessage = function (e) {
console.log("received message: " + e.data);
textarea.value += e.data + "\r\n";
}
input.onkeydown = function (e) {
if (e.key == "Enter") {
websocket.send(input.value);
input.value = "";
}
}
});
</script>
</body>
</html>