<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Erlang WebSocket</title>
</head>
<body>
<header>
<h1>Erlang WebSocket</h1>
<div id="status"></div>
</header>
<nav>
<div id="connecting">
<input type='text' id="server" value=""></input>
<button type="button" onclick="toggle_connection()">Conectar</button>
</div>
<div id="connected">
<input type='text' id="message" value=""></input>
<button type="button" onclick="sendTxt();">Enviar</button>
</div>
</nav>
<main id="content">
<button id="clear" onclick="clearScreen()">Limpar</button>
<div id="output"></div>
</main>
<script type="text/javascript">
let websocket;
let server = document.getElementById("server");
let message = document.getElementById("message");
let connecting = document.getElementById("connecting");
let connected = document.getElementById("connected");
let content = document.getElementById("content");
let output = document.getElementById("output");
server.value = "ws://" + window.location.host + "/websocket";
connected.style.display = "none";
content.style.display = "none";
function connect() {
wsHost = server.value;
websocket = new WebSocket(wsHost);
showScreen('<b>Connecting to: ' + wsHost + '</b>');
websocket.onopen = function (evt) { onOpen(evt) };
websocket.onclose = function (evt) { onClose(evt) };
websocket.onmessage = function (evt) { onMessage(evt) };
websocket.onerror = function (evt) { onError(evt) };
};
function disconnect() {
websocket.close();
};
function toggle_connection() {
if (websocket && websocket.readyState == websocket.OPEN) {
disconnect();
} else {
connect();
};
};
function sendTxt() {
if (websocket.readyState == websocket.OPEN) {
var msg = message.value;
websocket.send(msg);
showScreen('<span><b>CLIENT</b>: ' + msg + '</span>');
} else {
showScreen('websocket is not connected');
};
};
function onOpen(evt) {
showScreen('<span><b>SERVER</b>: Conectado</span>');
connecting.style.display = "none";
connected.style.display = "";
content.style.display = "";
};
function onClose(evt) {
showScreen('<span><b>SERVER</b>: Desconectado</span>');
};
function onMessage(evt) {
showScreen('<span><b>SERVER</b>: ' + evt.data + '</span>');
};
function onError(evt) {
showScreen('<span style="color: red;">ERROR: ' + evt.data + '</span>');
};
function showScreen(html) {
var el = document.createElement("p");
el.innerHTML = html;
output.insertBefore(el, output.firstChild);
};
function clearScreen() {
output.innerHTML = "";
};
</script>
</body>
</html>