Exemplo-Socket/example_1.html at master · brunodemarchi/Exemplo-Socket · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<canvas id="canvarino" width="800" height="300" style="border:1px solid #d3d3d3;">
    Your browser does not support the HTML5 canvas tag.
</canvas>

<h1>Status: <p style="display: inline" id="status_msg"></p></h1>
<script>
    const c = document.getElementById("canvarino");
    const ctx = c.getContext("2d");
    const offset = 50

    function drawCircle(ctx, x, y, color) {
        ctx.beginPath();
        ctx.arc(x, y, 20, 0, 2 * Math.PI);
        ctx.fillStyle = color
        ctx.fill();
    }

    function clearCanvas(ctx) {
        ctx.clearRect(0, 0, 800, 300)
    }

    function drawCircles(arr) {
        clearCanvas(ctx)
        arr.forEach(circle => {
            drawCircle(ctx, circle.pos_x, circle.pos_y, circle.color)
        })
    }

</script>

<script>
    const status_msg = document.getElementById("status_msg");
    const retry_cooldown = 5000

    function connect() {
        const socket = new WebSocket('ws://localhost:4000/socket/websocket/')
        status_msg.innerText = "tentando conectar...";
        socket.onopen = () => {
            socket.send(
                JSON.stringify({
                    "topic": "order_map_coords:lobby",
                    "event": "phx_join",
                    "payload": {},
                    "ref": "ref"
                })
            )
        }

        socket.onmessage = (event) => {
            const msg = JSON.parse(event.data)
            const payload = msg.payload.data
            if (payload) {
                status_msg.innerText = `recebido um pacote com ${payload.length} pedidos, atualizando o mapa.`
                drawCircles(payload)
            } else {
                status_msg.innerText = "conectado com o socket, esperando updates";
            }
        }

        socket.onclose = (ev) => {
            status_msg.innerText = "conexão caiu, tentando se reconectar. Err code: " + ev.code;
            setTimeout(function() {
                connect();
            }, retry_cooldown);
        }
    }

    connect()


</script>
</body>
</html>