trimill.xyz/flaskr/templates/projects/number/index.html

{% set meta={"title": "Number", "desc": "make go up"} %}
{% extends "/_base.html"%}
{% block head%}
<script>
    const url = "wss://api.trimill.xyz/number";
    let ws = undefined;

    window.onload = () => {
        try {
            ws = new WebSocket(url);
            ws.addEventListener("message", msg => {
                document.getElementById("error").textContent = "";
                document.getElementById("number").textContent = msg.data;
                console.log(msg);
            });
        } catch(e) {
            document.getElementById("error").textContent = "Error connecting to server: " + e.toString();
        }
    }

    function makegoup() {
        try {
            ws.send("inc");
        } catch(e) {
            document.getElementById("error").textContent = "Error connecting to server: " + e.toString();
        }
    }
</script>
{% endblock %}
{% block content%}
<div id="number">?</div>
<div>
    <input type="button" value="Make go up" id="button" onclick="makegoup();" />
</div>
<div class="error" id="error"></div>
{% endblock %}