coffee-queue/index.html at master · SchramlTim/coffee-queue · GitHub

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<html>

<head>
    <style>
        .centered {
            position: fixed;
            top: 50%;
            left: 50%;
            /* bring your own prefixes */
            transform: translate(-50%, -50%);
            text-align: center;
        }

        .countstyle {
            font-size: 17.5rem;
        }

        .textstyle {
            font-size: 8rem;
        }
    </style>
    <script>
        setInterval(function() {
            var xmlhttp = new XMLHttpRequest();
            xmlhttp.onreadystatechange = function() {
                if (xmlhttp.readyState == XMLHttpRequest.DONE) {
                    if (xmlhttp.status == 200) {
                        document.getElementById("count").innerHTML = xmlhttp.responseText.replace('"', '').replace('"', '');
                    } else if (xmlhttp.status == 400) {
                        alert('There was an error 400');
                    } else {
                        alert('something else other than 200 was returned');
                    }
                }
            };

            xmlhttp.open("GET", "/count", true);
            xmlhttp.send();
        }, 1000);
    </script>

</head>

<body>
    <div class="centered">
        <span class="countstyle" id="count"></span><br/>
        <span class="textstyle">person on coffee machine</span>
    </div>
</body>

</html>