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<!DOCTYPE html>
<html>
<head>
<title>WebSocket demo</title>
<style type="text/css">
body {
font-family: "Courier New", sans-serif;
text-align: center;
}
.buttons {
font-size: 4em;
display: flex;
justify-content: center;
}
.button, .value {
line-height: 1;
padding: 2rem;
margin: 2rem;
border: medium solid;
min-height: 1em;
min-width: 1em;
}
.button {
cursor: pointer;
user-select: none;
}
.minus {
color: red;
}
.plus {
color: green;
}
.value {
min-width: 2em;
}
.state {
font-size: 2em;
}
</style>
</head>
<body>
<div class="buttons">
<div class="minus button">-</div>
<div class="value">?</div>
<div class="plus button">+</div>
</div>
<div class="state">
<span class="users">?</span> online
</div>
<script>
var minus = document.querySelector('.minus'),
plus = document.querySelector('.plus'),
value = document.querySelector('.value'),
users = document.querySelector('.users'),
websocket = new WebSocket("ws://127.0.0.1:6789/");
minus.onclick = function (event) {
websocket.send(JSON.stringify({action: 'minus'}));
}
plus.onclick = function (event) {
websocket.send(JSON.stringify({action: 'plus'}));
}
websocket.onmessage = function (event) {
data = JSON.parse(event.data);
switch (data.type) {
case 'state':
value.textContent = data.value;
break;
case 'users':
users.textContent = (
data.count.toString() + " user" +
(data.count == 1 ? "" : "s"));
break;
default:
console.error(
"unsupported event", data);
}
};
</script>
</body>
</html>
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