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traffic.html
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traffic.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Traffic light</title>
</head>
<body>
<nav>
<a href="counter.html">Counter</a> | <a href="input.html">Input</a> |
<a href="traffic.html">Traffic Light</a>
</nav>
<h1>Traffic light</h1>
<div class="traffic">
<div id="red" class="light">Red</div>
<div id="yellow" class="light">Yellow</div>
<div id="green" class="light">Green</div>
</div>
</body>
<style>
body {
display: flex;
flex-direction: column;
align-items: center;
font-family: 'Roboto', sans-serif;
}
.traffic {
padding: 20px;
border: solid 10px darkgray;
border-radius: 80px;
background-color: black;
display: grid;
gap: 10px;
}
.light {
width: 100px;
height: 100px;
display: grid;
place-items: center;
border-radius: 50%;
background: white;
}
.red {
background: red;
}
.yellow {
background: yellow;
}
.green {
background: green;
}
</style>
<script>
const red = document.getElementById('red');
red.addEventListener('click', () => toggleColor(event.target, 'red'));
const yellow = document.getElementById('yellow');
yellow.addEventListener('click', () => toggleColor(event.target, 'yellow'));
const green = document.getElementById('green');
green.addEventListener('click', () => toggleColor(event.target, 'green'));
function toggleColor(div, color) {
if (div.classList.contains(color)) return div.classList.remove(color);
div.classList.add(color);
}
</script>
</html>