jQuery Animate Callback Promise Example

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<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<title>jQuery Callbacks & Promises</title>
		<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
		<style>
			body {
				font-family: Arial, sans-serif;
				background: #f3f6fa;
				padding: 40px;
				text-align: center;
			}

h2 {
				color: #34495e;
				margin-bottom: 10px;
			}

p.description {
				color: #555;
				max-width: 600px;
				margin: 0 auto 30px;
				font-size: 15px;
			}

.container {
				display: flex;
				justify-content: center;
				gap: 20px;
				margin-bottom: 30px;
			}

.item {
				width: 80px;
				height: 80px;
				background: red;
				border: 2px solid #ccc;
				border-radius: 4px;
				line-height: 80px;
				font-weight: bold;
				color: #fff;
				cursor: pointer;
				transition: box-shadow 0.3s ease;
			}

.item:hover {
				box-shadow: 0 4px 12px rgba(0,0,0,0.2);
			}

#summary {
				display: none;
				font-size: 18px;
				color: #27ae60;
				margin-top: 20px;
			}

#startBtn {
				padding: 10px 20px;
				font-size: 15px;
				background: #2c3e50;
				color: white;
				border: none;
				border-radius: 4px;
				cursor: pointer;
				margin-top: 20px;
			}

#startBtn:hover {
				background: #3e5871;
			}
		</style>
	</head>
	<body>

<h2>jQuery Callbacks & Promises</h2>
		<p class="description">
			This example uses <code>animate()</code> with delays and <code>promise()</code> to highlight items sequentially and show a summary when done.
		</p>

<button id="startBtn">Start Sequence</button>

<div id="summary">All highlights completed!</div>

$('.item').each(function(index) {
						$(this)
							.delay(300 * index)
							.animate({ opacity: 0.2 }, 300)
							.animate({ borderRadius: '50px' }, 300)
							.animate({ borderRadius: '0px' }, 300)
							.animate({ opacity: 1 }, 300);
					});

$('.item').promise().done(function() {
						$('#summary').fadeIn(500);
					});
				});
			});
		</script>

</body>
</html>

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