jQuery Traversing Filtering AddBack Example

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<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
		<title>jQuery Traversal – addBack() Demo</title>
		<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
		<style>
			body {
				font-family: Arial, sans-serif;
				background: #f9f9f9;
				padding: 30px;
			}
			h2 {
				color: #2c3e50;
				margin-bottom: 10px;
			}
			.btn {
				padding: 10px 20px;
				margin-right: 10px;
				margin-bottom: 20px;
				font-size: 14px;
				color: #fff;
				border: none;
				border-radius: 4px;
				cursor: pointer;
			}
			.btn-items {
				background: #3498db;
			}
			.btn-items:hover {
				background: #2980b9;
			}
			.btn-items-box {
				background: #27ae60;
			}
			.btn-items-box:hover {
				background: #1e8449;
			}
			.box {
				background: #fff;
				border: 2px solid #bdc3c7;
				border-radius: 6px;
				padding: 15px;
				width: 300px;
			}
			ul {
				padding-left: 20px;
			}
			li {
				margin: 5px 0;
			}
			.bold {
				font-weight: bold;
				color: #333;
			}
			.highlight-box {
				border-color: #f39c12 !important;
				background: #f39c1222;
			}
		</style>
	</head>
	<body>

<h2>jQuery Traversal – addBack() Method</h2>
		<p>Compare how <code>addBack()</code> lets you affect both list items <em>and</em> their container.</p>

<button class="btn btn-items" id="boldItems">Bold Items</button>
		<button class="btn btn-items-box" id="boldItemsBox">Bold Items & Highlight Box</button>

<div class="box">
			<h3>Grocery List</h3>
			<ul>
				<li>Apples</li>
				<li>Bread</li>
				<li>Carrots</li>
				<li>Detergent</li>
			</ul>
		</div>

$('#boldItems').on('click', function() {
					reset();
					// only list items become bold
					$('.box').find('li').addClass('bold');
				});

$('#boldItemsBox').on('click', function() {
					reset();
					// Bold items, then addBack() brings the .box into the set and highlights it
					$('.box')
						.find('li').addClass('bold')
						.addBack().addClass('highlight-box');
				});
			});
		</script>

</body>
</html>

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