jQuery Set Attribute Callback Example

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<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>jQuery attr() Example – Update Attributes Using Callback</title>
		<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
		<style>
			body {
				font-family: sans-serif;
				padding: 30px;
				background: #f9f9f9;
			}

.highlight {
				color: white;
				background: teal;
				padding: 10px;
			}

button {
				padding: 8px 15px;
				margin-top: 20px;
				background: #007bff;
				color: white;
				border: none;
				cursor: pointer;
				border-radius: 4px;
			}

table {
				margin-top: 30px;
				border-collapse: collapse;
				width: 100%;
				max-width: 600px;
				background: #fff;
				border: 1px solid #ccc;
			}

th, td {
				padding: 10px;
				border: 1px solid #ccc;
				text-align: left;
			}

th {
				background-color: #f1f1f1;
			}
		</style>
	</head>
	<body>

<h2 id="mainTitle" class="heading">Original Heading</h2>

<button id="setAttrBtn">Update ID and Class</button>

<table>
			<tr>
				<th>Attribute</th>
				<th>Old Value</th>
				<th>New Value</th>
			</tr>
			<tr>
				<td>ID</td>
				<td id="oldId"></td>
				<td id="newId"></td>
			</tr>
			<tr>
				<td>Class</td>
				<td id="oldClass"></td>
				<td id="newClass"></td>
			</tr>
		</table>

// Display initial values
				$('#oldId').text($title.attr('id'));
				$('#oldClass').text($title.attr('class'));

$('#setAttrBtn').click(function(){
					// Update attributes using callback
					$title.attr('id', function(i, val){
						return val + '_updated';
					});

$title.attr('class', function(i, val){
						return val + ' highlight';
					});

// Update table values
					$('#newId').text($title.attr('id'));
					$('#newClass').text($title.attr('class'));
				});
			});
		</script>

</body>
</html>

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