Add sortable, striped table script — only when needed

Ever wondered how I dressed up the tables on this site? I’ll show you! We’ll use the code for adding stylesheets and scripts conditionally to include Yoast’s improved sortable.js only when a post or page contains a table.

// enqueue sortable.js on pages containing tables
function add_sortable ($posts) {
	if (empty($posts)) return $posts;
	$found = false;
	foreach ($posts as $post) {
		if (stripos($post->post_content, '<table')) {
			$found = true;
			break;
		}
	}
	if ($found) {
		wp_enqueue_script('sortable', get_bloginfo('template_url').'/js/sortable.js');
	}
	return $posts;
}
add_filter('the_posts', 'add_sortable');

Add this to your functions.php file. Then add class="sortable" and a unique ID to your tables and view your post or page. If it worked, your table headings should be clickable, and your table rows should be alternating colors (assuming your stylesheet includes .odd and/or .even classes).