https://redziaevents.com/js/lazy_load_events.1788259773.js

1jQuery(function ($) {
2	const PAGE_SIZE = 25;
3	const $events = $('.lazy-load-item');
4	const $sentinel = $('#lazy-load-sentinel');
5	const $loader = $('#lazy-loader');
6
7	let observer;
8
9	const revealNextBatch = () => {
10		const $next = $events.filter('.hidden').slice(0, PAGE_SIZE);
11		$next.removeClass('hidden');
12
13		// nothing left - disconnect sentinel
14		if ($events.filter('.hidden').length === 0) {
15			if (observer) {
16				observer.disconnect();
17			}
18			$sentinel.hide();
19		}
20	};
21
22	// initial load
23	revealNextBatch();
24
25	// Prefetch when the sentinel is within 100 px of the viewport bottom.
26	observer = new IntersectionObserver(
27		(entries) => {
28			entries.forEach((entry) => {
29				if (entry.isIntersecting) {
30					$loader.show();
31					revealNextBatch();
32					$loader.hide();
33				}
34			});
35		},
36		{ root: null, rootMargin: '0px 0px 100px 0px', threshold: 0 }
37	);
38
39	// Fallback for old browsers that lack IntersectionObserver
40	if ('IntersectionObserver' in window) {
41		observer.observe($sentinel[0]);
42	} else {
43		$(window).on('scroll.lazyload', function () {
44			const scrollBottom = $(window).scrollTop() + $(window).height();
45			const sentinelTop  = $sentinel.offset().top;
46			if (scrollBottom + 400 >= sentinelTop) {
47				revealNextBatch();
48			}
49		});
50	}
51});