https://www.belmontmarket.com/wp-content/themes/belmont_19/_scripts/eephus_loader.js?ver=1.1.51

1/************************************/
2/* EEPHUS LAZY LOADER               */ 
3/* FOR BACKGROUND IMAGES            */
4/*                                  */
5/* DW GREEN - OCT. 2019             */
6/************************************/
7
8var lazyload = function(){};
9
10if(typeof lazyloadImages == "undefined");
11	var lazyloadImages = jQuery();
12
13
14$(document).ready(function() {
15
16	/* LAZY LOADING IMAGES */
17	var sizeSrc;
18	var sizeSrcAlt;
19	
20	if (sizeState == 'mobile') {
21		sizeSrc = 'data-src-m';	
22		sizeSrcAlt = 'data-src-d';
23	} else {
24		sizeSrc = 'data-src-d';	
25		sizeSrcAlt = 'data-src-m';
26	}
27	lazyloadImages = $.merge(lazyloadImages,$('['+ sizeSrc +'], ['+ sizeSrcAlt +']'));
28	console.log(lazyloadImages);
29	var lazyloadThrottleTimeout;
30
31	if ("IntersectionObserver" in window) {			
32		var imageObserver = new IntersectionObserver(function(entries, observer) {
33			entries.forEach(function(entry) {
34				if (entry.isIntersecting) {
35					var $img = $(entry.target);
36					log($img,'target');
37					var src = $img.attr(sizeSrc);
38					if (!src) {
39						src = $img.attr(sizeSrcAlt);	
40					}
41					$img.css('background-image',"url("+src+")");
42				}
43			});
44		});
45		lazyloadImages.each(function(i,img){
46			imageObserver.observe(img);
47		});
48		
49	} else {
50		lazyload = function() {
51			if (lazyloadThrottleTimeout)
52				clearTimeout(lazyloadThrottleTimeout);
53			
54			lazyloadThrottleTimeout = setTimeout(function(){
55				var scrollTop = window.pageYOffset;
56				lazyloadImages.each(function(i,img){
57					var $img = $(img);
58					log('ll',$img,img.offsetTop,(window.innerHeight + scrollTop));
59					if(img.offsetTop < (window.innerHeight + scrollTop)) {
60						var src = $img.attr(sizeSrc);
61						if (!src) {
62							src = $img.attr(sizeSrcAlt);	
63						}
64						$img.css('background-image',"url('"+src+"')");
65					}
66				});
67				if (lazyloadImages.length == 0) {
68					document.removeEventListener("scroll", lazyload);
69					window.removeEventListener("resize", lazyload);
70					window.removeEventListener("orientationChange", lazyload);
71				}
72			}, 20);
73		}
74
75		document.addEventListener("scroll", lazyload);
76		window.addEventListener("resize", lazyload);
77		window.addEventListener("orientationChange", lazyload);
78		lazyload();
79	}	
80});
81