https://www.jhrl.com/sites/all/modules/bluetent/bt_optimize/js/bto.jquery.js?tlse4v

1(function($) {
2    var detectIE = function () {
3        var ua = window.navigator.userAgent;
4
5        var msie = ua.indexOf('MSIE ');
6        if (msie > 0) {
7            // IE 10 or older => return version number
8            return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
9        }
10
11        var trident = ua.indexOf('Trident/');
12        if (trident > 0) {
13            // IE 11 => return version number
14            var rv = ua.indexOf('rv:');
15            return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
16        }
17
18        var edge = ua.indexOf('Edge/');
19        if (edge > 0) {
20            // Edge (IE 12+) => return version number
21            return parseInt(ua.substring(edge + 5, ua.indexOf('.', edge)), 10);
22        }
23
24        // other browser
25        return false;
26    }
27    var beforeDoc = true;
28    var LazyLoadImgIO = (typeof IntersectionObserver == 'undefined' || detectIE()) ? undefined : new IntersectionObserver(function(entries) {
29        for(ind in entries) {
30            if(entries[ind].isIntersecting) {
31                swapOut(entries[ind].target)
32                LazyLoadImgIO.unobserve(entries[ind].target)
33            }
34        }
35    }, {rootMargin: "80px 0px 80px 0px"});
36    var LazyLoadJumpIO = (typeof IntersectionObserver == 'undefined' || detectIE()) ? undefined : new IntersectionObserver(function(entries) {
37        for(ind in entries) {
38            if(entries[ind].isIntersecting) {
39                lazyJump(entries[ind].target)
40                LazyLoadJumpIO.unobserve(entries[ind].target)
41            }
42        }
43    }, {rootMargin: "80px 0px 80px 0px"});
44    var swapOut = function(elem) {
45      var $elem = $(elem),
46        srcset;
47      if (beforeDoc) {
48        setSrc($elem);
49      } else {
50        srcset = $elem.attr('data-srcset');
51        if (srcset) {
52          srcset = 'srcset="' + srcset + '" ';
53        }
54
55        $('<img src="' + $elem.attr('data-src') + '" ' + srcset + '/>').on('load', function() {
56          setSrc($elem);
57        });
58      }
59    }
60    function setSrc($elem) {
61      var src = $elem.attr('data-src'),
62        srcset = $elem.attr('data-srcset');
63      $elem.attr('src', src);
64      $elem.addClass('bto-lazy-loaded');
65      if (srcset) {
66        $elem.attr('srcset', srcset);
67      }
68    }
69    var lazyLoad = function(context) {
70        $('img[data-src].bto-lazy', context).once('btoLazyLoad', function() {
71            if(typeof LazyLoadImgIO != 'undefined') {
72                LazyLoadImgIO.observe(this)
73            } else {
74                swapOut(this)
75            }
76        })
77        $('div.bto-lazy-jump', context).once('btoLazyLoad', function() {
78            if(typeof LazyLoadJumpIO != 'undefined') {
79                LazyLoadJumpIO.observe(this)
80            } else {
81                lazyJump(this)
82            }
83        })
84    }
85    var lazyJump = function(elem) {
86        $.get($(elem).attr('data-bto-jump-select'), function(data) {
87            var sel = $(data)
88                $(sel).addClass('bto-lazy-loaded')
89            $(elem).replaceWith(sel)
90           Drupal.attachBehaviors(sel, Drupal.settings)
91        });
92    }
93    Drupal.behaviors.btoLazyLoad = {
94        attach: function(context) {
95            lazyLoad(context)
96        }
97    }
98    lazyLoad(document)
99    $(document).ready(function() {
100        beforeDoc = false
101    })
102})(jQuery)