https://www.ret.nl/assets/javascript/vendor/lazyload.min.js?1788853062

1/*! lazyload 1.5.5 by Andrea "verlok" Verlicchi*/
2!function (a, b) {
3    "function" == typeof define && define.amd ? define([], b) : "object" == typeof exports ? module.exports = b() : a.LazyLoad = b()
4}(this, function () {
5    function a(a, b, c) {
6        return m ? void a.addEventListener(b, c) : void(n && (a.attachEvent("on" + b, function (a) {
7            return function () {
8                c.call(a, window.event)
9            }
10        }(a)), a = null))
11    }
12
13    function b(a, b, c) {
14        return m ? void a.removeEventListener(b, c) : void(n && a.detachEvent("on" + b, c))
15    }
16
17    function c(a, b, c) {
18        function d() {
19            return window.innerWidth || l.documentElement.clientWidth || document.body.clientWidth
20        }
21
22        function e() {
23            return window.innerHeight || l.documentElement.clientHeight || document.body.clientHeight
24        }
25
26        function f(a) {
27            return a.getBoundingClientRect().top + m - l.documentElement.clientTop
28        }
29
30        function g(a) {
31            return a.getBoundingClientRect().left + n - l.documentElement.clientLeft
32        }
33
34        function h() {
35            var d;
36            return d = b === window ? e() + m : f(b) + b.offsetHeight, d <= f(a) - c
37        }
38
39        function i() {
40            var e;
41            return e = b === window ? d() + window.pageXOffset : g(b) + d(), e <= g(a) - c
42        }
43
44        function j() {
45            var d;
46            return d = b === window ? m : f(b), d >= f(a) + c + a.offsetHeight
47        }
48
49        function k() {
50            var d;
51            return d = b === window ? n : g(b), d >= g(a) + c + a.offsetWidth
52        }
53
54        var l, m, n;
55        return l = a.ownerDocument, m = window.pageYOffset || l.body.scrollTop, n = window.pageXOffset || l.body.scrollLeft, !(h() || j() || i() || k())
56    }
57
58    function d() {
59        var a = new Date;
60        return a.getTime()
61    }
62
63    function e(a, b) {
64        var c, d = {};
65        for (c in a)a.hasOwnProperty(c) && (d[c] = a[c]);
66        for (c in b)b.hasOwnProperty(c) && (d[c] = b[c]);
67        return d
68    }
69
70    function f(a) {
71        try {
72            return Array.prototype.slice.call(a)
73        } catch (b) {
74            var c, d = [], e = a.length;
75            for (c = 0; e > c; c++)d.push(a[c]);
76            return d
77        }
78    }
79
80    function g(a, b) {
81        return o ? void a.classList.add(b) : void(a.className += (a.className ? " " : "") + b)
82    }
83
84    function h(a, b) {
85        return o ? void a.classList.remove(b) : void(a.className = a.className.replace(new RegExp("(^|\\s+)" + b + "(\\s+|$)"), " ").replace(/^\s+/, "").replace(/\s+$/, ""))
86    }
87
88    function i(a, b, c, d) {
89        var e = b.getAttribute("data-" + c), f = b.getAttribute("data-" + d);
90        e && a.setAttribute("srcset", e), f && a.setAttribute("src", f)
91    }
92
93    function j(a, b) {
94        return function () {
95            return a.apply(b, arguments)
96        }
97    }
98
99    function k(b) {
100        this._settings = e(l, b), this._queryOriginNode = this._settings.container === window ? document : this._settings.container, this._previousLoopTime = 0, this._loopTimeout = null, this._handleScrollFn = j(this.handleScroll, this), a(window, "resize", this._handleScrollFn), this.update()
101    }
102
103    var l = {
104        elements_selector: "img",
105        container: window,
106        threshold: 300,
107        throttle: 50,
108        data_src: "original",
109        data_srcset: "original-set",
110        class_loading: "loading",
111        class_loaded: "loaded",
112        skip_invisible: !0,
113        show_while_loading: !1,
114        callback_load: null,
115        callback_set: null,
116        callback_processed: null,
117        placeholder: "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"
118    }, m = !!window.addEventListener, n = !!window.attachEvent, o = !!document.body.classList;
119    return k.prototype._showOnLoad = function (c) {
120        function d() {
121            null !== f && (f.callback_load && f.callback_load(c), i(c, c, f.data_srcset, f.data_src), f.callback_set && f.callback_set(c), h(c, f.class_loading), g(c, f.class_loaded), b(e, "load", d))
122        }
123
124        var e, f = this._settings;
125        c.getAttribute("src") || c.setAttribute("src", f.placeholder), e = document.createElement("img"), a(e, "load", d), g(c, f.class_loading), i(e, c, f.data_srcset, f.data_src)
126    }, k.prototype._showOnAppear = function (c) {
127        function d() {
128            null !== e && (e.callback_load && e.callback_load(c), h(c, e.class_loading), g(c, e.class_loaded), b(c, "load", d))
129        }
130
131        var e = this._settings;
132        a(c, "load", d), g(c, e.class_loading), i(c, c, e.data_srcset, e.data_src), e.callback_set && e.callback_set(c)
133    }, k.prototype._loopThroughElements = function () {
134        var a, b, d = this._settings, e = this._elements, f = e ? e.length : 0, g = [];
135        for (a = 0; f > a; a++)b = e[a], d.skip_invisible && null === b.offsetParent || c(b, d.container, d.threshold) && (d.show_while_loading ? this._showOnAppear(b) : this._showOnLoad(b), g.push(a), b.wasProcessed = !0);
136        for (; g.length > 0;)e.splice(g.pop(), 1), d.callback_processed && d.callback_processed(e.length);
137        0 === f && this._stopScrollHandler()
138    }, k.prototype._purgeElements = function () {
139        var a, b, c = this._elements, d = c.length, e = [];
140        for (a = 0; d > a; a++)b = c[a], b.wasProcessed && e.push(a);
141        for (; e.length > 0;)c.splice(e.pop(), 1)
142    }, k.prototype._startScrollHandler = function () {
143        this._isHandlingScroll || (this._isHandlingScroll = !0, a(this._settings.container, "scroll", this._handleScrollFn))
144    }, k.prototype._stopScrollHandler = function () {
145        this._isHandlingScroll && (this._isHandlingScroll = !1, b(this._settings.container, "scroll", this._handleScrollFn))
146    }, k.prototype.handleScroll = function () {
147        var a, b, c;
148        this._settings && (b = d(), c = this._settings.throttle, 0 !== c ? (a = c - (b - this._previousLoopTime), 0 >= a || a > c ? (this._loopTimeout && (clearTimeout(this._loopTimeout), this._loopTimeout = null), this._previousLoopTime = b, this._loopThroughElements()) : this._loopTimeout || (this._loopTimeout = setTimeout(j(function () {
149            this._previousLoopTime = d(), this._loopTimeout = null, this._loopThroughElements()
150        }, this), a))) : this._loopThroughElements())
151    }, k.prototype.update = function () {
152        this._elements = f(this._queryOriginNode.querySelectorAll(this._settings.elements_selector)), this._purgeElements(), this._loopThroughElements(), this._startScrollHandler()
153    }, k.prototype.destroy = function () {
154        b(window, "resize", this._handleScrollFn), this._loopTimeout && (clearTimeout(this._loopTimeout), this._loopTimeout = null), this._stopScrollHandler(), this._elements = null, this._queryOriginNode = null, this._settings = null
155    }, k
156});
157//# sourceMappingURL=lazyload.min.js.map