https://biletytos.pl/rezerwacja/js/components/scroll-to.js

1function ScrollTo(scrollToElement, clickedElement, callback) {
2    if (!scrollToElement) {
3        throw new Error('Parametr jest wymagany!');
4    }
5
6    this.scrollToElement = scrollToElement;
7    this.clickedElement = clickedElement ? clickedElement : null;
8    this.callback = callback;
9    this.duration = 1000;
10    this.events();
11}
12
13ScrollTo.prototype = {
14    constructor: ScrollTo,
15
16    events: function () {
17        const _this = this;
18
19        if (this.clickedElement) {
20            this.clickedElement.on('click', function () {
21                _this.scroll();
22            });
23        }
24    },
25
26    // A function to call once the animation is complete, called once per matched element.
27    animationIsComplete: function () {
28        if (this.callback) {
29            this.callback();
30        }
31    },
32
33    getScrollPosition: function () {
34        return $(window).scrollTop();
35    },
36
37    scroll: function () {
38        const _this = this;
39
40        $('html, body').animate(
41            {
42                scrollTop: _this.scrollToElement.position().top,
43            },
44            this.duration,
45            'easeInOutExpo',
46            function () {
47                $(this).clearQueue();
48                _this.animationIsComplete();
49            }
50        );
51    },
52};