https://pravoslavie.ru/static/js/footer.js?20190209

1var $window = $(window),
2	lastScrollTop = 0,
3	animationEnd = true;
4
5function onScroll(e) {
6
7    var top = $window.scrollTop();
8
9   // if (!lastElemOnScreen($('.block-banner').last()[0])) {
10//        $('.block-footer').slideUp(100, false, function () {
11//            animationEnd = true;
12//        });
13
14   // } else {
15        if (animationEnd) {
16
17            if ($('.block-footer').length > 0){
18               /* if (lastScrollTop > top) {
19
20                    animationEnd = false;
21                    $('.block-footer__inner').slideUp(200, false, function () {
22                        animationEnd = true;	
23                    });
24                } else if (lastScrollTop < top) {
25
26                    animationEnd = false;
27                    $('.block-footer__inner').slideDown(200, false, function () {
28                        animationEnd = true;
29                    });                    
30                }*/
31				if($('.block-footer__inner').is(':visible')){
32					animationEnd = false;
33                    $('.block-footer__inner').slideUp(200, false, function () {
34                        animationEnd = true;
35						$('.wrapper__inner').css('padding-bottom', '20px');
36						$('.block-footer__arrow').removeClass('block-footer__arrow_show');	
37                    }); 
38				}
39            }
40        }
41    //}
42    lastScrollTop = top;
43}
44
45$(document).ready(function () {
46    $window.on('scroll', onScroll);
47
48	$('.block-footer__arrow').click(function () {
49		if($('.block-footer__inner').is(':visible')) {
50			$('.block-footer__inner').slideUp();
51			$(this).removeClass('block-footer__arrow_show');
52			$('.wrapper__inner').css('padding-bottom', '20px');
53		} else {
54			$('.block-footer__inner').slideDown();
55			$(this).addClass('block-footer__arrow_show');
56			$('.wrapper__inner').css('padding-bottom', '300px');
57		}	
58		return false;		
59	});
60	
61	$('.block-footer__input')
62		.focus(function() {
63			if($(this).val() == 'Ваш E-mail') $(this).val('');
64		})
65		.blur(function() {
66			if($(this).val() == '') $(this).val('Ваш E-mail'); 
67		});
68});
69
70function lastElemOnScreen(element) {
71    try {
72        var scroll_pos = $(window).scrollTop();
73        var window_height = $(window).height();
74        var el_top = $(element).offset().top;
75        var el_height = $(element).height();
76        var el_bottom = el_top + el_height;
77        if (scroll_pos + window_height - el_bottom > 0) {
78            return true;
79        } else {
80            return false;
81        }
82    } catch (e) {
83    }
84
85}