https://www.videograph.ai/wp-content/themes/digeco/assets/js/jquery.navpoints.js?ver=1.8

1/*
2 * NavPoints
3 * https://github.com/Ins-V/navpoints
4 *
5 * Author: Vitaliy Gusarev
6 *
7 * Licensed under the MIT license.
8 */
9;(function($) {
10	var settings = {
11		speed: 300,
12		offset: 0,
13		currentClass: 'active',
14		updateHash: false,
15		classToParent: false
16	}
17
18	var NavPoints = {
19		init: function(options, navbar) {
20			settings = $.extend(settings, options);
21			this.$navbar = $(navbar);
22			this.$items = this.$navbar.find('a:not(.externals)');
23			this.$window = $(window);
24			this.hashNow = undefined;
25
26			this.$items.on('click', this.clicked);
27			this.$window.on('scroll', $.proxy(this.scrollPage, this));
28			this.$window.on('resize', $.proxy(this.scrollPage, this));
29		},
30		clicked: function(e) {
31			var hash = $(this).attr('href');
32			if(hash !== '#' && /^#/.test(hash)) {
33				e.preventDefault();
34				var position = $(hash).offset().top - settings.offset;
35
36				$('html, body').animate({
37					scrollTop: position
38				}, settings.speed);
39			}
40		},
41		scrollPage: function() {
42			var self = this,
43				sections = [],
44				result = undefined;
45			self.$items.each(function() {
46				var hash = $(this).attr('href');
47				if(hash !== '#' && /^#/.test(hash)) {
48					var section = $(hash);
49					if (section.length) sections.push(section);
50				}
51			});
52
53			for (var i = 0; i < sections.length; i++) {
54				var section = sections[i],
55					sectionHeight = section.height(),
56					sectionTop = section.offset().top,
57					windowTop = self.$window.scrollTop(),
58					windoHeight = self.$window.height();
59
60				if (windowTop <= sectionTop && (sectionHeight + sectionTop) < (windowTop + windoHeight)) {
61					result = sections[i].attr('id');
62					break;
63				}
64			}
65
66			if (result) {
67				if (settings.updateHash) {
68					var hash = '#' + result;
69					if (self.hashNow != hash) {
70						self.hashNow = hash;
71						history.pushState({}, '', hash);
72					}
73				}
74
75				if (settings.classToParent) {
76					self.$items.parent().removeClass(settings.currentClass);
77					$('a[href="#' + result + '"]').parent().addClass(settings.currentClass);
78				}
79				else {
80					self.$items.removeClass(settings.currentClass);
81					$('a[href="#' + result + '"]').addClass(settings.currentClass);
82				}
83			}
84		}
85	}
86
87	$.fn.navpoints = function(options) {
88		this.each(function() {
89			var navpoints = Object.create(NavPoints);
90			navpoints.init(options, this);
91		});
92	}
93})(jQuery);