https://elogic.co/wp-content/themes/elogic/resources/js/table-of-content.js?ver=4.0.0

1jQuery(document).ready(function ($) {
2    table_of_content();
3
4    function table_of_content() {
5        if(jQuery('.table_of_content_body ul li').length <= 0) {
6            var header = jQuery('.post-text').find(':header:not("h1"):not(".ct")');
7            var table_of_content = jQuery('.table_of_content_body ul');
8            header.each(function () {
9                var _this = jQuery(this);
10                if (!_this.attr('id')) {
11                    var id = _this.text().replace(/[^A-Z0-9]/ig, "_");
12                    _this.attr('id', id);
13                }
14                var tag = _this.prop('tagName');
15                if (tag) {
16                    if (tag === 'H2') {
17                        table_of_content.append("<li><a href='#" + _this.attr('id') + "'>" + _this.text().replace('♦ ','') + "</a></li>");
18                    } else {
19                        table_of_content.append("<li class='child_li'><a href='#" + _this.attr('id') + "'>" + _this.text().replace('♦ ','') + "</a></li>");
20                    }
21                }
22            });
23
24            window.addEventListener('scroll', function() {
25                header.each(function() {
26                    var _this = jQuery(this);
27                    if (isScrolledIntoView(_this)) {
28                        var id = _this.attr('id');
29                        table_of_content.find('li a').removeClass('active');
30                        table_of_content.find('li a[href="#'+id+'"]').addClass('active');
31                    }
32                });
33            });
34
35            function isScrolledIntoView(elem) {
36                var docViewTop = jQuery(window).scrollTop();
37                var docViewBottom = docViewTop + jQuery(window).height();
38
39                var elemTop = jQuery(elem).offset().top + 290;
40                var elemBottom = elemTop + jQuery(elem).height();
41
42                return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
43            }
44        }
45    }
46
47    jQuery('.nsbp-hero-content .table_of_content_section .table_of_content_head').on('click', function () {
48        jQuery(this).toggleClass('sp-hide');
49    });
50});