https://www.nelsonmandelachildrensfund.com/wp-content/plugins/catc…catch-scroll-progress-bar-public.js?ver=2.1

1(function( $ ) {
2	'use strict';
3	
4	// The DOM needs to be fully loaded (including graphics, iframes, etc)
5	$(window).load(function() {
6
7		// Maximum value for the progressbar
8		var winHeight = $(window).height(),
9		docHeight = $(document).height();
10		var max = docHeight - winHeight;
11		$('.catchProgressbar').attr('max', max);
12
13		// Inital value (if the page is loaded within an anchor)
14		var value = $(window).scrollTop();
15		$('.catchProgressbar').attr('value', value);
16		// Maths & live update of progressbar value
17		$(document).on('scroll', function() {
18			value = $(window).scrollTop();
19			$('.catchProgressbar').attr('value', value);
20		});
21	});
22	
23})( jQuery );