https://comercioaustral.com/wp-content/plugins/envirra-extensions/…/envirra-reading-progress.js?ver=1.0.0.3

1"use strict";
2
3// Set jQuery to NoConflict Mode
4jQuery.noConflict();
5(function ($, window, document, undefined) {
6	$(function () {
7		var $document = $(document);
8		var $bar = $(".vw-reading-progress");
9		var $contentarea = $(".vw-main-post");
10
11		// Exit when no content area
12		if (!$contentarea.length) return;
13
14		// Get start and end point of content aread
15		var viewport = window.innerHeight;
16		var viewportThreshold = viewport * 0.5; // Offset -50% of viewport
17		var start = $contentarea.offset().top - viewportThreshold;
18		var end = start + $contentarea.outerHeight() - viewportThreshold;
19
20		var onScroll = (e) => {
21			var scrollTop = $document.scrollTop();
22
23			if (scrollTop > start && scrollTop < end) {
24				$bar.removeClass("vw-reading-progress-inactive");
25				$bar.addClass("vw-reading-progress-active");
26				$bar.css("width", ((scrollTop - start) / (end - start)) * 100 + "%");
27			} else {
28				$bar.removeClass("vw-reading-progress-active");
29				$bar.addClass("vw-reading-progress-inactive");
30			}
31		};
32
33		document.addEventListener("scroll", onScroll, { passive: true });
34	});
35})(jQuery, window, document);