https://msbis.com/wp-content/plugins/smooth-back-to-top-button/ass…/js/smooth-back-to-top-button.js?ver=1.3.2

1(function () {
2    "use strict";
3
4    function initButton() {
5        var buttonPath = document.querySelector('.smooth-back-to-top-button path, .smooth-back-to-top-button rect');
6
7        if (!buttonPath) {
8            return;
9        }
10
11        var pathLength = buttonPath.getTotalLength();
12
13        buttonPath.style.strokeDasharray = pathLength + ' ' + pathLength;
14        buttonPath.style.strokeDashoffset = pathLength;
15
16        var isTicking = false;
17
18        var updateButtonProgress = function () {
19            var scroll = window.scrollY;
20            var height = document.documentElement.scrollHeight - window.innerHeight;
21
22            // Calculate progress, handling division by zero if page is smaller than viewport
23            var progress = height > 0 ? pathLength - (scroll * pathLength / height) : pathLength;
24
25            buttonPath.style.strokeDashoffset = progress;
26            isTicking = false;
27        };
28
29        var onScroll = function () {
30            if (!isTicking) {
31                window.requestAnimationFrame(updateButtonProgress);
32                isTicking = true;
33            }
34        };
35
36        updateButtonProgress();
37
38        // Use passive listener for better scroll performance on mobile
39        window.addEventListener('scroll', onScroll, { passive: true });
40    }
41
42    if (document.readyState === 'loading') {
43        document.addEventListener('DOMContentLoaded', initButton);
44    } else {
45        initButton();
46    }
47})();