50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
function hasScrollBehavior() {
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return 'scrollBehavior' in document.documentElement.style;
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}
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function smoothScroll() {
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var currentY = window.scrollY;
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var int = setInterval(function () {
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window.scrollTo(0, currentY);
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if (currentY > 500) {
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currentY -= 70;
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} else if (currentY > 100) {
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currentY -= 50;
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} else {
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currentY -= 10;
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}
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if (currentY <= 0) clearInterval(int);
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}, 1000 / 60); // 60fps
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}
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function scrollToTop() {
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// document.getElementById('page-title').scrollIntoView({behavior: 'smooth'});
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if (hasScrollBehavior()) {
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window.scrollTo({ top: 0, behavior: 'smooth' });
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} else {
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smoothScroll();
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}
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}
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function toggleScrollUpButton() {
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var y = window.scrollY;
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var e = document.getElementById('scroll-to-top');
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if (y >= 350) {
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e.style.transform = 'translateY(-30%)'
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e.style.opacity = 1;
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} else {
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e.style.opacity = 0;
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e.style.transform = 'translateY(30%)'
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}
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}
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document.addEventListener("DOMContentLoaded", function () {
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document.removeEventListener("DOMContentLoaded", arguments.callee, false);
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window.addEventListener("scroll", toggleScrollUpButton);
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var e = document.getElementById('scroll-to-top');
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e.addEventListener('click', scrollToTop, false);
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}, false); |