mirror of https://github.com/Damillora/Yuika
54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
$(document).ready(function () {
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var nav = document.querySelector('.index-navbar');
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var feed = document.querySelector('#post');
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var lastScrollY = window.scrollY;
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var lastWindowHeight = window.innerHeight;
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var lastDocumentHeight = $(document).height();
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var ticking = false;
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function onScroll() {
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lastScrollY = window.scrollY;
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requestTick();
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}
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function onResize() {
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lastWindowHeight = window.innerHeight;
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lastDocumentHeight = $(document).height();
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requestTick();
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}
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function requestTick() {
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if (!ticking) {
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requestAnimationFrame(update);
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}
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ticking = true;
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}
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function update() {
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var trigger = feed.getBoundingClientRect().top + window.scrollY;
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var progressMax = lastDocumentHeight - lastWindowHeight;
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// show/hide nav
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if (lastScrollY >= trigger - 20) {
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nav.classList.add('fixed');
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nav.classList.add('nav-fixed');
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nav.classList.remove('absolute');
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} else {
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nav.classList.remove('fixed');
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nav.classList.remove('nav-fixed');
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nav.classList.add('absolute');
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}
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ticking = false;
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}
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window.addEventListener('scroll', onScroll, { passive: true });
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window.addEventListener('resize', onResize, false);
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update();
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});
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