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synced 2024-12-16 21:46:22 -05:00
37 lines
824 B
JavaScript
37 lines
824 B
JavaScript
const nav = document.querySelector('body > header');
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if (!window.matchMedia('(prefers-reduced-motion)').matches) {
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window.addEventListener('scroll', onScroll, { passive: true });
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}
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let prev = -1;
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let prevDir = 0;
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let threshold = 32;
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function onScroll() {
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const curr = window.scrollY;
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const dir = curr > prev ? 1 : -1;
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if (curr < threshold) {
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show();
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document.documentElement.classList.add('initial');
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} else if (dir !== prevDir) {
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if (dir === 1) {
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hide();
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} else {
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show();
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}
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}
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prev = curr;
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}
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const hide = () => {
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nav.classList.add('hidden');
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document.documentElement.classList.add('scrolled');
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document.documentElement.classList.remove('initial');
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};
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const show = () => {
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nav.classList.remove('hidden');
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document.documentElement.classList.remove('scrolled');
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};
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