32 lines
947 B
JavaScript
32 lines
947 B
JavaScript
export function navInvestigation(){
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const nav = document.getElementById('nav-investigation');
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if (!nav) return;
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const items = nav.querySelectorAll('li');
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const headerOffset = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--h-header')) || 0;
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const sections = Array.from(items).map(li => {
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const href = li.querySelector('a')?.getAttribute('href');
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const target = href ? document.querySelector(href) : null;
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return { li, target };
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}).filter(s => s.target);
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const update = () => {
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const scrollY = window.scrollY + headerOffset;
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let current = sections[0];
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for (const section of sections) {
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if (section.target.offsetTop <= scrollY) {
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current = section;
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}
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}
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items.forEach(li => li.classList.remove('is-selected'));
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if (current) current.li.classList.add('is-selected');
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};
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window.addEventListener('scroll', update, { passive: true });
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update();
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}
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