95 lines
3.5 KiB
JavaScript
95 lines
3.5 KiB
JavaScript
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window.addEventListener('DOMContentLoaded', () => {
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const tocElement = document.querySelector('.post-toc-wrap');
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const navItems = tocElement.querySelectorAll('.post-toc li');
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if (navItems.length > 0) {
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const sections = [...navItems].map(element => {
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var link = element.querySelector('a.nav-link');
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// TOC item animation navigate.
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link.addEventListener('click', event => {
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event.preventDefault();
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var target = document.getElementById(event.currentTarget.getAttribute('href').replace('#', ''));
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var offset = target.getBoundingClientRect().top + window.scrollY - 70;
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window.anime({
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targets: document.scrollingElement,
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duration: 500,
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easing: 'linear',
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scrollTop: offset
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});
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});
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return document.getElementById(link.getAttribute('href').replace('#', ''));
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});
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function activateNavByIndex(target) {
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if (target.classList.contains('active-current')) return;
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document.querySelectorAll('.post-toc .active').forEach(element => {
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element.classList.remove('active', 'active-current');
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});
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target.classList.add('active', 'active-current');
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var parent = target.parentNode;
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while (!parent.matches('.post-toc')) {
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if (parent.matches('li')) parent.classList.add('active');
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parent = parent.parentNode;
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}
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// Scrolling to center active TOC element if TOC content is taller then viewport.
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window.anime({
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targets: tocElement,
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duration: 200,
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easing: 'linear',
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scrollTop: tocElement.scrollTop - (tocElement.offsetHeight / 2) + target.getBoundingClientRect().top - tocElement.getBoundingClientRect().top
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});
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}
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function findIndex(entries) {
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let index = 0;
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let entry = entries[index];
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if (entry.boundingClientRect.top > 0) {
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index = sections.indexOf(entry.target);
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return index === 0 ? 0 : index - 1;
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}
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for (; index < entries.length; index++) {
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if (entries[index].boundingClientRect.top <= 0) {
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entry = entries[index];
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} else {
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return sections.indexOf(entry.target);
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}
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}
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return sections.indexOf(entry.target);
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}
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function createIntersectionObserver(marginTop) {
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marginTop = Math.floor(marginTop + 10000);
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let intersectionObserver = new IntersectionObserver((entries, observe) => {
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let scrollHeight = document.documentElement.scrollHeight + 100;
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if (scrollHeight > marginTop) {
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observe.disconnect();
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createIntersectionObserver(scrollHeight);
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return;
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}
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let index = findIndex(entries);
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activateNavByIndex(navItems[index]);
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}, {
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rootMargin: marginTop + 'px 0px -100% 0px',
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threshold: 0
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});
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sections.forEach(element => {
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element && intersectionObserver.observe(element);
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});
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}
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createIntersectionObserver(document.documentElement.scrollHeight);
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} else {
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tocElement.innerHTML = '';
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}
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});
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