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https://github.com/explosion/spaCy.git
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56 lines
1.9 KiB
JavaScript
56 lines
1.9 KiB
JavaScript
//- ----------------------------------
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//- 💫 MAIN JAVASCRIPT
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//- ----------------------------------
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'use strict';
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const $ = document.querySelector.bind(document);
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const $$ = document.querySelectorAll.bind(document);
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{
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const updateVh = () => Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
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const nav = $('.js-nav');
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const sidebar = $('.js-sidebar');
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const vhPadding = 525;
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let vh = updateVh();
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let scrollY = 0;
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let scrollUp = false;
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const updateNav = () => {
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const vh = updateVh();
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const newScrollY = (window.pageYOffset || document.scrollTop) - (document.clientTop || 0);
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scrollUp = newScrollY <= scrollY;
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scrollY = newScrollY;
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if(scrollUp && !(isNaN(scrollY) || scrollY <= vh)) nav.classList.add('is-fixed');
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else if(!scrollUp || (isNaN(scrollY) || scrollY <= vh/2)) nav.classList.remove('is-fixed');
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}
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const updateSidebar = () => {
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const sidebar = $('.js-sidebar');
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if(sidebar.offsetTop - scrollY <= 0) sidebar.classList.add('is-fixed');
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else sidebar.classList.remove('is-fixed');
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[...$$('[data-section]')].map(el => {
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const trigger = el.getAttribute('data-section');
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if(trigger) {
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const target = $(`#${trigger}`);
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const offset = parseInt(target.offsetTop);
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const height = parseInt(target.scrollHeight);
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if((offset - scrollY) <= vh/2 && (offset - scrollY) > -height + vhPadding) {
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[...$$('[data-section]')].forEach(item => item.classList.remove('is-active'));
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$(`[data-section="${trigger}"]`).classList.add('is-active');
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}
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}
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});
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}
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window.addEventListener('resize', () => vh = updateVh());
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window.addEventListener('scroll', updateNav);
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if($('.js-sidebar')) window.addEventListener('scroll', updateSidebar);
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}
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