mirror of https://github.com/explosion/spaCy.git
26 lines
879 B
JavaScript
26 lines
879 B
JavaScript
//- ----------------------------------
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//- 💫 MAIN JAVASCRIPT
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//- ----------------------------------
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'use strict'
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{
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const nav = document.querySelector('.js-nav')
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const fixedClass = 'is-fixed'
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let vh, scrollY = 0, scrollUp = false
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const updateVh = () => Math.max(document.documentElement.clientHeight, window.innerHeight || 0)
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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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if (newScrollY != scrollY) scrollUp = newScrollY <= scrollY
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scrollY = newScrollY
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if(scrollUp && !(isNaN(scrollY) || scrollY <= vh)) nav.classList.add(fixedClass)
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else if(!scrollUp || (isNaN(scrollY) || scrollY <= vh/2)) nav.classList.remove(fixedClass)
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}
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window.addEventListener('scroll', () => requestAnimationFrame(updateNav))
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}
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