Created
January 30, 2020 12:49
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Плавный scrollTo на чистом js
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| //scrollTo | |
| function scrollIt(destination, duration = 200, easing = 'linear', callback) { | |
| const easings = { | |
| linear(t) { | |
| return t; | |
| }, | |
| easeInQuad(t) { | |
| return t * t; | |
| }, | |
| easeOutQuad(t) { | |
| return t * (2 - t); | |
| }, | |
| easeInOutQuad(t) { | |
| return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t; | |
| }, | |
| easeInCubic(t) { | |
| return t * t * t; | |
| }, | |
| easeOutCubic(t) { | |
| return (--t) * t * t + 1; | |
| }, | |
| easeInOutCubic(t) { | |
| return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1; | |
| }, | |
| easeInQuart(t) { | |
| return t * t * t * t; | |
| }, | |
| easeOutQuart(t) { | |
| return 1 - (--t) * t * t * t; | |
| }, | |
| easeInOutQuart(t) { | |
| return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * (--t) * t * t * t; | |
| }, | |
| easeInQuint(t) { | |
| return t * t * t * t * t; | |
| }, | |
| easeOutQuint(t) { | |
| return 1 + (--t) * t * t * t * t; | |
| }, | |
| easeInOutQuint(t) { | |
| return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * (--t) * t * t * t * t; | |
| } | |
| }; | |
| const start = window.pageYOffset; | |
| const startTime = 'now' in window.performance ? performance.now() : new Date().getTime(); | |
| const documentHeight = Math.max(document.body.scrollHeight, document.body.offsetHeight, document.documentElement.clientHeight, document.documentElement.scrollHeight, document.documentElement.offsetHeight); | |
| const windowHeight = window.innerHeight || document.documentElement.clientHeight || document.getElementsByTagName('body')[0].clientHeight; | |
| const destinationOffset = typeof destination === 'number' ? destination : destination.offsetTop; | |
| const destinationOffsetToScroll = Math.round(documentHeight - destinationOffset < windowHeight ? documentHeight - windowHeight : destinationOffset); | |
| if ('requestAnimationFrame' in window === false) { | |
| window.scroll(0, destinationOffsetToScroll); | |
| if (callback) { | |
| callback(); | |
| } | |
| return; | |
| } | |
| function scroll() { | |
| const now = 'now' in window.performance ? performance.now() : new Date().getTime(); | |
| const time = Math.min(1, ((now - startTime) / duration)); | |
| const timeFunction = easings[easing](time); | |
| window.scroll(0, Math.ceil((timeFunction * (destinationOffsetToScroll - start)) + start)); | |
| if (window.pageYOffset === destinationOffsetToScroll) { | |
| if (callback) { | |
| callback(); | |
| } | |
| return; | |
| } | |
| requestAnimationFrame(scroll); | |
| } | |
| scroll(); | |
| } | |
| const scrollToLinks = document.querySelectorAll('.js-scroll-to'); | |
| Array.prototype.forEach.call(scrollToLinks, function (el, i) { | |
| el.onclick = function () { | |
| let taregetId = this.dataset.target | |
| let targetBlock = document.querySelector(taregetId); | |
| scrollIt(targetBlock, 500, 'easeOutQuad'); | |
| }; | |
| }); |
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