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Natif smooth scroll
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| const lerp = (a, b, n) => (1 - n) * a + n * b; | |
| class SmoothScroll { | |
| constructor() { | |
| this.DOM = { | |
| main: document.querySelector('main'), | |
| wrapper: document.querySelector('.site-container') | |
| }; | |
| if (!this.DOM.main) throw new Error('Please provide a main element.'); | |
| if (!this.DOM.wrapper) throw new Error('Please provide a div with a `.site-container` class.'); | |
| this.scroll = { | |
| ease: 0.07, | |
| current: 0, | |
| target: 0 | |
| }; | |
| this.binds(); | |
| this.handleResize(); | |
| this.setStyle(); | |
| this.events(); | |
| requestAnimationFrame(() => this.render()); | |
| } | |
| binds() { | |
| this.handleResize = this.handleResize.bind(this); | |
| this.handleScroll = this.handleScroll.bind(this); | |
| } | |
| events() { | |
| window.addEventListener('resize', this.handleResize); | |
| window.addEventListener('scroll', this.handleScroll); | |
| } | |
| handleResize() { | |
| document.body.style.height = `${this.DOM.wrapper.scrollHeight}px`; | |
| } | |
| handleScroll() { | |
| this.scroll.target = window.pageYOffset || document.documentElement.scrollTop; | |
| } | |
| setStyle() { | |
| Object.assign(this.DOM.main.style, { | |
| position: 'fixed', | |
| top: 0, | |
| left: 0, | |
| width: '100%', | |
| height: '100%', | |
| overflow: 'hidden' | |
| }); | |
| } | |
| transform(element, y) { | |
| element.style.transform = `translate3d(0, ${-Math.round(y)}px, 0)`; | |
| } | |
| render() { | |
| this.scroll.current = lerp(this.scroll.current, this.scroll.target, this.scroll.ease); | |
| this.scroll.current = Math.floor(this.scroll.current); | |
| this.transform(this.DOM.wrapper, this.scroll.current); | |
| requestAnimationFrame(() => this.render()); | |
| } | |
| } |
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