Created
September 4, 2018 03:05
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/// Logica | |
// Identificar o clique no menu | |
// Verificar o item que foi clicado e fazer referência com o alvo | |
// Verificar a distância entre o alvo e o topo | |
// Animar o scroll até o alvo | |
/// /////////////////////////////////////////////////////////////////// | |
// Pegar a lista de links interno da pagina | |
const $menulinks = document.querySelectorAll('.navigation__link[href^="#"]') | |
// Capturar o click em um link especifico | |
$menulinks.forEach(link => { | |
link.addEventListener('click', scrollToIdOnClick) | |
}) | |
function scrollToIdOnClick (event) { | |
// Prevenir efeito padrao do browser | |
event.preventDefault() | |
const to = getScrollTopByHref(event.target) | |
scrollToPosition(to) | |
} | |
// Verificar a distância entre o alvo e o topo | |
function getScrollTopByHref (element) { | |
const id = element.getAttribute('href') | |
return document.querySelector(id).offsetTop | |
} | |
// Animação do scroll até o alvo | |
function scrollToPosition (to) { | |
window.scroll({ | |
top: to, | |
behavior: 'smooth' | |
}) | |
// smoothScrollTo(0, to, 500) //suporte a broswers antigos | |
} | |
// Caso deseje suporte a browsers antigos / que não suportam scroll smooth nativo | |
/** | |
* Smooth scroll animation | |
* @param {int} endX: destination x coordinate | |
* @param {int} endY: destination y coordinate | |
* @param {int} duration: animation duration in ms | |
*/ | |
/* | |
function smoothScrollTo (endX, endY, duration) { | |
const startX = window.scrollX || window.pageXOffset | |
const startY = window.scrollY || window.pageYOffset | |
const distanceX = endX - startX | |
const distanceY = endY - startY | |
const startTime = new Date().getTime() | |
duration = typeof duration !== 'undefined' ? duration : 400 | |
// Easing function | |
const easeInOutQuart = (time, from, distance, duration) => { | |
if ((time /= duration / 2) < 1) return distance / 2 * time * time * time * time + from | |
return -distance / 2 * ((time -= 2) * time * time * time - 2) + from | |
} | |
const timer = setInterval(() => { | |
const time = new Date().getTime() - startTime | |
const newX = easeInOutQuart(time, startX, distanceX, duration) | |
const newY = easeInOutQuart(time, startY, distanceY, duration) | |
if (time >= duration) { | |
clearInterval(timer) | |
} | |
window.scroll(newX, newY) | |
}, 1000 / 60) // 60 fps | |
}; | |
*/ |
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