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// Vanillatop : Lightweight plugin in vanilla javascript to animate scrolling to the top of the page.
//
// @package vanillatop
// @version v1.0.6
// @author Bernard Collet <webmaster@russianconcept.com>
// @copyright (c) 2019 Bernard Collet
// @license MIT <https://opensource.org/licenses/MIT>
// @link https://github.com/bernydole/vanillatop
//
(function () {
document.addEventListener("DOMContentLoaded", function () {
var anchorToTop = document.querySelector('.vanillatop'),
offset = 280, // browser window scroll (in pixels) after which the "back to top" link is shown
scrollDuration = 700;
function scrollToTop(duration) {
var start = window.pageYOffset,
startTime = Math.floor(Date.now());
function scroll() {
Math.easeInOutQuad = function (t) {
return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
};
var time = Math.min(1, ((Math.floor(Date.now()) - startTime) / duration));
window.scroll(0, Math.ceil((Math.easeInOutQuad(time) * (0 - start)) + start));
if (window.pageYOffset === 0) {
callback();
}
requestAnimationFrame(scroll);
}
scroll();
}
function scrollingDown() {
if (document.body.scrollTop > offset || document.documentElement.scrollTop > offset) {
anchorToTop.removeAttribute("style", "transform: translateX(120px);");
anchorToTop.setAttribute("style", "transform: translateX(0);");
} else {
anchorToTop.removeAttribute("style", "transform: translateX(0);");
anchorToTop.setAttribute("style", "transform: translateX(120px);");
}
}
anchorToTop.addEventListener('click', function () {
(!window.requestAnimationFrame) ? window.scrollTo(0, 0): scrollToTop(scrollDuration);
});
window.addEventListener('scroll', scrollingDown);
});
})();