scroll animation move
// Detect request animation frame
var scroll = window.requestAnimationFrame ||
// IE Fallback
function(callback){ window.setTimeout(callback, 1000/1000)};
var elementsToShow = document.querySelectorAll('.show-on-scroll');
function loop() {
elementsToShow.forEach(function (element) {
if (isElementInViewport(element)) {
element.classList.add('is-visible');
} else {
element.classList.remove('is-visible');
}
});
scroll(loop);
}
// Call the loop for the first time
loop();
// Helper function from: http://stackoverflow.com/a/7557433/274826
function isElementInViewport(el) {
// special bonus for those using jQuery
if (typeof jQuery === "function" && el instanceof jQuery) {
el = el[0];
}
var rect = el.getBoundingClientRect();
return (
(rect.top <= 0
&& rect.bottom >= 0)
||
(rect.bottom >= (window.innerHeight || document.documentElement.clientHeight) &&
rect.top <= (window.innerHeight || document.documentElement.clientHeight))
||
(rect.top >= 0 &&
rect.bottom <= (window.innerHeight || document.documentElement.clientHeight))
);
}