how can i add an easing/animation/slowly moving to this function? At the moment it just jumps. Now it should move to the "anchor" with an animation.
<script type='text/javascript'>
setTimeout("window.scrollBy(0,270);",3000);
</script>
also possible with plain javascript using request animation frame..
// first add raf shim
// http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
// main function
function scrollToY(scrollTargetY, speed, easing) {
// scrollTargetY: the target scrollY property of the window
// speed: time in pixels per second
// easing: easing equation to use
var scrollY = window.scrollY,
scrollTargetY = scrollTargetY || 0,
speed = speed || 2000,
easing = easing || 'easeOutSine',
currentTime = 0;
// min time .1, max time .8 seconds
var time = Math.max(.1, Math.min(Math.abs(scrollY - scrollTargetY) / speed, .8));
// easing equations from https://github.com/danro/easing-js/blob/master/easing.js
var PI_D2 = Math.PI / 2,
easingEquations = {
easeOutSine: function (pos) {
return Math.sin(pos * (Math.PI / 2));
},
easeInOutSine: function (pos) {
return (-0.5 * (Math.cos(Math.PI * pos) - 1));
},
easeInOutQuint: function (pos) {
if ((pos /= 0.5) < 1) {
return 0.5 * Math.pow(pos, 5);
}
return 0.5 * (Math.pow((pos - 2), 5) + 2);
}
};
// add animation loop
function tick() {
currentTime += 1 / 60;
var p = currentTime / time;
var t = easingEquations[easing](p);
if (p < 1) {
requestAnimFrame(tick);
window.scrollTo(0, scrollY + ((scrollTargetY - scrollY) * t));
} else {
console.log('scroll done');
window.scrollTo(0, scrollTargetY);
}
}
// call it once to get started
tick();
}
// scroll it!
scrollToY(0, 1500, 'easeInOutQuint');
For anyone viewing this question in 2019: this can now be done natively by using
window.scrollBy({
top: 0,
left: 270,
behavior: 'smooth'
});
This works in all major browsers except edge and safari. See https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollBy#Examples
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