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ScrollTo animation using pure javascript and no jquery
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| document.getElementsByTagName('button')[0].onclick = function () { | |
| scrollTo(document.body, 0, 1250); | |
| } | |
| function scrollTo(element, to, duration) { | |
| var start = element.scrollTop, | |
| change = to - start, | |
| currentTime = 0, | |
| increment = 20; | |
| var animateScroll = function(){ | |
| currentTime += increment; | |
| var val = Math.easeInOutQuad(currentTime, start, change, duration); | |
| element.scrollTop = val; | |
| if(currentTime < duration) { | |
| setTimeout(animateScroll, increment); | |
| } | |
| }; | |
| animateScroll(); | |
| } | |
| //t = current time | |
| //b = start value | |
| //c = change in value | |
| //d = duration | |
| Math.easeInOutQuad = function (t, b, c, d) { | |
| t /= d/2; | |
| if (t < 1) return c/2*t*t + b; | |
| t--; | |
| return -c/2 * (t*(t-2) - 1) + b; | |
| }; |
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