Cross browser JavaScript (not jQuery…) scroll to top animation


I'm looking for a simple, cross-browser "scroll to top" animation I can apply to a link. I don't want to require a JS library such as jQuery/Moo, etc.

// jQuery Equivilant to convert to pure JS...
$('html, body').animate({scrollTop:0}, 400);

I'm a perfect case for someone who should have learned JS 100% before jumping into a library. :(

function scrollTo(element, to, duration) {
    if (duration <= 0) return;
    var difference = to - element.scrollTop;
    var perTick = difference / duration * 10;

    setTimeout(function() {
        element.scrollTop = element.scrollTop + perTick;
        if (element.scrollTop === to) return;
        scrollTo(element, to, duration - 10);
    }, 10);
}

Demo:

function runScroll() {
  scrollTo(document.body, 0, 600);
}
var scrollme;
scrollme = document.querySelector("#scrollme");
scrollme.addEventListener("click",runScroll,false)

function scrollTo(element, to, duration) {
  if (duration <= 0) return;
  var difference = to - element.scrollTop;
  var perTick = difference / duration * 10;

  setTimeout(function() {
    element.scrollTop = element.scrollTop + perTick;
    if (element.scrollTop == to) return;
    scrollTo(element, to, duration - 10);
  }, 10);
}
<p>Very long page.Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. 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</p>
<button id=scrollme type="button">To the top</button>


looks like there's a lot of solutions already. anyway, here's another one, uses easing equations..

// 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 || document.documentElement.scrollTop,
        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 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');

window.scroll({top: 0, left: 0, behavior: 'smooth' });

Got it from an article about Smooth Scrolling.

If needed, there are some polyfills available.


I modified TimWolla's answer to use quadratic in-out easing ( a little smoother :). Here is an example in action: on jsFiddle. Easing functions are available here: Robert Penner's Easing functions

document.getElementsByTagName('button')[0].onclick = function () {
    scrollTo(document.body, 0, 1250);   
}

function scrollTo(element, to, duration) {
    var start = element.scrollTop,
        change = to - start,
        increment = 20;

    var animateScroll = function(elapsedTime) {        
        elapsedTime += increment;
        var position = easeInOut(elapsedTime, start, change, duration);                        
        element.scrollTop = position; 
        if (elapsedTime < duration) {
            setTimeout(function() {
                animateScroll(elapsedTime);
            }, increment);
        }
    };

    animateScroll(0);
}

function easeInOut(currentTime, start, change, duration) {
    currentTime /= duration / 2;
    if (currentTime < 1) {
        return change / 2 * currentTime * currentTime + start;
    }
    currentTime -= 1;
    return -change / 2 * (currentTime * (currentTime - 2) - 1) + start;
}

Without JQuery code, Hope this will help you.

function TopscrollTo() {
if(window.scrollY!=0)
{
    setTimeout(function() {
       window.scrollTo(0,window.scrollY-30);
        TopscrollTo();
    }, 100);
   }
}

call this TopscrollTo() function on button click event or on any other element/event which you want.


I modified the code of @TimWolla to add more options and a some movement functions. Also, added support to crossbrowser with document.body.scrollTop and document.documentElement.scrollTop

// scroll to top
scrollTo(0, 1000);

// Element to move, time in ms to animate
function scrollTo(element, duration) {
    var e = document.documentElement;
    if(e.scrollTop===0){
        var t = e.scrollTop;
        ++e.scrollTop;
        e = t+1===e.scrollTop--?e:document.body;
    }
    scrollToC(e, e.scrollTop, element, duration);
}

// Element to move, element or px from, element or px to, time in ms to animate
function scrollToC(element, from, to, duration) {
    if (duration <= 0) return;
    if(typeof from === "object")from=from.offsetTop;
    if(typeof to === "object")to=to.offsetTop;

    scrollToX(element, from, to, 0, 1/duration, 20, easeOutCuaic);
}

function scrollToX(element, xFrom, xTo, t01, speed, step, motion) {
    if (t01 < 0 || t01 > 1 || speed<= 0) {
        element.scrollTop = xTo;
        return;
    }
    element.scrollTop = xFrom - (xFrom - xTo) * motion(t01);
    t01 += speed * step;

    setTimeout(function() {
        scrollToX(element, xFrom, xTo, t01, speed, step, motion);
    }, step);
}
function easeOutCuaic(t){
    t--;
    return t*t*t+1;
}

http://jsfiddle.net/forestrf/tPQSv/

Minified version: http://jsfiddle.net/forestrf/tPQSv/139/

// c = element to scroll to or top position in pixels
// e = duration of the scroll in ms, time scrolling
// d = (optative) ease function. Default easeOutCuaic
function scrollTo(c,e,d){d||(d=easeOutCuaic);var a=document.documentElement;if(0===a.scrollTop){var b=a.scrollTop;++a.scrollTop;a=b+1===a.scrollTop--?a:document.body}b=a.scrollTop;0>=e||("object"===typeof b&&(b=b.offsetTop),"object"===typeof c&&(c=c.offsetTop),function(a,b,c,f,d,e,h){function g(){0>f||1<f||0>=d?a.scrollTop=c:(a.scrollTop=b-(b-c)*h(f),f+=d*e,setTimeout(g,e))}g()}(a,b,c,0,1/e,20,d))};
function easeOutCuaic(t){
    t--;
    return t*t*t+1;
}

There is actually a pure javascript way to accomplish this without using setTimeout or requestAnimationFrame or jQuery.

In short, find the element in the scrollView that you want to scroll to, and use scrollIntoView

el.scrollIntoView({behavior:"smooth"});

Here is a plunkr.


Adapted from this answer:

function scroll(y, duration) {

    var initialY = document.documentElement.scrollTop || document.body.scrollTop;
    var baseY = (initialY + y) * 0.5;
    var difference = initialY - baseY;
    var startTime = performance.now();

    function step() {
        var normalizedTime = (performance.now() - startTime) / duration;
        if (normalizedTime > 1) normalizedTime = 1;

        window.scrollTo(0, baseY + difference * Math.cos(normalizedTime * Math.PI));
        if (normalizedTime < 1) window.requestAnimationFrame(step);
    }
    window.requestAnimationFrame(step);
}

This should allow you to smoothly scroll (cosine function) from anywhere to the specified "y".


No one mentioned the CSS property scroll-behavior

CSS

html {
  scroll-behavior: smooth;
}

JS

window.scrollTo(0,0)

PURE JAVASCRIPT SCROLLER CLASS

This is an old question but I thought I could answer with some fancy stuff and some more options to play with if you want to have a bit more control over the animation.

  • Cross-browser
  • Copy/Paste ready solution (You only need CSS and JS)
  • 3 animate modes: ["normal"|"linear"|false]
  • Customize your animation with available settings - make it snappy or fluent
  • Double click to skip animation
  • Every next single click adds initial speed
  • Stop scroll animation by draging down the scroll bar
  • Stop scroll animation by mouse wheel down
  • Animated button fade-in-out on scroll
  • Here it is a pure JS Class to take care of the scrolling for you:

    SEE DEMO AT CODEPEN OR GO TO THE BOTTOM AND RUN THE SINPET

    // ------------------- USE EXAMPLE ---------------------
    // *Set options
    var options = {
      'showButtonAfter': 200, // show button after scroling down this amount of px
      'animate': "linear", // [false|normal|linear] - for false no aditional settings are needed
    
      'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
        'steps': 20, // the more steps per loop the slower animation gets
        'ms': 10 // the less ms the quicker your animation gets
      }, 
      'linear': { // applys only if [animate: linear] - set scroll px|ms
        'px': 30, // the more px the quicker your animation gets
        'ms': 10 // the less ms the quicker your animation gets
      }, 
    };
    
    
    // *Create new Scroller and run it.
    var scroll = new Scroller(options);
    scroll.init();
    

    FULL CLASS SCRIPT + USE EXAMPLE:

    // PURE JAVASCRIPT (OOP)
    
    function Scroller(options) {
      this.options = options;
      this.button = null;
      this.stop = false;
    }
    
    Scroller.prototype.constructor = Scroller;
    
    Scroller.prototype.createButton = function() {
    
      this.button = document.createElement('button');
      this.button.classList.add('scroll-button');
      this.button.classList.add('scroll-button--hidden');
      this.button.textContent = "^";
      document.body.appendChild(this.button);
    }
    
    Scroller.prototype.init = function() {
      this.createButton();
      this.checkPosition();
      this.click();
      this.stopListener();
    }
    
    Scroller.prototype.scroll = function() {
      if (this.options.animate == false || this.options.animate == "false") {
        this.scrollNoAnimate();
        return;
      }
      if (this.options.animate == "normal") {
        this.scrollAnimate();
        return;
      }
      if (this.options.animate == "linear") {
        this.scrollAnimateLinear();
        return;
      }
    }
    Scroller.prototype.scrollNoAnimate = function() {
      document.body.scrollTop = 0;
      document.documentElement.scrollTop = 0;
    }
    Scroller.prototype.scrollAnimate = function() {
      if (this.scrollTop() > 0 && this.stop == false) {
        setTimeout(function() {
          this.scrollAnimate();
          window.scrollBy(0, (-Math.abs(this.scrollTop()) / this.options.normal['steps']));
        }.bind(this), (this.options.normal['ms']));
      }
    }
    Scroller.prototype.scrollAnimateLinear = function() {
      if (this.scrollTop() > 0 && this.stop == false) {
        setTimeout(function() {
          this.scrollAnimateLinear();
          window.scrollBy(0, -Math.abs(this.options.linear['px']));
        }.bind(this), this.options.linear['ms']);
      }
    }
    
    Scroller.prototype.click = function() {
    
      this.button.addEventListener("click", function(e) {
        e.stopPropagation();
        this.scroll();
      }.bind(this), false);
    
      this.button.addEventListener("dblclick", function(e) {
        e.stopPropagation();
        this.scrollNoAnimate();
      }.bind(this), false);
    
    }
    
    Scroller.prototype.hide = function() {
      this.button.classList.add("scroll-button--hidden");
    }
    
    Scroller.prototype.show = function() {
      this.button.classList.remove("scroll-button--hidden");
    }
    
    Scroller.prototype.checkPosition = function() {
      window.addEventListener("scroll", function(e) {
        if (this.scrollTop() > this.options.showButtonAfter) {
          this.show();
        } else {
          this.hide();
        }
      }.bind(this), false);
    }
    
    Scroller.prototype.stopListener = function() {
    
      // stop animation on slider drag
      var position = this.scrollTop();
      window.addEventListener("scroll", function(e) {
        if (this.scrollTop() > position) {
          this.stopTimeout(200);
        } else {
          //...
        }
        position = this.scrollTop();
      }.bind(this, position), false);
    
      // stop animation on wheel scroll down
      window.addEventListener("wheel", function(e) {
        if (e.deltaY > 0) this.stopTimeout(200);
      }.bind(this), false);
    }
    
    Scroller.prototype.stopTimeout = function(ms) {
      this.stop = true;
      // console.log(this.stop); //
      setTimeout(function() {
        this.stop = false;
        console.log(this.stop); //
      }.bind(this), ms);
    }
    
    Scroller.prototype.scrollTop = function() {
      var curentScrollTop = document.documentElement.scrollTop || document.body.scrollTop;
      return curentScrollTop;
    }
    
    
    
    // ------------------- USE EXAMPLE ---------------------
    // *Set options
    var options = {
      'showButtonAfter': 200, // show button after scroling down this amount of px
      'animate': "normal", // [false|normal|linear] - for false no aditional settings are needed
    
      'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
        'steps': 20, // the more steps per loop the slower animation gets
        'ms': 10 // the less ms the quicker your animation gets
      },
      'linear': { // applys only if [animate: linear] - set scroll px|ms
        'px': 30, // the more px the quicker your animation gets
        'ms': 10 // the less ms the quicker your animation gets
      },
    };
    // *Create new Scroller and run it.
    var scroll = new Scroller(options);
    scroll.init();
    /* CSS */
    
    @import url(https://fonts.googleapis.com/css?family=Open+Sans);
     body {
      font-family: 'Open Sans', sans-serif;
      font-size: 1.2rem;
      line-height: 2rem;
      height: 100%;
      position: relative;
      padding: 0 25%;
    }
    .scroll-button {
      font-size: 1.2rem;
      line-height: 2rem;
      padding: 10px;
      width: 50px;
      height: 50px;
      background: black;
      color: white;
      border-radius: 50%;
      position: fixed;
      right: 20px;
      bottom: 20px;
      visibility: visible;
      filter: alpha(opacity=50);
      filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=50);
      opacity: 0.5;
      cursor: pointer;
      transition: all 1.2s;
      -webkit-transition: all 1.2s;
      -moz-transition: all 1.2s;
      -ms-transition: all 1.2s;
      -o-transition: all 1.2s;
    }
    .scroll-button:hover {
      filter: alpha(opacity=100);
      filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=100);
      opacity: 1;
    }
    .scroll-button--hidden {
      filter: alpha(opacity=0);
      filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=0);
      opacity: 0;
      visibility: hidden;
    }
    <!-- HTML -->
    
    <h1>Scroll down by 200px for button to appear</h1>
    <ul>
      <li>Cross-browser</li>
      <li>Copy/Paste solution</li>
      <li>3 animate modes: <b>["normal"|"linear"|false]</b></li>
      <li>Customize your aniamtion with aveilable settings - make it snapy or fluent</li>
      <li>Double click to skip animation</li>
      <li>Every next single click adds initial speed</li>
      <li>Stop scroll animation by draging down the scroll bar</li>
      <li>Stop scroll animation by mouse wheel down</li>
      <li>Animated button fade-in-out on scroll</li>
    </ul>
    
    <br />
    <br />
    <pre>
    // ------------------- USE EXAMPLE ---------------------
    // *Set options
    var options = {
      'showButtonAfter': 200, // show button after scroling down this amount of px
      'animate': "normal", // [false|normal|linear] - for false no aditional settings are needed
      
      'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
        'steps': 20, // the more steps the slower animation gets
        'ms': 20 // the less ms the quicker your animation gets
      }, 
      'linear': { // applys only if [animate: linear] - set scroll px|ms
        'px': 55, // the more px the quicker your animation gets
        'ms': 10 // the less ms the quicker your animation gets
      }, 
    };
    
    // *Create new Scroller and run it.
    var scroll = new Scroller(options);
    scroll.init();
    </pre>
    <br />
    <br />
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    Easy.

    var scrollIt = function(time) {
        // time = scroll time in ms
        var start = new Date().getTime(),
            scroll = document.documentElement.scrollTop + document.body.scrollTop,
            timer = setInterval(function() {
                var now = Math.min(time,(new Date().getTime())-start)/time;
                document.documentElement.scrollTop
                    = document.body.scrollTop = (1-time)/start*scroll;
                if( now == 1) clearTimeout(timer);
            },25);
    }
    

    Just made this javascript only solution below.

    Simple usage:

    EPPZScrollTo.scrollVerticalToElementById('wrapper', 0);
    

    Engine object (you can fiddle with filter, fps values):

    /**
     *
     * Created by Borbás Geri on 12/17/13
     * Copyright (c) 2013 eppz! development, LLC.
     *
     * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
     * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     *
     */
    
    
    var EPPZScrollTo =
    {
        /**
         * Helpers.
         */
        documentVerticalScrollPosition: function()
        {
            if (self.pageYOffset) return self.pageYOffset; // Firefox, Chrome, Opera, Safari.
            if (document.documentElement && document.documentElement.scrollTop) return document.documentElement.scrollTop; // Internet Explorer 6 (standards mode).
            if (document.body.scrollTop) return document.body.scrollTop; // Internet Explorer 6, 7 and 8.
            return 0; // None of the above.
        },
    
        viewportHeight: function()
        { return (document.compatMode === "CSS1Compat") ? document.documentElement.clientHeight : document.body.clientHeight; },
    
        documentHeight: function()
        { return (document.height !== undefined) ? document.height : document.body.offsetHeight; },
    
        documentMaximumScrollPosition: function()
        { return this.documentHeight() - this.viewportHeight(); },
    
        elementVerticalClientPositionById: function(id)
        {
            var element = document.getElementById(id);
            var rectangle = element.getBoundingClientRect();
            return rectangle.top;
        },
    
        /**
         * Animation tick.
         */
        scrollVerticalTickToPosition: function(currentPosition, targetPosition)
        {
            var filter = 0.2;
            var fps = 60;
            var difference = parseFloat(targetPosition) - parseFloat(currentPosition);
    
            // Snap, then stop if arrived.
            var arrived = (Math.abs(difference) <= 0.5);
            if (arrived)
            {
                // Apply target.
                scrollTo(0.0, targetPosition);
                return;
            }
    
            // Filtered position.
            currentPosition = (parseFloat(currentPosition) * (1.0 - filter)) + (parseFloat(targetPosition) * filter);
    
            // Apply target.
            scrollTo(0.0, Math.round(currentPosition));
    
            // Schedule next tick.
            setTimeout("EPPZScrollTo.scrollVerticalTickToPosition("+currentPosition+", "+targetPosition+")", (1000 / fps));
        },
    
        /**
         * For public use.
         *
         * @param id The id of the element to scroll to.
         * @param padding Top padding to apply above element.
         */
        scrollVerticalToElementById: function(id, padding)
        {
            var element = document.getElementById(id);
            if (element == null)
            {
                console.warn('Cannot find element with id \''+id+'\'.');
                return;
            }
    
            var targetPosition = this.documentVerticalScrollPosition() + this.elementVerticalClientPositionById(id) - padding;
            var currentPosition = this.documentVerticalScrollPosition();
    
            // Clamp.
            var maximumScrollPosition = this.documentMaximumScrollPosition();
            if (targetPosition > maximumScrollPosition) targetPosition = maximumScrollPosition;
    
            // Start animation.
            this.scrollVerticalTickToPosition(currentPosition, targetPosition);
        }
    };
    

    Building on some of the answers here, but using some simple math for a smooth transition using a sine curve:

    scrollTo(element, from, to, duration, currentTime) {
           if (from <= 0) { from = 0;}
           if (to <= 0) { to = 0;}
           if (currentTime>=duration) return;
           let delta = to-from;
           let progress = currentTime / duration * Math.PI / 2;
           let position = delta * (Math.sin(progress));
           setTimeout(() => {
               element.scrollTop = from + position;
               this.scrollTo(element, from, to, duration, currentTime + 10);
           }, 10);
       }
    

    Usage:

    // Smoothly scroll from current position to new position in 1/2 second.
    scrollTo(element, element.scrollTop, element.scrollTop + 400, 500, 0);
    

    PS. take note of ES6 style


    This is a cross browser approach based on answers above

    function scrollTo(to, duration) {
        if (duration < 0) return;
        var scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
        var difference = to - scrollTop;
        var perTick = difference / duration * 10;
    
        setTimeout(function() {
          scrollTop = scrollTop + perTick;
          document.body.scrollTop = scrollTop;
          document.documentElement.scrollTop = scrollTop;
          if (scrollTop === to) return;
          scrollTo(to, duration - 10);
        }, 10);
      }
    

    Yet another approach is using window.scrollBy

    JSFiddle

    function scroll(pxPerFrame, duration) {
            if (!pxPerFrame || !duration) return;
            const end = new Date().getTime() + duration;
            step(); 
    
            function step() {
              window.scrollBy(0, pxPerFrame);
              if (new Date().getTime() < end) {
                window.setTimeout(step, 1000 / 60);
              } else {
                console.log('done scrolling'); 
              }
            }
          }
    body {
      width: 200px;
    }
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>
    <button onclick="scroll(-5, 3000)">
    scroll(-5, 3000)
    </button>
    </p>


    I have choose @akai version of @timwolla answer and added stopAnimation function in return, so before starting new animation, the old one can be stopped.

    if ( this.stopAnimation )
        this.stopAnimation()
    
        this.stopAnimation = scrollTo( el, scrollDestination, 300 )
    
    
    // definitions
    
    function scrollTo(element, to, duration) {
        var start = element.scrollTop,
            change = to - start,
            increment = 20,
            timeOut;
    
        var animateScroll = function(elapsedTime) {        
            elapsedTime += increment;
            var position = easeInOut(elapsedTime, start, change, duration);                        
            element.scrollTop = position; 
            if (elapsedTime < duration) {
                timeOut = setTimeout(function() {
                    animateScroll(elapsedTime);
                }, increment);
            }
        };
    
        animateScroll(0);
    
        return stopAnimation
    
        function stopAnimation() {
            clearTimeout( timeOut )
        }
    }
    
    function easeInOut(currentTime, start, change, duration) {
        currentTime /= duration / 2;
        if (currentTime < 1) {
            return change / 2 * currentTime * currentTime + start;
        }
        currentTime -= 1;
        return -change / 2 * (currentTime * (currentTime - 2) - 1) + start;
    }
    

    Another cross-browser approach based on above solution

    function doScrollTo(to, duration) {
        var element = document.documentElement;
    
            var start = element.scrollTop,
            change = to - start,
            increment = 20,
            i = 0;
    
        var animateScroll = function(elapsedTime) {
            elapsedTime += increment;
            var position = easeInOut(elapsedTime, start, change, duration);
            if (i === 1 && window.scrollY === start) {
                element = document.body;
                start = element.scrollTop;
            }
            element.scrollTop = position;
            if (!i) i++;
            if (elapsedTime < duration) {
                setTimeout(function() {
                    animateScroll(elapsedTime);
                }, increment);
            }
        };
    
        animateScroll(0);
    }
    

    The trick is to control the actual scroll change, and if it is zero, change the scroll element.


    Linear scrolling animation to bottom. Pure JS, no JQuery. Maybe my solution will be helpful for someone.

    let action_count = 8;
    let speed_ms = 15;
    let objDiv = document.getElementsByClassName('js_y5_area3').item(0);
    
    let scroll_height = objDiv.scrollHeight;
    let window_height = objDiv.offsetHeight;
    
    let scroll_top = objDiv.scrollTop;
    let need_scroll_top = scroll_height - window_height;
    
    if (scroll_top < need_scroll_top)
    {
        let step = Math.ceil((need_scroll_top - scroll_top) / action_count);
    
        let scrollInterval = setInterval(function()
        {
            scroll_top += step;
            objDiv.scrollTop = scroll_top;
    
            if (scroll_top >= need_scroll_top)
            {
                clearInterval(scrollInterval);
            }
    
        }, speed_ms);
    }
    

    You can change variables action_count, speed_ms to configure scrolling animation on your taste.


    Use this solution

    animate(document.documentElement, 'scrollTop', 0, 200);
    

    Thanks


    I see that most/all of the above posts search for a button with javascript. This works, as long as you have only one button. I would recommend defining an "onclick" element inside the button. That "onclick" would then call the function causing it to scroll.

    If you do it like that, you can use more than one button, as long as the button looks something like this:

    <button onclick="scrollTo(document.body, 0, 1250)">To the top</button>