跨浏览器JavaScript（不是jQuery …）滚动到顶部的animation
我正在寻找一个简单的，可以应用于链接的跨浏览器的“滚动到顶部”animation。 我不想要一个JS库，如jQuery / Moo等
// jQuery Equivilant to convert to pure JS... $('html, body').animate({scrollTop:0}, 400); 对于在跳入图书馆之前应该学习JS的人来说，我是一个完美的例子。 🙁
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); }
演示：
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. 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. 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. 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. 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. 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. </p> <button id=scrollme type="button">To the top</button>
看起来已经有很多解决scheme了。 无论如何，这里是另一个，使用缓和方程。
// 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');
我修改了TimWolla的答案，使用二次input缓冲（稍微平滑:)。 下面是一个例子： jsFiddle 。 放松function可在这里： 罗伯特·潘纳的舒缓function
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; }
没有JQuery代码，希望这会帮助你。
function TopscrollTo() { if(window.scrollY!=0) { setTimeout(function() { window.scrollTo(0,window.scrollY-30); TopscrollTo(); }, 100); } }
调用这个TopscrollTo（）函数上的button点击事件或任何其他元素/事件，你想要的。
我修改了@TimWolla的代码来添加更多选项和一些移动function。 另外，还增加了对document.body.scrollTop和document.documentElement.scrollTop的交叉浏览器的支持
// 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/
缩小版本： 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-(bc)*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; }
window.scroll({top: 0, left: 0, behavior: 'smooth' });
从关于平滑滚动的文章中得到它。
如果需要的话，有一些polyfills可用。
简单。
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); }
纯JAVASCRIPT滚动类
这是一个古老的问题，但我想我可以回答一些花哨的东西，还有更多的select，如果你想对animation有更多的控制权。
这里是一个纯粹的JS类来照顾你的滚动：
在代码中查看演示，或转到底部并运行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();
全class级脚本+使用示例：
// 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 /> <p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. 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Suscipit, assumenda, harum.</span></p> <p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odit, nihil tenetur tempore eligendi qui nesciunt consequatur delectus accusantium consectetur ipsa, nulla doloribus dolores rerum corporis, laborum, laboriosam hic mollitia repellat.</span><span>Ab deleniti vitae blanditiis quod tenetur! Voluptatem temporibus ab eaque quis? Quis odio aliquid harum temporibus totam, ipsa eius iusto fugiat enim in, quibusdam molestiae aliquam consequatur nulla, consequuntur sint.</span></p> <p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum odit praesentium quos, earum nesciunt laudantium illo tempora eligendi, porro doloremque mollitia neque aperiam inventore nam maxime dolor labore aspernatur molestias.</span><span>Voluptatibus provident hic cupiditate placeat, ut reprehenderit nisi eum, dolores ad sed quis. 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Consectetur aliquam provident voluptatibus saepe repudiandae eveniet laborum beatae, animi, voluptate dolores.</span></p> <p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque magni, eum ipsa, veritatis facere voluptatem dolorum nobis neque minus debitis asperiores iste. Pariatur sequi quam, tempora. Dignissimos, esse similique tempora.</span><span>Ex delectus excepturi autem sunt, nemo repudiandae, recusandae nostrum accusantium nobis temporibus magnam eligendi similique veritatis deleniti, eaque blanditiis possimus at! Repellat alias laboriosam ipsum commodi dolorem, corporis dolore suscipit!</span></p>
Just made this javascript only solution below.
简单的用法：
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); }
用法：
// 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
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".
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
的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.
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>
