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Как сделать плавную прокрутку страницы при скролинге

2015-12-15 / Вр:00:48 / просмотров: 8659

На одном сайте заказчика я использовал паралакс, но, делая прокрутку колесиком мышки, страница прокручивалась рывками и эффекта паралакса не было видно. После установки скрипта для плавной прокрутки страницы сайт приобрел более профессиональный вид и эффект «параллакс» сразу стал заметен.
Итак, создайте файл «scrolling-scroll.js» и вставьте вот такой скрипт:

(function () {
// Scroll Variables (tweakable)
var defaultOptions = {

// Scrolling Core
frameRate : 150, // [Hz]
animationTime : 1500, // [ms]
stepSize : 150, // [px]

// Pulse (less tweakable)
// ratio of "tail" to "acceleration"
pulseAlgorithm : true,
pulseScale : 5,
pulseNormalize : 1,

// Acceleration
accelerationDelta : 100, // 20
accelerationMax : 1, // 1

// Keyboard Settings
keyboardSupport : true, // option
arrowScroll : 50, // [px]

// Other
touchpadSupport : false, // ignore touchpad by default
fixedBackground : true,
excluded : ''
};

var options = defaultOptions;
// Other Variables
var isExcluded = false;
var isFrame = false;
var direction = { x: 0, y: 0 };
var initDone = false;
var root = document.documentElement;
var activeElement;
var observer;
var refreshSize;
var deltaBuffer = [];
var isMac = /^Mac/.test(navigator.platform);

var key = { left: 37, up: 38, right: 39, down: 40, spacebar: 32,
pageup: 33, pagedown: 34, end: 35, home: 36 };
/***********************************************
* INITIALIZE
***********************************************/

/**
* Tests if smooth scrolling is allowed. Shuts down everything if not.
*/
function initTest() {
if (options.keyboardSupport) {
addEvent('keydown', keydown);
}
}

/**
* Sets up scrolls array, determines if frames are involved.
*/
function init() {

if (initDone || !document.body) return;

initDone = true;

var body = document.body;
var html = document.documentElement;
var windowHeight = window.innerHeight;
var scrollHeight = body.scrollHeight;

// check compat mode for root element
root = (document.compatMode.indexOf('CSS') >= 0) ? html : body;
activeElement = body;

initTest();

// Checks if this script is running in a frame
if (top != self) {
isFrame = true;
}

/**
* Please duplicate this radar for a Safari fix!
* rdar://22376037
* https://openradar.appspot.com/radar?id=4965070979203072
*
* Only applies to Safari now, Chrome fixed it in v45:
* This fixes a bug where the areas left and right to
* the content does not trigger the onmousewheel event
* on some pages. e.g.: html, body { height: 100% }
*/
else if (scrollHeight > windowHeight &&
(body.offsetHeight <= windowHeight ||
html.offsetHeight <= windowHeight)) {

var fullPageElem = document.createElement('div');
fullPageElem.style.cssText = 'position:absolute; z-index:-10000; ' +
'top:0; left:0; right:0; height:' +
root.scrollHeight + 'px';
document.body.appendChild(fullPageElem);

// DOM changed (throttled) to fix height
var pendingRefresh;
refreshSize = function () {
if (pendingRefresh) return; // could also be: clearTimeout(pendingRefresh);
pendingRefresh = setTimeout(function () {
if (isExcluded) return; // could be running after cleanup
fullPageElem.style.height = '0';
fullPageElem.style.height = root.scrollHeight + 'px';
pendingRefresh = null;
}, 500); // act rarely to stay fast
};

setTimeout(refreshSize, 10);

addEvent('resize', refreshSize);

// TODO: attributeFilter?
var config = {
attributes: true,
childList: true,
characterData: false
// subtree: true
};

observer = new MutationObserver(refreshSize);
observer.observe(body, config);

if (root.offsetHeight <= windowHeight) {
var clearfix = document.createElement('div');
clearfix.style.clear = 'both';
body.appendChild(clearfix);
}
}

// disable fixed background
if (!options.fixedBackground && !isExcluded) {
body.style.backgroundAttachment = 'scroll';
html.style.backgroundAttachment = 'scroll';
}
}

/**
* Removes event listeners and other traces left on the page.
*/
function cleanup() {
observer && observer.disconnect();
removeEvent(wheelEvent, wheel);
removeEvent('mousedown', mousedown);
removeEvent('keydown', keydown);
removeEvent('resize', refreshSize);
removeEvent('load', init);
}
/************************************************
* SCROLLING
************************************************/

var que = [];
var pending = false;
var lastScroll = Date.now();

/**
* Pushes scroll actions to the scrolling queue.
*/
function scrollArray(elem, left, top) {

directionCheck(left, top);

if (options.accelerationMax != 1) {
var now = Date.now();
var elapsed = now - lastScroll;
if (elapsed < options.accelerationDelta) {
var factor = (1 + (50 / elapsed)) / 2;
if (factor > 1) {
factor = Math.min(factor, options.accelerationMax);
left *= factor;
top *= factor;
}
}
lastScroll = Date.now();
}

// push a scroll command
que.push({
x: left,
y: top,
lastX: (left < 0) ? 0.99 : -0.99,
lastY: (top < 0) ? 0.99 : -0.99,
start: Date.now()
});

// don't act if there's a pending queue
if (pending) {
return;
}

var scrollWindow = (elem === document.body);

var step = function (time) {

var now = Date.now();
var scrollX = 0;
var scrollY = 0;

for (var i = 0; i < que.length; i++) {

var item = que[i];
var elapsed = now - item.start;
var finished = (elapsed >= options.animationTime);

// scroll position: [0, 1]
var position = (finished) ? 1 : elapsed / options.animationTime;

// easing [optional]
if (options.pulseAlgorithm) {
position = pulse(position);
}

// only need the difference
var x = (item.x * position - item.lastX) >> 0;
var y = (item.y * position - item.lastY) >> 0;

// add this to the total scrolling
scrollX += x;
scrollY += y;

// update last values
item.lastX += x;
item.lastY += y;

// delete and step back if it's over
if (finished) {
que.splice(i, 1); i--;
}
}

// scroll left and top
if (scrollWindow) {
window.scrollBy(scrollX, scrollY);
}
else {
if (scrollX) elem.scrollLeft += scrollX;
if (scrollY) elem.scrollTop += scrollY;
}

// clean up if there's nothing left to do
if (!left && !top) {
que = [];
}

if (que.length) {
requestFrame(step, elem, (1000 / options.frameRate + 1));
} else {
pending = false;
}
};

// start a new queue of actions
requestFrame(step, elem, 0);
pending = true;
}
/***********************************************
* EVENTS
***********************************************/

/**
* Mouse wheel handler.
* @param {Object} event
*/
function wheel(event) {

if (!initDone) {
init();
}

var target = event.target;
var overflowing = overflowingAncestor(target);

// use default if there's no overflowing
// element or default action is prevented
// or it's a zooming event with CTRL
if (!overflowing || event.defaultPrevented || event.ctrlKey) {
return true;
}

// leave embedded content alone (flash & pdf)
if (isNodeName(activeElement, 'embed') ||
(isNodeName(target, 'embed') && /\.pdf/i.test(target.src)) ||
isNodeName(activeElement, 'object')) {
return true;
}

var deltaX = -event.wheelDeltaX || event.deltaX || 0;
var deltaY = -event.wheelDeltaY || event.deltaY || 0;

if (isMac) {
if (event.wheelDeltaX && isDivisible(event.wheelDeltaX, 120)) {
deltaX = -120 * (event.wheelDeltaX / Math.abs(event.wheelDeltaX));
}
if (event.wheelDeltaY && isDivisible(event.wheelDeltaY, 120)) {
deltaY = -120 * (event.wheelDeltaY / Math.abs(event.wheelDeltaY));
}
}

// use wheelDelta if deltaX/Y is not available
if (!deltaX && !deltaY) {
deltaY = -event.wheelDelta || 0;
}

// line based scrolling (Firefox mostly)
if (event.deltaMode === 1) {
deltaX *= 40;
deltaY *= 40;
}

// check if it's a touchpad scroll that should be ignored
if (!options.touchpadSupport && isTouchpad(deltaY)) {
return true;
}

// scale by step size
// delta is 120 most of the time
// synaptics seems to send 1 sometimes
if (Math.abs(deltaX) > 1.2) {
deltaX *= options.stepSize / 120;
}
if (Math.abs(deltaY) > 1.2) {
deltaY *= options.stepSize / 120;
}

scrollArray(overflowing, deltaX, deltaY);
event.preventDefault();
scheduleClearCache();
}

/**
* Keydown event handler.
* @param {Object} event
*/
function keydown(event) {

var target = event.target;
var modifier = event.ctrlKey || event.altKey || event.metaKey ||
(event.shiftKey && event.keyCode !== key.spacebar);

// our own tracked active element could've been removed from the DOM
if (!document.contains(activeElement)) {
activeElement = document.activeElement;
}

// do nothing if user is editing text
// or using a modifier key (except shift)
// or in a dropdown
// or inside interactive elements
var inputNodeNames = /^(textarea|select|embed|object)$/i;
var buttonTypes = /^(button|submit|radio|checkbox|file|color|image)$/i;
if ( inputNodeNames.test(target.nodeName) ||
isNodeName(target, 'input') && !buttonTypes.test(target.type) ||
isNodeName(activeElement, 'video') ||
isInsideYoutubeVideo(event) ||
target.isContentEditable ||
event.defaultPrevented ||
modifier ) {
return true;
}

// spacebar should trigger button press
if ((isNodeName(target, 'button') ||
isNodeName(target, 'input') && buttonTypes.test(target.type)) &&
event.keyCode === key.spacebar) {
return true;
}

var shift, x = 0, y = 0;
var elem = overflowingAncestor(activeElement);
var clientHeight = elem.clientHeight;

if (elem == document.body) {
clientHeight = window.innerHeight;
}

switch (event.keyCode) {
case key.up:
y = -options.arrowScroll;
break;
case key.down:
y = options.arrowScroll;
break;
case key.spacebar: // (+ shift)
shift = event.shiftKey ? 1 : -1;
y = -shift * clientHeight * 0.9;
break;
case key.pageup:
y = -clientHeight * 0.9;
break;
case key.pagedown:
y = clientHeight * 0.9;
break;
case key.home:
y = -elem.scrollTop;
break;
case key.end:
var damt = elem.scrollHeight - elem.scrollTop - clientHeight;
y = (damt > 0) ? damt+10 : 0;
break;
case key.left:
x = -options.arrowScroll;
break;
case key.right:
x = options.arrowScroll;
break;
default:
return true; // a key we don't care about
}

scrollArray(elem, x, y);
event.preventDefault();
scheduleClearCache();
}

/**
* Mousedown event only for updating activeElement
*/
function mousedown(event) {
activeElement = event.target;
}
/***********************************************
* OVERFLOW
***********************************************/

var uniqueID = (function () {
var i = 0;
return function (el) {
return el.uniqueID || (el.uniqueID = i++);
};
})();

var cache = {}; // cleared out after a scrolling session
var clearCacheTimer;

//setInterval(function () { cache = {}; }, 10 * 1000);

function scheduleClearCache() {
clearTimeout(clearCacheTimer);
clearCacheTimer = setInterval(function () { cache = {}; }, 1*1000);
}

function setCache(elems, overflowing) {
for (var i = elems.length; i--;)
cache[uniqueID(elems[i])] = overflowing;
return overflowing;
}

// (body) (root)
// | hidden | visible | scroll | auto |
// hidden | no | no | YES | YES |
// visible | no | YES | YES | YES |
// scroll | no | YES | YES | YES |
// auto | no | YES | YES | YES |

function overflowingAncestor(el) {
var elems = [];
var body = document.body;
var rootScrollHeight = root.scrollHeight;
do {
var cached = cache[uniqueID(el)];
if (cached) {
return setCache(elems, cached);
}
elems.push(el);
if (rootScrollHeight === el.scrollHeight) {
var topOverflowsNotHidden = overflowNotHidden(root) && overflowNotHidden(body);
var isOverflowCSS = topOverflowsNotHidden || overflowAutoOrScroll(root);
if (isFrame && isContentOverflowing(root) ||
!isFrame && isOverflowCSS) {
return setCache(elems, getScrollRoot());
}
} else if (isContentOverflowing(el) && overflowAutoOrScroll(el)) {
return setCache(elems, el);
}
} while (el = el.parentElement);
}

function isContentOverflowing(el) {
return (el.clientHeight + 10 < el.scrollHeight);
}

// typically for <body> and <html>
function overflowNotHidden(el) {
var overflow = getComputedStyle(el, '').getPropertyValue('overflow-y');
return (overflow !== 'hidden');
}

// for all other elements
function overflowAutoOrScroll(el) {
var overflow = getComputedStyle(el, '').getPropertyValue('overflow-y');
return (overflow === 'scroll' || overflow === 'auto');
}
/***********************************************
* HELPERS
***********************************************/

function addEvent(type, fn) {
window.addEventListener(type, fn, false);
}

function removeEvent(type, fn) {
window.removeEventListener(type, fn, false);
}

function isNodeName(el, tag) {
return (el.nodeName||'').toLowerCase() === tag.toLowerCase();
}

function directionCheck(x, y) {
x = (x > 0) ? 1 : -1;
y = (y > 0) ? 1 : -1;
if (direction.x !== x || direction.y !== y) {
direction.x = x;
direction.y = y;
que = [];
lastScroll = 0;
}
}

var deltaBufferTimer;

if (window.localStorage && localStorage.SS_deltaBuffer) {
deltaBuffer = localStorage.SS_deltaBuffer.split(',');
}

function isTouchpad(deltaY) {
if (!deltaY) return;
if (!deltaBuffer.length) {
deltaBuffer = [deltaY, deltaY, deltaY];
}
deltaY = Math.abs(deltaY)
deltaBuffer.push(deltaY);
deltaBuffer.shift();
clearTimeout(deltaBufferTimer);
deltaBufferTimer = setTimeout(function () {
if (window.localStorage) {
localStorage.SS_deltaBuffer = deltaBuffer.join(',');
}
}, 1000);
return !allDeltasDivisableBy(120) && !allDeltasDivisableBy(100);
}

function isDivisible(n, divisor) {
return (Math.floor(n / divisor) == n / divisor);
}

function allDeltasDivisableBy(divisor) {
return (isDivisible(deltaBuffer[0], divisor) &&
isDivisible(deltaBuffer[1], divisor) &&
isDivisible(deltaBuffer[2], divisor));
}

function isInsideYoutubeVideo(event) {
var elem = event.target;
var isControl = false;
if (document.URL.indexOf ('www.youtube.com/watch') != -1) {
do {
isControl = (elem.classList &&
elem.classList.contains('html5-video-controls'));
if (isControl) break;
} while (elem = elem.parentNode);
}
return isControl;
}

var requestFrame = (function () {
return (window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function (callback, element, delay) {
window.setTimeout(callback, delay || (1000/60));
});
})();

var MutationObserver = (window.MutationObserver ||
window.WebKitMutationObserver ||
window.MozMutationObserver);

var getScrollRoot = (function() {
var SCROLL_ROOT;
return function() {
if (!SCROLL_ROOT) {
var dummy = document.createElement('div');
dummy.style.cssText = 'height:10000px;width:1px;';
document.body.appendChild(dummy);
var bodyScrollTop = document.body.scrollTop;
var docElScrollTop = document.documentElement.scrollTop;
window.scrollBy(0, 3);
if (document.body.scrollTop != bodyScrollTop)
(SCROLL_ROOT = document.body);
else
(SCROLL_ROOT = document.documentElement);
window.scrollBy(0, -3);
document.body.removeChild(dummy);
}
return SCROLL_ROOT;
};
})();
/***********************************************
* PULSE (by Michael Herf)
***********************************************/

/**
* Viscous fluid with a pulse for part and decay for the rest.
* - Applies a fixed force over an interval (a damped acceleration), and
* - Lets the exponential bleed away the velocity over a longer interval
* - Michael Herf, https://stereopsis.com/stopping/
*/
function pulse_(x) {
var val, start, expx;
// test
x = x * options.pulseScale;
if (x < 1) { // acceleartion
val = x - (1 - Math.exp(-x));
} else { // tail
// the previous animation ended here:
start = Math.exp(-1);
// simple viscous drag
x -= 1;
expx = 1 - Math.exp(-x);
val = start + (expx * (1 - start));
}
return val * options.pulseNormalize;
}

function pulse(x) {
if (x >= 1) return 1;
if (x <= 0) return 0;

if (options.pulseNormalize == 1) {
options.pulseNormalize /= pulse_(1);
}
return pulse_(x);
}
/***********************************************
* FIRST RUN
***********************************************/

var userAgent = window.navigator.userAgent;
var isEdge = /Edge/.test(userAgent); // thank you MS
var isChrome = /chrome/i.test(userAgent) && !isEdge;
var isSafari = /safari/i.test(userAgent) && !isEdge;
var isMobile = /mobile/i.test(userAgent);
var isEnabledForBrowser = (isChrome || isSafari) && !isMobile;

var wheelEvent;
if ('onwheel' in document.createElement('div'))
wheelEvent = 'wheel';
else if ('onmousewheel' in document.createElement('div'))
wheelEvent = 'mousewheel';

if (wheelEvent && isEnabledForBrowser) {
addEvent(wheelEvent, wheel);
addEvent('mousedown', mousedown);
addEvent('load', init);
}
/***********************************************
* PUBLIC INTERFACE
***********************************************/

function SmoothScroll(optionsToSet) {
for (var key in optionsToSet)
if (defaultOptions.hasOwnProperty(key))
options[key] = optionsToSet[key];
}
SmoothScroll.destroy = cleanup;

if (window.SmoothScrollOptions) // async API
SmoothScroll(window.SmoothScrollOptions)

if (typeof define === 'function' && define.amd)
define(function() {
return SmoothScroll;
});
else if ('object' == typeof exports)
module.exports = SmoothScroll;
else
window.SmoothScroll = SmoothScroll;

})();

Теперь добавьте перед </head> вот такой код:

<script src="scrolling-scroll.js"></script>

Файл «scrolling-scroll.js» должен находиться со всеми файлами сайта (корень сайта).

Если вы используете WordPress, тогда в файле «header.php» между тегами <head></head> вставьте вот такой код:

<script src="<?php bloginfo('template_url'); ?>/scrolling-scroll.js "></script>

Файл «scrolling-scroll.js» должен находиться со всеми файлами темы.

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