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- /*!
- * Name : Just Another Parallax [Jarallax]
- * Version : 1.7.2
- * Author : _nK https://nkdev.info
- * GitHub : https://github.com/nk-o/jarallax
- */
- (function (window) {
- 'use strict';
- // Adapted from https://gist.github.com/paulirish/1579671
- if(!Date.now) {
- Date.now = function () { return new Date().getTime(); };
- }
- if(!window.requestAnimationFrame) {
- (function () {
- var vendors = ['webkit', 'moz'];
- for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
- var vp = vendors[i];
- window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];
- window.cancelAnimationFrame = window[vp+'CancelAnimationFrame']
- || window[vp+'CancelRequestAnimationFrame'];
- }
- if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
- || !window.requestAnimationFrame || !window.cancelAnimationFrame) {
- var lastTime = 0;
- window.requestAnimationFrame = function (callback) {
- var now = Date.now();
- var nextTime = Math.max(lastTime + 16, now);
- return setTimeout(function () { callback(lastTime = nextTime); },
- nextTime - now);
- };
- window.cancelAnimationFrame = clearTimeout;
- }
- }());
- }
- var supportTransform = (function () {
- if (!window.getComputedStyle) {
- return false;
- }
- var el = document.createElement('p'),
- has3d,
- transforms = {
- 'webkitTransform':'-webkit-transform',
- 'OTransform':'-o-transform',
- 'msTransform':'-ms-transform',
- 'MozTransform':'-moz-transform',
- 'transform':'transform'
- };
- // Add it to the body to get the computed style.
- (document.body || document.documentElement).insertBefore(el, null);
- for (var t in transforms) {
- if (typeof el.style[t] !== 'undefined') {
- el.style[t] = "translate3d(1px,1px,1px)";
- has3d = window.getComputedStyle(el).getPropertyValue(transforms[t]);
- }
- }
- (document.body || document.documentElement).removeChild(el);
- return typeof has3d !== 'undefined' && has3d.length > 0 && has3d !== "none";
- }());
- var isAndroid = navigator.userAgent.toLowerCase().indexOf('android') > -1;
- var isIOs = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
- var isOperaOld = !!window.opera;
- var isEdge = /Edge\/\d+/.test(navigator.userAgent);
- var isIE11 = /Trident.*rv[ :]*11\./.test(navigator.userAgent);
- var isIE10 = !!Function('/*@cc_on return document.documentMode===10@*/')();
- var isIElt10 = document.all && !window.atob;
- var wndW;
- var wndH;
- function updateWndVars () {
- wndW = window.innerWidth || document.documentElement.clientWidth;
- wndH = window.innerHeight || document.documentElement.clientHeight;
- }
- updateWndVars();
- // list with all jarallax instances
- // need to render all in one scroll/resize event
- var jarallaxList = [];
- // Jarallax instance
- var Jarallax = (function () {
- var instanceID = 0;
- function Jarallax_inner (item, userOptions) {
- var _this = this,
- dataOptions;
- _this.$item = item;
- _this.defaults = {
- type : 'scroll', // type of parallax: scroll, scale, opacity, scale-opacity, scroll-opacity
- speed : 0.5, // supported value from -1 to 2
- imgSrc : null,
- imgWidth : null,
- imgHeight : null,
- enableTransform : true,
- elementInViewport : null,
- zIndex : -100,
- noAndroid : false,
- noIos : true,
- // events
- onScroll : null, // function(calculations) {}
- onInit : null, // function() {}
- onDestroy : null, // function() {}
- onCoverImage : null // function() {}
- };
- dataOptions = JSON.parse(_this.$item.getAttribute('data-jarallax') || '{}');
- _this.options = _this.extend({}, _this.defaults, dataOptions, userOptions);
- // stop init if android or ios
- if(isAndroid && _this.options.noAndroid || isIOs && _this.options.noIos) {
- return;
- }
- // fix speed option [-1.0, 2.0]
- _this.options.speed = Math.min(2, Math.max(-1, parseFloat(_this.options.speed)));
- // custom element to check if parallax in viewport
- var elementInVP = _this.options.elementInViewport;
- // get first item from array
- if(elementInVP && typeof elementInVP === 'object' && typeof elementInVP.length !== 'undefined') {
- elementInVP = elementInVP[0];
- }
- // check if dom element
- if(!elementInVP instanceof Element) {
- elementInVP = null;
- }
- _this.options.elementInViewport = elementInVP;
- _this.instanceID = instanceID++;
- _this.image = {
- src : _this.options.imgSrc || null,
- $container : null,
- $item : null,
- width : _this.options.imgWidth || null,
- height : _this.options.imgHeight || null,
- // fix for some devices
- // use <img> instead of background image - more smoothly
- useImgTag : isIOs || isAndroid || isOperaOld || isIE11 || isIE10 || isEdge
- };
- if(_this.initImg()) {
- _this.init();
- }
- }
- return Jarallax_inner;
- }());
- // add styles to element
- Jarallax.prototype.css = function (el, styles) {
- if(typeof styles === 'string') {
- if(window.getComputedStyle) {
- return window.getComputedStyle(el).getPropertyValue(styles);
- }
- return el.style[styles];
- }
- // add transform property with vendor prefixes
- if(styles.transform) {
- styles.WebkitTransform = styles.MozTransform = styles.transform;
- }
- for(var k in styles) {
- el.style[k] = styles[k];
- }
- return el;
- };
- // Extend like jQuery.extend
- Jarallax.prototype.extend = function (out) {
- out = out || {};
- for (var i = 1; i < arguments.length; i++) {
- if (!arguments[i]) {
- continue;
- }
- for (var key in arguments[i]) {
- if (arguments[i].hasOwnProperty(key)) {
- out[key] = arguments[i][key];
- }
- }
- }
- return out;
- };
- // Jarallax functions
- Jarallax.prototype.initImg = function () {
- var _this = this;
- // get image src
- if(_this.image.src === null) {
- _this.image.src = _this.css(_this.$item, 'background-image').replace(/^url\(['"]?/g,'').replace(/['"]?\)$/g,'');
- }
- return !(!_this.image.src || _this.image.src === 'none');
- };
- Jarallax.prototype.init = function () {
- var _this = this,
- containerStyles = {
- position : 'absolute',
- top : 0,
- left : 0,
- width : '100%',
- height : '100%',
- overflow : 'hidden',
- pointerEvents : 'none'
- },
- imageStyles = {
- position : 'fixed'
- };
- // container for parallax image
- _this.image.$container = document.createElement('div');
- _this.css(_this.image.$container, containerStyles);
- _this.css(_this.image.$container, {
- visibility : 'hidden',
- 'z-index' : _this.options.zIndex
- });
- _this.image.$container.setAttribute('id', 'jarallax-container-' + _this.instanceID);
- _this.$item.appendChild(_this.image.$container);
- // use img tag
- if(_this.image.useImgTag && supportTransform && _this.options.enableTransform) {
- _this.image.$item = document.createElement('img');
- _this.image.$item.setAttribute('src', _this.image.src);
- imageStyles = _this.extend({
- 'max-width' : 'none'
- }, containerStyles, imageStyles);
- }
- // use div with background image
- else {
- _this.image.$item = document.createElement('div');
- imageStyles = _this.extend({
- 'background-position' : '50% 50%',
- 'background-size' : '100% auto',
- 'background-repeat' : 'no-repeat no-repeat',
- 'background-image' : 'url("' + _this.image.src + '")'
- }, containerStyles, imageStyles);
- }
- if(isIElt10 || isIE11 || isIE10 || isEdge ) {
- imageStyles.backgroundAttachment = 'fixed';
- } else imageStyles.backgroundAttachment = 'scroll';
- // check if one of parents have transform style (without this check, scroll transform will be inverted)
- // discussion - https://github.com/nk-o/jarallax/issues/9
- _this.parentWithTransform = 0;
- var $itemParents = _this.$item;
- while ($itemParents !== null && $itemParents !== document && _this.parentWithTransform === 0) {
- var parent_transform = _this.css($itemParents, '-webkit-transform') || _this.css($itemParents, '-moz-transform') || _this.css($itemParents, 'transform');
- if(parent_transform && parent_transform !== 'none') {
- _this.parentWithTransform = 1;
- // add transform on parallax container if there is parent with transform
- _this.css(_this.image.$container, {
- transform: 'translateX(0) translateY(0)'
- });
- }
- $itemParents = $itemParents.parentNode;
- }
- // parallax image
- _this.css(_this.image.$item, imageStyles);
- _this.image.$container.appendChild(_this.image.$item);
- // cover image if width and height is ready
- function initAfterReady () {
- _this.coverImage();
- _this.clipContainer();
- _this.onScroll(true);
- // save default user styles
- _this.$item.setAttribute('data-jarallax-original-styles', _this.$item.getAttribute('style'));
- // call onInit event
- if(_this.options.onInit) {
- _this.options.onInit.call(_this);
- }
- // timeout to fix IE blinking
- setTimeout(function () {
- if(_this.$item) {
- if(isIElt10 || isIE11 || isIE10 || isEdge ) {
- $backgroundAttachment = 'fixed';
- } else $backgroundAttachment = 'scroll';
- // remove default user background
- _this.css(_this.$item, {
- 'background-image' : 'none',
- 'background-attachment' : $backgroundAttachment,
- 'background-size' : 'auto'
- });
- }
- }, 0);
- }
- if(_this.image.width && _this.image.height) {
- // init if width and height already exists
- initAfterReady();
- } else {
- // load image and get width and height
- _this.getImageSize(_this.image.src, function (width, height) {
- _this.image.width = width;
- _this.image.height = height;
- initAfterReady();
- });
- }
- jarallaxList.push(_this);
- };
- Jarallax.prototype.destroy = function () {
- var _this = this;
- // remove from instances list
- for(var k = 0, len = jarallaxList.length; k < len; k++) {
- if(jarallaxList[k].instanceID === _this.instanceID) {
- jarallaxList.splice(k, 1);
- break;
- }
- }
- // return styles on container as before jarallax init
- var originalStylesTag = _this.$item.getAttribute('data-jarallax-original-styles');
- _this.$item.removeAttribute('data-jarallax-original-styles');
- // null occurs if there is no style tag before jarallax init
- if(originalStylesTag === 'null') {
- _this.$item.removeAttribute('style');
- } else {
- _this.$item.setAttribute('style', originalStylesTag);
- }
- // remove additional dom elements
- if(_this.$clipStyles) {
- _this.$clipStyles.parentNode.removeChild(_this.$clipStyles);
- }
- _this.image.$container.parentNode.removeChild(_this.image.$container);
- // call onDestroy event
- if(_this.options.onDestroy) {
- _this.options.onDestroy.call(_this);
- }
- // delete jarallax from item
- delete _this.$item.jarallax;
- // delete all variables
- for(var n in _this) {
- delete _this[n];
- }
- };
- Jarallax.prototype.getImageSize = function (src, callback) {
- if(!src || !callback) {
- return;
- }
- var tempImg = new Image();
- tempImg.onload = function () {
- callback(tempImg.width, tempImg.height);
- };
- tempImg.src = src;
- };
- // it will remove some image overlapping
- // overlapping occur due to an image position fixed inside absolute position element (webkit based browsers works without any fix)
- Jarallax.prototype.clipContainer = function () {
- // clip is not working properly on real IE9 and less
- if(isIElt10) {
- return;
- }
- var _this = this,
- rect = _this.image.$container.getBoundingClientRect(),
- width = rect.width,
- height = rect.height;
- if(!_this.$clipStyles) {
- _this.$clipStyles = document.createElement('style');
- _this.$clipStyles.setAttribute('type', 'text/css');
- _this.$clipStyles.setAttribute('id', '#jarallax-clip-' + _this.instanceID);
- var head = document.head || document.getElementsByTagName('head')[0];
- head.appendChild(_this.$clipStyles);
- }
- var styles = [
- '#jarallax-container-' + _this.instanceID + ' {',
- ' clip: rect(0 ' + width + 'px ' + height + 'px 0);',
- ' clip: rect(0, ' + width + 'px, ' + height + 'px, 0);',
- '}'
- ].join('\n');
- // add clip styles inline (this method need for support IE8 and less browsers)
- if (_this.$clipStyles.styleSheet){
- _this.$clipStyles.styleSheet.cssText = styles;
- } else {
- _this.$clipStyles.innerHTML = styles;
- }
- };
- Jarallax.prototype.coverImage = function () {
- var _this = this;
- if(!_this.image.width || !_this.image.height) {
- return;
- }
- var rect = _this.image.$container.getBoundingClientRect(),
- contW = rect.width,
- contH = rect.height,
- contL = rect.left,
- imgW = _this.image.width,
- imgH = _this.image.height,
- speed = _this.options.speed,
- isScroll = _this.options.type === 'scroll' || _this.options.type === 'scroll-opacity',
- scrollDist = 0,
- resultW = 0,
- resultH = contH,
- resultML = 0,
- resultMT = 0;
- // scroll parallax
- if(isScroll) {
- // scroll distance
- scrollDist = speed * (contH + wndH) / 2;
- if(speed < 0 || speed > 1) {
- scrollDist = speed * Math.max(contH, wndH) / 2;
- }
- // size for scroll parallax
- if(speed < 0 || speed > 1) {
- resultH = Math.max(contH, wndH) + Math.abs(scrollDist) * 2;
- } else {
- resultH += Math.abs(wndH - contH) * (1 - speed);
- }
- }
- // calculate width relative to height and image size
- resultW = resultH * imgW / imgH;
- if(resultW < contW) {
- resultW = contW;
- resultH = resultW * imgH / imgW;
- }
- // when disabled transformations, height should be >= window height
- _this.bgPosVerticalCenter = 0;
- if(isScroll && resultH < wndH && (!supportTransform || !_this.options.enableTransform)) {
- _this.bgPosVerticalCenter = (wndH - resultH) / 2;
- resultH = wndH;
- }
- // center parallax image
- if(isScroll) {
- resultML = contL + (contW - resultW) / 2;
- resultMT = (wndH - resultH) / 2;
- } else {
- resultML = (contW - resultW) / 2;
- resultMT = (contH - resultH) / 2;
- }
- // fix if parents with transform style
- if(supportTransform && _this.options.enableTransform && _this.parentWithTransform) {
- resultML -= contL;
- }
- // store scroll distance
- _this.parallaxScrollDistance = scrollDist;
- // apply result to item
- _this.css(_this.image.$item, {
- width: resultW + 'px',
- height: resultH + 'px',
- marginLeft: resultML + 'px',
- marginTop: resultMT + 'px'
- });
- // call onCoverImage event
- if(_this.options.onCoverImage) {
- _this.options.onCoverImage.call(_this);
- }
- };
- Jarallax.prototype.isVisible = function () {
- return this.isElementInViewport || false;
- };
- Jarallax.prototype.onScroll = function (force) {
- var _this = this;
- if(!_this.image.width || !_this.image.height) {
- return;
- }
- var rect = _this.$item.getBoundingClientRect(),
- contT = rect.top,
- contH = rect.height,
- styles = {
- position : 'absolute',
- visibility : 'visible',
- backgroundPosition : '50% 50%'
- };
- // check if in viewport
- var viewportRect = rect;
- if(_this.options.elementInViewport) {
- viewportRect = _this.options.elementInViewport.getBoundingClientRect();
- }
- _this.isElementInViewport =
- viewportRect.bottom >= 0 &&
- viewportRect.right >= 0 &&
- viewportRect.top <= wndH &&
- viewportRect.left <= wndW;
- // stop calculations if item is not in viewport
- if (force ? false : !_this.isElementInViewport) {
- return;
- }
- // calculate parallax helping variables
- var beforeTop = Math.max(0, contT),
- beforeTopEnd = Math.max(0, contH + contT),
- afterTop = Math.max(0, -contT),
- beforeBottom = Math.max(0, contT + contH - wndH),
- beforeBottomEnd = Math.max(0, contH - (contT + contH - wndH)),
- afterBottom = Math.max(0, -contT + wndH - contH),
- fromViewportCenter = 1 - 2 * (wndH - contT) / (wndH + contH);
- // calculate on how percent of section is visible
- var visiblePercent = 1;
- if(contH < wndH) {
- visiblePercent = 1 - (afterTop || beforeBottom) / contH;
- } else {
- if(beforeTopEnd <= wndH) {
- visiblePercent = beforeTopEnd / wndH;
- } else if (beforeBottomEnd <= wndH) {
- visiblePercent = beforeBottomEnd / wndH;
- }
- }
- // opacity
- if(_this.options.type === 'opacity' || _this.options.type === 'scale-opacity' || _this.options.type === 'scroll-opacity') {
- styles.transform = 'translate3d(0, 0, 0)';
- styles.opacity = visiblePercent;
- }
- // scale
- if(_this.options.type === 'scale' || _this.options.type === 'scale-opacity') {
- var scale = 1;
- if(_this.options.speed < 0) {
- scale -= _this.options.speed * visiblePercent;
- } else {
- scale += _this.options.speed * (1 - visiblePercent);
- }
- styles.transform = 'scale(' + scale + ') translate3d(0, 0, 0)';
- }
- // scroll
- if(_this.options.type === 'scroll' || _this.options.type === 'scroll-opacity') {
- var positionY = _this.parallaxScrollDistance * fromViewportCenter;
- if(supportTransform && _this.options.enableTransform) {
- // fix if parents with transform style
- if(_this.parentWithTransform) {
- positionY -= contT;
- }
- styles.transform = 'translate3d(0, ' + positionY + 'px, 0)';
- } else if (_this.image.useImgTag) {
- styles.top = positionY + 'px';
- } else {
- // vertical centering
- if(_this.bgPosVerticalCenter) {
- positionY += _this.bgPosVerticalCenter;
- }
- styles.backgroundPosition = '50% ' + positionY + 'px';
- }
- // fixed position is not work properly for IE9 and less
- // solution - use absolute position and emulate fixed by using container offset
- styles.position = isIElt10 ? 'absolute' : 'fixed';
- }
- _this.css(_this.image.$item, styles);
- // call onScroll event
- if(_this.options.onScroll) {
- _this.options.onScroll.call(_this, {
- section: rect,
- beforeTop: beforeTop,
- beforeTopEnd: beforeTopEnd,
- afterTop: afterTop,
- beforeBottom: beforeBottom,
- beforeBottomEnd: beforeBottomEnd,
- afterBottom: afterBottom,
- visiblePercent: visiblePercent,
- fromViewportCenter: fromViewportCenter
- });
- }
- };
- // init events
- function addEventListener (el, eventName, handler) {
- if (el.addEventListener) {
- el.addEventListener(eventName, handler);
- } else {
- el.attachEvent('on' + eventName, function (){
- handler.call(el);
- });
- }
- }
- function update (e) {
- window.requestAnimationFrame(function () {
- if(e.type !== 'scroll') {
- updateWndVars();
- }
- for(var k = 0, len = jarallaxList.length; k < len; k++) {
- // cover image and clip needed only when parallax container was changed
- if(e.type !== 'scroll') {
- jarallaxList[k].coverImage();
- jarallaxList[k].clipContainer();
- }
- jarallaxList[k].onScroll();
- }
- });
- }
- addEventListener(window, 'scroll', update);
- addEventListener(window, 'resize', update);
- addEventListener(window, 'orientationchange', update);
- addEventListener(window, 'load', update);
- // global definition
- var plugin = function (items) {
- // check for dom element
- // thanks: http://stackoverflow.com/questions/384286/javascript-isdom-how-do-you-check-if-a-javascript-object-is-a-dom-object
- if(typeof HTMLElement === "object" ? items instanceof HTMLElement : items && typeof items === "object" && items !== null && items.nodeType === 1 && typeof items.nodeName==="string") {
- items = [items];
- }
- var options = arguments[1],
- args = Array.prototype.slice.call(arguments, 2),
- len = items.length,
- k = 0,
- ret;
- for (k; k < len; k++) {
- if (typeof options === 'object' || typeof options === 'undefined') {
- if(!items[k].jarallax) {
- items[k].jarallax = new Jarallax(items[k], options);
- }
- }
- else if(items[k].jarallax) {
- ret = items[k].jarallax[options].apply(items[k].jarallax, args);
- }
- if (typeof ret !== 'undefined') {
- return ret;
- }
- }
- return items;
- };
- plugin.constructor = Jarallax;
- // no conflict
- var oldPlugin = window.jarallax;
- window.jarallax = plugin;
- window.jarallax.noConflict = function () {
- window.jarallax = oldPlugin;
- return this;
- };
- // jQuery support
- if(typeof jQuery !== 'undefined') {
- var jQueryPlugin = function () {
- var args = arguments || [];
- Array.prototype.unshift.call(args, this);
- var res = plugin.apply(window, args);
- return typeof res !== 'object' ? res : this;
- };
- jQueryPlugin.constructor = Jarallax;
- // no conflict
- var oldJqPlugin = jQuery.fn.jarallax;
- jQuery.fn.jarallax = jQueryPlugin;
- jQuery.fn.jarallax.noConflict = function () {
- jQuery.fn.jarallax = oldJqPlugin;
- return this;
- };
- }
- // data-jarallax initialization
- addEventListener(window, 'DOMContentLoaded', function () {
- plugin(document.querySelectorAll('[data-jarallax], [data-jarallax-video]'));
- });
- }(window));
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