/ajax/libs//1.1/parallax.js
JavaScript | 343 lines | 265 code | 65 blank | 13 comment | 87 complexity | 26be6f0cd38d8572f048de3912f6c6fe MD5 | raw file
- /*!
- * parallax.js v1.1 (http://pixelcog.github.io/parallax.js/)
- * Copyright (c) 2014 PixelCog, Inc.
- * Licensed under MIT (https://github.com/pixelcog/parallax.js/blob/master/LICENSE)
- */
- ;(function ( $, window, document, undefined ) {
- // Polyfill for requestAnimationFrame
- // via: https://gist.github.com/paulirish/1579671
- (function() {
- var lastTime = 0;
- var vendors = ['ms', 'moz', 'webkit', 'o'];
- for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
- window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
- window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
- || window[vendors[x]+'CancelRequestAnimationFrame'];
- }
- if (!window.requestAnimationFrame)
- window.requestAnimationFrame = function(callback, element) {
- var currTime = new Date().getTime();
- var timeToCall = Math.max(0, 16 - (currTime - lastTime));
- var id = window.setTimeout(function() { callback(currTime + timeToCall); },
- timeToCall);
- lastTime = currTime + timeToCall;
- return id;
- };
- if (!window.cancelAnimationFrame)
- window.cancelAnimationFrame = function(id) {
- clearTimeout(id);
- };
- }());
- // Parallax Constructor
- var $body = $('body');
- var $window = $(window);
- function Parallax(element, options) {
- var self = this;
- if (typeof options == 'object') {
- delete options.refresh;
- delete options.render;
- $.extend(this, options);
- }
- this.$element = $(element);
- if (!this.imageSrc && this.$element.is('img')) {
- this.imageSrc = this.$element.attr('src');
- }
- var positions = (this.position + '').toLowerCase().match(/\S+/g) || [];
- if (positions.length < 1) {
- positions.push('center');
- }
- if (positions.length == 1) {
- positions.push(positions[0]);
- }
- if (positions[0] == 'top' || positions[0] == 'bottom' ||
- positions[1] == 'left' || positions[1] == 'right') {
- self.positionX = positions[1];
- self.positionY = positions[0];
- } else {
- self.positionX = positions[0];
- self.positionY = positions[1];
- }
- if (this.positionX != undefined) positions[0] = this.positionX.toLowerCase();
- if (this.positionY != undefined) positions[1] = this.positionY.toLowerCase();
- if (this.positionX != 'left' && this.positionX != 'right') {
- if (isNaN(parseInt(this.positionX))) {
- this.positionX = 'center';
- } else {
- this.positionX = parseInt(this.positionX);
- }
- }
- if (this.positionY != 'top' && this.positionY != 'bottom') {
- if (isNaN(parseInt(this.positionY))) {
- this.positionY = 'center';
- } else {
- this.positionY = parseInt(this.positionY);
- }
- }
- this.position =
- this.positionX + (isNaN(this.positionX)? '' : 'px') + ' ' +
- this.positionY + (isNaN(this.positionY)? '' : 'px');
- if (navigator.userAgent.match(/(iPod|iPhone|iPad)/)) {
- if (this.iosFix && !this.$element.is('img')) {
- this.$element.css({
- backgroundImage: 'url(' + encodeURIComponent(this.imageSrc) + ')',
- backgroundSize: 'cover',
- backgroundPosition: this.position
- });
- }
- return this;
- }
- this.$mirror = $('<div />').prependTo('body');
- this.$slider = $('<img />').prependTo(this.$mirror);
- this.$mirror.addClass('parallax-mirror').css({
- visibility: 'hidden',
- zIndex: this.zIndex,
- position: 'fixed',
- top: 0,
- left: 0,
- overflow: 'hidden'
- });
- this.$slider.addClass('parallax-slider').one('load', function() {
- if (!self.naturalHeight || !self.naturalWidth) {
- self.naturalHeight = this.naturalHeight || this.height || 1;
- self.naturalWidth = this.naturalWidth || this.width || 1;
- }
- self.aspectRatio = self.naturalWidth / self.naturalHeight;
- Parallax.isSetup || Parallax.setup();
- Parallax.sliders.push(self);
- Parallax.isFresh = false;
- Parallax.requestRender();
- });
- this.$slider[0].src = this.imageSrc;
- if (this.naturalHeight && this.naturalWidth || this.$slider[0].complete) {
- this.$slider.trigger('load');
- }
- };
- // Parallax Instance Methods
- $.extend(Parallax.prototype, {
- speed: 0.2,
- bleed: 0,
- zIndex: -100,
- iosFix: true,
- position: 'center',
- refresh: function() {
- this.boxWidth = this.$element.width();
- this.boxHeight = this.$element.height() + this.bleed * 2;
- this.boxOffsetTop = this.$element.offset().top - this.bleed;
- this.boxOffsetLeft = this.$element.offset().left;
- this.boxOffsetBottom = this.boxOffsetTop + this.boxHeight;
- var margin = 0;
- var winHeight = Parallax.winHeight;
- var imageHeightMin = winHeight - (winHeight - this.boxHeight) * this.speed | 0;
- if (imageHeightMin * this.aspectRatio >= this.boxWidth) {
- this.imageWidth = imageHeightMin * this.aspectRatio | 0;
- this.imageHeight = imageHeightMin;
- this.offsetBaseTop = 0;
- margin = this.imageWidth - this.boxWidth;
- if (this.positionX == 'left') {
- this.offsetLeft = 0;
- } else if (this.positionX == 'right') {
- this.offsetLeft = - margin;
- } else if (!isNaN(this.positionX)) {
- this.offsetLeft = Math.max(this.positionX, - margin);
- } else {
- this.offsetLeft = - margin / 2 | 0;
- }
- } else {
- this.imageWidth = this.boxWidth;
- this.imageHeight = this.boxWidth / this.aspectRatio | 0;
- this.offsetLeft = 0;
- margin = this.imageHeight - imageHeightMin;
- if (this.positionY == 'top') {
- this.offsetBaseTop = 0;
- } else if (this.positionY == 'bottom') {
- this.offsetBaseTop = - margin;
- } else if (!isNaN(this.positionY)) {
- this.offsetBaseTop = Math.max(this.positionY, - margin);
- } else {
- this.offsetBaseTop = - margin / 2 | 0;
- }
- }
- },
- render: function() {
- var scrollTop = Parallax.scrollTop;
- var scrollLeft = Parallax.scrollLeft;
- var scrollBottom = scrollTop + Parallax.winHeight;
- if (this.boxOffsetBottom > scrollTop && this.boxOffsetTop < scrollBottom) {
- this.visibility = 'visible';
- } else {
- this.visibility = 'hidden';
- }
- this.mirrorTop = this.boxOffsetTop - scrollTop;
- this.mirrorLeft = this.boxOffsetLeft - scrollLeft;
- this.offsetTop = this.offsetBaseTop - this.mirrorTop * (1 - this.speed);
- this.$mirror.css({
- transform: 'translate3d(0px, 0px, 0px)',
- visibility: this.visibility,
- top: this.mirrorTop,
- left: this.mirrorLeft,
- height: this.boxHeight,
- width: this.boxWidth
- });
- this.$slider.css({
- transform: 'translate3d(0px, 0px, 0px)',
- position: 'absolute',
- top: this.offsetTop,
- left: this.offsetLeft,
- height: this.imageHeight,
- width: this.imageWidth
- });
- }
- });
- // Parallax Static Methods
- $.extend(Parallax, {
- scrollTop: 0,
- scrollLeft: 0,
- winHeight: 0,
- winWidth: 0,
- docHeight: 1 << 30,
- docWidth: 1 << 30,
- sliders: [],
- isReady: false,
- isFresh: false,
- isBusy: false,
- setup: function() {
- if (this.isReady) return;
- $window
- .on('scroll.px.parallax load.px.parallax', function() {
- var scrollTopMax = Parallax.docHeight - Parallax.winHeight;
- var scrollLeftMax = Parallax.docWidth - Parallax.winWidth;
- Parallax.scrollTop = Math.max(0, Math.min(scrollTopMax, $window.scrollTop()));
- Parallax.scrollLeft = Math.max(0, Math.min(scrollLeftMax, $window.scrollLeft()));
- Parallax.requestRender();
- })
- .on('resize.px.parallax load.px.parallax', function() {
- Parallax.winHeight = $window.height();
- Parallax.winWidth = $window.width();
- Parallax.docHeight = $(document).height();
- Parallax.docWidth = $(document).width();
- Parallax.isFresh = false;
- Parallax.requestRender();
- });
- this.isReady = true;
- },
- configure: function(options) {
- if (typeof options == 'object') {
- delete options.refresh;
- delete options.render;
- $.extend(this.prototype, options);
- }
- },
- refresh: function() {
- $.each(this.sliders, function(){ this.refresh() });
- this.isFresh = true;
- },
- render: function() {
- this.isFresh || this.refresh();
- $.each(this.sliders, function(){ this.render() });
- },
- requestRender: function() {
- var self = this;
- if (!this.isBusy) {
- this.isBusy = true;
- window.requestAnimationFrame(function() {
- self.render();
- self.isBusy = false;
- });
- }
- }
- });
- // Parallax Plugin Definition
- function Plugin(option) {
- return this.each(function () {
- var $this = $(this);
- var options = typeof option == 'object' && option;
- if (this == window || this == document || $this.is('body')) {
- Parallax.configure(options);
- }
- else if (!$this.data('px.parallax')) {
- options = $.extend({}, $this.data(), options);
- $this.data('px.parallax', new Parallax(this, options));
- }
- if (typeof option == 'string') {
- Parallax[option]();
- }
- })
- };
- var old = $.fn.parallax;
- $.fn.parallax = Plugin;
- $.fn.parallax.Constructor = Parallax;
- // Parallax No Conflict
- $.fn.parallax.noConflict = function () {
- $.fn.parallax = old;
- return this;
- };
- // Parallax Data-API
- $(document).on('ready.px.parallax.data-api', function () {
- $('[data-parallax="scroll"]').parallax();
- });
- }(jQuery, window, document));