File "stellar.js"
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/*!
* Stellar.js v0.6.2
* http://markdalgleish.com/projects/stellar.js
*
* Copyright 2013, Mark Dalgleish
* This content is released under the MIT license
* http://markdalgleish.mit-license.org
*/
;(function($, window, document, undefined) {
var pluginName = 'stellar',
defaults = {
scrollProperty: 'scroll',
positionProperty: 'position',
horizontalScrolling: true,
verticalScrolling: true,
horizontalOffset: 0,
verticalOffset: 0,
responsive: false,
parallaxBackgrounds: true,
parallaxElements: true,
hideDistantElements: true,
hideElement: function($elem) { $elem.hide(); },
showElement: function($elem) { $elem.show(); }
},
scrollProperty = {
scroll: {
getLeft: function($elem) { return $elem.scrollLeft(); },
setLeft: function($elem, val) { $elem.scrollLeft(val); },
getTop: function($elem) { return $elem.scrollTop(); },
setTop: function($elem, val) { $elem.scrollTop(val); }
},
position: {
getLeft: function($elem) { return parseInt($elem.css('left'), 10) * -1; },
getTop: function($elem) { return parseInt($elem.css('top'), 10) * -1; }
},
margin: {
getLeft: function($elem) { return parseInt($elem.css('margin-left'), 10) * -1; },
getTop: function($elem) { return parseInt($elem.css('margin-top'), 10) * -1; }
},
transform: {
getLeft: function($elem) {
var computedTransform = getComputedStyle($elem[0])[prefixedTransform];
return (computedTransform !== 'none' ? parseInt(computedTransform.match(/(-?[0-9]+)/g)[4], 10) * -1 : 0);
},
getTop: function($elem) {
var computedTransform = getComputedStyle($elem[0])[prefixedTransform];
return (computedTransform !== 'none' ? parseInt(computedTransform.match(/(-?[0-9]+)/g)[5], 10) * -1 : 0);
}
}
},
positionProperty = {
position: {
setLeft: function($elem, left) { $elem.css('left', left); },
setTop: function($elem, top) { $elem.css('top', top); }
},
transform: {
setPosition: function($elem, left, startingLeft, top, startingTop) {
$elem[0].style[prefixedTransform] = 'translate3d(' + (left - startingLeft) + 'px, ' + (top - startingTop) + 'px, 0)';
}
}
},
// Returns a function which adds a vendor prefix to any CSS property name
vendorPrefix = (function() {
var prefixes = /^(Moz|Webkit|Khtml|O|ms|Icab)(?=[A-Z])/,
style = $('script')[0].style,
prefix = '',
prop;
for (prop in style) {
if (prefixes.test(prop)) {
prefix = prop.match(prefixes)[0];
break;
}
}
if ('WebkitOpacity' in style) { prefix = 'Webkit'; }
if ('KhtmlOpacity' in style) { prefix = 'Khtml'; }
return function(property) {
return prefix + (prefix.length > 0 ? property.charAt(0).toUpperCase() + property.slice(1) : property);
};
}()),
prefixedTransform = vendorPrefix('transform'),
supportsBackgroundPositionXY = $('<div />', { style: 'background:#fff' }).css('background-position-x') !== undefined,
setBackgroundPosition = (supportsBackgroundPositionXY ?
function($elem, x, y) {
$elem.css({
'background-position-x': x,
'background-position-y': y
});
} :
function($elem, x, y) {
$elem.css('background-position', x + ' ' + y);
}
),
getBackgroundPosition = (supportsBackgroundPositionXY ?
function($elem) {
return [
$elem.css('background-position-x'),
$elem.css('background-position-y')
];
} :
function($elem) {
return $elem.css('background-position').split(' ');
}
),
requestAnimFrame = (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback) {
setTimeout(callback, 1000 / 60);
}
);
function Plugin(element, options) {
this.element = element;
this.options = $.extend({}, defaults, options);
this._defaults = defaults;
this._name = pluginName;
this.init();
}
Plugin.prototype = {
init: function() {
this.options.name = pluginName + '_' + Math.floor(Math.random() * 1e9);
this._defineElements();
this._defineGetters();
this._defineSetters();
this._handleWindowLoadAndResize();
this._detectViewport();
this.refresh({ firstLoad: true });
if (this.options.scrollProperty === 'scroll') {
this._handleScrollEvent();
} else {
this._startAnimationLoop();
}
},
_defineElements: function() {
if (this.element === document.body) this.element = window;
this.$scrollElement = $(this.element);
this.$element = (this.element === window ? $('body') : this.$scrollElement);
this.$viewportElement = (this.options.viewportElement !== undefined ? $(this.options.viewportElement) : (this.$scrollElement[0] === window || this.options.scrollProperty === 'scroll' ? this.$scrollElement : this.$scrollElement.parent()) );
},
_defineGetters: function() {
var self = this,
scrollPropertyAdapter = scrollProperty[self.options.scrollProperty];
this._getScrollLeft = function() {
return scrollPropertyAdapter.getLeft(self.$scrollElement);
};
this._getScrollTop = function() {
return scrollPropertyAdapter.getTop(self.$scrollElement);
};
},
_defineSetters: function() {
var self = this,
scrollPropertyAdapter = scrollProperty[self.options.scrollProperty],
positionPropertyAdapter = positionProperty[self.options.positionProperty],
setScrollLeft = scrollPropertyAdapter.setLeft,
setScrollTop = scrollPropertyAdapter.setTop;
this._setScrollLeft = (typeof setScrollLeft === 'function' ? function(val) {
setScrollLeft(self.$scrollElement, val);
} : $.noop);
this._setScrollTop = (typeof setScrollTop === 'function' ? function(val) {
setScrollTop(self.$scrollElement, val);
} : $.noop);
this._setPosition = positionPropertyAdapter.setPosition ||
function($elem, left, startingLeft, top, startingTop) {
if (self.options.horizontalScrolling) {
positionPropertyAdapter.setLeft($elem, left, startingLeft);
}
if (self.options.verticalScrolling) {
positionPropertyAdapter.setTop($elem, top, startingTop);
}
};
},
_handleWindowLoadAndResize: function() {
var self = this,
$window = $(window);
if (self.options.responsive) {
$window.bind('load.' + this.name, function() {
self.refresh();
});
}
$window.bind('resize.' + this.name, function() {
self._detectViewport();
if (self.options.responsive) {
self.refresh();
}
});
},
refresh: function(options) {
var self = this,
oldLeft = self._getScrollLeft(),
oldTop = self._getScrollTop();
if (!options || !options.firstLoad) {
this._reset();
}
this._setScrollLeft(0);
this._setScrollTop(0);
this._setOffsets();
this._findParticles();
this._findBackgrounds();
// Fix for WebKit background rendering bug
if (options && options.firstLoad && /WebKit/.test(navigator.userAgent)) {
$(window).load(function() {
var oldLeft = self._getScrollLeft(),
oldTop = self._getScrollTop();
self._setScrollLeft(oldLeft + 1);
self._setScrollTop(oldTop + 1);
self._setScrollLeft(oldLeft);
self._setScrollTop(oldTop);
});
}
this._setScrollLeft(oldLeft);
this._setScrollTop(oldTop);
},
_detectViewport: function() {
var viewportOffsets = this.$viewportElement.offset(),
hasOffsets = viewportOffsets !== null && viewportOffsets !== undefined;
this.viewportWidth = this.$viewportElement.width();
this.viewportHeight = this.$viewportElement.height();
this.viewportOffsetTop = (hasOffsets ? viewportOffsets.top : 0);
this.viewportOffsetLeft = (hasOffsets ? viewportOffsets.left : 0);
},
_findParticles: function() {
var self = this,
scrollLeft = this._getScrollLeft(),
scrollTop = this._getScrollTop();
if (this.particles !== undefined) {
for (var i = this.particles.length - 1; i >= 0; i--) {
this.particles[i].$element.data('stellar-elementIsActive', undefined);
}
}
this.particles = [];
if (!this.options.parallaxElements) return;
this.$element.find('[data-stellar-ratio]').each(function(i) {
var $this = $(this),
horizontalOffset,
verticalOffset,
positionLeft,
positionTop,
marginLeft,
marginTop,
$offsetParent,
offsetLeft,
offsetTop,
parentOffsetLeft = 0,
parentOffsetTop = 0,
tempParentOffsetLeft = 0,
tempParentOffsetTop = 0;
// Ensure this element isn't already part of another scrolling element
if (!$this.data('stellar-elementIsActive')) {
$this.data('stellar-elementIsActive', this);
} else if ($this.data('stellar-elementIsActive') !== this) {
return;
}
self.options.showElement($this);
// Save/restore the original top and left CSS values in case we refresh the particles or destroy the instance
if (!$this.data('stellar-startingLeft')) {
$this.data('stellar-startingLeft', $this.css('left'));
$this.data('stellar-startingTop', $this.css('top'));
} else {
$this.css('left', $this.data('stellar-startingLeft'));
$this.css('top', $this.data('stellar-startingTop'));
}
positionLeft = $this.position().left;
positionTop = $this.position().top;
// Catch-all for margin top/left properties (these evaluate to 'auto' in IE7 and IE8)
marginLeft = ($this.css('margin-left') === 'auto') ? 0 : parseInt($this.css('margin-left'), 10);
marginTop = ($this.css('margin-top') === 'auto') ? 0 : parseInt($this.css('margin-top'), 10);
offsetLeft = $this.offset().left - marginLeft;
offsetTop = $this.offset().top - marginTop;
// Calculate the offset parent
$this.parents().each(function() {
var $this = $(this);
if ($this.data('stellar-offset-parent') === true) {
parentOffsetLeft = tempParentOffsetLeft;
parentOffsetTop = tempParentOffsetTop;
$offsetParent = $this;
return false;
} else {
tempParentOffsetLeft += $this.position().left;
tempParentOffsetTop += $this.position().top;
}
});
// Detect the offsets
horizontalOffset = ($this.data('stellar-horizontal-offset') !== undefined ? $this.data('stellar-horizontal-offset') : ($offsetParent !== undefined && $offsetParent.data('stellar-horizontal-offset') !== undefined ? $offsetParent.data('stellar-horizontal-offset') : self.horizontalOffset));
verticalOffset = ($this.data('stellar-vertical-offset') !== undefined ? $this.data('stellar-vertical-offset') : ($offsetParent !== undefined && $offsetParent.data('stellar-vertical-offset') !== undefined ? $offsetParent.data('stellar-vertical-offset') : self.verticalOffset));
// Add our object to the particles collection
self.particles.push({
$element: $this,
$offsetParent: $offsetParent,
isFixed: $this.css('position') === 'fixed',
horizontalOffset: horizontalOffset,
verticalOffset: verticalOffset,
startingPositionLeft: positionLeft,
startingPositionTop: positionTop,
startingOffsetLeft: offsetLeft,
startingOffsetTop: offsetTop,
parentOffsetLeft: parentOffsetLeft,
parentOffsetTop: parentOffsetTop,
stellarRatio: ($this.data('stellar-ratio') !== undefined ? $this.data('stellar-ratio') : 1),
width: $this.outerWidth(true),
height: $this.outerHeight(true),
isHidden: false
});
});
},
_findBackgrounds: function() {
var self = this,
scrollLeft = this._getScrollLeft(),
scrollTop = this._getScrollTop(),
$backgroundElements;
this.backgrounds = [];
if (!this.options.parallaxBackgrounds) return;
$backgroundElements = this.$element.find('[data-stellar-background-ratio]');
if (this.$element.data('stellar-background-ratio')) {
$backgroundElements = $backgroundElements.add(this.$element);
}
$backgroundElements.each(function() {
var $this = $(this),
backgroundPosition = getBackgroundPosition($this),
horizontalOffset,
verticalOffset,
positionLeft,
positionTop,
marginLeft,
marginTop,
offsetLeft,
offsetTop,
$offsetParent,
parentOffsetLeft = 0,
parentOffsetTop = 0,
tempParentOffsetLeft = 0,
tempParentOffsetTop = 0;
// Ensure this element isn't already part of another scrolling element
if (!$this.data('stellar-backgroundIsActive')) {
$this.data('stellar-backgroundIsActive', this);
} else if ($this.data('stellar-backgroundIsActive') !== this) {
return;
}
// Save/restore the original top and left CSS values in case we destroy the instance
if (!$this.data('stellar-backgroundStartingLeft')) {
$this.data('stellar-backgroundStartingLeft', backgroundPosition[0]);
$this.data('stellar-backgroundStartingTop', backgroundPosition[1]);
} else {
setBackgroundPosition($this, $this.data('stellar-backgroundStartingLeft'), $this.data('stellar-backgroundStartingTop'));
}
// Catch-all for margin top/left properties (these evaluate to 'auto' in IE7 and IE8)
marginLeft = ($this.css('margin-left') === 'auto') ? 0 : parseInt($this.css('margin-left'), 10);
marginTop = ($this.css('margin-top') === 'auto') ? 0 : parseInt($this.css('margin-top'), 10);
offsetLeft = $this.offset().left - marginLeft - scrollLeft;
offsetTop = $this.offset().top - marginTop - scrollTop;
// Calculate the offset parent
$this.parents().each(function() {
var $this = $(this);
if ($this.data('stellar-offset-parent') === true) {
parentOffsetLeft = tempParentOffsetLeft;
parentOffsetTop = tempParentOffsetTop;
$offsetParent = $this;
return false;
} else {
tempParentOffsetLeft += $this.position().left;
tempParentOffsetTop += $this.position().top;
}
});
// Detect the offsets
horizontalOffset = ($this.data('stellar-horizontal-offset') !== undefined ? $this.data('stellar-horizontal-offset') : ($offsetParent !== undefined && $offsetParent.data('stellar-horizontal-offset') !== undefined ? $offsetParent.data('stellar-horizontal-offset') : self.horizontalOffset));
verticalOffset = ($this.data('stellar-vertical-offset') !== undefined ? $this.data('stellar-vertical-offset') : ($offsetParent !== undefined && $offsetParent.data('stellar-vertical-offset') !== undefined ? $offsetParent.data('stellar-vertical-offset') : self.verticalOffset));
self.backgrounds.push({
$element: $this,
$offsetParent: $offsetParent,
isFixed: $this.css('background-attachment') === 'fixed',
horizontalOffset: horizontalOffset,
verticalOffset: verticalOffset,
startingValueLeft: backgroundPosition[0],
startingValueTop: backgroundPosition[1],
startingBackgroundPositionLeft: (isNaN(parseInt(backgroundPosition[0], 10)) ? 0 : parseInt(backgroundPosition[0], 10)),
startingBackgroundPositionTop: (isNaN(parseInt(backgroundPosition[1], 10)) ? 0 : parseInt(backgroundPosition[1], 10)),
startingPositionLeft: $this.position().left,
startingPositionTop: $this.position().top,
startingOffsetLeft: offsetLeft,
startingOffsetTop: offsetTop,
parentOffsetLeft: parentOffsetLeft,
parentOffsetTop: parentOffsetTop,
stellarRatio: ($this.data('stellar-background-ratio') === undefined ? 1 : $this.data('stellar-background-ratio'))
});
});
},
_reset: function() {
var particle,
startingPositionLeft,
startingPositionTop,
background,
i;
for (i = this.particles.length - 1; i >= 0; i--) {
particle = this.particles[i];
startingPositionLeft = particle.$element.data('stellar-startingLeft');
startingPositionTop = particle.$element.data('stellar-startingTop');
this._setPosition(particle.$element, startingPositionLeft, startingPositionLeft, startingPositionTop, startingPositionTop);
this.options.showElement(particle.$element);
particle.$element.data('stellar-startingLeft', null).data('stellar-elementIsActive', null).data('stellar-backgroundIsActive', null);
}
for (i = this.backgrounds.length - 1; i >= 0; i--) {
background = this.backgrounds[i];
background.$element.data('stellar-backgroundStartingLeft', null).data('stellar-backgroundStartingTop', null);
setBackgroundPosition(background.$element, background.startingValueLeft, background.startingValueTop);
}
},
destroy: function() {
this._reset();
this.$scrollElement.unbind('resize.' + this.name).unbind('scroll.' + this.name);
this._animationLoop = $.noop;
$(window).unbind('load.' + this.name).unbind('resize.' + this.name);
},
_setOffsets: function() {
var self = this,
$window = $(window);
$window.unbind('resize.horizontal-' + this.name).unbind('resize.vertical-' + this.name);
if (typeof this.options.horizontalOffset === 'function') {
this.horizontalOffset = this.options.horizontalOffset();
$window.bind('resize.horizontal-' + this.name, function() {
self.horizontalOffset = self.options.horizontalOffset();
});
} else {
this.horizontalOffset = this.options.horizontalOffset;
}
if (typeof this.options.verticalOffset === 'function') {
this.verticalOffset = this.options.verticalOffset();
$window.bind('resize.vertical-' + this.name, function() {
self.verticalOffset = self.options.verticalOffset();
});
} else {
this.verticalOffset = this.options.verticalOffset;
}
},
_repositionElements: function() {
var scrollLeft = this._getScrollLeft(),
scrollTop = this._getScrollTop(),
horizontalOffset,
verticalOffset,
particle,
fixedRatioOffset,
background,
bgLeft,
bgTop,
isVisibleVertical = true,
isVisibleHorizontal = true,
newPositionLeft,
newPositionTop,
newOffsetLeft,
newOffsetTop,
i;
// First check that the scroll position or container size has changed
if (this.currentScrollLeft === scrollLeft && this.currentScrollTop === scrollTop && this.currentWidth === this.viewportWidth && this.currentHeight === this.viewportHeight) {
return;
} else {
this.currentScrollLeft = scrollLeft;
this.currentScrollTop = scrollTop;
this.currentWidth = this.viewportWidth;
this.currentHeight = this.viewportHeight;
}
// Reposition elements
for (i = this.particles.length - 1; i >= 0; i--) {
particle = this.particles[i];
fixedRatioOffset = (particle.isFixed ? 1 : 0);
// Calculate position, then calculate what the particle's new offset will be (for visibility check)
if (this.options.horizontalScrolling) {
newPositionLeft = (scrollLeft + particle.horizontalOffset + this.viewportOffsetLeft + particle.startingPositionLeft - particle.startingOffsetLeft + particle.parentOffsetLeft) * -(particle.stellarRatio + fixedRatioOffset - 1) + particle.startingPositionLeft;
newOffsetLeft = newPositionLeft - particle.startingPositionLeft + particle.startingOffsetLeft;
} else {
newPositionLeft = particle.startingPositionLeft;
newOffsetLeft = particle.startingOffsetLeft;
}
if (this.options.verticalScrolling) {
newPositionTop = (scrollTop + particle.verticalOffset + this.viewportOffsetTop + particle.startingPositionTop - particle.startingOffsetTop + particle.parentOffsetTop) * -(particle.stellarRatio + fixedRatioOffset - 1) + particle.startingPositionTop;
newOffsetTop = newPositionTop - particle.startingPositionTop + particle.startingOffsetTop;
} else {
newPositionTop = particle.startingPositionTop;
newOffsetTop = particle.startingOffsetTop;
}
// Check visibility
if (this.options.hideDistantElements) {
isVisibleHorizontal = !this.options.horizontalScrolling || newOffsetLeft + particle.width > (particle.isFixed ? 0 : scrollLeft) && newOffsetLeft < (particle.isFixed ? 0 : scrollLeft) + this.viewportWidth + this.viewportOffsetLeft;
isVisibleVertical = !this.options.verticalScrolling || newOffsetTop + particle.height > (particle.isFixed ? 0 : scrollTop) && newOffsetTop < (particle.isFixed ? 0 : scrollTop) + this.viewportHeight + this.viewportOffsetTop;
}
if (isVisibleHorizontal && isVisibleVertical) {
if (particle.isHidden) {
this.options.showElement(particle.$element);
particle.isHidden = false;
}
this._setPosition(particle.$element, newPositionLeft, particle.startingPositionLeft, newPositionTop, particle.startingPositionTop);
} else {
if (!particle.isHidden) {
this.options.hideElement(particle.$element);
particle.isHidden = true;
}
}
}
// Reposition backgrounds
for (i = this.backgrounds.length - 1; i >= 0; i--) {
background = this.backgrounds[i];
fixedRatioOffset = (background.isFixed ? 0 : 1);
bgLeft = (this.options.horizontalScrolling ? (scrollLeft + background.horizontalOffset - this.viewportOffsetLeft - background.startingOffsetLeft + background.parentOffsetLeft - background.startingBackgroundPositionLeft) * (fixedRatioOffset - background.stellarRatio) + 'px' : background.startingValueLeft);
bgTop = (this.options.verticalScrolling ? (scrollTop + background.verticalOffset - this.viewportOffsetTop - background.startingOffsetTop + background.parentOffsetTop - background.startingBackgroundPositionTop) * (fixedRatioOffset - background.stellarRatio) + 'px' : background.startingValueTop);
setBackgroundPosition(background.$element, bgLeft, bgTop);
}
},
_handleScrollEvent: function() {
var self = this,
ticking = false;
var update = function() {
self._repositionElements();
ticking = false;
};
var requestTick = function() {
if (!ticking) {
requestAnimFrame(update);
ticking = true;
}
};
this.$scrollElement.bind('scroll.' + this.name, requestTick);
requestTick();
},
_startAnimationLoop: function() {
var self = this;
this._animationLoop = function() {
requestAnimFrame(self._animationLoop);
self._repositionElements();
};
this._animationLoop();
}
};
$.fn[pluginName] = function (options) {
var args = arguments;
if (options === undefined || typeof options === 'object') {
return this.each(function () {
if (!$.data(this, 'plugin_' + pluginName)) {
$.data(this, 'plugin_' + pluginName, new Plugin(this, options));
}
});
} else if (typeof options === 'string' && options[0] !== '_' && options !== 'init') {
return this.each(function () {
var instance = $.data(this, 'plugin_' + pluginName);
if (instance instanceof Plugin && typeof instance[options] === 'function') {
instance[options].apply(instance, Array.prototype.slice.call(args, 1));
}
if (options === 'destroy') {
$.data(this, 'plugin_' + pluginName, null);
}
});
}
};
$[pluginName] = function(options) {
var $window = $(window);
return $window.stellar.apply($window, Array.prototype.slice.call(arguments, 0));
};
// Expose the scroll and position property function hashes so they can be extended
$[pluginName].scrollProperty = scrollProperty;
$[pluginName].positionProperty = positionProperty;
// Expose the plugin class so it can be modified
window.Stellar = Plugin;
}(jQuery, this, document));