j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutMò/**
* animOnScroll.js v1.0.0
* http://www.codrops.com
*
* Licensed under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*
* Copyright 2013, Codrops
* http://www.codrops.com
*/
;( function( window ) {
'use strict';
var docElem = window.document.documentElement;
function getViewportH() {
var client = docElem['clientHeight'],
inner = window['innerHeight'];
if( client < inner )
return inner;
else
return client;
}
function scrollY() {
return window.pageYOffset || docElem.scrollTop;
}
// http://stackoverflow.com/a/5598797/989439
function getOffset( el ) {
var offsetTop = 0, offsetLeft = 0;
do {
if ( !isNaN( el.offsetTop ) ) {
offsetTop += el.offsetTop;
}
if ( !isNaN( el.offsetLeft ) ) {
offsetLeft += el.offsetLeft;
}
} while( el = el.offsetParent )
return {
top : offsetTop,
left : offsetLeft
}
}
function inViewport( el, h ) {
var elH = el.offsetHeight,
scrolled = scrollY(),
viewed = scrolled + getViewportH(),
elTop = getOffset(el).top,
elBottom = elTop + elH,
// if 0, the element is considered in the viewport as soon as it enters.
// if 1, the element is considered in the viewport only when it's fully inside
// value in percentage (1 >= h >= 0)
h = h || 0;
return (elTop + elH * h) <= viewed && (elBottom - elH * h) >= scrolled;
}
function extend( a, b ) {
for( var key in b ) {
if( b.hasOwnProperty( key ) ) {
a[key] = b[key];
}
}
return a;
}
function AnimOnScroll( el, options ) {
this.el = el;
this.options = extend( this.defaults, options );
this._init();
}
AnimOnScroll.prototype = {
defaults : {
// Minimum and a maximum duration of the animation (random value is chosen)
minDuration : 0,
maxDuration : 0,
// The viewportFactor defines how much of the appearing item has to be visible in order to trigger the animation
// if we'd use a value of 0, this would mean that it would add the animation class as soon as the item is in the viewport.
// If we were to use the value of 1, the animation would only be triggered when we see all of the item in the viewport (100% of it)
viewportFactor : 0
},
_init : function() {
this.items = Array.prototype.slice.call( document.querySelectorAll( '#' + this.el.id + ' > li' ) );
this.itemsCount = this.items.length;
this.itemsRenderedCount = 0;
this.didScroll = false;
var self = this;
imagesLoaded( this.el, function() {
// initialize masonry
new Masonry( self.el, {
itemSelector: 'li',
transitionDuration : 0
} );
if( Modernizr.cssanimations ) {
// the items already shown...
self.items.forEach( function( el, i ) {
if( inViewport( el ) ) {
self._checkTotalRendered();
classie.add( el, 'shown' );
}
} );
// animate on scroll the items inside the viewport
window.addEventListener( 'scroll', function() {
self._onScrollFn();
}, false );
window.addEventListener( 'resize', function() {
self._resizeHandler();
}, false );
}
});
},
_onScrollFn : function() {
var self = this;
if( !this.didScroll ) {
this.didScroll = true;
setTimeout( function() { self._scrollPage(); }, 60 );
}
},
_scrollPage : function() {
var self = this;
this.items.forEach( function( el, i ) {
if( !classie.has( el, 'shown' ) && !classie.has( el, 'animate' ) && inViewport( el, self.options.viewportFactor ) ) {
setTimeout( function() {
var perspY = scrollY() + getViewportH() / 2;
self.el.style.WebkitPerspectiveOrigin = '50% ' + perspY + 'px';
self.el.style.MozPerspectiveOrigin = '50% ' + perspY + 'px';
self.el.style.perspectiveOrigin = '50% ' + perspY + 'px';
self._checkTotalRendered();
if( self.options.minDuration && self.options.maxDuration ) {
var randDuration = ( Math.random() * ( self.options.maxDuration - self.options.minDuration ) + self.options.minDuration ) + 's';
el.style.WebkitAnimationDuration = randDuration;
el.style.MozAnimationDuration = randDuration;
el.style.animationDuration = randDuration;
}
classie.add( el, 'animate' );
}, 25 );
}
});
this.didScroll = false;
},
_resizeHandler : function() {
var self = this;
function delayed() {
self._scrollPage();
self.resizeTimeout = null;
}
if ( this.resizeTimeout ) {
clearTimeout( this.resizeTimeout );
}
this.resizeTimeout = setTimeout( delayed, 1000 );
},
_checkTotalRendered : function() {
++this.itemsRenderedCount;
if( this.itemsRenderedCount === this.itemsCount ) {
window.removeEventListener( 'scroll', this._onScrollFn );
}
}
}
// add to global namespace
window.AnimOnScroll = AnimOnScroll;
} )( window );text/javascriptUTF-8AnimOnScroll.js
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