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/*!
* parallax-element.js
* jQuery plugin to add parallax effect to individual elements
* @author Shaun M. Baer
* @url https://github.com/iamhexcoder/parallax-element
* @license MIT
*/
(function( $, window, document, undefined ) { $.fn.parallaxElement = function(options) {
/*! requestAnimationFrame Polyfill via Paul Irish: 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);
};
}
}());
/*! end requestAnimationFrame Polyfill */
var defaults = {
defaultSpeed: 0.2,
useOffset: true,
defaultOffset: 200,
disableMobile: false,
minWidth: false
};
var opts = $.extend( {}, defaults, options );
if( opts.disableMobile && /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
return false;
}
var windowYOffset = window.pageYOffset;
var winHeight = "innerHeight" in window ? window.innerHeight : document.documentElement.offsetHeight;
var winWidth = "innerWidth" in window ? window.innerWidth : document.documentElement.clientWidth;
var navToggle = $('#filter-toggle');
var winBottom = (windowYOffset + winHeight);
var body = document.body;
var html = document.documentElement;
var docHeight = Math.max( body.scrollHeight, body.offsetHeight,
html.clientHeight, html.scrollHeight, html.offsetHeight );
$(window).on('resize', function(){
winHeight = "innerHeight" in window ? window.innerHeight : document.documentElement.offsetHeight;
winWidth = window.innerWidth;
docHeight = Math.max( body.scrollHeight, body.offsetHeight,
html.clientHeight, html.scrollHeight, html.offsetHeight );
});
function runScrollElement(el) {
var thisTop = el.offset().top;
if( opts.useOffset && thisTop - opts.defaultOffset > ( winBottom ) ) {
return false;
}
var speed = el.attr('data-speed') ? ( el.attr('data-speed') * -1 ) : ( opts.defaultSpeed * -1 );
var val;
if(el.hasClass('scroll-start-zero')) {
val = ( windowYOffset * speed );
} else {
val = ( ( windowYOffset - thisTop ) + ( winHeight / 2 ) ) * speed;
}
if(val > docHeight) {
val = docHeight;
}
var styleVal = 'translate3d( 0px, ' + val + 'px, 0px)';
el.css({
"-webkit-transform": styleVal,
"-moz-transform": styleVal,
"-ms-transform": styleVal,
"-o-transform": styleVal,
"transform": styleVal
});
}
var scrollEls = [];
this.each( function(i) {
scrollEls.push( $(this) );
});
window.addEventListener("load", function(){
if ( opts.minWidth && opts.minWidth > winWidth ) {
$(this).removeAttr('style');
return false;
}
$.each(scrollEls, function(i, el) {
windowYOffset = window.pageYOffset;
winBottom = (windowYOffset + winHeight);
runScrollElement(el);
});
});
return document.addEventListener('scroll', function(){
if( opts.minWidth && opts.minWidth > winWidth ) {
$(this).removeAttr('style');
return false;
}
$.each(scrollEls, function(i, el) {
windowYOffset = window.pageYOffset;
winBottom = (windowYOffset + winHeight);
window.requestAnimationFrame( function() {
runScrollElement(el);
});
});
});
}; }( jQuery, window, document ));