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/**
* Flickity background lazyload v1.0.1
* lazyload background cell images
*/
/*jshint browser: true, unused: true, undef: true */
( function( window, factory ) {
// universal module definition
/*globals define, module, require */
if ( typeof define == 'function' && define.amd ) {
// AMD
define( [
'flickity/js/index',
'fizzy-ui-utils/utils'
], factory );
} else if ( typeof module == 'object' && module.exports ) {
// CommonJS
module.exports = factory(
require('flickity'),
require('fizzy-ui-utils')
);
} else {
// browser global
factory(
window.Flickity,
window.fizzyUIUtils
);
}
}( window, function factory( Flickity, utils ) {
/*jshint strict: true */
'use strict';
Flickity.createMethods.push('_createBgLazyLoad');
var proto = Flickity.prototype;
proto._createBgLazyLoad = function() {
this.on( 'select', this.bgLazyLoad );
};
proto.bgLazyLoad = function() {
var lazyLoad = this.options.bgLazyLoad;
if ( !lazyLoad ) {
return;
}
// get adjacent cells, use lazyLoad option for adjacent count
var adjCount = typeof lazyLoad == 'number' ? lazyLoad : 0;
var cellElems = this.getAdjacentCellElements( adjCount );
for ( var i=0; i < cellElems.length; i++ ) {
var cellElem = cellElems[i];
this.bgLazyLoadElem( cellElem );
// select lazy elems in cell
var children = cellElem.querySelectorAll('[data-flickity-bg-lazyload]');
for ( var j=0; j < children.length; j++ ) {
this.bgLazyLoadElem( children[j] );
}
}
};
proto.bgLazyLoadElem = function( elem ) {
var attr = elem.getAttribute('data-flickity-bg-lazyload');
if ( attr ) {
new BgLazyLoader( elem, attr, this );
}
};
// -------------------------- LazyBGLoader -------------------------- //
/**
* class to handle loading images
*/
function BgLazyLoader( elem, url, flickity ) {
this.element = elem;
this.url = url;
this.img = new Image();
this.flickity = flickity;
this.load();
}
BgLazyLoader.prototype.handleEvent = utils.handleEvent;
BgLazyLoader.prototype.load = function() {
this.img.addEventListener( 'load', this );
this.img.addEventListener( 'error', this );
// load image
this.img.src = this.url;
// remove attr
this.element.removeAttribute('data-flickity-bg-lazyload');
};
BgLazyLoader.prototype.onload = function( event ) {
this.element.style.backgroundImage = 'url("' + this.url + '")';
this.complete( event, 'flickity-bg-lazyloaded' );
};
BgLazyLoader.prototype.onerror = function( event ) {
this.complete( event, 'flickity-bg-lazyerror' );
};
BgLazyLoader.prototype.complete = function( event, className ) {
// unbind events
this.img.removeEventListener( 'load', this );
this.img.removeEventListener( 'error', this );
this.element.classList.add( className );
this.flickity.dispatchEvent( 'bgLazyLoad', event, this.element );
};
// ----- ----- //
Flickity.BgLazyLoader = BgLazyLoader;
return Flickity;
}));