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/*! lozad.js - v1.14.0 - 2019-10-19
* https://github.com/ApoorvSaxena/lozad.js
* Copyright (c) 2019 Apoorv Saxena; Licensed MIT */
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = global || self, global.lozad = factory());
}(this, function () { 'use strict';
/**
* Detect IE browser
* @const {boolean}
* @private
*/
var isIE = typeof document !== 'undefined' && document.documentMode;
var defaultConfig = {
rootMargin: '0px',
threshold: 0,
load: function load(element) {
if (element.nodeName.toLowerCase() === 'picture') {
var img = document.createElement('img');
if (isIE && element.getAttribute('data-iesrc')) {
img.src = element.getAttribute('data-iesrc');
}
if (element.getAttribute('data-alt')) {
img.alt = element.getAttribute('data-alt');
}
element.append(img);
}
if (element.nodeName.toLowerCase() === 'video' && !element.getAttribute('data-src')) {
if (element.children) {
var childs = element.children;
var childSrc = void 0;
for (var i = 0; i <= childs.length - 1; i++) {
childSrc = childs[i].getAttribute('data-src');
if (childSrc) {
childs[i].src = childSrc;
}
}
element.load();
}
}
if (element.getAttribute('data-src')) {
element.src = element.getAttribute('data-src');
}
if (element.getAttribute('data-srcset')) {
element.setAttribute('srcset', element.getAttribute('data-srcset'));
}
if (element.getAttribute('data-background-image')) {
element.style.backgroundImage = 'url(\'' + element.getAttribute('data-background-image').split(',').join('\'),url(\'') + '\')';
} else if (element.getAttribute('data-background-image-set')) {
var imageSetLinks = element.getAttribute('data-background-image-set').split(',');
var firstUrlLink = imageSetLinks[0].substr(0, imageSetLinks[0].indexOf(' ')) || imageSetLinks[0]; // Substring before ... 1x
firstUrlLink = firstUrlLink.indexOf('url(') === -1 ? 'url(' + firstUrlLink + ')' : firstUrlLink;
if (imageSetLinks.length === 1) {
element.style.backgroundImage = firstUrlLink;
} else {
element.setAttribute('style', (element.getAttribute('style') || '') + ('background-image: ' + firstUrlLink + '; background-image: -webkit-image-set(' + imageSetLinks + '); background-image: image-set(' + imageSetLinks + ')'));
}
}
if (element.getAttribute('data-toggle-class')) {
element.classList.toggle(element.getAttribute('data-toggle-class'));
}
},
loaded: function loaded() {}
};
function markAsLoaded(element) {
element.setAttribute('data-loaded', true);
}
var isLoaded = function isLoaded(element) {
return element.getAttribute('data-loaded') === 'true';
};
var onIntersection = function onIntersection(load, loaded) {
return function (entries, observer) {
entries.forEach(function (entry) {
if (entry.intersectionRatio > 0 || entry.isIntersecting) {
observer.unobserve(entry.target);
if (!isLoaded(entry.target)) {
load(entry.target);
markAsLoaded(entry.target);
loaded(entry.target);
}
}
});
};
};
var getElements = function getElements(selector) {
var root = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : document;
if (selector instanceof Element) {
return [selector];
}
if (selector instanceof NodeList) {
return selector;
}
return root.querySelectorAll(selector);
};
function lozad () {
var selector = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '.lozad';
var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
var _Object$assign = Object.assign({}, defaultConfig, options),
root = _Object$assign.root,
rootMargin = _Object$assign.rootMargin,
threshold = _Object$assign.threshold,
load = _Object$assign.load,
loaded = _Object$assign.loaded;
var observer = void 0;
if (typeof window !== 'undefined' && window.IntersectionObserver) {
observer = new IntersectionObserver(onIntersection(load, loaded), {
root: root,
rootMargin: rootMargin,
threshold: threshold
});
}
return {
observe: function observe() {
var elements = getElements(selector, root);
for (var i = 0; i < elements.length; i++) {
if (isLoaded(elements[i])) {
continue;
}
if (observer) {
observer.observe(elements[i]);
continue;
}
load(elements[i]);
markAsLoaded(elements[i]);
loaded(elements[i]);
}
},
triggerLoad: function triggerLoad(element) {
if (isLoaded(element)) {
return;
}
load(element);
markAsLoaded(element);
loaded(element);
},
observer: observer
};
}
return lozad;
}));