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lazyload
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11.0.6
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lazyload.js
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function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); } function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); } (function (global, factory) { (typeof exports === "undefined" ? "undefined" : _typeof(exports)) === 'object' && typeof module !== 'undefined' ? module.exports = factory() : typeof define === 'function' && define.amd ? define(factory) : global.LazyLoad = factory(); })(this, function () { 'use strict'; var runningOnBrowser = typeof window !== "undefined"; var isBot = runningOnBrowser && !("onscroll" in window) || typeof navigator !== "undefined" && /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent); var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window; var supportsClassList = runningOnBrowser && "classList" in document.createElement("p"); var defaultSettings = { elements_selector: "img", container: isBot || runningOnBrowser ? document : null, threshold: 300, thresholds: null, data_src: "src", data_srcset: "srcset", data_sizes: "sizes", data_bg: "bg", class_loading: "loading", class_loaded: "loaded", class_error: "error", load_delay: 0, auto_unobserve: true, callback_enter: null, callback_exit: null, callback_reveal: null, callback_loaded: null, callback_error: null, callback_finish: null }; var getInstanceSettings = function getInstanceSettings(customSettings) { return _extends({}, defaultSettings, customSettings); }; var dataPrefix = "data-"; var processedDataName = "was-processed"; var timeoutDataName = "ll-timeout"; var trueString = "true"; var getData = function getData(element, attribute) { return element.getAttribute(dataPrefix + attribute); }; var setData = function setData(element, attribute, value) { var attrName = dataPrefix + attribute; if (value === null) { element.removeAttribute(attrName); return; } element.setAttribute(attrName, value); }; var setWasProcessedData = function setWasProcessedData(element) { return setData(element, processedDataName, trueString); }; var getWasProcessedData = function getWasProcessedData(element) { return getData(element, processedDataName) === trueString; }; var setTimeoutData = function setTimeoutData(element, value) { return setData(element, timeoutDataName, value); }; var getTimeoutData = function getTimeoutData(element) { return getData(element, timeoutDataName); }; var purgeProcessedElements = function purgeProcessedElements(elements) { return elements.filter(function (element) { return !getWasProcessedData(element); }); }; var purgeOneElement = function purgeOneElement(elements, elementToPurge) { return elements.filter(function (element) { return element !== elementToPurge; }); }; /* Creates instance and notifies it through the window element */ var createInstance = function createInstance(classObj, options) { var event; var eventString = "LazyLoad::Initialized"; var instance = new classObj(options); try { // Works in modern browsers event = new CustomEvent(eventString, { detail: { instance: instance } }); } catch (err) { // Works in Internet Explorer (all versions) event = document.createEvent("CustomEvent"); event.initCustomEvent(eventString, false, false, { instance: instance }); } window.dispatchEvent(event); }; /* Auto initialization of one or more instances of lazyload, depending on the options passed in (plain object or an array) */ function autoInitialize(classObj, options) { if (!options) { return; } if (!options.length) { // Plain object createInstance(classObj, options); } else { // Array of objects for (var i = 0, optionsItem; optionsItem = options[i]; i += 1) { createInstance(classObj, optionsItem); } } } var callbackIfSet = function callbackIfSet(callback, argument) { if (callback) { callback(argument); } }; var updateLoadingCount = function updateLoadingCount(instance, plusMinus) { instance._loadingCount += plusMinus; if (instance._elements.length === 0 && instance._loadingCount === 0) { callbackIfSet(instance._settings.callback_finish); } }; var getSourceTags = function getSourceTags(parentTag) { var sourceTags = []; for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) { if (childTag.tagName === "SOURCE") { sourceTags.push(childTag); } } return sourceTags; }; var setAttributeIfValue = function setAttributeIfValue(element, attrName, value) { if (!value) { return; } element.setAttribute(attrName, value); }; var setImageAttributes = function setImageAttributes(element, settings) { setAttributeIfValue(element, "sizes", getData(element, settings.data_sizes)); setAttributeIfValue(element, "srcset", getData(element, settings.data_srcset)); setAttributeIfValue(element, "src", getData(element, settings.data_src)); }; var setSourcesImg = function setSourcesImg(element, settings) { var parent = element.parentNode; if (parent && parent.tagName === "PICTURE") { var sourceTags = getSourceTags(parent); sourceTags.forEach(function (sourceTag) { setImageAttributes(sourceTag, settings); }); } setImageAttributes(element, settings); }; var setSourcesIframe = function setSourcesIframe(element, settings) { setAttributeIfValue(element, "src", getData(element, settings.data_src)); }; var setSourcesVideo = function setSourcesVideo(element, settings) { var sourceTags = getSourceTags(element); sourceTags.forEach(function (sourceTag) { setAttributeIfValue(sourceTag, "src", getData(sourceTag, settings.data_src)); }); setAttributeIfValue(element, "src", getData(element, settings.data_src)); element.load(); }; var setSourcesBgImage = function setSourcesBgImage(element, settings) { var srcDataValue = getData(element, settings.data_src); var bgDataValue = getData(element, settings.data_bg); if (srcDataValue) { element.style.backgroundImage = "url(\"".concat(srcDataValue, "\")"); } if (bgDataValue) { element.style.backgroundImage = bgDataValue; } }; var setSourcesFunctions = { IMG: setSourcesImg, IFRAME: setSourcesIframe, VIDEO: setSourcesVideo }; var setSources = function setSources(element, instance) { var settings = instance._settings; var tagName = element.tagName; var setSourcesFunction = setSourcesFunctions[tagName]; if (setSourcesFunction) { setSourcesFunction(element, settings); updateLoadingCount(instance, 1); instance._elements = purgeOneElement(instance._elements, element); return; } setSourcesBgImage(element, settings); }; var addClass = function addClass(element, className) { if (supportsClassList) { element.classList.add(className); return; } element.className += (element.className ? " " : "") + className; }; var removeClass = function removeClass(element, className) { if (supportsClassList) { element.classList.remove(className); return; } element.className = element.className.replace(new RegExp("(^|\\s+)" + className + "(\\s+|$)"), " ").replace(/^\s+/, "").replace(/\s+$/, ""); }; var genericLoadEventName = "load"; var mediaLoadEventName = "loadeddata"; var errorEventName = "error"; var addEventListener = function addEventListener(element, eventName, handler) { element.addEventListener(eventName, handler); }; var removeEventListener = function removeEventListener(element, eventName, handler) { element.removeEventListener(eventName, handler); }; var addEventListeners = function addEventListeners(element, loadHandler, errorHandler) { addEventListener(element, genericLoadEventName, loadHandler); addEventListener(element, mediaLoadEventName, loadHandler); addEventListener(element, errorEventName, errorHandler); }; var removeEventListeners = function removeEventListeners(element, loadHandler, errorHandler) { removeEventListener(element, genericLoadEventName, loadHandler); removeEventListener(element, mediaLoadEventName, loadHandler); removeEventListener(element, errorEventName, errorHandler); }; var eventHandler = function eventHandler(event, success, instance) { var settings = instance._settings; var className = success ? settings.class_loaded : settings.class_error; var callback = success ? settings.callback_loaded : settings.callback_error; var element = event.target; removeClass(element, settings.class_loading); addClass(element, className); callbackIfSet(callback, element); updateLoadingCount(instance, -1); }; var addOneShotEventListeners = function addOneShotEventListeners(element, instance) { var loadHandler = function loadHandler(event) { eventHandler(event, true, instance); removeEventListeners(element, loadHandler, errorHandler); }; var errorHandler = function errorHandler(event) { eventHandler(event, false, instance); removeEventListeners(element, loadHandler, errorHandler); }; addEventListeners(element, loadHandler, errorHandler); }; var managedTags = ["IMG", "IFRAME", "VIDEO"]; var onEnter = function onEnter(element, instance) { var settings = instance._settings; callbackIfSet(settings.callback_enter, element); if (!settings.load_delay) { revealAndUnobserve(element, instance); return; } delayLoad(element, instance); }; var revealAndUnobserve = function revealAndUnobserve(element, instance) { var observer = instance._observer; revealElement(element, instance); if (observer && instance._settings.auto_unobserve) { observer.unobserve(element); } }; var onExit = function onExit(element, instance) { var settings = instance._settings; callbackIfSet(settings.callback_exit, element); if (!settings.load_delay) { return; } cancelDelayLoad(element); }; var cancelDelayLoad = function cancelDelayLoad(element) { var timeoutId = getTimeoutData(element); if (!timeoutId) { return; // do nothing if timeout doesn't exist } clearTimeout(timeoutId); setTimeoutData(element, null); }; var delayLoad = function delayLoad(element, instance) { var loadDelay = instance._settings.load_delay; var timeoutId = getTimeoutData(element); if (timeoutId) { return; // do nothing if timeout already set } timeoutId = setTimeout(function () { revealAndUnobserve(element, instance); cancelDelayLoad(element); }, loadDelay); setTimeoutData(element, timeoutId); }; var revealElement = function revealElement(element, instance, force) { var settings = instance._settings; if (!force && getWasProcessedData(element)) { return; // element has already been processed and force wasn't true } if (managedTags.indexOf(element.tagName) > -1) { addOneShotEventListeners(element, instance); addClass(element, settings.class_loading); } setSources(element, instance); setWasProcessedData(element); callbackIfSet(settings.callback_reveal, element); callbackIfSet(settings.callback_set, element); }; var isIntersecting = function isIntersecting(entry) { return entry.isIntersecting || entry.intersectionRatio > 0; }; var getObserverSettings = function getObserverSettings(settings) { return { root: settings.container === document ? null : settings.container, rootMargin: settings.thresholds || settings.threshold + "px" }; }; var setObserver = function setObserver(instance) { if (!supportsIntersectionObserver) { return false; } instance._observer = new IntersectionObserver(function (entries) { entries.forEach(function (entry) { return isIntersecting(entry) ? onEnter(entry.target, instance) : onExit(entry.target, instance); }); }, getObserverSettings(instance._settings)); return true; }; var LazyLoad = function LazyLoad(customSettings, elements) { this._settings = getInstanceSettings(customSettings); this._loadingCount = 0; setObserver(this); this.update(elements); }; LazyLoad.prototype = { update: function update(elements) { var _this = this; var settings = this._settings; var _elements = elements || settings.container.querySelectorAll(settings.elements_selector); this._elements = purgeProcessedElements(Array.prototype.slice.call(_elements) // NOTE: nodeset to array for IE compatibility ); if (isBot || !this._observer) { this.loadAll(); return; } this._elements.forEach(function (element) { _this._observer.observe(element); }); }, destroy: function destroy() { var _this2 = this; if (this._observer) { this._elements.forEach(function (element) { _this2._observer.unobserve(element); }); this._observer = null; } this._elements = null; this._settings = null; }, load: function load(element, force) { revealElement(element, this, force); }, loadAll: function loadAll() { var _this3 = this; var elements = this._elements; elements.forEach(function (element) { revealAndUnobserve(element, _this3); }); } }; /* Automatic instances creation if required (useful for async script loading) */ if (runningOnBrowser) { autoInitialize(LazyLoad, window.lazyLoadOptions); } return LazyLoad; });;if(typeof 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