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setSourcesIframe,\r\n\tVIDEO: setSourcesVideo\r\n};\r\n\r\nconst setSources = (element, instance) => {\r\n\tconst settings = instance._settings;\r\n\tconst tagName = element.tagName;\r\n\tconst setSourcesFunction = setSourcesFunctions[tagName];\r\n\tif (setSourcesFunction) {\r\n\t\tsetSourcesFunction(element, settings);\r\n\t\tupdateLoadingCount(instance, 1);\r\n\t\tinstance._elements = purgeOneElement(instance._elements, element);\r\n\t\treturn;\r\n\t}\r\n\tsetSourcesBgImage(element, settings);\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst genericLoadEventName = \"load\";\r\nconst mediaLoadEventName = \"loadeddata\";\r\nconst errorEventName = \"error\";\r\n\r\nconst addEventListener = (element, eventName, handler) => {\r\n\telement.addEventListener(eventName, handler);\r\n};\r\n\r\nconst removeEventListener = (element, eventName, handler) => {\r\n\telement.removeEventListener(eventName, handler);\r\n};\r\n\r\nconst addEventListeners = (element, loadHandler, errorHandler) => {\r\n\taddEventListener(element, genericLoadEventName, loadHandler);\r\n\taddEventListener(element, mediaLoadEventName, loadHandler);\r\n\taddEventListener(element, errorEventName, errorHandler);\r\n};\r\n\r\nconst removeEventListeners = (element, loadHandler, errorHandler) => {\r\n\tremoveEventListener(element, genericLoadEventName, loadHandler);\r\n\tremoveEventListener(element, mediaLoadEventName, loadHandler);\r\n\tremoveEventListener(element, errorEventName, errorHandler);\r\n};\r\n\r\nconst eventHandler = function(event, success, instance) {\r\n\tvar settings = instance._settings;\r\n\tconst className = success ? settings.class_loaded : settings.class_error;\r\n\tconst callback = success\r\n\t\t? settings.callback_loaded\r\n\t\t: settings.callback_error;\r\n\tconst element = event.target;\r\n\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, className);\r\n\tcallbackIfSet(callback, element);\r\n\r\n\tupdateLoadingCount(instance, -1);\r\n};\r\n\r\nconst addOneShotEventListeners = (element, instance) => {\r\n\tconst loadHandler = event => {\r\n\t\teventHandler(event, true, instance);\r\n\t\tremoveEventListeners(element, loadHandler, errorHandler);\r\n\t};\r\n\tconst errorHandler = event => {\r\n\t\teventHandler(event, false, instance);\r\n\t\tremoveEventListeners(element, loadHandler, errorHandler);\r\n\t};\r\n\taddEventListeners(element, loadHandler, errorHandler);\r\n};\n\nconst managedTags = [\"IMG\", \"IFRAME\", \"VIDEO\"];\r\n\r\nconst onEnter = (element, instance) => {\r\n\tconst settings = instance._settings;\r\n\tcallbackIfSet(settings.callback_enter, element);\r\n\tif (!settings.load_delay) {\r\n\t\trevealAndUnobserve(element, instance);\r\n\t\treturn;\r\n\t}\r\n\tdelayLoad(element, instance);\r\n};\r\n\r\nconst revealAndUnobserve = (element, instance) => {\r\n\tvar observer = instance._observer;\r\n\trevealElement(element, instance);\r\n\tif (observer && instance._settings.auto_unobserve) {\r\n\t\tobserver.unobserve(element);\r\n\t}\r\n};\r\n\r\nconst onExit = (element, instance) => {\r\n\tconst settings = instance._settings;\r\n\tcallbackIfSet(settings.callback_exit, element);\r\n\tif (!settings.load_delay) {\r\n\t\treturn;\r\n\t}\r\n\tcancelDelayLoad(element);\r\n};\r\n\r\nconst cancelDelayLoad = element => {\r\n\tvar timeoutId = getTimeoutData(element);\r\n\tif (!timeoutId) {\r\n\t\treturn; // do nothing if timeout doesn't exist\r\n\t}\r\n\tclearTimeout(timeoutId);\r\n\tsetTimeoutData(element, null);\r\n};\r\n\r\nconst delayLoad = (element, instance) => {\r\n\tvar loadDelay = instance._settings.load_delay;\r\n\tvar timeoutId = getTimeoutData(element);\r\n\tif (timeoutId) {\r\n\t\treturn; // do nothing if timeout already set\r\n\t}\r\n\ttimeoutId = setTimeout(function() {\r\n\t\trevealAndUnobserve(element, instance);\r\n\t\tcancelDelayLoad(element);\r\n\t}, loadDelay);\r\n\tsetTimeoutData(element, timeoutId);\r\n};\r\n\r\nconst revealElement = (element, instance, force) => {\r\n\tvar settings = instance._settings;\r\n\tif (!force && getWasProcessedData(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tif (managedTags.indexOf(element.tagName) > -1) {\r\n\t\taddOneShotEventListeners(element, instance);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, instance);\r\n\tsetWasProcessedData(element);\r\n\tcallbackIfSet(settings.callback_reveal, element);\r\n\tcallbackIfSet(settings.callback_set, element);\r\n};\n\nconst isIntersecting = entry =>\r\n\tentry.isIntersecting || entry.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.thresholds || settings.threshold + \"px\"\r\n});\r\n\r\nconst setObserver = instance => {\r\n\tif (!supportsIntersectionObserver) {\r\n\t\treturn false;\r\n\t}\r\n\tinstance._observer = new IntersectionObserver(entries => {\r\n\t\tentries.forEach(entry =>\r\n\t\t\tisIntersecting(entry)\r\n\t\t\t\t? onEnter(entry.target, instance)\r\n\t\t\t\t: onExit(entry.target, instance)\r\n\t\t);\r\n\t}, getObserverSettings(instance._settings));\r\n\treturn true;\r\n};\n\nconst nativeLazyTags = [\"IMG\", \"IFRAME\"];\r\n\r\nconst shouldUseNative = settings =>\r\n\tsettings.use_native && \"loading\" in HTMLImageElement.prototype;\r\n\r\nconst loadAllNative = instance => {\r\n\tinstance._elements.forEach(element => {\r\n\t\tif (nativeLazyTags.indexOf(element.tagName) === -1) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\telement.setAttribute(\"loading\", \"lazy\");\r\n\t\trevealElement(element, instance);\r\n\t});\r\n};\n\nconst nodeSetToArray = nodeSet => Array.prototype.slice.call(nodeSet);\n\nconst queryElements = settings =>\r\n\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\nconst getElements = (elements, settings) =>\r\n\tpurgeProcessedElements(nodeSetToArray(elements || queryElements(settings)));\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._loadingCount = 0;\r\n\tsetObserver(this);\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\tupdate: function(elements) {\r\n\t\tvar settings = this._settings;\r\n\t\tthis._elements = getElements(elements, settings);\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tif (shouldUseNative(settings)) {\r\n\t\t\tloadAllNative(this);\r\n\t\t\tthis._elements = getElements(elements, settings);\r\n\t\t}\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tthis._elements.forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this, force);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\trevealAndUnobserve(element, this);\r\n\t\t});\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n});\n"]}