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✏️ Editing: lazyload.lib.js

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined'
		? (module.exports = factory())
		: typeof define === 'function' && define.amd
		? define(factory)
		: ((global = typeof globalThis !== 'undefined' ? globalThis : global || self), (global.LazyLoad = factory()));
})(this, function () {
	'use strict';

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);
	}

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 isHiDpi = runningOnBrowser && window.devicePixelRatio > 1;

/* 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) */

var autoInitialize = 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 SRC = 'src';
	var SRCSET = 'srcset';
	var SIZES = 'sizes';
	var POSTER = 'poster';
	var ORIGINALS = 'llOriginalAttrs';

var statusLoading = 'loading';
	var statusLoaded = 'loaded';
	var statusApplied = 'applied';
	var statusEntered = 'entered';
	var statusError = 'error';
	var statusNative = 'native';

var dataPrefix = 'data-';
	var statusDataName = 'll-status';
	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 getStatus = function getStatus(element) {
		return getData(element, statusDataName);
	};
	var setStatus = function setStatus(element, status) {
		return setData(element, statusDataName, status);
	};
	var resetStatus = function resetStatus(element) {
		return setStatus(element, null);
	};
	var hasEmptyStatus = function hasEmptyStatus(element) {
		return getStatus(element) === null;
	};
	var hasStatusLoading = function hasStatusLoading(element) {
		return getStatus(element) === statusLoading;
	};
	var hasStatusError = function hasStatusError(element) {
		return getStatus(element) === statusError;
	};
	var hasStatusNative = function hasStatusNative(element) {
		return getStatus(element) === statusNative;
	};
	var statusesAfterLoading = [statusLoading, statusLoaded, statusApplied, statusError];
	var hadStartedLoading = function hadStartedLoading(element) {
		return statusesAfterLoading.indexOf(getStatus(element)) >= 0;
	};

var safeCallback = function safeCallback(callback, arg1, arg2, arg3) {
		if (!callback) {
			return;
		}

if (arg3 !== undefined) {
			callback(arg1, arg2, arg3);
			return;
		}

if (arg2 !== undefined) {
			callback(arg1, arg2);
			return;
		}

callback(arg1);
	};

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 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 forEachPictureSource = function forEachPictureSource(element, fn) {
		var parent = element.parentNode;

if (!parent || parent.tagName !== 'PICTURE') {
			return;
		}

var sourceTags = getSourceTags(parent);
		sourceTags.forEach(fn);
	};
	var forEachVideoSource = function forEachVideoSource(element, fn) {
		var sourceTags = getSourceTags(element);
		sourceTags.forEach(fn);
	};

var setOriginalsObject = function setOriginalsObject(element, attributes) {
		if (hasOriginalAttrs(element)) {
			return;
		}

element[ORIGINALS] = {
			backgroundImage: element.style.backgroundImage,
		};
	}; // ## RESTORE ##

var setOrResetAttribute = function setOrResetAttribute(element, attrName, value) {
		if (!value) {
			element.removeAttribute(attrName);
			return;
		}

element.setAttribute(attrName, value);
	};

var restoreOriginalAttrs = function restoreOriginalAttrs(element, attributes) {
		if (!hasOriginalAttrs(element)) {
			return;
		}

var originals = getOriginalAttrs(element);
		element.style.backgroundImage = originals.backgroundImage;
	};

var manageApplied = function manageApplied(element, settings, instance) {
		addClass(element, settings.class_applied);
		setStatus(element, statusApplied); // Instance is not provided when loading is called from static class

if (!instance) return;

if (settings.unobserve_completed) {
			// Unobserve now because we can't do it on load
			unobserve(element, settings);
		}

safeCallback(settings.callback_applied, element, instance);
	};
	var manageLoading = function manageLoading(element, settings, instance) {
		addClass(element, settings.class_loading);
		setStatus(element, statusLoading); // Instance is not provided when loading is called from static class

if (!instance) return;
		updateLoadingCount(instance, +1);
		safeCallback(settings.callback_loading, element, instance);
	};
	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(imgEl, settings) {
		forEachPictureSource(imgEl, function (sourceTag) {
			setOriginalsObject(sourceTag, attrsSrcSrcsetSizes);
			setImageAttributes(sourceTag, settings);
		});
		setOriginalsObject(imgEl, attrsSrcSrcsetSizes);
		setImageAttributes(imgEl, settings);
	};
	var setSourcesIframe = function setSourcesIframe(iframe, settings) {
		setOriginalsObject(iframe, attrsSrc);
		setAttributeIfValue(iframe, SRC, getData(iframe, settings.data_src));
	};
	var setSourcesVideo = function setSourcesVideo(videoEl, settings) {
		forEachVideoSource(videoEl, function (sourceEl) {
			setOriginalsObject(sourceEl, attrsSrc);
			setAttributeIfValue(sourceEl, SRC, getData(sourceEl, settings.data_src));
		});
		setOriginalsObject(videoEl, attrsSrcPoster);
		setAttributeIfValue(videoEl, POSTER, getData(videoEl, settings.data_poster));
		setAttributeIfValue(videoEl, SRC, getData(videoEl, settings.data_src));
		videoEl.load();
	};
	var setBackground = function setBackground(element, settings, instance) {
		var bg1xValue = getData(element, settings.data_bg);
		var bgHiDpiValue = getData(element, settings.data_bg_hidpi);
		var bgDataValue = isHiDpi && bgHiDpiValue ? bgHiDpiValue : bg1xValue;
		if (!bgDataValue) return;
		element.style.backgroundImage = 'url("'.concat(bgDataValue, '")');
		getTempImage(element).setAttribute(SRC, bgDataValue);
		manageLoading(element, settings, instance);
	}; // NOTE: THE TEMP IMAGE TRICK CANNOT BE DONE WITH data-multi-bg
	// BECAUSE INSIDE ITS VALUES MUST BE WRAPPED WITH URL() AND ONE OF THEM
	// COULD BE A GRADIENT BACKGROUND IMAGE

var setMultiBackground = function setMultiBackground(element, settings, instance) {
		var bg1xValue = getData(element, settings.data_bg_multi);
		var bgHiDpiValue = getData(element, settings.data_bg_multi_hidpi);
		var bgDataValue = isHiDpi && bgHiDpiValue ? bgHiDpiValue : bg1xValue;

if (!bgDataValue) {
			return;
		}

element.style.backgroundImage = bgDataValue;
		manageApplied(element, settings, instance);
	};
	var setSourcesFunctions = {
		IMG: setSourcesImg,
		IFRAME: setSourcesIframe,
		VIDEO: setSourcesVideo,
	};
	var setSourcesNative = function setSourcesNative(element, settings) {
		var setSourcesFunction = setSourcesFunctions[element.tagName];

if (!setSourcesFunction) {
			return;
		}

setSourcesFunction(element, settings);
	};
	var setSources = function setSources(element, settings, instance) {
		var setSourcesFunction = setSourcesFunctions[element.tagName];

if (!setSourcesFunction) {
			return;
		}

setSourcesFunction(element, settings);
		manageLoading(element, settings, instance);
	};

var eventListeners = element.llEvLisnrs;

for (var eventName in eventListeners) {
			var handler = eventListeners[eventName];
			removeEventListener(element, eventName, handler);
		}

delete element.llEvLisnrs;
	};
	var doneHandler = function doneHandler(element, settings, instance) {
		deleteTempImage(element);
		updateLoadingCount(instance, -1);
		decreaseToLoadCount(instance);
		removeClass(element, settings.class_loading);

if (settings.unobserve_completed) {
			unobserve(element, instance);
		}
	};
	var loadHandler = function loadHandler(event, element, settings, instance) {
		var goingNative = hasStatusNative(element);
		doneHandler(element, settings, instance);
		addClass(element, settings.class_loaded);
		setStatus(element, statusLoaded);
		safeCallback(settings.callback_loaded, element, instance);
		if (!goingNative) checkFinish(settings, instance);
	};
	var errorHandler = function errorHandler(event, element, settings, instance) {
		var goingNative = hasStatusNative(element);
		doneHandler(element, settings, instance);
		addClass(element, settings.class_error);
		setStatus(element, statusError);
		safeCallback(settings.callback_error, element, instance);
		if (!goingNative) checkFinish(settings, instance);
	};
	var addOneShotEventListeners = function addOneShotEventListeners(element, settings, instance) {
		var elementToListenTo = getTempImage(element) || element;

if (hasEventListeners(elementToListenTo)) {
			// This happens when loading is retried twice
			return;
		}

var _loadHandler = function _loadHandler(event) {
			loadHandler(event, element, settings, instance);
			removeEventListeners(elementToListenTo);
		};

var _errorHandler = function _errorHandler(event) {
			errorHandler(event, element, settings, instance);
			removeEventListeners(elementToListenTo);
		};

addEventListeners(elementToListenTo, _loadHandler, _errorHandler);
	};

var loadBackground = function loadBackground(element, settings, instance) {
		addTempImage(element);
		addOneShotEventListeners(element, settings, instance);
		saveOriginalBackgroundStyle(element);
		setBackground(element, settings, instance);
		setMultiBackground(element, settings, instance);
	};

var loadRegular = function loadRegular(element, settings, instance) {
		addOneShotEventListeners(element, settings, instance);
		setSources(element, settings, instance);
	};

var removeImageAttributes = function removeImageAttributes(element) {
		element.removeAttribute(SRC);
		element.removeAttribute(SRCSET);
		element.removeAttribute(SIZES);
	};

var resetSourcesImg = function resetSourcesImg(element) {
		forEachPictureSource(element, function (sourceTag) {
			removeImageAttributes(sourceTag);
		});
		removeImageAttributes(element);
	};

var restoreAttributes = function restoreAttributes(element) {
		var restoreFunction = restoreFunctions[element.tagName];

if (!restoreFunction) {
			restoreOriginalBgImage(element);
			return;
		}

restoreFunction(element);
	};

var resetClasses = function resetClasses(element, settings) {
		if (hasEmptyStatus(element) || hasStatusNative(element)) {
			return;
		}

removeClass(element, settings.class_entered);
		removeClass(element, settings.class_exited);
		removeClass(element, settings.class_applied);
		removeClass(element, settings.class_loading);
		removeClass(element, settings.class_loaded);
		removeClass(element, settings.class_error);
	};

var restore = function restore(element, settings) {
		restoreAttributes(element);
		resetClasses(element, settings);
		resetStatus(element);
		deleteOriginalAttrs(element);
	};

var cancelLoading = function cancelLoading(element, entry, settings, instance) {
		if (!settings.cancel_on_exit) return;
		if (!hasStatusLoading(element)) return;
		if (element.tagName !== 'IMG') return; //Works only on images

removeEventListeners(element);
		resetSourcesImg(element);
		restoreImg(element);
		removeClass(element, settings.class_loading);
		updateLoadingCount(instance, -1);
		resetStatus(element);
		safeCallback(settings.callback_cancel, element, entry, instance);
	};

var onEnter = function onEnter(element, entry, settings, instance) {
		var dontLoad = hadStartedLoading(element);
		/* Save status
    before setting it, to prevent loading it again. Fixes #526. */

setStatus(element, statusEntered);
		addClass(element, settings.class_entered);
		removeClass(element, settings.class_exited);
		unobserveEntered(element, settings, instance);
		safeCallback(settings.callback_enter, element, entry, instance);
		if (dontLoad) return;
		load(element, settings, instance);
	};
	var onExit = function onExit(element, entry, settings, instance) {
		if (hasEmptyStatus(element)) return; //Ignore the first pass, at landing

addClass(element, settings.class_exited);
		cancelLoading(element, entry, settings, instance);
		safeCallback(settings.callback_exit, element, entry, instance);
	};

var tagsWithNativeLazy = ['IMG', 'IFRAME', 'VIDEO'];
	var shouldUseNative = function shouldUseNative(settings) {
		return settings.use_native && 'loading' in HTMLImageElement.prototype;
	};
	var loadAllNative = function loadAllNative(elements, settings, instance) {
		elements.forEach(function (element) {
			if (tagsWithNativeLazy.indexOf(element.tagName) === -1) {
				return;
			}

loadNative(element, settings, instance);
		});
		setToLoadCount(instance, 0);
	};

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 intersectionHandler = function intersectionHandler(entries, settings, instance) {
		entries.forEach(function (entry) {
			return isIntersecting(entry) ? onEnter(entry.target, entry, settings, instance) : onExit(entry.target, entry, settings, instance);
		});
	};

instance._observer = new IntersectionObserver(function (entries) {
			intersectionHandler(entries, settings, instance);
		}, getObserverSettings(settings));
	};

window.addEventListener('online', function () {
			retryLazyLoad(settings, instance);
		});
	};

var LazyLoad = function LazyLoad(customSettings, elements) {
		var settings = getExtendedSettings(customSettings);
		this._settings = settings;
		this.loadingCount = 0;
		setObserver(settings, this);
		setOnlineCheck(settings, this);
		this.update(elements);
	};

LazyLoad.prototype = {
		update: function update(givenNodeset) {
			var settings = this._settings;
			var elementsToLoad = getElementsToLoad(givenNodeset, settings);
			setToLoadCount(this, elementsToLoad.length);

if (isBot || !supportsIntersectionObserver) {
				this.loadAll(elementsToLoad);
				return;
			}

if (shouldUseNative(settings)) {
				loadAllNative(elementsToLoad, settings, this);
				return;
			}

updateObserver(this._observer, elementsToLoad);
		},
		destroy: function destroy() {
			// Observer
			if (this._observer) {
				this._observer.disconnect();
			} // Clean custom attributes on elements

queryElements(this._settings).forEach(function (element) {
				deleteOriginalAttrs(element);
			}); // Delete all internal props

delete this._observer;
			delete this._settings;
			delete this.loadingCount;
			delete this.toLoadCount;
		},
		loadAll: function loadAll(elements) {
			var _this = this;

LazyLoad.load = function (element, customSettings) {
		var settings = getExtendedSettings(customSettings);
		load(element, settings);
	};

LazyLoad.resetStatus = function (element) {
		resetStatus(element);
	}; // Automatic instances creation if required (useful for async script loading)

// if (runningOnBrowser) {
	// 	autoInitialize(LazyLoad, window.lazyLoadOptions);
	// }

return LazyLoad;
});