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(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;
var defaultSettings = {
elements_selector: '.lazy',
container: isBot || runningOnBrowser ? document : null,
threshold: 300,
thresholds: null,
data_src: 'src',
data_srcset: 'srcset',
data_sizes: 'sizes',
data_bg: 'bg',
data_bg_hidpi: 'bg-hidpi',
data_bg_multi: 'bg-multi',
data_bg_multi_hidpi: 'bg-multi-hidpi',
data_poster: 'poster',
class_applied: 'applied',
class_loading: 'litespeed-loading',
class_loaded: 'litespeed-loaded', // https://docs.litespeedtech.com/lscache/lscwp/pageopt/#lazy-load-images
class_error: 'error',
class_entered: 'entered',
class_exited: 'exited',
unobserve_completed: true,
unobserve_entered: false,
cancel_on_exit: true,
callback_enter: null,
callback_exit: null,
callback_applied: null,
callback_loading: null,
callback_loaded: null,
callback_error: null,
callback_finish: null,
callback_cancel: null,
use_native: false,
};
var getExtendedSettings = function getExtendedSettings(customSettings) {
return _extends({}, defaultSettings, customSettings);
};
/* 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 addTempImage = function addTempImage(element) {
element.llTempImage = document.createElement('IMG');
};
var deleteTempImage = function deleteTempImage(element) {
delete element.llTempImage;
};
var getTempImage = function getTempImage(element) {
return element.llTempImage;
};
var unobserve = function unobserve(element, instance) {
if (!instance) return;
var observer = instance._observer;
if (!observer) return;
observer.unobserve(element);
};
var resetObserver = function resetObserver(observer) {
observer.disconnect();
};
var unobserveEntered = function unobserveEntered(element, settings, instance) {
if (settings.unobserve_entered) unobserve(element, instance);
};
var updateLoadingCount = function updateLoadingCount(instance, delta) {
if (!instance) return;
instance.loadingCount += delta;
};
var decreaseToLoadCount = function decreaseToLoadCount(instance) {
if (!instance) return;
instance.toLoadCount -= 1;
};
var setToLoadCount = function setToLoadCount(instance, value) {
if (!instance) return;
instance.toLoadCount = value;
};
var isSomethingLoading = function isSomethingLoading(instance) {
return instance.loadingCount > 0;
};
var haveElementsToLoad = function haveElementsToLoad(instance) {
return instance.toLoadCount > 0;
};
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 attrsSrc = [SRC];
var attrsSrcPoster = [SRC, POSTER];
var attrsSrcSrcsetSizes = [SRC, SRCSET, SIZES];
var hasOriginalAttrs = function hasOriginalAttrs(element) {
return !!element[ORIGINALS];
};
var getOriginalAttrs = function getOriginalAttrs(element) {
return element[ORIGINALS];
};
var deleteOriginalAttrs = function deleteOriginalAttrs(element) {
return delete element[ORIGINALS];
}; // ## SAVE ##
var setOriginalsObject = function setOriginalsObject(element, attributes) {
if (hasOriginalAttrs(element)) {
return;
}
var originals = {};
attributes.forEach(function (attribute) {
originals[attribute] = element.getAttribute(attribute);
});
element[ORIGINALS] = originals;
};
var saveOriginalBackgroundStyle = function saveOriginalBackgroundStyle(element) {
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);
attributes.forEach(function (attribute) {
setOrResetAttribute(element, attribute, originals[attribute]);
});
};
var restoreOriginalBgImage = function restoreOriginalBgImage(element) {
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 elementsWithLoadEvent = ['IMG', 'IFRAME', 'VIDEO'];
var hasLoadEvent = function hasLoadEvent(element) {
return elementsWithLoadEvent.indexOf(element.tagName) > -1;
};
var checkFinish = function checkFinish(settings, instance) {
if (instance && !isSomethingLoading(instance) && !haveElementsToLoad(instance)) {
safeCallback(settings.callback_finish, instance);
}
};
var addEventListener = function addEventListener(element, eventName, handler) {
element.addEventListener(eventName, handler);
element.llEvLisnrs[eventName] = handler;
};
var removeEventListener = function removeEventListener(element, eventName, handler) {
element.removeEventListener(eventName, handler);
};
var hasEventListeners = function hasEventListeners(element) {
return !!element.llEvLisnrs;
};
var addEventListeners = function addEventListeners(element, loadHandler, errorHandler) {
if (!hasEventListeners(element)) element.llEvLisnrs = {};
var loadEventName = element.tagName === 'VIDEO' ? 'loadeddata' : 'load';
addEventListener(element, loadEventName, loadHandler);
addEventListener(element, 'error', errorHandler);
};
var removeEventListeners = function removeEventListeners(element) {
if (!hasEventListeners(element)) {
return;
}
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 load = function load(element, settings, instance) {
if (hasLoadEvent(element)) {
loadRegular(element, settings, instance);
} else {
loadBackground(element, settings, instance);
}
};
var loadNative = function loadNative(element, settings, instance) {
element.setAttribute('loading', 'lazy');
addOneShotEventListeners(element, settings, instance);
setSourcesNative(element, settings);
setStatus(element, statusNative);
};
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 restoreImg = function restoreImg(imgEl) {
forEachPictureSource(imgEl, function (sourceEl) {
restoreOriginalAttrs(sourceEl, attrsSrcSrcsetSizes);
});
restoreOriginalAttrs(imgEl, attrsSrcSrcsetSizes);
};
var restoreVideo = function restoreVideo(videoEl) {
forEachVideoSource(videoEl, function (sourceEl) {
restoreOriginalAttrs(sourceEl, attrsSrc);
});
restoreOriginalAttrs(videoEl, attrsSrcPoster);
videoEl.load();
};
var restoreIframe = function restoreIframe(iframeEl) {
restoreOriginalAttrs(iframeEl, attrsSrc);
};
var restoreFunctions = {
IMG: restoreImg,
IFRAME: restoreIframe,
VIDEO: restoreVideo,
};
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);
});
};
var observeElements = function observeElements(observer, elements) {
elements.forEach(function (element) {
observer.observe(element);
});
};
var updateObserver = function updateObserver(observer, elementsToObserve) {
resetObserver(observer);
observeElements(observer, elementsToObserve);
};
var setObserver = function setObserver(settings, instance) {
if (!supportsIntersectionObserver || shouldUseNative(settings)) {
return;
}
instance._observer = new IntersectionObserver(function (entries) {
intersectionHandler(entries, settings, instance);
}, getObserverSettings(settings));
};
var toArray = function toArray(nodeSet) {
return Array.prototype.slice.call(nodeSet);
};
var queryElements = function queryElements(settings) {
return settings.container.querySelectorAll(settings.elements_selector);
};
var excludeManagedElements = function excludeManagedElements(elements) {
return toArray(elements).filter(hasEmptyStatus);
};
var hasError = function hasError(element) {
return hasStatusError(element);
};
var filterErrorElements = function filterErrorElements(elements) {
return toArray(elements).filter(hasError);
};
var getElementsToLoad = function getElementsToLoad(elements, settings) {
return excludeManagedElements(elements || queryElements(settings));
};
var retryLazyLoad = function retryLazyLoad(settings, instance) {
var errorElements = filterErrorElements(queryElements(settings));
errorElements.forEach(function (element) {
removeClass(element, settings.class_error);
resetStatus(element);
});
instance.update();
};
var setOnlineCheck = function setOnlineCheck(settings, instance) {
if (!runningOnBrowser) {
return;
}
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;
var settings = this._settings;
var elementsToLoad = getElementsToLoad(elements, settings);
elementsToLoad.forEach(function (element) {
unobserve(element, _this);
load(element, settings, _this);
});
},
restoreAll: function restoreAll() {
var settings = this._settings;
queryElements(settings).forEach(function (element) {
restore(element, settings);
});
},
};
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;
});