File: //proc/self/cwd/wp-content/plugins/litespeed-cache/assets/js/lazyload.lib.js
var _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; };
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : 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 defaultSettings = {
elements_selector: "img",
container: document,
threshold: 300,
thresholds: null,
data_src: "src",
data_srcset: "srcset",
data_sizes: "sizes",
data_bg: "bg",
class_loading: "litespeed-loading",
class_loaded: "litespeed-loaded",
class_error: "error",
load_delay: 0,
callback_load: null,
callback_error: null,
callback_set: null,
callback_enter: null,
callback_finish: null,
to_webp: false
};
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 replaceExtToWebp = function replaceExtToWebp(value, condition) {
return condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
};
var detectWebp = function detectWebp() {
// var webpString = "image/webp";
// var canvas = document.createElement("canvas");
// if (canvas.getContext && canvas.getContext("2d")) {
// return canvas.toDataURL(webpString).indexOf('data:' + webpString) === 0;
// }
return false;
};
var runningOnBrowser = typeof window !== "undefined";
var isBot = runningOnBrowser && !("onscroll" in window) || /(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 supportsWebp = runningOnBrowser && detectWebp();
var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName, toWebpFlag) {
for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) {
if (childTag.tagName === "SOURCE") {
var attrValue = getData(childTag, dataAttrName);
setAttributeIfValue(childTag, attrName, attrValue, toWebpFlag);
}
}
};
var setAttributeIfValue = function setAttributeIfValue(element, attrName, value, toWebpFlag) {
if (!value) {
return;
}
element.setAttribute(attrName, replaceExtToWebp(value, toWebpFlag));
};
var setSourcesImg = function setSourcesImg(element, settings) {
var toWebpFlag = supportsWebp && settings.to_webp;
var srcsetDataName = settings.data_srcset;
var parent = element.parentNode;
if (parent && parent.tagName === "PICTURE") {
setSourcesInChildren(parent, "srcset", srcsetDataName, toWebpFlag);
}
var sizesDataValue = getData(element, settings.data_sizes);
setAttributeIfValue(element, "sizes", sizesDataValue);
var srcsetDataValue = getData(element, srcsetDataName);
setAttributeIfValue(element, "srcset", srcsetDataValue, toWebpFlag);
var srcDataValue = getData(element, settings.data_src);
setAttributeIfValue(element, "src", srcDataValue, toWebpFlag);
};
var setSourcesIframe = function setSourcesIframe(element, settings) {
var srcDataValue = getData(element, settings.data_src);
setAttributeIfValue(element, "src", srcDataValue);
};
var setSourcesVideo = function setSourcesVideo(element, settings) {
var srcDataName = settings.data_src;
var srcDataValue = getData(element, srcDataName);
setSourcesInChildren(element, "src", srcDataName);
setAttributeIfValue(element, "src", srcDataValue);
element.load();
};
var setSourcesBgImage = function setSourcesBgImage(element, settings) {
var toWebpFlag = supportsWebp && settings.to_webp;
var srcDataValue = getData(element, settings.data_src);
var bgDataValue = getData(element, settings.data_bg);
if (srcDataValue) {
var setValue = replaceExtToWebp(srcDataValue, toWebpFlag);
element.style.backgroundImage = 'url("' + setValue + '")';
}
if (bgDataValue) {
var _setValue = replaceExtToWebp(bgDataValue, toWebpFlag);
element.style.backgroundImage = _setValue;
}
};
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);
instance._updateLoadingCount(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 callbackIfSet = function callbackIfSet(callback, argument) {
if (callback) {
callback(argument);
}
};
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_load : settings.callback_error;
var element = event.target;
removeClass(element, settings.class_loading);
addClass(element, className);
callbackIfSet(callback, element);
instance._updateLoadingCount(-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 loadAndUnobserve = function loadAndUnobserve(element, observer, instance) {
revealElement(element, instance);
observer.unobserve(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, observer, instance) {
var loadDelay = instance._settings.load_delay;
var timeoutId = getTimeoutData(element);
if (timeoutId) {
return; // do nothing if timeout already set
}
timeoutId = setTimeout(function () {
loadAndUnobserve(element, observer, instance);
cancelDelayLoad(element);
}, loadDelay);
setTimeoutData(element, timeoutId);
};
function revealElement(element, instance, force) {
var settings = instance._settings;
if (!force && getWasProcessedData(element)) {
return; // element has already been processed and force wasn't true
}
callbackIfSet(settings.callback_enter, element);
if (managedTags.indexOf(element.tagName) > -1) {
addOneShotEventListeners(element, instance);
addClass(element, settings.class_loading);
}
setSources(element, instance);
setWasProcessedData(element);
callbackIfSet(settings.callback_set, element);
}
/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and
entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */
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 LazyLoad = function LazyLoad(customSettings, elements) {
this._settings = getInstanceSettings(customSettings);
this._setObserver();
this._loadingCount = 0;
this.update(elements);
};
LazyLoad.prototype = {
_manageIntersection: function _manageIntersection(entry) {
var observer = this._observer;
var loadDelay = this._settings.load_delay;
var element = entry.target;
// WITHOUT LOAD DELAY
if (!loadDelay) {
if (isIntersecting(entry)) {
loadAndUnobserve(element, observer, this);
}
return;
}
// WITH LOAD DELAY
if (isIntersecting(entry)) {
delayLoad(element, observer, this);
} else {
cancelDelayLoad(element);
}
},
_onIntersection: function _onIntersection(entries) {
entries.forEach(this._manageIntersection.bind(this));
},
_setObserver: function _setObserver() {
if (!supportsIntersectionObserver) {
return;
}
this._observer = new IntersectionObserver(this._onIntersection.bind(this), getObserverSettings(this._settings));
},
_updateLoadingCount: function _updateLoadingCount(plusMinus) {
this._loadingCount += plusMinus;
if (this._elements.length === 0 && this._loadingCount === 0) {
callbackIfSet(this._settings.callback_finish);
}
},
update: function update(elements) {
var _this = this;
var settings = this._settings;
var nodeSet = elements || settings.container.querySelectorAll(settings.elements_selector);
this._elements = purgeProcessedElements(Array.prototype.slice.call(nodeSet) // 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) {
_this3.load(element);
});
}
};
/* Automatic instances creation if required (useful for async script loading) */
if (runningOnBrowser) {
autoInitialize(LazyLoad, window.lazyLoadOptions);
}
return LazyLoad;
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