%PDF-
%PDF-
Mini Shell
Mini Shell
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = 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: "IMG",
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: "loading",
class_loaded: "loaded",
class_error: "error",
unobserve_completed: true,
unobserve_entered: false,
cancel_on_exit: false,
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 statusLoading = "loading";
var statusLoaded = "loaded";
var statusApplied = "applied";
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 hadStartedLoading = function hadStartedLoading(element) {
return !hasEmptyStatus(element);
};
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 unobserveIfRequired = function unobserveIfRequired(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 setAttributeIfValue = function setAttributeIfValue(element, attrName, value) {
if (!value) {
return;
}
element.setAttribute(attrName, value);
};
var resetAttribute = function resetAttribute(element, attrName) {
element.removeAttribute(attrName);
};
var hasOriginalAttributes = function hasOriginalAttributes(element) {
return !!element.llOriginalAttrs;
};
var saveOriginalImageAttributes = function saveOriginalImageAttributes(element) {
if (hasOriginalAttributes(element)) {
return;
}
var originalAttributes = {};
originalAttributes["src"] = element.getAttribute("src");
originalAttributes["srcset"] = element.getAttribute("srcset");
originalAttributes["sizes"] = element.getAttribute("sizes");
element.llOriginalAttrs = originalAttributes;
};
var restoreOriginalImageAttributes = function restoreOriginalImageAttributes(element) {
if (!hasOriginalAttributes(element)) {
return;
}
var originalAttributes = element.llOriginalAttrs;
setAttributeIfValue(element, "src", originalAttributes["src"]);
setAttributeIfValue(element, "srcset", originalAttributes["srcset"]);
setAttributeIfValue(element, "sizes", originalAttributes["sizes"]);
};
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 resetImageAttributes = function resetImageAttributes(element) {
resetAttribute(element, "src");
resetAttribute(element, "srcset");
resetAttribute(element, "sizes");
};
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 restoreOriginalAttributesImg = function restoreOriginalAttributesImg(element) {
forEachPictureSource(element, function (sourceTag) {
restoreOriginalImageAttributes(sourceTag);
});
restoreOriginalImageAttributes(element);
};
var setSourcesImg = function setSourcesImg(element, settings) {
forEachPictureSource(element, function (sourceTag) {
saveOriginalImageAttributes(sourceTag);
setImageAttributes(sourceTag, settings);
});
saveOriginalImageAttributes(element);
setImageAttributes(element, settings);
};
var resetSourcesImg = function resetSourcesImg(element) {
forEachPictureSource(element, function (sourceTag) {
resetImageAttributes(sourceTag);
});
resetImageAttributes(element);
};
var setSourcesIframe = function setSourcesIframe(element, settings) {
setAttributeIfValue(element, "src", getData(element, settings.data_src));
};
var setSourcesVideo = function setSourcesVideo(element, settings) {
forEachVideoSource(element, function (sourceTag) {
setAttributeIfValue(sourceTag, "src", getData(sourceTag, settings.data_src));
});
setAttributeIfValue(element, "poster", getData(element, settings.data_poster));
setAttributeIfValue(element, "src", getData(element, settings.data_src));
element.load();
};
var setSourcesFunctions = {
IMG: setSourcesImg,
IFRAME: setSourcesIframe,
VIDEO: setSourcesVideo
};
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 setSources = function setSources(element, settings) {
var setSourcesFunction = setSourcesFunctions[element.tagName];
if (!setSourcesFunction) {
return;
}
setSourcesFunction(element, settings);
};
var manageApplied = function manageApplied(element, settings, instance) {
addClass(element, settings.class_applied);
setStatus(element, statusApplied);
removeDataMultiBackground(element, settings);
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) {
updateLoadingCount(instance, +1);
addClass(element, settings.class_loading);
setStatus(element, statusLoading);
safeCallback(settings.callback_loading, element, instance);
}; // REMOVE DATA ATTRIBUTES --------------
var removeDataImg = function removeDataImg(element, settings) {
setData(element, settings.data_src, null);
setData(element, settings.data_srcset, null);
setData(element, settings.data_sizes, null);
forEachPictureSource(element, function (sourceTag) {
setData(sourceTag, settings.data_srcset, null);
setData(sourceTag, settings.data_sizes, null);
});
};
var removeDataIframe = function removeDataIframe(element, settings) {
setData(element, settings.data_src, null);
};
var removeDataVideo = function removeDataVideo(element, settings) {
setData(element, settings.data_src, null);
setData(element, settings.data_poster, null);
forEachVideoSource(element, function (sourceTag) {
setData(sourceTag, settings.data_src, null);
});
};
var removeDataFunctions = {
IMG: removeDataImg,
IFRAME: removeDataIframe,
VIDEO: removeDataVideo
};
var removeDataBackground = function removeDataBackground(element, settings) {
setData(element, settings.data_bg, null);
setData(element, settings.data_bg_hidpi, null);
};
var removeDataMultiBackground = function removeDataMultiBackground(element, settings) {
setData(element, settings.data_bg_multi, null);
setData(element, settings.data_bg_multi_hidpi, null);
};
var removeDataAttributes = function removeDataAttributes(element, settings) {
var removeDataFunction = removeDataFunctions[element.tagName];
if (removeDataFunction) {
removeDataFunction(element, settings);
return;
}
removeDataBackground(element, settings);
};
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);
removeDataAttributes(element, settings);
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);
setBackground(element, settings, instance);
setMultiBackground(element, settings, instance);
};
var loadRegular = function loadRegular(element, settings, instance) {
addOneShotEventListeners(element, settings, instance);
setSources(element, settings);
manageLoading(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) {
addOneShotEventListeners(element, settings, instance);
setSources(element, settings);
removeDataAttributes(element, settings);
setStatus(element, statusNative);
};
var cancelLoadingIfRequired = function cancelLoadingIfRequired(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);
restoreOriginalAttributesImg(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) {
safeCallback(settings.callback_enter, element, entry, instance);
unobserveIfRequired(element, settings, instance);
if (hadStartedLoading(element)) return; //Prevent loading it again
load(element, settings, instance);
};
var onExit = function onExit(element, entry, settings, instance) {
if (hasEmptyStatus(element)) return; //Ignore the first pass, at landing
cancelLoadingIfRequired(element, entry, settings, instance);
safeCallback(settings.callback_exit, element, entry, instance);
};
var tagsWithNativeLazy = ["IMG", "IFRAME"];
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;
}
element.setAttribute("loading", "lazy"); //TODO: Move inside the loadNative method
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) {
delete element.llOriginalAttrs;
}); // 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) {
load(element, settings, _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;
})));
Zerion Mini Shell 1.0