860 lines
27 KiB
JavaScript
860 lines
27 KiB
JavaScript
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var LazyLoad = (function () {
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'use strict';
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function _extends() {
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_extends = Object.assign || function (target) {
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for (var i = 1; i < arguments.length; i++) {
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var source = arguments[i];
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for (var key in source) {
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if (Object.prototype.hasOwnProperty.call(source, key)) {
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target[key] = source[key];
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}
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}
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}
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return target;
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};
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return _extends.apply(this, arguments);
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}
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var runningOnBrowser = typeof window !== "undefined";
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var isBot = runningOnBrowser && !("onscroll" in window) || typeof navigator !== "undefined" && /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
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var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
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var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
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var isHiDpi = runningOnBrowser && window.devicePixelRatio > 1;
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var defaultSettings = {
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elements_selector: ".lazy",
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container: isBot || runningOnBrowser ? document : null,
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threshold: 300,
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thresholds: null,
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data_src: "src",
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data_srcset: "srcset",
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data_sizes: "sizes",
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data_bg: "bg",
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data_bg_hidpi: "bg-hidpi",
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data_bg_multi: "bg-multi",
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data_bg_multi_hidpi: "bg-multi-hidpi",
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data_bg_set: "bg-set",
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data_poster: "poster",
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class_applied: "applied",
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class_loading: "loading",
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class_loaded: "loaded",
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class_error: "error",
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class_entered: "entered",
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class_exited: "exited",
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unobserve_completed: true,
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unobserve_entered: false,
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cancel_on_exit: true,
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callback_enter: null,
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callback_exit: null,
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callback_applied: null,
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callback_loading: null,
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callback_loaded: null,
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callback_error: null,
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callback_finish: null,
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callback_cancel: null,
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use_native: false,
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restore_on_error: false
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};
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var getExtendedSettings = function getExtendedSettings(customSettings) {
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return _extends({}, defaultSettings, customSettings);
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};
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/* Creates instance and notifies it through the window element */
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var createInstance = function createInstance(classObj, options) {
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var event;
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var eventString = "LazyLoad::Initialized";
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var instance = new classObj(options);
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try {
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// Works in modern browsers
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event = new CustomEvent(eventString, {
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detail: {
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instance: instance
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}
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});
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} catch (err) {
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// Works in Internet Explorer (all versions)
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event = document.createEvent("CustomEvent");
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event.initCustomEvent(eventString, false, false, {
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instance: instance
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});
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}
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window.dispatchEvent(event);
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};
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/* Auto initialization of one or more instances of lazyload, depending on the
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options passed in (plain object or an array) */
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var autoInitialize = function autoInitialize(classObj, options) {
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if (!options) {
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return;
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}
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if (!options.length) {
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// Plain object
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createInstance(classObj, options);
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} else {
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// Array of objects
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for (var i = 0, optionsItem; optionsItem = options[i]; i += 1) {
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createInstance(classObj, optionsItem);
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}
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}
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};
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var SRC = "src";
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var SRCSET = "srcset";
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var SIZES = "sizes";
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var POSTER = "poster";
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var ORIGINALS = "llOriginalAttrs";
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var DATA = "data";
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var statusLoading = "loading";
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var statusLoaded = "loaded";
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var statusApplied = "applied";
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var statusEntered = "entered";
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var statusError = "error";
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var statusNative = "native";
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var dataPrefix = "data-";
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var statusDataName = "ll-status";
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var getData = function getData(element, attribute) {
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return element.getAttribute(dataPrefix + attribute);
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};
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var setData = function setData(element, attribute, value) {
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var attrName = dataPrefix + attribute;
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if (value === null) {
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element.removeAttribute(attrName);
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return;
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}
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element.setAttribute(attrName, value);
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};
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var getStatus = function getStatus(element) {
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return getData(element, statusDataName);
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};
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var setStatus = function setStatus(element, status) {
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return setData(element, statusDataName, status);
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};
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var resetStatus = function resetStatus(element) {
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return setStatus(element, null);
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};
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var hasEmptyStatus = function hasEmptyStatus(element) {
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return getStatus(element) === null;
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};
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var hasStatusLoading = function hasStatusLoading(element) {
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return getStatus(element) === statusLoading;
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};
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var hasStatusError = function hasStatusError(element) {
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return getStatus(element) === statusError;
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};
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var hasStatusNative = function hasStatusNative(element) {
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return getStatus(element) === statusNative;
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};
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var statusesAfterLoading = [statusLoading, statusLoaded, statusApplied, statusError];
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var hadStartedLoading = function hadStartedLoading(element) {
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return statusesAfterLoading.indexOf(getStatus(element)) >= 0;
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};
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var safeCallback = function safeCallback(callback, arg1, arg2, arg3) {
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if (!callback) {
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return;
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}
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if (arg3 !== undefined) {
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callback(arg1, arg2, arg3);
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return;
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}
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if (arg2 !== undefined) {
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callback(arg1, arg2);
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return;
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}
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callback(arg1);
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};
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var addClass = function addClass(element, className) {
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if (supportsClassList) {
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element.classList.add(className);
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return;
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}
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element.className += (element.className ? " " : "") + className;
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};
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var removeClass = function removeClass(element, className) {
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if (supportsClassList) {
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element.classList.remove(className);
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return;
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}
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element.className = element.className.replace(new RegExp("(^|\\s+)" + className + "(\\s+|$)"), " ").replace(/^\s+/, "").replace(/\s+$/, "");
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};
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var addTempImage = function addTempImage(element) {
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element.llTempImage = document.createElement("IMG");
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};
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var deleteTempImage = function deleteTempImage(element) {
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delete element.llTempImage;
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};
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var getTempImage = function getTempImage(element) {
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return element.llTempImage;
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};
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var unobserve = function unobserve(element, instance) {
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if (!instance) return;
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var observer = instance._observer;
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if (!observer) return;
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observer.unobserve(element);
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};
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var resetObserver = function resetObserver(observer) {
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observer.disconnect();
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};
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var unobserveEntered = function unobserveEntered(element, settings, instance) {
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if (settings.unobserve_entered) unobserve(element, instance);
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};
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var updateLoadingCount = function updateLoadingCount(instance, delta) {
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if (!instance) return;
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instance.loadingCount += delta;
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};
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var decreaseToLoadCount = function decreaseToLoadCount(instance) {
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if (!instance) return;
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instance.toLoadCount -= 1;
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};
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var setToLoadCount = function setToLoadCount(instance, value) {
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if (!instance) return;
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instance.toLoadCount = value;
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};
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var isSomethingLoading = function isSomethingLoading(instance) {
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return instance.loadingCount > 0;
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};
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var haveElementsToLoad = function haveElementsToLoad(instance) {
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return instance.toLoadCount > 0;
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};
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var getSourceTags = function getSourceTags(parentTag) {
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var sourceTags = [];
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for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) {
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if (childTag.tagName === "SOURCE") {
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sourceTags.push(childTag);
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}
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}
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return sourceTags;
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};
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var forEachPictureSource = function forEachPictureSource(element, fn) {
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var parent = element.parentNode;
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if (!parent || parent.tagName !== "PICTURE") {
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return;
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}
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var sourceTags = getSourceTags(parent);
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sourceTags.forEach(fn);
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};
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var forEachVideoSource = function forEachVideoSource(element, fn) {
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var sourceTags = getSourceTags(element);
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sourceTags.forEach(fn);
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};
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var attrsSrc = [SRC];
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var attrsSrcPoster = [SRC, POSTER];
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var attrsSrcSrcsetSizes = [SRC, SRCSET, SIZES];
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var attrsData = [DATA];
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var hasOriginalAttrs = function hasOriginalAttrs(element) {
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return !!element[ORIGINALS];
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};
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var getOriginalAttrs = function getOriginalAttrs(element) {
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return element[ORIGINALS];
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};
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var deleteOriginalAttrs = function deleteOriginalAttrs(element) {
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return delete element[ORIGINALS];
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}; // ## SAVE ##
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var setOriginalsObject = function setOriginalsObject(element, attributes) {
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if (hasOriginalAttrs(element)) {
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return;
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}
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var originals = {};
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attributes.forEach(function (attribute) {
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originals[attribute] = element.getAttribute(attribute);
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});
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element[ORIGINALS] = originals;
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};
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var saveOriginalBackgroundStyle = function saveOriginalBackgroundStyle(element) {
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if (hasOriginalAttrs(element)) {
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return;
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}
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element[ORIGINALS] = {
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backgroundImage: element.style.backgroundImage
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};
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}; // ## RESTORE ##
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var setOrResetAttribute = function setOrResetAttribute(element, attrName, value) {
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if (!value) {
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element.removeAttribute(attrName);
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return;
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}
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element.setAttribute(attrName, value);
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};
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var restoreOriginalAttrs = function restoreOriginalAttrs(element, attributes) {
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if (!hasOriginalAttrs(element)) {
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return;
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}
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var originals = getOriginalAttrs(element);
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attributes.forEach(function (attribute) {
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setOrResetAttribute(element, attribute, originals[attribute]);
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});
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};
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var restoreOriginalBgImage = function restoreOriginalBgImage(element) {
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if (!hasOriginalAttrs(element)) {
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return;
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}
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var originals = getOriginalAttrs(element);
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element.style.backgroundImage = originals.backgroundImage;
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};
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var manageApplied = function manageApplied(element, settings, instance) {
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addClass(element, settings.class_applied);
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setStatus(element, statusApplied); // Instance is not provided when loading is called from static class
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if (!instance) return;
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if (settings.unobserve_completed) {
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// Unobserve now because we can't do it on load
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unobserve(element, settings);
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}
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safeCallback(settings.callback_applied, element, instance);
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};
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var manageLoading = function manageLoading(element, settings, instance) {
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addClass(element, settings.class_loading);
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setStatus(element, statusLoading); // Instance is not provided when loading is called from static class
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if (!instance) return;
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updateLoadingCount(instance, +1);
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safeCallback(settings.callback_loading, element, instance);
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};
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var setAttributeIfValue = function setAttributeIfValue(element, attrName, value) {
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if (!value) {
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return;
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}
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element.setAttribute(attrName, value);
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};
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var setImageAttributes = function setImageAttributes(element, settings) {
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setAttributeIfValue(element, SIZES, getData(element, settings.data_sizes));
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setAttributeIfValue(element, SRCSET, getData(element, settings.data_srcset));
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setAttributeIfValue(element, SRC, getData(element, settings.data_src));
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};
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var setSourcesImg = function setSourcesImg(imgEl, settings) {
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forEachPictureSource(imgEl, function (sourceTag) {
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setOriginalsObject(sourceTag, attrsSrcSrcsetSizes);
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setImageAttributes(sourceTag, settings);
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});
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setOriginalsObject(imgEl, attrsSrcSrcsetSizes);
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setImageAttributes(imgEl, settings);
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};
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var setSourcesIframe = function setSourcesIframe(iframe, settings) {
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setOriginalsObject(iframe, attrsSrc);
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setAttributeIfValue(iframe, SRC, getData(iframe, settings.data_src));
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};
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var setSourcesVideo = function setSourcesVideo(videoEl, settings) {
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forEachVideoSource(videoEl, function (sourceEl) {
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setOriginalsObject(sourceEl, attrsSrc);
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setAttributeIfValue(sourceEl, SRC, getData(sourceEl, settings.data_src));
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});
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setOriginalsObject(videoEl, attrsSrcPoster);
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setAttributeIfValue(videoEl, POSTER, getData(videoEl, settings.data_poster));
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setAttributeIfValue(videoEl, SRC, getData(videoEl, settings.data_src));
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videoEl.load();
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};
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var setSourcesObject = function setSourcesObject(object, settings) {
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|
setOriginalsObject(object, attrsData);
|
||
|
|
setAttributeIfValue(object, DATA, getData(object, settings.data_src));
|
||
|
|
};
|
||
|
|
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 setImgsetBackground = function setImgsetBackground(element, settings, instance) {
|
||
|
|
var bgImgSetDataValue = getData(element, settings.data_bg_set);
|
||
|
|
|
||
|
|
if (!bgImgSetDataValue) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var imgSetValues = bgImgSetDataValue.split("|");
|
||
|
|
var bgImageValues = imgSetValues.map(function (value) {
|
||
|
|
return "image-set(".concat(value, ")");
|
||
|
|
});
|
||
|
|
element.style.backgroundImage = bgImageValues.join(); // Temporary fix for Chromeium with the -webkit- prefix
|
||
|
|
|
||
|
|
if (element.style.backgroundImage === '') {
|
||
|
|
bgImageValues = imgSetValues.map(function (value) {
|
||
|
|
return "-webkit-image-set(".concat(value, ")");
|
||
|
|
});
|
||
|
|
element.style.backgroundImage = bgImageValues.join();
|
||
|
|
}
|
||
|
|
|
||
|
|
manageApplied(element, settings, instance);
|
||
|
|
};
|
||
|
|
var setSourcesFunctions = {
|
||
|
|
IMG: setSourcesImg,
|
||
|
|
IFRAME: setSourcesIframe,
|
||
|
|
VIDEO: setSourcesVideo,
|
||
|
|
OBJECT: setSourcesObject
|
||
|
|
};
|
||
|
|
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", "OBJECT"];
|
||
|
|
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 (settings.restore_on_error) restoreOriginalAttrs(element, attrsSrcSrcsetSizes);
|
||
|
|
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);
|
||
|
|
setImgsetBackground(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 restoreObject = function restoreObject(objectEl) {
|
||
|
|
restoreOriginalAttrs(objectEl, attrsData);
|
||
|
|
};
|
||
|
|
var restoreFunctions = {
|
||
|
|
IMG: restoreImg,
|
||
|
|
IFRAME: restoreIframe,
|
||
|
|
VIDEO: restoreVideo,
|
||
|
|
OBJECT: restoreObject
|
||
|
|
};
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
instance._onlineHandler = function () {
|
||
|
|
retryLazyLoad(settings, instance);
|
||
|
|
};
|
||
|
|
|
||
|
|
window.addEventListener("online", instance._onlineHandler);
|
||
|
|
};
|
||
|
|
var resetOnlineCheck = function resetOnlineCheck(instance) {
|
||
|
|
if (!runningOnBrowser) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
window.removeEventListener("online", instance._onlineHandler);
|
||
|
|
};
|
||
|
|
|
||
|
|
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 handlers
|
||
|
|
|
||
|
|
|
||
|
|
resetOnlineCheck(this); // 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._onlineHandler;
|
||
|
|
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;
|
||
|
|
|
||
|
|
}());
|