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Commit ada27cf

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Merge pull request WebStackPage#32 from hustjiangtao/master
Feat: img lazy loaded
2 parents c695c79 + 2ddd1de commit ada27cf

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-470
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3 files changed

+653
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‎assets/js/lozad.js‎

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/*! lozad.js - v1.14.0 - 2019年10月19日
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* https://github.com/ApoorvSaxena/lozad.js
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* Copyright (c) 2019 Apoorv Saxena; Licensed MIT */
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = global || self, global.lozad = factory());
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}(this, function () { 'use strict';
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/**
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* Detect IE browser
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* @const {boolean}
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* @private
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*/
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var isIE = typeof document !== 'undefined' && document.documentMode;
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var defaultConfig = {
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rootMargin: '0px',
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threshold: 0,
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load: function load(element) {
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if (element.nodeName.toLowerCase() === 'picture') {
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var img = document.createElement('img');
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if (isIE && element.getAttribute('data-iesrc')) {
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img.src = element.getAttribute('data-iesrc');
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}
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if (element.getAttribute('data-alt')) {
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img.alt = element.getAttribute('data-alt');
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}
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element.append(img);
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}
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if (element.nodeName.toLowerCase() === 'video' && !element.getAttribute('data-src')) {
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if (element.children) {
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var childs = element.children;
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var childSrc = void 0;
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for (var i = 0; i <= childs.length - 1; i++) {
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childSrc = childs[i].getAttribute('data-src');
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if (childSrc) {
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childs[i].src = childSrc;
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}
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}
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element.load();
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}
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}
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if (element.getAttribute('data-src')) {
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element.src = element.getAttribute('data-src');
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}
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if (element.getAttribute('data-srcset')) {
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element.setAttribute('srcset', element.getAttribute('data-srcset'));
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}
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if (element.getAttribute('data-background-image')) {
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element.style.backgroundImage = 'url(\'' + element.getAttribute('data-background-image').split(',').join('\'),url(\'') + '\')';
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} else if (element.getAttribute('data-background-image-set')) {
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var imageSetLinks = element.getAttribute('data-background-image-set').split(',');
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var firstUrlLink = imageSetLinks[0].substr(0, imageSetLinks[0].indexOf(' ')) || imageSetLinks[0]; // Substring before ... 1x
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firstUrlLink = firstUrlLink.indexOf('url(') === -1 ? 'url(' + firstUrlLink + ')' : firstUrlLink;
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if (imageSetLinks.length === 1) {
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element.style.backgroundImage = firstUrlLink;
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} else {
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element.setAttribute('style', (element.getAttribute('style') || '') + ('background-image: ' + firstUrlLink + '; background-image: -webkit-image-set(' + imageSetLinks + '); background-image: image-set(' + imageSetLinks + ')'));
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}
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}
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if (element.getAttribute('data-toggle-class')) {
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element.classList.toggle(element.getAttribute('data-toggle-class'));
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}
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},
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loaded: function loaded() {}
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};
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function markAsLoaded(element) {
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element.setAttribute('data-loaded', true);
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}
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var isLoaded = function isLoaded(element) {
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return element.getAttribute('data-loaded') === 'true';
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};
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var onIntersection = function onIntersection(load, loaded) {
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return function (entries, observer) {
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entries.forEach(function (entry) {
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if (entry.intersectionRatio > 0 || entry.isIntersecting) {
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observer.unobserve(entry.target);
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if (!isLoaded(entry.target)) {
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load(entry.target);
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markAsLoaded(entry.target);
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loaded(entry.target);
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}
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}
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});
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};
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};
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var getElements = function getElements(selector) {
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var root = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : document;
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if (selector instanceof Element) {
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return [selector];
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}
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if (selector instanceof NodeList) {
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return selector;
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}
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return root.querySelectorAll(selector);
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};
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function lozad () {
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var selector = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '.lozad';
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var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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var _Object$assign = Object.assign({}, defaultConfig, options),
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root = _Object$assign.root,
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rootMargin = _Object$assign.rootMargin,
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threshold = _Object$assign.threshold,
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load = _Object$assign.load,
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loaded = _Object$assign.loaded;
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var observer = void 0;
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if (typeof window !== 'undefined' && window.IntersectionObserver) {
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observer = new IntersectionObserver(onIntersection(load, loaded), {
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root: root,
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rootMargin: rootMargin,
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threshold: threshold
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});
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}
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return {
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observe: function observe() {
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var elements = getElements(selector, root);
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for (var i = 0; i < elements.length; i++) {
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if (isLoaded(elements[i])) {
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continue;
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}
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if (observer) {
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observer.observe(elements[i]);
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continue;
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}
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load(elements[i]);
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markAsLoaded(elements[i]);
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loaded(elements[i]);
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}
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},
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triggerLoad: function triggerLoad(element) {
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if (isLoaded(element)) {
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return;
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}
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load(element);
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markAsLoaded(element);
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loaded(element);
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},
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observer: observer
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};
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}
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return lozad;
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}));

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