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themes, @diogoterremoto, @dracos, @Flimm, @TomS- and @vinyfc93 - many thanks for that ! */ /* * A minimal and dependency-free vanilla JavaScript loading attribute polyfill. * Supports standard's functionality and tests for native support upfront. * Elsewhere the functionality gets emulated with the support of noscript wrapper tags. * Use an IntersectionObserver polyfill in case of IE11 support necessary. * * MS - Removed iframe/picture/srcset parts, unneeded at present, and added external API */ (function () { 'use strict'; var config = { // Start download if the item gets within 256px in the Y axis rootMargin: '256px 0px', threshold: 0.01 }; // Device/browser capabilities object var capabilities = { loading: 'loading' in HTMLImageElement.prototype, scrolling: 'onscroll' in window }; // Nodelist foreach polyfill / source: https://stackoverflow.com/a/46929259 if ( typeof NodeList !== 'undefined' && NodeList.prototype && !NodeList.prototype.forEach ) { // Yes, there's really no need for `Object.defineProperty` here NodeList.prototype.forEach = Array.prototype.forEach; } // Define according to browsers support of the IntersectionObserver feature (missing e.g. on IE11 or Safari 11) var intersectionObserver; if ('IntersectionObserver' in window) { intersectionObserver = new IntersectionObserver(onIntersection, config); } // On using a browser w/o requestAnimationFrame support (IE9, Opera Mini), just run the passed function var rAFWrapper; if ('requestAnimationFrame' in window) { rAFWrapper = window.requestAnimationFrame; } else { rAFWrapper = function (func) { func(); }; } /** * Put the source back where it belongs - now that the elements content is attached to the document, it will load now * @param {Object} lazyItem Current item to be restored after lazy loading. */ function restoreSource(lazyItem) { lazyItem.setAttribute('src', lazyItem.getAttribute('data-lazy-src')); lazyItem.removeAttribute('data-lazy-src'); // Not using delete .dataset here for compatibility down to IE9 } /** * Handle IntersectionObservers callback * @param {Object} entries Target elements Intersection observed changes * @param {Object} observer IntersectionObserver instance reference */ function onIntersection(entries, observer) { entries.forEach(function (entry) { // Mitigation for EDGE lacking support of .isIntersecting until v15, compare to e.g. https://github.com/w3c/IntersectionObserver/issues/211#issuecomment-309144669 if (entry.intersectionRatio === 0) { return; } // If the item is visible now, load it and stop watching it var lazyItem = entry.target; observer.unobserve(lazyItem); restoreSource(lazyItem); }); } /** * Handle printing the page */ function onPrinting() { if (typeof window.matchMedia === 'undefined') { return; } var mediaQueryList = window.matchMedia('print'); mediaQueryList.addListener(function (mql) { if (mql.matches) { document .querySelectorAll('img[loading="lazy"][data-lazy-src]') .forEach(function (lazyItem) { restoreSource(lazyItem); }); } }); } /** * Get and prepare the HTML code depending on feature detection, * and if not scrolling supported, because it's a Google or Bing Bot * @param {String} lazyAreaHtml Noscript inner HTML code that src-urls need to get rewritten */ function getAndPrepareHTMLCode(noScriptTag) { // The contents of a <noscript> tag are treated as text to JavaScript var lazyAreaHtml = noScriptTag.textContent || noScriptTag.innerHTML; var getImageWidth = lazyAreaHtml.match(/width=['"](\d+)['"]/) || false; var temporaryImageWidth = getImageWidth[1] || 1; var getImageHeight = lazyAreaHtml.match(/height=['"](\d+)['"]/) || false; var temporaryImageHeight = getImageHeight[1] || 1; var temporaryImage = 'data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 ' + temporaryImageWidth + ' ' + temporaryImageHeight + '%27%3E%3C/svg%3E'; if (!capabilities.loading && capabilities.scrolling) { // Check for IntersectionObserver support if (typeof intersectionObserver === 'undefined') { // Attach abandonned attribute 'lazyload' to the HTML tags on browsers w/o IntersectionObserver being available lazyAreaHtml = lazyAreaHtml.replace( /(?:\r\n|\r|\n|\t| )src=/g, ' lazyload="1" src=' ); } else { // Temporarily replace a expensive resource load with a simple one by storing the actual source for later and point src to a temporary replacement (data URI) lazyAreaHtml = lazyAreaHtml .replace( /(?:\r\n|\r|\n|\t| )src=/g, ' src="' + temporaryImage + '" data-lazy-src=' ); } } return lazyAreaHtml; } /** * Retrieve the elements from the 'lazy load' <noscript> tag and prepare them for display * @param {Object} noScriptTag noscript HTML tag that should get initially transformed */ function prepareElement(noScriptTag) { // Sticking the noscript HTML code in the innerHTML of a new <div> tag to 'load' it after creating that <div> var lazyArea = document.createElement('div'); lazyArea.innerHTML = getAndPrepareHTMLCode(noScriptTag); // Move all children out of the element while (lazyArea.firstChild) { if ( !capabilities.loading && capabilities.scrolling && typeof intersectionObserver !== 'undefined' && lazyArea.firstChild.tagName && lazyArea.firstChild.tagName.toLowerCase() === 'img' ) { // Observe the item so that loading could start when it gets close to the viewport intersectionObserver.observe(lazyArea.firstChild); } noScriptTag.parentNode.insertBefore(lazyArea.firstChild, noScriptTag); } // Remove the empty element - not using .remove() here for IE11 compatibility noScriptTag.parentNode.removeChild(noScriptTag); // Preferred .removeChild over .remove here for IE } /* Add a function we can call externally */ fixmystreet.loading_recheck = function() { var lazyLoadAreas = document.querySelectorAll('noscript.loading-lazy'); lazyLoadAreas.forEach(prepareElement); }; /** * Get all the <noscript> tags on the page and setup the printing */ function prepareElements() { fixmystreet.loading_recheck(); // Bind for someone printing the page onPrinting(); } // If the page has loaded already, run setup - if it hasn't, run as soon as it has. // Use requestAnimationFrame as this will propably cause repaints // document.readyState values: https://www.w3schools.com/jsref/prop_doc_readystate.asp if (/comp|inter/.test(document.readyState)) { rAFWrapper(prepareElements); } else if ('addEventListener' in document) { document.addEventListener('DOMContentLoaded', function () { rAFWrapper(prepareElements); }); } else { document.attachEvent('onreadystatechange', function () { if (document.readyState === 'complete') { prepareElements(); } }); } })();