CINXE.COM

<!DOCTYPE html> <html dir='ltr' lang='en' xmlns='http://www.w3.org/1999/xhtml' xmlns:b='http://www.google.com/2005/gml/b' xmlns:data='http://www.google.com/2005/gml/data' xmlns:expr='http://www.google.com/2005/gml/expr'> <head>  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-MXDQM7L');</script>   <meta content='width=device-width, initial-scale=1' name='viewport'/> <meta content='summary_large_image' name='twitter:card'/>  <link href='https://fonts.googleapis.com/css?family=Google+Sans:+400,500,700|Product+Sans:400|Roboto:300,400,500,700|Roboto+Mono:500&display=swap' media='all' rel='stylesheet'/>  <script type='text/javascript'> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-961555-69', 'auto', 'blogger'); ga('blogger.send', 'pageview'); </script>  <script type='text/javascript'> const API_KEY = 'AIzaSyDMscAMFlp56yWLwjFm-CiaSaThfLmRtds'; const BLOG_ID = '8474926331452026626'; //<![CDATA[ const currentYear = new Date().getFullYear(); const oldestBlogYear = 2006; const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; // FETCH 3 PREVIOUS POSTS ON BOTTOM OF THE SINGLE BLOG PAGE const fetchPreviousPosts = date => { const prevPosts = document.querySelector('#previousPosts'); const postsTitle = document.querySelector('#prevPostTitle'); const link = `https://blogger.googleapis.com/v3/blogs/${BLOG_ID}/posts?endDate=${date}&fetchBodies=false&fetchImages=true&maxResults=3&key=${API_KEY}`; const posts = fetch(link) .then(response => { return response.json(); }) .then(data => { if (!data.items || data.items.length < 3) { postsTitle.textContent = ''; return; } postsTitle.textContent = 'Previous posts'; const ulPrevPost = document.createElement('ul'); ulPrevPost.setAttribute('id', 'ulPrevPost'); prevPostsArr = data.items.map(post => { const aLink = document.createElement('a'); aLink.setAttribute('href', post.url); aLink.setAttribute('aria-label', post.title); aLink.classList.add('post-outer-container'); const article = document.createElement('article'); const postContainer = document.createElement('div'); postContainer.classList.add('post-outer', 'full-post'); const pArticle = document.createElement('p'); pArticle.classList.add('article-byline'); const snippet = document.createElement('div'); snippet.classList.add('snippet-thumbnail'); const span = document.createElement('span'); span.setAttribute('id', `prev-${post.id}`) span.classList.add('snippet-thumbnail-img'); const style = document.createElement('style') if (post.images) { style.textContent = ` #prev-${post.id} { background-size: 80%; background-image: url("${post.images[0].url}"); } `; } else { style.textContent = ` #prev-${post.id} { background-size: 80%; background-image: url("https://research.google/static/images/blog/google-ai-fallback.png"); } `; } snippet.append(span, style); const postContent = document.createElement('div'); postContent.classList.add('post-content', 'container'); const postHeaderCont = document.createElement('div'); postHeaderCont.classList.add('post-header-container', 'container'); const postHeader = document.createElement('div'); postHeader.classList.add('post-header'); postHeaderCont.appendChild(postHeader); const postHeaderLine = document.createElement('div'); postHeaderLine.classList.add('post-header-line-1'); postHeader.appendChild(postHeaderLine); const spanByLine = document.createElement('span'); spanByLine.classList.add('byline', 'post-timestamp'); postHeaderLine.appendChild(spanByLine); const meta = document.createElement('meta'); meta.setAttribute('content', post.url); const time = document.createElement('time'); time.classList.add('eyebrow'); time.setAttribute('datetime', post.published); time.title = post.published; time.textContent = `${new Date(post.published).toLocaleDateString('en-US', {month: 'short', day: 'numeric', year: 'numeric'})}`; spanByLine.append(meta, time); const postTitle = document.createElement('div'); postTitle.classList.add('post-title-container'); const h3 = document.createElement('h3'); h3.classList.add('post-title', 'entry-title'); h3.textContent = post.title; postTitle.appendChild(h3); const postBottom = document.createElement('div'); postBottom.classList.add('post-bottom'); const footer = document.createElement('div'); footer.classList.add('post-footer'); const footerLine = document.createElement('div'); footerLine.classList.add('post-footer-line', 'post-footer-line-0'); footer.appendChild(footerLine); const jumpLink = document.createElement('div'); jumpLink.classList.add('byline', 'jump-link'); const img = document.createElement('img'); img.src = src = 'https://research.google/static/images/blog/right-arrow-blue.svg'; jumpLink.appendChild(img); postBottom.append(footer, jumpLink); postContent.append(postHeaderCont, postTitle, postBottom); postContainer.append(pArticle, snippet, postContent); article.appendChild(postContainer); aLink.appendChild(article); return aLink; }); ulPrevPost.append(...prevPostsArr); prevPosts.append(ulPrevPost); }) .catch(err => { console.log('Error Reading data ' + err); }); }; // UPDATES LAST ROW OF CARDS ON HOMEPAGE (2 POSTS) TO TAKE UP ENTIRE WIDTH IN THE CASE THAT THERE IS A FEATURED POST FROM THE HOMEPAGE const adjustPostsLayout = () => { window.addEventListener('load', () => { const posts = document.getElementsByClassName("post-outer-container"); if (posts.length === 10) { const postContainer = document.getElementsByClassName("blog-posts hfeed container"); const extraPost = posts[9]; const extraPostTwo = posts[8]; const firstTrailingPost = extraPost; const secondTrailingPost = extraPostTwo; firstTrailingPost.classList.remove('post-outer-container'); secondTrailingPost.classList.remove('post-outer-container'); firstTrailingPost.classList.add('post-outer-container-helper'); secondTrailingPost.classList.add('post-outer-container-helper'); extraPost.remove(); extraPostTwo.remove(); const div = document.createElement('div'); div.classList.add('featured-posts-helper'); div.append(secondTrailingPost, firstTrailingPost); postContainer[0].append(div); } }) } // CREATE A TEXT SNIPPET FOR HERO POST ON HOME PAGE const createSnippet = () => { const heroPostBody = document.querySelector('#heroPostBody'); const bylineAuthor = heroPostBody.querySelector('.byline-author'); const firstParagraph = heroPostBody.querySelector('p'); firstParagraph.remove(); if (window.innerWidth < 767) { const paragraphContent = firstParagraph.textContent; const p = document.createElement('p'); p.textContent = paragraphContent.slice(0, 117) + '...'; heroPostBody.append(p || ''); } }; // GENERATE YEAR LIST FOR ARCHIVE FILTER const generateYearList = elementId => { const years = []; const yearsContainer = document.getElementById(elementId); for (let y = currentYear; y >= oldestBlogYear; y -= 1) { years.push(y); } const yearsElements = years.map(year => { const button = document.createElement('button'); button.innerText = year; button.classList.add('filter-btn', 'year-btn'); if (year === currentYear) button.classList.add('active'); return button; }); yearsContainer.append(...yearsElements); }; // GENERATE MONTH LIST FOR ARCHIVE FILTER const generateMonthList = elementId => { const monthContainer = document.getElementById(elementId); const monthsElements = months.map((month, i) => { const button = document.createElement('button'); button.innerText = month; button.classList.add('filter-btn', 'month-btn'); if (i === 0) button.classList.add('active'); button.value = i + 1; return button; }); monthContainer.append(...monthsElements); }; //]]> </script>  <style id='page-skin-1' type='text/css'></style>  <meta name='google-adsense-platform-account' content='ca-host-pub-1556223355139109'/> <meta name='google-adsense-platform-domain' content='blogspot.com'/> </head> <body class='container'>  <noscript><iframe height='0' src='https://www.googletagmanager.com/ns.html?id=GTM-MXDQM7L' style='display:none;visibility:hidden' width='0'></iframe></noscript>   <a class='skip-navigation' href='#main' tabindex='0'> Skip to main content </a>  <div class='all-container'>   <header class='on-top' id='header'> <div class='header__top'> <a class='header__hamburger open-menu' href='#' id='hamburger'> <div class='header__hamburger-burger'></div> </a> <a class='header__lockup' href='https://research.google'> <span class='off-screen'>Google Research Blog</span> <div class='header__logo'> <img alt='Google Research' src='https://research.google/static/images/blog/google-research.svg'/> </div> </a>  <nav class='header__nav' id='header__nav'> <a class='header__lockup' href='https://research.google'> <span class='off-screen'>Google Research Blog</span> <div class='header__logo'> <img alt='Google Research' src='https://research.google/static/images/blog/google-research.svg'/> </div> </a> <div class='header__items'> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/philosophy/'> Philosophy </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/research-areas/'> Research Areas </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/pubs/'> Publications </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/people/'> People </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/resources/'> Resources </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/outreach/'> Outreach </a> </div> <div aria-level='1' class='header__item'> <a class='header__link' href='https://research.google/careers/'> Careers </a> </div> <div aria-level='1' class='header__item'> <a class='header__link header__link--active' href='https://blog.research.google/'> Blog </a> </div> </div> </nav> <div class='header-search-container' id='headerSearchContainer'> <div class='header-search-icon' id='headerSearch'> <img alt='Search' src='https://research.google/static/images/blog/search.svg'/> </div> <div class='header-search-content'> <div class='section' id='bsectionSearchContainer'><div class='widget BlogSearch' data-version='2' id='BlogSearch1'> <div class='widget-content' role='search'> <form action='/search' target='_top'> <div class='search-input'> <input aria-label='Search blog' autocomplete='off' name='q' placeholder='Search blog' required='true' value=''/> <input name='max-results' type='hidden' value='11'/> <input name='by-date' type='hidden' value='true'/> <div class='header-search-close' id='headerSearchClose'> <img alt='Close' src='https://research.google/static/images/blog/close.svg'/> </div> </div> <button class='header-search-submit' type='submit'> <img alt='Search' src='https://research.google/static/images/blog/search.svg'/> </button> </form> </div> </div></div>  <div class='filters filters-vertical'> <div class='filters__wrapper'> <div class='filters__row'> <div class='filter archive'> <button class='filter__title'>Archive</button> <div class='filter__list'> <div class='filter__list-row' id='mobileHeaderYearList'> <script type='text/javascript'> generateYearList('mobileHeaderYearList'); </script> </div> <div class='filter__list-row' id='mobileHeaderMonthList'> <script type='text/javascript'> generateMonthList('mobileHeaderMonthList'); </script> </div> <div id='postsContainerMobile'></div> </div> </div> <div class='filter labels'> <button class='filter__title'>Labels</button> <div class='filter__list'> <div class='filter__list-row'> <button class='filter-btn label-btn' onClick='filterLabels(this)'>All</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>A</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>B</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>C</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>D</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>E</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>F</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>G</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>H</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>I</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>J</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>K</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>L</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>M</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>N</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>O</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>P</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Q</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>R</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>S</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>T</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>U</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>V</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>W</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>X</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Y</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Z</button> </div> <div id='labelsContainerMobile'></div> </div> </div> </div> </div> </div> </div> </div>  </div> <div class='header__overlay close-menu'></div> </header>    <main class='section-wrapper'> <section class='hero'> <div class='gen-art' data-card-type='hero' data-gen-art='' data-id='/philosophy/'> <div class='artwork' data-gen-art-background=''> <canvas height='275' style='display: none' width='275'></canvas> <div height='100%' style=' display: block; background-image: url('https://research.google/static/images/blog/gen-art.png'); background-repeat: no-repeat; background-size: cover; height: 275px; width: 275px; ' width='100%'></div> </div> </div>  <div class='white-overlay'> <div class='hero-meta'> <div class='hero-meta__wrapper'>  <h1 class='hero__title'>  </h1> </div> </div> </div> </section> </main>   <div class='centered-top-placeholder'></div>  <div class='main_content_container clearfix home-content'>  <div class='filters header-desktop'> <div class='filters__wrapper'> <div class='filters__row'> <div class='filter archive'> <button class='filter__title'>Archive</button> </div> <div class='filter labels'> <button class='filter__title'>Labels</button> </div> </div> <div class='filter__search section' id='bsectionSearchContainer2'><div class='widget BlogSearch' data-version='2' id='BlogSearch2'> <div class='widget-content' role='search'> <form action='/search' target='_top'> <div class='search-input'> <input aria-label='Search blog by keyword or author' autocomplete='off' name='q' placeholder='Search blog by keyword or author' required='true' value=''/> <input name='max-results' type='hidden' value='11'/> <input name='by-date' type='hidden' value='true'/> </div> <button class='header-search-submit' type='submit'> <img alt='Search' src='https://research.google/static/images/blog/search.svg'/> </button> </form> </div> </div></div> </div>   <div class='filter__list archive'> <div class='filter__list-row' id='desktopHeaderYearList'> <script type='text/javascript'> generateYearList('desktopHeaderYearList'); </script> </div> <div class='filter__list-row' id='desktopHeaderMonthList'> <script type='text/javascript'> generateMonthList('desktopHeaderMonthList'); </script> </div> <div id='postsContainerDesktop'></div> </div>  <div class='filter__list labels'> <div class='filter__list-row'> <button class='filter-btn label-btn' onClick='filterLabels(this)'>All</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>A</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>B</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>C</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>D</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>E</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>F</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>G</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>H</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>I</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>J</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>K</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>L</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>M</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>N</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>O</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>P</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Q</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>R</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>S</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>T</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>U</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>V</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>W</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>X</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Y</button> <button class='filter-btn label-btn' onClick='filterLabels(this)'>Z</button> </div> <div id='labelsContainerDesktop'></div> </div> </div>   <div class='page'> <div class='page_body'> <div class='centered'> <main class='centered-bottom' id='main' role='main' tabindex='-1'> <div class='main section' id='page_body' name='Page Body'> <div class='widget Blog' data-version='2' id='Blog1'> <div class='blog-posts hfeed container'> <div class='post-outer-container'> <div class='status-msg-body'> Sorry, the page you were looking for in this blog does not exist. </div> </div> </div> <div class='blog-posts hfeed container'> </div> </div></div> </main>  </div> </div> </div> </div>   <footer> <a aria-label='Google' class='footer__logo' href='https://www.google.com' target='_blank'> <img alt='Google' src='https://research.google/static/images/blog/google-logo-alt.svg'/> </a>  <div class='footer__links'> <a class='footer__link' href='https://policies.google.com/privacy' target='_blank'>Privacy</a> <a class='footer__link' href='https://policies.google.com/terms' target='_blank'>Terms</a> <a class='footer__link' href='https://about.google/' target='_blank'>About Google</a> <a class='footer__link' href='https://about.google/intl/en/products/' target='_blank'>Google Products</a> </div> </footer>   </div>  <script type='text/javascript'> //<![CDATA[ // VARIABLES let selectedYear = new Date().getFullYear(); let selectedMonth = 1; let labelsResultContainer = null; let blogData = null; const header = document.querySelector('#header'); const headerHeight = header.offsetHeight; const filters = document.querySelectorAll('.filters-vertical .filter__title'); const filtersRow = document.querySelector('.home-content .filters.header-desktop'); const headerSearch = document.querySelector('#headerSearch'); const headerSearchContainer = document.querySelector('#headerSearchContainer'); const headerSearchClose = document.querySelector('#headerSearchClose'); const headerOverlay = document.querySelector('.hero .white-overlay'); const blogPager = document.querySelector('#blog-pager'); const openMobileMenuElements = document.querySelector('.open-menu'); const closeMobileMenuElements = document.querySelector('.close-menu'); const scrolledClass = 'is-scrolled'; const isActiveClass = 'is-active'; const activeClass = 'active'; const openClass = 'is-open'; const fixedClass = 'is-fixed'; const notTopClass = 'not-on-top'; const topClass = 'on-top'; const defaultFiltersPositionY = 85; let scrollTopOld = 0; let waiting = false; let endScrollHandle = null; const headerDesktopArchiveTitle = document.querySelector('.header-desktop .archive .filter__title'); const headerDesktopLabelsTitle = document.querySelector('.header-desktop .labels .filter__title'); const archiveList = document.querySelector('.header-desktop .filter__list.archive'); const labelsList = document.querySelector('.header-desktop .filter__list.labels'); const yearBtns = document.querySelectorAll('.year-btn'); const labelBtns = document.querySelectorAll('.label-btn'); const monthBtns = document.querySelectorAll('.month-btn'); const urlParams = new URLSearchParams(window.location.search); let postsContainer, labelsContainer; if (window.innerWidth < 769) { postsContainer = document.querySelector('#postsContainerMobile'); labelsContainer = document.querySelector('#labelsContainerMobile'); } else { postsContainer = document.querySelector('#postsContainerDesktop'); labelsContainer = document.querySelector('#labelsContainerDesktop'); } const allLabel = document.querySelectorAll('.filter__list-row button.label-btn:first-child'); const getCurrentYear = new Date().getFullYear(); const oldBylineAuthor = document.querySelector('#Blog1 .byline-author'); const newBylineAuthor = document.querySelector('#Blog1 #newBylineAuthor'); const body = document.querySelector('body.search-view') || document.querySelector('body.label-view'); // USED TO CLOSE FILTER MODAL const pageContent = document.getElementsByClassName('page'); const blog1 = document.getElementById('Blog1'); const archiveElement = document.getElementsByClassName('filter__list archive'); const labelsElement = document.getElementsByClassName('filter__list labels'); const archiveIcon = document.getElementsByClassName('filter archive'); const labelIcon = document.getElementsByClassName('filter labels'); // MAKES ALL THE FIRST ELEMENTS OF THE FILTER ACTIVE allLabel.forEach(btn => { btn.classList.add(activeClass); }); // SELECT YEAR const setYear = e => { selectedYear = Number(e.target.textContent); yearBtns.forEach(btn => { btn.classList.remove(activeClass); e.target.classList.add(activeClass); }); fetchPosts(); }; // ADD CLICK LISTENER FOR EVERY YEAR BUTTON yearBtns.forEach(btn => { btn.addEventListener('click', setYear); }); // FILTER LABLES const filterLabels = target => { if (target) { labelBtns.forEach(btn => { btn.classList.remove(activeClass); target.classList.add(activeClass); }); } const letter = target ? target.textContent : 'All'; let labels = blogData; if (letter !== 'All') { labels = labels.filter(label => label[0].toLowerCase() === letter.toLowerCase()); } const pLabel = document.querySelector('#pLabel'); const ulLabel = document.querySelector('#ulLabel'); if (ulLabel) ulLabel.remove(); if (!labels.length) { const ul = document.createElement('ul'); ul.classList.add('filter-result-container'); ul.setAttribute('id', 'ulLabel'); const p = document.createElement('p'); p.classList.add('no-content'); p.textContent = 'No labels'; p.setAttribute('id', 'pLabel'); ul.appendChild(p); labelsContainer.appendChild(ul); return; } if (labels.length) { if (pLabel) pLabel.remove(); labelsResultContainer = labels.map(label => { const li = document.createElement('li'); const a = document.createElement('a'); a.setAttribute('href', `/search/label/${label}?max-results=11`); a.textContent = label; li.appendChild(a); return li; }); const ul = document.createElement('ul'); ul.classList.add('filter-result-container'); ul.setAttribute('id', 'ulLabel'); ul.append(...labelsResultContainer); labelsContainer.appendChild(ul); } }; const closeFilters = () => { archiveElement[0].classList.remove(activeClass); labelsElement[0].classList.remove(activeClass); archiveIcon[1].classList.remove(isActiveClass); labelIcon[1].classList.remove(isActiveClass); filtersRow.classList.remove(openClass); }; // GET LABELS const getLabels = target => { blog1.addEventListener('click', closeFilters); pageContent[0].addEventListener('click', closeFilters); const link = `https://www.googleapis.com/blogger/v3/blogs/${BLOG_ID}/posts?&key=${API_KEY}&maxResults=500`; const labels = fetch(link) .then(response => { return response.json(); }) .then(data => { if (data.items) { const labelsArr = [ ...new Set( data.items .map(el => el.labels) .filter(el => el) .flat() .sort() ), ]; blogData = labelsArr; filterLabels(); } }); }; // FETCH POSTS WHEN THE FILTER CONDITIONS CHANGE const fetchPosts = e => { if (e) { monthBtns.forEach(btn => { btn.classList.remove(activeClass); e.target.classList.add(activeClass); }); } selectedMonth = e ? Number(e.target.value) : selectedMonth; const formatedMonth = selectedMonth < 10 ? '0' + selectedMonth : selectedMonth; const link = `https://www.googleapis.com/blogger/v3/blogs/${BLOG_ID}/posts?&startDate=${selectedYear}-${formatedMonth}-01T00:00:00.00Z&endDate=${selectedYear}-${formatedMonth}-31T23:59:59.59Z&key=${API_KEY}`; const pArchive = document.querySelector('#pArchive'); const ulArchive = document.querySelector('#ulArchive'); const posts = fetch(link) .then(response => { return response.json(); }) .then(data => { if (!postsContainer) return; if (!data.items) { if (ulArchive) ulArchive.remove(); const ul = document.createElement('ul'); ul.classList.add('filter-result-container'); ul.setAttribute('id', 'ulArchive'); const p = document.createElement('p'); p.classList.add('no-content'); p.textContent = 'No posts'; p.setAttribute('id', 'pArchive'); ul.appendChild(p); postsContainer.appendChild(ul); return; } if (!blogData) getLabels(); const posts = data.items.map(post => { const li = document.createElement('li'); const a = document.createElement('a'); a.setAttribute('href', post.url); a.textContent = post.title; li.appendChild(a); return li; }); if (posts && pArchive) pArchive.remove(); if (ulArchive) ulArchive.remove(); const ul = document.createElement('ul'); ul.classList.add('filter-result-container'); ul.setAttribute('id', 'ulArchive'); ul.append(...posts); postsContainer.appendChild(ul); }) .catch(err => { console.log('Error Reading data ' + err); }); }; fetchPosts(); monthBtns.forEach(btn => { btn.addEventListener('click', fetchPosts); }); // HEADER ANIMATION WHITE SCROLLING window.addEventListener('scroll', () => { if (waiting) return; waiting = true; // CLEAR PREVIOUS TIMEOUT clearTimeout(endScrollHandle); endScrollHandle = setTimeout(() => { const scrollTop = document.documentElement.scrollTop; updateHeader(scrollTop); if (filtersRow) updateFilterRow(scrollTop); scrollTopOld = scrollTop; waiting = false; }, 100); }); const updateHeader = scrollTop => { if (scrollTop === 0) { header.classList.remove(notTopClass); 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filter.addEventListener('click', e => { const targetParent = e.currentTarget.parentNode; const isParentActive = targetParent.classList.contains(isActiveClass); filters.forEach(f => { f.parentNode.classList.remove(isActiveClass); }); if (isParentActive) { targetParent.classList.remove(isActiveClass); } else { targetParent.classList.add(isActiveClass); } }); }); closeMobileMenuElements.addEventListener('click', e => { e.preventDefault(); header.classList.remove(openClass); }); openMobileMenuElements.addEventListener('click', e => { e.preventDefault(); header.classList.add(openClass); headerSearchContainer.classList.remove(openClass); }); if (headerDesktopArchiveTitle) { headerDesktopArchiveTitle.addEventListener('click', e => { e.preventDefault(); headerDesktopArchiveTitle.parentNode.classList.toggle(isActiveClass); headerDesktopLabelsTitle.parentNode.classList.remove(isActiveClass); labelsList.classList.remove(activeClass); archiveList.classList.toggle(activeClass); archiveList.classList.contains(activeClass) ? filtersRow.classList.add(openClass) : filtersRow.classList.remove(openClass); }); } if (headerDesktopLabelsTitle) { headerDesktopLabelsTitle.addEventListener('click', e => { e.preventDefault(); headerDesktopLabelsTitle.parentNode.classList.toggle(isActiveClass); headerDesktopArchiveTitle.parentNode.classList.remove(isActiveClass); archiveList.classList.remove(activeClass); labelsList.classList.toggle(activeClass); labelsList.classList.contains(activeClass) ? filtersRow.classList.add(openClass) : filtersRow.classList.remove(openClass); }); } // SHARE IN NEW WINDOW shareSocial = link => { window.open(link.dataset.href, '_blank'); }; // REPLACE BELINE AUTHOR TEXT const moveBylineAuthorText = () => { if (!oldBylineAuthor || !newBylineAuthor) return; newBylineAuthor.innerText = oldBylineAuthor.innerText; oldBylineAuthor.style.display = 'none'; }; moveBylineAuthorText(); // HIDE 'OLDER POSTS' BUTTON IF NO MORE POSTS ON NEXT PAGE const 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