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'mainmenuopen' : '')" i-amphtml-binding> <div class="ap-o-header"> <a class="ap-o-header-home" href="/"> <svg class="ap-o-header-home-logo"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#logo"/></svg> <span class="ap-o-header-home-title">AMP</span> </a> <nav class="ap-o-header-main"> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw "> About <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link websites" href="/about/websites/"> <div class="ap-o-header-flyout-primary-item-link-icon websites"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#amp-websites"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info ap-o-header-flyout-primary-item-link-info-websites"> <div 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class="ap-o-header-flyout-primary-item-link-info ap-o-header-flyout-primary-item-link-info-ads"> <div class="ap-o-header-flyout-item-title">AMP Ads</div> <div class="ap-o-header-flyout-item-description">Super fast ads on the web</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link email" href="/about/email/"> <div class="ap-o-header-flyout-primary-item-link-icon email"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#amp-email"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info ap-o-header-flyout-primary-item-link-info-email"> <div class="ap-o-header-flyout-item-title">AMP Email</div> <div class="ap-o-header-flyout-item-description">Next gen email</div> </div> </a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/about/how-amp-works/">How AMP works</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/about/mission-and-vision/">Vision & Mission</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/about/use-cases/">Use cases</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/success-stories/">Success Stories</a> </li> </ul> </div> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw active"> Documentation <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/documentation/">Get Started</a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/guides-and-tutorials/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#guides-documents"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Guides & Tutorials</div> <div class="ap-o-header-flyout-item-description">Get started with AMP</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/components/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#components-flyout"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Components</div> <div class="ap-o-header-flyout-item-description">The complete AMP library</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/examples/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#examples-flyout"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Examples</div> <div class="ap-o-header-flyout-item-description">Hands-on introduction to AMP</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/courses/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#learn"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Courses</div> <div class="ap-o-header-flyout-item-description">Learn AMP with free courses</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/templates/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#template"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Templates</div> <div class="ap-o-header-flyout-item-description">Ready to use</div> </div> </a> </li> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link " href="/documentation/tools/"> <div class="ap-o-header-flyout-primary-item-link-icon "> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#wrench"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info"> <div class="ap-o-header-flyout-item-title">Tools</div> <div class="ap-o-header-flyout-item-description">Begin building</div> </div> </a> </li> </ul> </div> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw "> Community <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/documentation/guides-and-tutorials/contribute/">Contribute</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/community/roadmap/">Roadmap</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/community/governance/">Governance</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/community/working-groups/access-subscriptions/">Working Groups</a> </li> </ul> </div> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw "> Events <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/events/amp-fest-2020/">AMP Fest 2020</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/events/amp-roadshow/">AMP Roadshow</a> </li> </ul> </div> <div class="ap-o-header-main-item"> <a class="ap-o-header-main-link -tw" href="https://blog.amp.dev">Blog</a> </div> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw "> Support <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/support/">Help</a> </li> <li class="ap-o-header-flyout-item-secondary"> <a class="ap-o-header-flyout-item-title secondary" href="/support/faq/">FAQ</a> </li> </ul> </div> </nav> <div class="-tv"> <span class="-tm" aria-label="Select a language" tabindex="-1"> <span class="-tw">EN</span> <div class="ap-a-ico -ty"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </span> <input class="-tg" type="checkbox" name="language-selector"> <div class="-tb" role="list"> <a class="-tw" href="/de/documentation/components/amp-live-list/" role="listitem">Deutsch</a> <a class="-tw" href="/fr/documentation/components/amp-live-list/" role="listitem">Français</a> <a class="-tw" href="/ar/documentation/components/amp-live-list/" role="listitem">العربية</a> <a class="-tw" href="/es/documentation/components/amp-live-list/" role="listitem">Español</a> <a class="-tw" href="/it/documentation/components/amp-live-list/" role="listitem">Italiano</a> <a class="-tw" href="/id/documentation/components/amp-live-list/" role="listitem">Indonesia</a> <a class="-tw" href="/ja/documentation/components/amp-live-list/" role="listitem">日本語</a> <a class="-tw" href="/ko/documentation/components/amp-live-list/" role="listitem">한국어</a> <a class="-tw" href="/pt_br/documentation/components/amp-live-list/" role="listitem">Português</a> <a class="-tw" href="/ru/documentation/components/amp-live-list/" role="listitem">Русский</a> <a class="-tw" href="/tr/documentation/components/amp-live-list/" role="listitem">Türkçe</a> <a class="-tw" href="/zh_cn/documentation/components/amp-live-list/" role="listitem">中文</a> <a class="-tw" href="/pl/documentation/components/amp-live-list/" role="listitem">Polski</a> <a class="-tw" href="/vi/documentation/components/amp-live-list/" role="listitem">Tiếng việt</a> </div> </div> </div> </header> <label class="ap-o-burger-menu-label" on="tap:AMP.setState({mainmenuopen: !mainmenuopen, noScrollState: !noScrollState})" [class]="'ap-o-burger-menu-label ' + (mainmenuopen ? 'mainmenuopen ' : '')" for="burger-menu" tabindex="0" role="button" aria-label="Burger Menu" i-amphtml-binding> <div class="ap-a-ico ap-o-burger-menu-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#menu"/></svg> </div> </label> <nav class="ap-o-burger-menu" [class]="mainmenuopen ? 'ap-o-burger-menu mainmenuopen' : 'ap-o-burger-menu'" i-amphtml-binding> <ul class="-th"> <li class="-tp"> <label class="ap-o-burger-menu-link -tw "> About </label> <input class="-td" type="checkbox" aria-label="About"> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <ul class="-th"> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/websites/"> AMP Websites </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/stories/"> Web Stories </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/ads/"> AMP Ads </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/email/"> AMP Email </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/how-amp-works/"> How AMP works </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/mission-and-vision/"> Vision & Mission </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/about/use-cases/"> Use cases </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/success-stories/"> Success Stories </a> </li> </ul> </li> <li class="-tp"> <label class="ap-o-burger-menu-link -tw active"> Documentation </label> <input class="-td" type="checkbox" aria-label="Documentation" checked> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <ul class="-th"> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/"> Get Started </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/guides-and-tutorials/"> Guides & Tutorials </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/components/"> Components </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/examples/"> Examples </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/courses/"> Courses </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/templates/"> Templates </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/tools/"> Tools </a> </li> </ul> </li> <li class="-tp"> <label class="ap-o-burger-menu-link -tw "> Community </label> <input class="-td" type="checkbox" aria-label="Community"> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <ul class="-th"> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/documentation/guides-and-tutorials/contribute/"> Contribute </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/community/roadmap/"> Roadmap </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/community/governance/"> Governance </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/community/working-groups/access-subscriptions/"> Working Groups </a> </li> </ul> </li> <li class="-tp"> <label class="ap-o-burger-menu-link -tw "> Events </label> <input class="-td" type="checkbox" aria-label="Events"> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <ul class="-th"> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/events/amp-fest-2020/"> AMP Fest 2020 </a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tx" href="/events/amp-roadshow/"> AMP Roadshow </a> </li> </ul> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tw" href="https://blog.amp.dev">Blog</a> </li> <li class="-tp"> <a class="ap-o-burger-menu-link -tw " href="/support/"> Help </a> </li> </ul> </nav> <div class="-oc"> <amp-position-observer on="enter:slideTransition.start; exit:slideTransition.start,slideTransition.reverse" intersection-ratios="1" layout="nodisplay" class="i-amphtml-layout-nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> </amp-position-observer> <amp-animation id="slideTransition" layout="nodisplay" class="i-amphtml-layout-nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> <script type="application/json">{"duration":"150ms","fill":"both","easing":"ease-out","iterations":"1","animations":[{"selector":".label-title","keyframes":[{"transform":"scale3d(0, 1, 1)"},{"transform":"scale3d(1, 1, 1)"}]}]}</script> </amp-animation> </div> <amp-user-notification class="-fv i-amphtml-layout-nodisplay" id="format-filter-hint" layout="nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> </amp-user-notification> <div class="-fd" aria-hidden="true"> <div class="-fm"> <div class="-fg">Select your format for a more streamlined experience</div> <button class="-fy" on="tap:format-filter-hint.dismiss"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#close"/></svg> </button> </div> </div> <main class="ap--main -fb"> <div class="-tf"> <input class="-od ap-a-sidebar-mobile-toggle-input-sidebar" type="checkbox" name="sidebar" id="sidebar" autocomplete="off"> <input class="-om ap-a-sidebar-desktop-toggle-input-sidebar" type="checkbox" name="sidebar-desktop" id="sidebar-desktop" autocomplete="off"> <span id="ap--sidebar-content" class="-oy"></span> <section class="ap--toc"> <div class="ap-o-toc" [class]="contentmenuopen ? 'ap-o-toc contentmenuopen' : 'ap-o-toc'" i-amphtml-binding> <label class="ap-o-toc-toggle" for="toc" on="tap:AMP.setState({contentmenuopen: !contentmenuopen})" role="contentmenutrigger" tabindex="0"> <span class="ap-o-toc-hl">Table of contents</span> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> </label> <input class="-oh -of" type="checkbox" name="toc" id="toc" autocomplete="off"> <ul><li><a href="#usage">Usage</a><ul> <li><a href="#how-it-works">How it works</a></li> <li><a href="#polling">Polling</a></li> <li><a href="#reference-points">Reference Points</a><ul> <li><a href="#update">update</a></li> <li><a href="#items">items</a></li> <li><a href="#pagination">pagination</a></li> </ul> </li> <li><a href="#update-behavior-and-user-experience">Update Behavior and User Experience</a></li> <li><a href="#how-pagination-works">How Pagination works</a></li> <li><a href="#server-side-filtering">Server Side filtering</a></li> </ul> </li> <li><a href="#attributes">Attributes</a><ul> <li><a href="#id-(required)">id (required)</a></li> <li><a href="#data-poll-interval">data-poll-interval</a></li> <li><a href="#data-max-items-per-page-(required)">data-max-items-per-page (required)</a></li> <li><a href="#disabled">disabled</a></li> <li><a href="#attributes-on-items-reference-point-children">Attributes on items reference point children</a><ul> <li><a href="#id-(required)_1">id (required)</a></li> <li><a href="#data-sort-time-(required)">data-sort-time (Required)</a></li> <li><a href="#data-update-time-(optional)">data-update-time (Optional)</a></li> <li><a href="#data-tombstone-(optional)">data-tombstone (Optional)</a></li> <li><a href="#sort-(optional)">sort (Optional)</a></li> </ul> </li> </ul> </li> <li><a href="#actions">Actions</a><ul> <li><a href="#update_1">update</a></li> </ul> </li> <li><a href="#styling">Styling</a></li> <li><a href="#validation">Validation</a></li></ul> </div> </section> <section class="-t"> <label class="-op -ol ap-a-sidebar-mobile-toggle-label-sidebar" for="sidebar" on="tap:sidebar-left.toggle" role="categoriemenutrigger" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <label class="-op -og ap-a-sidebar-desktop-toggle-label-sidebar" for="sidebar-desktop" role="categoriemenutrigger-desktop" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <nav class="-ou"> <a class="ap-m-breadcrumbs-crumb" href="/documentation/">Documentation</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -oa"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <a class="ap-m-breadcrumbs-crumb" href="/documentation/components/">Components</a> </nav> <h1> amp-live-list </h1> <div class="ap-o-component-intro"> <div class="ap-o-component-intro-row"> <h4 class="ap-o-component-intro-headline">Description</h4> <p class="ap-o-component-intro-text">Provides a way to display and update content live.</p> </div>   <div class="ap-o-component-intro-row ap-o-component-intro-row-inline"> <h4 class="ap-o-component-intro-headline">Required Scripts</h4> <div id="amp-script" class="ap-a-copy-script"> <pre><script async custom-element="amp-live-list" src="https://cdn.ampproject.org/v0/amp-live-list-0.1.js"></script></pre> <amp-iframe width="24" height="24" layout="fixed" sandbox="allow-scripts" src="https://amp.dev/shared/copy-script/#%3Cscript%20async%20custom-element%3D%22amp-live-list%22%20src%3D%22https%3A//cdn.ampproject.org/v0/amp-live-list-0.1.js%22%3E%3C/script%3E" class="i-amphtml-layout-fixed i-amphtml-layout-size-defined" style="width:24px;height:24px;" i-amphtml-layout="fixed"> <div placeholder></div> </amp-iframe> </div> </div> <div class="ap-o-component-intro-row ap-o-component-intro-row-inline"> <h4 class="ap-o-component-intro-headline">Supported Layouts</h4> <div> <a class='ap-a-pill ap-a-pill-flat ap-a-pill-small ap-a-pill-link' href='/documentation/guides-and-tutorials/learn/amp-html-layout/layouts_demonstrated#container'>container</a> <a class='ap-a-pill ap-a-pill-flat ap-a-pill-small ap-a-pill-link' href='/documentation/guides-and-tutorials/learn/amp-html-layout/layouts_demonstrated#fixed-height'>fixed-height</a> </div> </div> <div class="ap-o-component-intro-row"> <div id="examples" class="ap-m-clip"> <h4 class="ap-o-component-intro-headline">Examples</h4> <div class="ap-o-component-intro-list"> <a class='ap-o-component-intro-list-item' href='/documentation/examples/components/amp-live-list/'>amp-live-list</a> <a class='ap-o-component-intro-list-item' href='/documentation/examples/news-publishing/live_blog/'>Live Blog</a> </div> </div> </div> </div> <h2 id="usage">Usage</h2> <p>A wrapper and minimal UI for content that updates live in the client instance as new content is available in the source document.</p> <p><code>amp-live-list</code> provides instant content updates from the client. Depending on implementation, it can update the DOM without user interaction, such as refreshing or navigating to a different page. The core use case for this component is live blogs: coverage for breaking news or live events where the user can stay on or keep returning to the same page to see new updates as they come in. Common examples are award shows, sporting events, and elections.</p> <p>Below we have an example of multiple <code>amp-live-list</code> on a single page. Notice that only the first<code>amp-live-list</code> has a fixed position button, while the second one is inside the component with a sliding animation.</p> <p>The polling interval will also be 16000 and not 20000 milliseconds, as we choose the lowest one.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">style</span> <span class="na">amp-custom</span><span class="p">></span> <span class="nt">amp-live-list</span> <span class="o">></span> <span class="o">[</span><span class="nt">update</span><span class="o">]</span> <span class="p">{</span> <span class="k">display</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="p">}</span> <span class="p">#</span><span class="nn">fixed-button</span> <span class="p">{</span> <span class="k">position</span><span class="p">:</span> <span class="kc">fixed</span><span class="p">;</span> <span class="k">top</span><span class="p">:</span> <span class="mi">10</span><span class="kt">px</span><span class="p">;</span> <span class="k">left</span><span class="p">:</span> <span class="mi">50</span><span class="kt">%</span><span class="p">;</span> <span class="k">transform</span><span class="p">:</span> <span class="nb">translateX</span><span class="p">(</span><span class="nv">-50</span><span class="err">%</span><span class="p">);</span> <span class="p">}</span> <span class="p">.</span><span class="nc">slide</span><span class="p">.</span><span class="nc">amp-active</span> <span class="p">{</span> <span class="k">overflow-y</span><span class="p">:</span> <span class="kc">hidden</span><span class="p">;</span> <span class="k">height</span><span class="p">:</span> <span class="mi">100</span><span class="kt">px</span><span class="p">;</span> <span class="k">max-height</span><span class="p">:</span> <span class="mi">150</span><span class="kt">px</span><span class="p">;</span> <span class="k">transition-property</span><span class="p">:</span> <span class="k">height</span><span class="p">;</span> <span class="k">transition-duration</span><span class="p">:</span> <span class="mf">0.2</span><span class="kt">s</span><span class="p">;</span> <span class="k">transition-timing-function</span><span class="p">:</span> <span class="kc">ease-in</span><span class="p">;</span> <span class="k">background</span><span class="p">:</span> <span class="mh">#3f51b5</span><span class="p">;</span> <span class="p">}</span> <span class="p">.</span><span class="nc">slide</span><span class="p">.</span><span class="nc">amp-hidden</span> <span class="p">{</span> <span class="k">max-height</span><span class="p">:</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span> <span class="o">//</span> <span class="nt">We</span> <span class="nt">need</span> <span class="nt">to</span> <span class="nt">override</span> <span class="s2">"display: none"</span> <span class="nt">to</span> <span class="nt">be</span> <span class="nt">able</span> <span class="nt">to</span> <span class="nt">see</span> <span class="o">//</span> <span class="nt">the</span> <span class="nt">transition</span> <span class="nt">effect</span> <span class="nt">on</span> <span class="nt">the</span> <span class="nt">2nd</span> <span class="nt">live</span> <span class="nt">list</span><span class="o">.</span> <span class="p">#</span><span class="nn">live-list-2</span> <span class="o">></span> <span class="p">.</span><span class="nc">amp-hidden</span><span class="o">[</span><span class="nt">update</span><span class="o">]</span> <span class="p">{</span> <span class="k">display</span><span class="p">:</span> <span class="kc">block</span><span class="p">;</span> <span class="p">}</span> <span class="p"></</span><span class="nt">style</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-live-list</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-1"</span> <span class="na">data-poll-interval</span><span class="o">=</span><span class="s">"16000"</span> <span class="na">data-max-items-per-page</span><span class="o">=</span><span class="s">"5"</span> <span class="p">></span> <span class="p"><</span><span class="nt">button</span> <span class="na">update</span> <span class="na">id</span><span class="o">=</span><span class="s">"fixed-button"</span> <span class="na">class</span><span class="o">=</span><span class="s">"button"</span> <span class="na">on</span><span class="o">=</span><span class="s">"tap:live-list-1.update"</span><span class="p">></span> new updates on live list 1 <span class="p"></</span><span class="nt">button</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">items</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-1-item-2"</span> <span class="na">data-sort-time</span><span class="o">=</span><span class="s">"1462814963592"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"card"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"logo"</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"/examples/img/ampicon.png"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"fixed"</span> <span class="na">height</span><span class="o">=</span><span class="s">"50"</span> <span class="na">width</span><span class="o">=</span><span class="s">"50"</span> <span class="p">></span> <span class="p"></</span><span class="nt">amp-img</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-1-item-1"</span> <span class="na">data-sort-time</span><span class="o">=</span><span class="s">"1462814955597"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"card"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"logo"</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"/examples/img/ampicon.png"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"fixed"</span> <span class="na">height</span><span class="o">=</span><span class="s">"50"</span> <span class="na">width</span><span class="o">=</span><span class="s">"50"</span> <span class="p">></span> <span class="p"></</span><span class="nt">amp-img</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-live-list</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-live-list</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-2"</span> <span class="na">data-poll-interval</span><span class="o">=</span><span class="s">"20000"</span> <span class="na">data-max-items-per-page</span><span class="o">=</span><span class="s">"10"</span> <span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">update</span> <span class="na">class</span><span class="o">=</span><span class="s">"slide"</span> <span class="na">on</span><span class="o">=</span><span class="s">"tap:live-list-2.update"</span><span class="p">></span> new updates on live list 2 <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">items</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-2-item-2"</span> <span class="na">data-sort-time</span><span class="o">=</span><span class="s">"1464281932879"</span><span class="p">></span>world<span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"live-list-2-item-1"</span> <span class="na">data-sort-time</span><span class="o">=</span><span class="s">"1464281932878"</span><span class="p">></span>hello<span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-live-list</span><span class="p">></span> </pre></div> <p>To learn how to use <code>amp-live-list</code> in a blog, see the <a href="https://amp.dev/documentation/guides-and-tutorials/develop/live_blog">Create a Live Blog</a> tutorial.</p> <h3 id="how-it-works">How it works</h3> <p>In the background, while an AMP page using <code><amp-live-list></code> is displayed on the client, the AMP runtime polls the origin document on the host for updates. When the client receives a response, it then <a href="#server-side-filtering">filters</a> and dynamically inserts those updates back into the page on the client. Publishers can customize the polling rate in order to control the number of incoming requests, and AMP caches like the Google AMP Cache can perform optimizations to reduce the server response payload, saving client bandwidth and CPU cycles.</p> <p>The <code>amp-live-list</code> component has 3 sections. We'll refer to these sections as "reference points" and they are denoted by an attribute. These reference points must be a direct child of the <code>amp-live-list</code> component. The 3 reference points are:</p> <ul> <li><code>update</code> (mandatory)</li> <li><code>items</code> (mandatory)</li> <li><code>pagination</code> (optional)</li> </ul> <p>For more details, see the <a href="#reference-points">"Reference Points"</a> section below.</p> <p>Example:</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-live-list</span> <span class="na">id</span><span class="o">=</span><span class="s">"my-live-list"</span> <span class="na">data-poll-interval</span><span class="o">=</span><span class="s">"15000"</span> <span class="na">data-max-items-per-page</span><span class="o">=</span><span class="s">"20"</span> <span class="p">></span> <span class="p"><</span><span class="nt">button</span> <span class="na">update</span> <span class="na">on</span><span class="o">=</span><span class="s">"tap:my-live-list.update"</span><span class="p">></span>You have updates!<span class="p"></</span><span class="nt">button</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">items</span><span class="p">></</span><span class="nt">div</span><span class="p">></span> <span class="c"></span> <span class="p"><</span><span class="nt">div</span> <span class="na">pagination</span><span class="p">></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-live-list</span><span class="p">></span> </pre></div> <h3 id="polling">Polling</h3> <p>In most implementations for live blogs, content is either pushed by the server to the client instance of a page, or the client polls a JSON endpoint to receive updates. The implementation for this component is different, in that the client instance of the page polls the server copy of the document for updates to the <code>items</code> reference point. For instance: if the user is viewing a document served from an AMP cache, the client will poll that document hosted on that AMP cache for updates; if the user is viewing a document served from a web publisher's origin domain (e.g. "example.com"), then the client will poll the document hosted on that origin domain for updates.</p> <p>This means that publishers of content do not need to set up a JSON endpoint or push mechanism for this component to work. New content just needs to be published to the same URL, with a valid <code>amp-live-list</code> markup, and the user will have that content pulled into their client instance during the next poll (poll intervals are configurable in the component, and are valid above the minimum of 15 seconds).</p> <p>When multiple <code>amp-live-list</code> components are on a page, we choose the smallest polling interval across the <code>amp-live-list</code> components and use that as the polling interval.</p> <h3 id="reference-points">Reference Points<a name="reference-points"></a></h3> <h4 id="update"><code>update</code></h4> <p>The <code>update</code> reference point is shown when new items are received from the server, to provide an affordance for users to refresh the page with new items when they are available. It is hidden by default (through an <code>.amp-hidden</code> class whose style can be overridden). You may style this reference point as a <code>fixed</code> position item if you want a floating button on the page like on social media websites, to draw the reader's attention to take action. Currently the <code>update</code> reference point is not shown for either updates (using <code>data-update-time</code>) or tombstone (using <code>data-tombstone</code>) operations without an insert (newly discovered id's) operation.</p> <p> </p><div class="ap-m-tip"> <div class="ap-a-ico ap-m-tip-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#speech-bubble"/></svg> </div> <div class="ap-m-tip-content"> <p></p> <p>When using <code>position: fixed</code> we highly recommend that you use an id selector or a css selector with no other css combinators, because complex combinators cannot be moved into the fixed layer (fixed layer is an iOS workaround for webkit's fixed position <a href="https://bugs.webkit.org/show_bug.cgi?id=154399">bug</a>.</p> <p> </p></div> </div><p></p> <p>The actual action handler may be at a descendant and does not have to be at the <code>update</code> reference point. the <code>amp-live-list</code> component then has an internal <code>update</code> method than can receive the action. See the <code>on="tap:my-live-list.update"</code> handler.</p> <p>Example:</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-live-list</span> <span class="na">id</span><span class="o">=</span><span class="s">"my-live-list"</span> <span class="na">data-poll-interval</span><span class="o">=</span><span class="s">"15000"</span> <span class="na">data-max-items-per-page</span><span class="o">=</span><span class="s">"20"</span> <span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">update</span> <span class="na">class</span><span class="o">=</span><span class="s">"outer-container"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"inner-container"</span><span class="p">></span> <span class="p"><</span><span class="nt">button</span> <span class="na">class</span><span class="o">=</span><span class="s">"btn"</span> <span class="na">on</span><span class="o">=</span><span class="s">"tap:my-live-list.update"</span><span class="p">></span>Click me!<span class="p"></</span><span class="nt">button</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">items</span><span class="p">></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-live-list</span><span class="p">></span> </pre></div> <h4 id="items"><code>items</code></h4> <p>The <code>items</code> reference point is where new items are inserted, replaced or removed. Children of the <code>items</code> reference point are required to have an <code>id</code> and a <code>data-sort-time</code> attribute.</p> <h4 id="pagination"><code>pagination</code></h4> <p>The <code>pagination</code> reference point is where any sort of pagination markup is located. We recommend having a small subtree underneath this reference point as the <code>amp-live-list</code> component will be doing an inline replace of the DOM received from the server in case the page count had increased. We don't do any special diffing and just outright replace the contents.</p> <h3 id="update-behavior-and-user-experience">Update Behavior and User Experience</h3> <p>When updates are discovered by the client from polling the server document, any newly discovered <code>id</code>'s from children of the <code>items</code> reference point will turn the <code>update</code> reference point visible. A user action is required for these items to be inserted into the client's live DOM. We scroll the top of the <code>amp-live-list</code> component into view when the reader clicks on the update action.</p> <p>If a <code>data-update-time</code> attribute is present and its value is a number higher than the original <code>data-sort-time</code> on the attribute, the item will be updated in place through a <code>replaceChild</code> operation. If a <code>data-tombstone</code> attribute is present the element's subtree will be emptied out and the item is hidden through css (see <a href="https://github.com/ampproject/amphtml/blob/main/extensions/amp-live-list/0.1/amp-live-list.css">amp-live-list.css</a>).</p> <p>If a replace or tombstone operation is found but no insert (no new items) is found on a poll request, the replace and the tombstone operation will occur without the need for a reader's action. The component and the AMP runtime will try and maintain the viewport's scroll position but since a replace could have components in its subtree that cause a resize (<code>amp-twitter</code>, <code>amp-iframe</code>, etc.) after the fact, we discourage having a lot of replace operations through the <code>data-update-time</code> attribute.</p> <h3 id="how-pagination-works">How Pagination works</h3> <p>As AMP's focus is on performance we recommend the publisher keep a low number of items on a single page by limiting the number of children the <code>items</code> reference point has, as well as setting a good <code>data-max-items-per-page</code> value. Neither the client nor any cache that may be used knows anything about the full number of items. so it is up to the publisher to update the <code>pagination</code> reference point correctly based on the number of valid items. Items which have the <code>data-tombstone</code> attribute for example should not be counted, as they are hidden.</p> <p>Once the number of valid live items is over the <code>data-max-items-per-page</code> value, the component will try and remove items that are below the viewport until the number the live items is equal or below the <code>data-max-items-per-page</code> value. The number of items may possibly be over the <code>data-max-items-per-page</code> value if the item for deletion is not below the viewport.</p> <p>When a reader is not on page 1 of the document, the <code>disabled</code> attribute should be applied to all <code>amp-live-list</code> components since the component will still try to insert new items if it identifies any and has no notion that is not on the first page.</p> <h3 id="server-side-filtering">Server Side filtering<a name="server-side-filtering"></a></h3> <p>See the documentation for <a href="https://github.com/ampproject/amphtml/blob/main/extensions/amp-live-list/../amp-live-list/amp-live-list-server-side-filtering.md">Server side filtering</a>.</p> <h2 id="attributes">Attributes</h2> <h3 id="id-(required)"><code>id</code> (required)</h3> <p>To uniquely identify an <code>amp-live-list</code> (since multiple are allowed on a single page).</p> <h3 id="data-poll-interval"><code>data-poll-interval</code></h3> <p>Time (in milliseconds) interval between checks for new content (15000 ms minimum is enforced). If no <code>data-poll-interval</code> is provided it will default to the 15000 ms minimum.</p> <h3 id="data-max-items-per-page-(required)"><code>data-max-items-per-page</code> (required)</h3> <p>Maximum number of child entries. Additional elements are assumed to be on the next "page". If the number of children items is greater than the number provided on the attribute, the number of children items will be the new <code>data-max-items-per-page</code>. Once the number of live items on an <code>amp-live-list</code> is over the <code>data-max-items-per-page</code> limit items below the viewport will be fully removed from the live DOM.</p> <h3 id="disabled"><code>disabled</code></h3> <p>No polling will occur. Recommended when not on page 1 (looking at archival data) and when the article is no longer fresh and should no longer be updated.</p> <h3 id="attributes-on-items-reference-point-children">Attributes on <code>items</code> reference point children</h3> <p>Usually attribute requirements are only enforced on the actual component but because we need to anchor and make decisions on the client, we will also need to require an <code>items</code> and <code>update</code> attribute on a direct child of <code>amp-live-list</code>. Children of the <code>items</code> reference point will also have attribute requirements.</p> <h4 id="id-(required)_1"><code>id</code> (required)</h4> <p>The ID of the <code>items</code> child must never change.</p> <h4 id="data-sort-time-(required)"><code>data-sort-time</code> (Required)</h4> <p>Timestamp used for sorting entries. Higher timestamps will be inserted before older entries. We recommend using Unix time (the number of seconds that have elapsed since Thursday, 1 January 1970).</p> <h4 id="data-update-time-(optional)"><code>data-update-time</code> (Optional)</h4> <p>Timestamp when the entry was last updated. Use this attribute to trigger an update on an existing item: the client will replace all existing content in this item with the new, updated content, without triggering the appearance of the update reference point. We recommend using Unix time (the number of seconds that have elapsed since Thursday, 1 January 1970).</p> <h4 id="data-tombstone-(optional)"><code>data-tombstone</code> (Optional)</h4> <p>If present, the entry is assumed to be deleted.</p> <h4 id="sort-(optional)"><code>sort</code> (Optional)</h4> <p>If present and has a value of "ascending" (any other value is currently invalid), newer items will be inserted at the bottom of the live-list instead of the top.</p> <h2 id="actions">Actions</h2> <p>The <code>amp-live-list</code> exposes the following actions you can use <a href="https://amp.dev/documentation/guides-and-tutorials/learn/amp-actions-and-events/">AMP on-syntax to trigger</a>.</p> <h3 id="update_1"><code>update</code></h3> <p>Updates DOM elements with new discovered updates.</p> <h2 id="styling">Styling</h2> <p>On very slow connections the javascript and styles of the component might arrive later than when the body is unhidden (the <code>amp-boilerplate</code> style <code>timesout</code>) so we highly recommend adding the following styles below in your own <code>amp-custom</code> styles.</p> <div class="-ta"><pre><span></span><span class="nt">amp-live-list</span> <span class="o">></span> <span class="o">[</span><span class="nt">update</span><span class="o">]</span> <span class="p">{</span> <span class="k">display</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="p">}</span> </pre></div> <p>When we apply the <code>amp-active</code> class to the update reference point it will set <code>display: block</code>.</p> <p>An <code>amp-live-list-item</code> class is added to all the children of the <code>items</code> reference point.</p> <p>All newly inserted items will also have the <code>amp-live-list-item-new</code> class added, and will be removed once the next set of new items are inserted on a subsequent update. You can add a highlighting effect like the css below.</p> <div class="-ta"><pre><span></span><span class="p">.</span><span class="nc">amp-live-list-item-new</span> <span class="p">{</span> <span class="k">animation</span><span class="p">:</span> <span class="n">amp-live-list-item-highlight</span> <span class="mi">2</span><span class="kt">s</span><span class="p">;</span> <span class="p">}</span> <span class="p">@</span><span class="k">keyframes</span> <span class="nt">amp-live-list-item-highlight</span> <span class="p">{</span> <span class="nt">0</span><span class="o">%</span> <span class="p">{</span> <span class="k">box-shadow</span><span class="p">:</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">5</span><span class="kt">px</span> <span class="mi">2</span><span class="kt">px</span> <span class="nb">rgba</span><span class="p">(</span><span class="mi">81</span><span class="p">,</span> <span class="mi">203</span><span class="p">,</span> <span class="mi">238</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span> <span class="p">}</span> <span class="nt">100</span><span class="o">%</span> <span class="p">{</span> <span class="k">box-shadow</span><span class="p">:</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span> <span class="p">}</span> </pre></div> <p>There is css that hides children of the <code>items</code> reference point that have the <code>data-tombstone</code> attribute which can be overridden by doing:</p> <div class="-ta"><pre><span></span><span class="nt">amp-live-list</span> <span class="o">></span> <span class="o">[</span><span class="nt">items</span><span class="o">]</span> <span class="o">></span> <span class="o">[</span><span class="nt">data-tombstone</span><span class="o">]</span> <span class="p">{</span> <span class="k">display</span><span class="p">:</span> <span class="kc">block</span><span class="p">;</span> <span class="p">}</span> </pre></div> <p>An <code>.amp-hidden</code> and <code>.amp-active</code> class is added to the <code>update</code> reference point, and you can hook into this class to add transitions.</p> <h2 id="validation">Validation</h2> <p>See <a href="https://github.com/ampproject/amphtml/blob/main/extensions/amp-live-list/validator-amp-live-list.protoascii">amp-live-list rules</a> in the AMP validator specification.</p> </section> <section class="ap--help"> <div class="-ff"> <span class="-fl">Need more help?</span> <p class="-fh">You've read this document a dozen times but it doesn't really cover all of your questions? Maybe other people felt the same: reach out to them on Stack Overflow.</p> <a href="https://stackoverflow.com/questions/tagged/amp-html" rel="noopener" class="-n"> <svg class="ap-a-ico -i"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#external"/></svg> <span class="-r">Go to Stack Overflow</span> </a> <div class="-fp"></div> <span class="-fl">Found a bug or missing a feature?</span> <p class="-fh">The AMP project strongly encourages your participation and contributions! 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