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'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"> <p class="ap-o-toc-hl">目次</p> </label> <input class="-us -un" type="checkbox" name="toc" id="toc" autocomplete="off"> <ul> <li> <a href="#amp-install-serviceworker">amp-install-serviceworker</a> <ul> <li> <a href="#introduction">Introduction</a> <a href="#setup">Setup</a> <a href="#installing-the-service-worker">Installing the service worker</a> </li> </ul> </li> </ul> </div> </section> <section class="-t"> <label class="-uo -ur 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">サイドバーの切り替え</span> </label> <label class="-uo -ul 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">サイドバーの切り替え</span> </label> <ul class="ap--format-tags"> <li class="ap--format-tag ap-a-format-tag ap-a-format-tag-websites">websites</li> </ul> <nav class="-ue"> <a class="ap-m-breadcrumbs-crumb" href="/ja/documentation/">ドキュメント</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -ut"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <a class="ap-m-breadcrumbs-crumb" href="/ja/documentation/examples/">実例</a> </nav> <h1 class="ap--title" id="amp-install-serviceworker">amp-install-serviceworker</h1> <div class="-ct"> <a class="ap-a-btn -cn " href="https://playground.amp.dev/?url=https://preview.amp.dev/documentation/examples/components/amp-install-serviceworker">Playground で開く</a> </div> <h2 id="introduction">Introduction</h2> <p>The <a href="/ja/documentation/components/amp-install-serviceworker/"><code>amp-install-serviceworker</code></a> component enables service worker installation via same origin or via the Google AMP Cache.</p> <p><a href="https://github.com/slightlyoff/ServiceWorker/blob/master/explainer.md">Service workers</a> can run in the background even when the browser is closed, cache required contents in advance of rendering time, send notifications to users, and more.</p> <p>This sample installs a service worker which caches this page in the background. You can test this by loading this page while offline once the service worker has been installed.</p> <p>Service Workers are currently available in <a href="https://jakearchibald.github.io/isserviceworkerready/">Chrome, Edge, Firefox, Opera and Safari</a>.</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"> The AMP Project provides a drop in <a href="https://github.com/ampproject/amp-sw">service Worker</a> to help your AMP pages gain network resiliency in one line. </div> </div><p></p> <h2 id="setup">Setup</h2> <p>Import the amp-install-serviceworker component.</p> <div class="ap-o-code-preview"> <div class="-ta"><pre><span></span><code><span class="p"><</span><span class="nt">script</span> <span class="na">async</span> <span class="na">custom-element</span><span class="o">=</span><span class="s">"amp-install-serviceworker"</span> <span class="na">src</span><span class="o">=</span><span class="s">"https://cdn.ampproject.org/v0/amp-install-serviceworker-0.1.js"</span><span class="p">></</span><span class="nt">script</span><span class="p">></span> </code></pre></div> </div> <h2 id="installing-the-service-worker">Installing the service worker</h2> <p>Calls to <code>amp-install-serviceworker</code> can include the <code>src</code> and <code>data-iframe-src</code> attributes. <code>src</code> is the location of the service worker to be installed, and is used when the document is accessed via the same origin as the service worker file. When the document is accessed via the Google AMP Cache, the HTML document noted in the <code>data-iframe-src</code> attribute is used to install the service worker. We recommend using both attributes.</p> <p>The reason why <code>amp-install-serviceworker</code> requires a separate <code>data-iframe-src</code> option is because browsers can't install service worker from other domains for security reasons. For details of the security considerations of service worker, <a href="https://www.w3.org/TR/service-workers/#security-considerations">see official specs</a>.</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"> If you don't want to provide a special minimal document to install a sevice worker, you can simply link to the AMP document on your own origin. </div> </div><p></p> <div class="ap-o-code-preview"> <div class="-ta"><pre><span></span><code><span class="p"><</span><span class="nt">amp-install-serviceworker</span> <span class="na">src</span><span class="o">=</span><span class="s">"/serviceworker.js"</span> <span class="na">data-iframe-src</span><span class="o">=</span><span class="s">"https://amp.dev/serviceworker.html"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"nodisplay"</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-install-serviceworker</span><span class="p">></span> </code></pre></div> </div> <p>In this sample, when users access this AMP page for the second time, the service worker is installed and caches all image files and video files under the root path of this domain.</p> <p>Confirm that the service worker is installed and works as expected by following the following steps:</p> <ol> <li>Access <a href="/components/amp-install-serviceworker">amp-install-serviceworker</a> twice.</li> <li>Open Chrome Dev Tools and navigate to the "Resources" tab (or "Application" tab on newer versions of Chrome). In the "Service Workers" section you can see that <code>/sw.js</code> is installed.</li> <li>Then open the "Cached Storage" section. It shows all cached images and videos.</li> <li>Disable your network connection and reload this page. It still works! In the "Network" tab in Dev Tools, you'll see which resources are cached by the service worker.</li> </ol> </section> <section class="ap--help"> <div class="-li"> <span class="-ls">さらに説明が必要ですか？</span> <p class="-lu">このページの説明でご質問のすべてを解消できない場合は、あなたの実際の使用事例について他の AMP ユーザーに問い合わせて話し合ってください。</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">Stack Overflow にアクセスする</span> </a> <div class="-la"></div> <span class="-ls">説明されていない機能ですか？</span> <p class="-lu">AMP プロジェクトでは皆さんの参加と貢献を強くお勧めしています！当社はオープンソースコミュニティに継続的にご参加いただくことを希望しますが、特に熱心に取り組んでいる問題があれば1回限りの貢献でも歓迎します。</p> <a href="https://github.com/ampproject/docs/blob/future/examples/source/1.components/amp-install-serviceworker.html" rel="noopener" class="-n link-preview-1"> <svg class="ap-a-ico -i"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#external"/></svg> <span 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