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<html lang="fr"> |
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<title>How to style RSS feed (archive) — David Larlet</title> |
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<meta name="description" content="Publication mise en cache pour en conserver une trace."> |
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<script> |
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function toggleTheme(themeName) { |
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document.documentElement.classList.toggle( |
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'forced-dark', |
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themeName === 'dark' |
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) |
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document.documentElement.classList.toggle( |
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'forced-light', |
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themeName === 'light' |
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) |
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} |
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const selectedTheme = localStorage.getItem('theme') |
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if (selectedTheme !== 'undefined') { |
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toggleTheme(selectedTheme) |
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} |
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</script> |
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<link rel="canonical" href="https://lepture.com/en/2019/rss-style-with-xsl"> |
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<body class="remarkdown h1-underline h2-underline h3-underline em-underscore hr-center ul-star pre-tick"> |
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<article> |
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<header> |
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<h1>How to style RSS feed</h1> |
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</header> |
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<nav> |
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<p class="center"> |
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<a href="/david/" title="Aller à l’accueil"><svg class="icon icon-home"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-home"></use> |
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</svg> Accueil</a> • |
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<a href="https://lepture.com/en/2019/rss-style-with-xsl" title="Lien vers le contenu original">Source originale</a> |
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</p> |
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</nav> |
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<hr> |
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<p>"RSS is dead" every year; it will be dead in the next year again. But before the dead coming in next year, we can do something to make it dead in an elegant way.</p> |
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<p>RSS feed is meant to be used by machine (apps) not by human. But people may visit a feed link directly and shout out WTF is this.</p> |
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<p>The RSS feed however can be human friendly. Take an example of my blog's RSS feed. It is simple and clean, not so scary to ordinary people.</p> |
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<div class="md-photo"><figure><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://i.typlog.com/lepture/8424206380_291282.jpg" alt="My blog feed UI" title="My blog feed UI"><figcaption>My blog feed UI</figcaption></figure></div> |
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<h2 id="toc_1" class="md-block">XSL URL</h2> |
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<div class="md-block blockquote"><blockquote><p>But how can we make a RSS feed look like the above UI?</p> |
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</blockquote></div> |
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<p>We added this UI in <a href="https://typlog.com/">Typlog</a> recently. It is pretty simple with <a href="https://www.w3.org/Style/XSL/"><strong>xsl</strong></a>. I'm not going to explain XSL in this post, instead, we can quickly decorate our RSS feeds with the famous copy paste method.</p> |
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<div class="highlight"><pre><span></span><span class="cp"><?xml version="1.0" encoding="UTF-8"?></span> |
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<span class="cp"><?xml-stylesheet href="/rss.xsl" type="text/xsl"?></span> |
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<span class="nt"><rss</span> <span class="na">version=</span><span class="s">"2.0"</span><span class="nt">></span> |
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</pre></div> |
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<p>Here you can see, the feed is styled by an external file <code>/rss.xsl</code>. Note here, instead of providing a shared URL <code>typlog.com/rss.xsl</code>, we are using a relative path here. Because it is required by some browsers for security reasons; we need to put the xsl file under the same domain, protocol and port with the RSS feed.</p> |
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<p>Next, we can inspect the source code of <code>rss.xsl</code>:</p> |
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<div class="md-block pre"><pre><code>view-source:https://lepture.com/rss.xsl</code></pre></div> |
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<h2 id="toc_2" class="md-block">XSL Template</h2> |
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<p>Here is an overview of the XSL file:</p> |
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<div class="highlight"><pre><span></span><span class="cp"><?xml version="1.0" encoding="utf-8"?></span> |
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<span class="nt"><xsl:stylesheet</span> <span class="na">version=</span><span class="s">"3.0"</span> <span class="na">xmlns:xsl=</span><span class="s">"http://www.w3.org/1999/XSL/Transform"</span> |
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<span class="na">xmlns:atom=</span><span class="s">"http://www.w3.org/2005/Atom"</span><span class="nt">></span> |
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<span class="nt"><xsl:output</span> <span class="na">method=</span><span class="s">"html"</span> <span class="na">version=</span><span class="s">"1.0"</span> <span class="na">encoding=</span><span class="s">"UTF-8"</span> <span class="na">indent=</span><span class="s">"yes"</span><span class="nt">/></span> |
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<span class="nt"><xsl:template</span> <span class="na">match=</span><span class="s">"/"</span><span class="nt">></span> |
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... |
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<span class="nt"></xsl:template></span> |
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<span class="nt"></xsl:stylesheet></span> |
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</pre></div> |
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<p>Things to do:</p> |
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<div class="md-block list"><ol> |
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<li>XML namespaces: register the required namespace when you need to select it via xpath.</li> |
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<li>XSL template: create the UI in XHTML</li> |
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</ol></div> |
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<h2 id="toc_3" class="md-block">XSL Methods</h2> |
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<p>We will use some XSL methods to create our XHTML template:</p> |
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<div class="md-block list"><ol> |
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<li><code>xsl:if</code></li> |
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<li><code>xsl:for-each</code></li> |
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<li><code>xsl:attribute</code></li> |
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<li><code>xsl:value-of</code></li> |
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</ol></div> |
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<p>Take a look at <code>https://lepture.com/rss.xsl</code>, follow the example. It is not hard to create a pretty UI for RSS feed.</p> |
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</article> |
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<hr> |
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<footer> |
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<p> |
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<a href="/david/" title="Aller à l’accueil"><svg class="icon icon-home"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-home"></use> |
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</svg> Accueil</a> • |
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<a href="/david/log/" title="Accès au flux RSS"><svg class="icon icon-rss2"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-rss2"></use> |
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</svg> RSS</a> • |
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<a href="http://larlet.com" title="Go to my English profile" data-instant><svg class="icon icon-user-tie"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-user-tie"></use> |
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</svg> Pro</a> • |
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<a href="mailto:david%40larlet.fr" title="Envoyer un courriel"><svg class="icon icon-mail"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-mail"></use> |
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</svg> Email</a> • |
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<abbr class="nowrap" title="Hébergeur : Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33184162340"><svg class="icon icon-hammer2"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-hammer2"></use> |
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</svg> Légal</abbr> |
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</p> |
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<template id="theme-selector"> |
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<form> |
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<fieldset> |
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<legend><svg class="icon icon-brightness-contrast"> |
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<use xlink:href="/static/david/icons2/symbol-defs.svg#icon-brightness-contrast"></use> |
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</svg> Thème</legend> |
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<label> |
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<input type="radio" value="auto" name="chosen-color-scheme" checked> Auto |
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</label> |
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<label> |
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<input type="radio" value="dark" name="chosen-color-scheme"> Foncé |
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</label> |
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<label> |
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<input type="radio" value="light" name="chosen-color-scheme"> Clair |
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</label> |
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</fieldset> |
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</form> |
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</template> |
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</footer> |
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<script> |
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function loadThemeForm(templateName) { |
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const themeSelectorTemplate = document.querySelector(templateName) |
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const form = themeSelectorTemplate.content.firstElementChild |
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themeSelectorTemplate.replaceWith(form) |
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form.addEventListener('change', (e) => { |
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const chosenColorScheme = e.target.value |
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localStorage.setItem('theme', chosenColorScheme) |
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toggleTheme(chosenColorScheme) |
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}) |
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const selectedTheme = localStorage.getItem('theme') |
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if (selectedTheme && selectedTheme !== 'undefined') { |
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form.querySelector(`[value="${selectedTheme}"]`).checked = true |
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} |
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} |
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const prefersColorSchemeDark = '(prefers-color-scheme: dark)' |
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window.addEventListener('load', () => { |
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let hasDarkRules = false |
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for (const styleSheet of Array.from(document.styleSheets)) { |
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let mediaRules = [] |
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for (const cssRule of styleSheet.cssRules) { |
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if (cssRule.type !== CSSRule.MEDIA_RULE) { |
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continue |
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} |
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// WARNING: Safari does not have/supports `conditionText`. |
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if (cssRule.conditionText) { |
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if (cssRule.conditionText !== prefersColorSchemeDark) { |
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continue |
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} |
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} else { |
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if (cssRule.cssText.startsWith(prefersColorSchemeDark)) { |
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continue |
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} |
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} |
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mediaRules = mediaRules.concat(Array.from(cssRule.cssRules)) |
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} |
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// WARNING: do not try to insert a Rule to a styleSheet you are |
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// currently iterating on, otherwise the browser will be stuck |
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// in a infinite loop… |
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for (const mediaRule of mediaRules) { |
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styleSheet.insertRule(mediaRule.cssText) |
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hasDarkRules = true |
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} |
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} |
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if (hasDarkRules) { |
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loadThemeForm('#theme-selector') |
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} |
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}) |
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</script> |
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</body> |
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</html> |
