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  1. <!doctype html><!-- This is a valid HTML5 document. -->
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  12. <title>How to style RSS feed (archive) — David Larlet</title>
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  55. <link rel="canonical" href="https://lepture.com/en/2019/rss-style-with-xsl">
  56. <body class="remarkdown h1-underline h2-underline h3-underline em-underscore hr-center ul-star pre-tick" data-instant-intensity="viewport-all">
  57. <article>
  58. <header>
  59. <h1>How to style RSS feed</h1>
  60. </header>
  61. <nav>
  62. <p class="center">
  63. <a href="/david/" title="Aller à l’accueil"><svg class="icon icon-home">
  64. <use xlink:href="/static/david/icons2/symbol-defs.svg#icon-home"></use>
  65. </svg> Accueil</a> •
  66. <a href="https://lepture.com/en/2019/rss-style-with-xsl" title="Lien vers le contenu original">Source originale</a>
  67. </p>
  68. </nav>
  69. <hr>
  70. <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>
  71. <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>
  72. <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>
  73. <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>
  74. <h2 id="toc_1" class="md-block">XSL URL</h2>
  75. <div class="md-block blockquote"><blockquote><p>But how can we make a RSS feed look like the above UI?</p>
  76. </blockquote></div>
  77. <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>
  78. <div class="highlight"><pre><span></span><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
  79. <span class="cp">&lt;?xml-stylesheet href="/rss.xsl" type="text/xsl"?&gt;</span>
  80. <span class="nt">&lt;rss</span> <span class="na">version=</span><span class="s">"2.0"</span><span class="nt">&gt;</span>
  81. </pre></div>
  82. <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>
  83. <p>Next, we can inspect the source code of <code>rss.xsl</code>:</p>
  84. <div class="md-block pre"><pre><code>view-source:https://lepture.com/rss.xsl</code></pre></div>
  85. <h2 id="toc_2" class="md-block">XSL Template</h2>
  86. <p>Here is an overview of the XSL file:</p>
  87. <div class="highlight"><pre><span></span><span class="cp">&lt;?xml version="1.0" encoding="utf-8"?&gt;</span>
  88. <span class="nt">&lt;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>
  89. <span class="na">xmlns:atom=</span><span class="s">"http://www.w3.org/2005/Atom"</span><span class="nt">&gt;</span>
  90. <span class="nt">&lt;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">/&gt;</span>
  91. <span class="nt">&lt;xsl:template</span> <span class="na">match=</span><span class="s">"/"</span><span class="nt">&gt;</span>
  92. ...
  93. <span class="nt">&lt;/xsl:template&gt;</span>
  94. <span class="nt">&lt;/xsl:stylesheet&gt;</span>
  95. </pre></div>
  96. <p>Things to do:</p>
  97. <div class="md-block list"><ol>
  98. <li>XML namespaces: register the required namespace when you need to select it via xpath.</li>
  99. <li>XSL template: create the UI in XHTML</li>
  100. </ol></div>
  101. <h2 id="toc_3" class="md-block">XSL Methods</h2>
  102. <p>We will use some XSL methods to create our XHTML template:</p>
  103. <div class="md-block list"><ol>
  104. <li><code>xsl:if</code></li>
  105. <li><code>xsl:for-each</code></li>
  106. <li><code>xsl:attribute</code></li>
  107. <li><code>xsl:value-of</code></li>
  108. </ol></div>
  109. <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>
  110. </article>
  111. <hr>
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  115. <use xlink:href="/static/david/icons2/symbol-defs.svg#icon-home"></use>
  116. </svg> Accueil</a> •
  117. <a href="/david/log/" title="Accès au flux RSS"><svg class="icon icon-rss2">
  118. <use xlink:href="/static/david/icons2/symbol-defs.svg#icon-rss2"></use>
  119. </svg> Suivre</a> •
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  147. </template>
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  152. const themeSelectorTemplate = document.querySelector(templateName)
  153. const form = themeSelectorTemplate.content.firstElementChild
  154. themeSelectorTemplate.replaceWith(form)
  155. form.addEventListener('change', (e) => {
  156. const chosenColorScheme = e.target.value
  157. localStorage.setItem('theme', chosenColorScheme)
  158. toggleTheme(chosenColorScheme)
  159. })
  160. const selectedTheme = localStorage.getItem('theme')
  161. if (selectedTheme && selectedTheme !== 'undefined') {
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  165. const prefersColorSchemeDark = '(prefers-color-scheme: dark)'
  166. window.addEventListener('load', () => {
  167. let hasDarkRules = false
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  169. let mediaRules = []
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  171. if (cssRule.type !== CSSRule.MEDIA_RULE) {
  172. continue
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  180. if (cssRule.cssText.startsWith(prefersColorSchemeDark)) {
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  183. }
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  185. }
  186. // WARNING: do not try to insert a Rule to a styleSheet you are
  187. // currently iterating on, otherwise the browser will be stuck
  188. // in a infinite loop…
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  190. styleSheet.insertRule(mediaRule.cssText)
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  199. </body>
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