oliverdavies.uk/content/node.1d8e5d0f-d0d9-4e9d-8c05-87ab91016bd5.yml

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title:
- value: 'CSS, data attributes and feature flags'
created:
- value: '2024-08-25T00:00:00+00:00'
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body:
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<p>I recently used <a href="https://www.drupal.org/project/feature_toggle">Drupal's Feature Toggle module</a> to set a data attribute which enabled some new styling for buttons.</p>
<p>Firstly, within the theme's .theme file, I added this code:</p>
<pre><code class="php">/**
* Implements hook_preprocess_html().
*/
function mytheme_preprocess_html(array &amp;$variables): void {
$variables['attributes']['data-use-new-button-styles'] = \Drupal::service('feature_toggle.feature_status')-&gt;getStatus('use_the_new_button_styling');
}
</code></pre>
<p>If the feature toggle is enabled, it adds a <code>data-use-new-button-styles=""</code> attribute to the <code>body</code> element.</p>
<p>If it is disabled, the attribute is not added, so I can write CSS that's applied when the data attribute is present:</p>
<pre><code class="css">[data-use-new-button-styles] .btn-primary {
background-color: red;
}
</code></pre>
<p>In a Tailwind CSS project (this isn't), the same could be achiveable with a custom interaction state - similar to <code>hover</code>, <code>focus</code> and <code>active</code>. Something like <code>new-button-styles:bg-red-500</code>.</p>
<p>I like using feature flags and was happy to find a way to use them when adding this new CSS.</p>
format: full_html
processed: |
<p>I recently used <a href="https://www.drupal.org/project/feature_toggle">Drupal's Feature Toggle module</a> to set a data attribute which enabled some new styling for buttons.</p>
<p>Firstly, within the theme's .theme file, I added this code:</p>
<pre><code class="php">/**
* Implements hook_preprocess_html().
*/
function mytheme_preprocess_html(array &amp;$variables): void {
$variables['attributes']['data-use-new-button-styles'] = \Drupal::service('feature_toggle.feature_status')-&gt;getStatus('use_the_new_button_styling');
}
</code></pre>
<p>If the feature toggle is enabled, it adds a <code>data-use-new-button-styles=""</code> attribute to the <code>body</code> element.</p>
<p>If it is disabled, the attribute is not added, so I can write CSS that's applied when the data attribute is present:</p>
<pre><code class="css">[data-use-new-button-styles] .btn-primary {
background-color: red;
}
</code></pre>
<p>In a Tailwind CSS project (this isn't), the same could be achiveable with a custom interaction state - similar to <code>hover</code>, <code>focus</code> and <code>active</code>. Something like <code>new-button-styles:bg-red-500</code>.</p>
<p>I like using feature flags and was happy to find a way to use them when adding this new CSS.</p>
summary: null
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