React DACHSwitch 🏔️

A lightweight, aesthetic, and reusable React component for country-based content filtering, specifically designed for the DACH region (Germany 🇩🇪, Austria 🇦🇹, Switzerland 🇨🇭).

Features

• Zero Dependencies (besides React/ReactDOM)
• DOM-based Filtering: Works with any HTML structure, not just React components.
• Plug & Play: Drop it in, and it automatically works on elements with data-country (customizable).
• Customizable: Supports single-select, multi-select, and "Select All" modes.
• Flexible: Filter by standard data attributes or custom attributes (like lang or data-market).
• Aesthetic: Built with modern UI principles (Tailwind-ready).

Installation

npm install react-dachswitch

Styling (Important)

This component uses Tailwind CSS classes. For the styles to appear correctly, you must include the package in your tailwind.config.js content array so Tailwind scans it for class names:

// tailwind.config.js
module.exports = {
  content: [
    "./src/**/*.{js,jsx,ts,tsx}",
    // Add this line:
    "./node_modules/react-dachswitch/**/*.{js,ts,jsx,tsx}"
  ],
  theme: {
    extend: {},
  },
  plugins: [],
}

Usage

1. Tag your content: Add a data-country attribute to the elements you want to filter.
2. Add the Switch: Place the component in your app.

import { DACHSwitch } from 'react-dachswitch';

function App() {
  return (
    <div>
      {/* Automatically finds all [data-country] elements */}
      <DACHSwitch />

      <div className="grid">
        <div data-country="DE">German Product</div>
        <div data-country="AT">Austrian Product</div>
        <div data-country="CH">Swiss Product</div>
      </div>
    </div>
  );
}

Configuration (Props)

Advanced Usage

Using Custom Attributes

If your site uses lang attributes or a different data attribute, you can override it:

<DACHSwitch countryCodeAttribute="lang" />

<div lang="DE">...</div>
<div lang="AT">...</div>

Using with Astro 🚀

Astro components are static by default. To enable the interactive filtering features of DACHSwitch, you must hydrate the component using a client:* directive. client:load is recommended so the content filters immediately upon page load.

---
import { DACHSwitch } from 'react-dachswitch';
---

<header>
  <!-- 'client:load' ensures React hydrates this component immediately -->
  <DACHSwitch client:load />
</header>

<main>
  <article data-country="DE">
    <h2>Nachrichten aus Deutschland</h2>
  </article>
  
  <article data-country="CH">
    <h2>Nachrichten aus der Schweiz</h2>
  </article>
</main>

Scripted Initialization (e.g., IP Detection)

You can set the active country based on the user's location or browser language by fetching the data first and then rendering the component with defaultAllActive={false} and the detected country as defaultActive.

const [initialCountry, setInitialCountry] = useState<string | null>(null);

useEffect(() => {
  // Your detection logic here
  const userRegion = detectRegion(); // e.g., returns 'AT'
  setInitialCountry(userRegion);
}, []);

if (!initialCountry) return <div>Loading...</div>;

return (
  <DACHSwitch 
    defaultAllActive={false}
    defaultActive={initialCountry}
  />
);

Development & Testing

This project uses Vitest for unit testing.

1. Install dependencies: npm install
2. Run tests: npm test

Publishing

1. Build the library: npm run build:lib
2. Publish: npm publish

Hosting the Demo

To build the demo application (e.g., for GitHub Pages):

1. npm run build:demo
2. The output will be in the build/ directory.

License

MIT