MediaWiki:Common.js

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mw.loader.using(['mediawiki.util']).then(function () {
  $(function () {

    console.log("BASELINE JS OK");

    // ORIGINAL WORKING SELECT DROPDOWNS
    document.querySelectorAll('.mw-dropdown-ui').forEach(container => {
      const select = container.querySelector('select');
      const sections = container.querySelectorAll('.dropdown-section');

      if (!select) return;

      select.addEventListener('change', function () {
        sections.forEach(s => s.style.display = 'none');

        const target = container.querySelector('#' + this.value);
        if (target) target.style.display = 'block';
      });
    });

  });
});