d2395fda44
Each target reads the theme from ?theme=dark|light on load and applies it to data-theme before first paint. A MutationObserver syncs theme changes back to the URL via replaceState, and a click handler appends ?theme= to cross-port navigation links automatically. The outer iframe shell (dev/index.html) uses postMessage to track theme changes from iframes and passes the param when switching tabs. For hiccup, the server also reads ?theme= and sets data-theme on the <html> element server-side to prevent any flash of wrong theme.
51 lines
1.7 KiB
HTML
51 lines
1.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<link rel="stylesheet" href="/theme.css" />
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<style>
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html, body { margin: 0; padding: 0; }
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</style>
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<script>
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(function() {
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var params = new URLSearchParams(window.location.search);
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var theme = params.get('theme');
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if (theme === 'dark' || theme === 'light') {
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document.documentElement.dataset.theme = theme;
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}
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new MutationObserver(function(mutations) {
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for (var i = 0; i < mutations.length; i++) {
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if (mutations[i].attributeName === 'data-theme') {
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var t = document.documentElement.dataset.theme;
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var url = new URL(window.location);
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if (t) url.searchParams.set('theme', t);
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else url.searchParams.delete('theme');
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history.replaceState(null, '', url);
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if (window.parent !== window) {
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window.parent.postMessage({ type: 'theme-change', theme: t || '' }, '*');
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}
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}
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}
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}).observe(document.documentElement, { attributes: true, attributeFilter: ['data-theme'] });
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document.addEventListener('click', function(e) {
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var a = e.target.closest('a[href]');
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if (!a) return;
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try {
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var url = new URL(a.href);
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if (url.hostname === location.hostname && url.port !== location.port) {
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var t = document.documentElement.dataset.theme;
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if (t) url.searchParams.set('theme', t);
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a.href = url.toString();
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}
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} catch (ex) {}
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});
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})();
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</script>
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</head>
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<body>
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<div id="app"></div>
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<script src="/js/main.js"></script>
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</body>
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</html>
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