42 lines
993 B
TypeScript
42 lines
993 B
TypeScript
type Theme = 'light' | 'dark';
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const STORAGE_KEY = 'theme';
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const getSavedTheme = (): Theme => {
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const raw = localStorage.getItem(STORAGE_KEY);
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if (raw === 'light' || raw === 'dark') {
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return raw;
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}
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return 'dark';
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};
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const applyTheme = (theme: Theme): void => {
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document.documentElement.setAttribute('data-theme', theme);
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localStorage.setItem(STORAGE_KEY, theme);
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};
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const cycleTheme = (): void => {
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const current = getSavedTheme();
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const next: Theme = current === 'light' ? 'dark' : 'light';
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applyTheme(next);
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};
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const initTheme = (): void => {
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const saved = getSavedTheme();
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applyTheme(saved);
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document.addEventListener('click', e => {
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const target = e.target as HTMLElement;
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const btn = target.closest('#theme-toggle, #footer-theme-toggle') as HTMLButtonElement | null;
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if (btn) {
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cycleTheme();
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}
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});
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};
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', initTheme);
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} else {
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initTheme();
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}
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