File size: 1,391 Bytes
fee9c1e fef84f3 fee9c1e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | ---
import sunIconUrl from "../assets/images/sun.svg?url";
import moonIconUrl from "../assets/images/moon.svg?url";
---
<button id="theme-toggle" aria-label="Toggle color theme">
<img class="icon light" src={sunIconUrl} alt="light" width="20" height="20" />
<img class="icon dark" src={moonIconUrl} alt="dark" width="20" height="20" />
<script>
const btn = document.getElementById('theme-toggle');
const media = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)');
const prefersDark = media && media.matches;
const saved = localStorage.getItem('theme'); // 'light' | 'dark' | null
const apply = (mode) => {
document.documentElement.dataset.theme = mode;
};
// Initial mode: default to light, then use localStorage, else system
apply(saved || (prefersDark ? 'dark' : 'light'));
// If user hasn't chosen manually, follow system changes
if (!saved && media) {
const syncWithSystem = (e) => apply(e.matches ? 'dark' : 'light');
if (media.addEventListener) media.addEventListener('change', syncWithSystem);
else if (media.addListener) media.addListener(syncWithSystem);
}
btn.addEventListener('click', () => {
const next = (document.documentElement.dataset.theme === 'dark') ? 'light' : 'dark';
localStorage.setItem('theme', next);
apply(next);
});
</script>
</button>
|