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A React JSX device theme selector function that updates itself upon device theme update. Updates Realtime.
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| const useThemeDetector = () => { | |
| const getCurrentTheme = () => { | |
| if (window.matchMedia("(prefers-color-scheme: dark)").matches) { | |
| return "dark"; | |
| } | |
| return "light"; | |
| } | |
| const [theme, setTheme] = useState (getCurrentTheme()); | |
| document.querySelector("body").setAttribute("data-theme", theme); | |
| localStorage.setItem("theme", theme); | |
| useEffect(() => { | |
| const darkThemeMq = window.matchMedia("(prefers-color-scheme: dark)"); | |
| darkThemeMq.addListener(e => { | |
| setTheme(e.matches ? "dark" : "light") | |
| }); | |
| return () => darkThemeMq.removeListener(e => { | |
| setTheme(e.matches ? "dark" : "light") | |
| }); | |
| }, []); | |
| return theme; | |
| } |
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