JavaScript and CSS allow users to detect the user theme preference with CSS’ prefers-color-scheme media query. It’s standard these days to use that preference to show the dark or light theme on a given website. But what if the user changes their preference while using your app?
To detect a system theme preference change using JavaScript, you need to combine matchMedia, prefers-color-scheme, and an event listener:
window.matchMedia('(prefers-color-scheme: dark)')
.addEventListener('change',({ matches }) => {
if (matches) {
console.log("change to dark mode!")
} else {
console.log("change to light mode!")
}
})
The change event of the matchMedia API notifies you when the system preference changes. You can use this event to automatically update the site’s display in real time.
I love that this API allows detecting user preference on a system level. Catering to user needs is an important part of creating a great web experience!
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