How Can JavaScript Detect and Apply Dark Mode to Stripe Elements?

Detecting Dark Mode in JavaScript

Modern operating systems like Windows and macOS offer dark mode options. While CSS provides a way to detect dark mode preference using @media (prefers-dark-interface), JavaScript developers need an alternative solution.

JavaScript Detection

To detect the preferred color scheme in JavaScript, you can use the window.matchMedia() API. The following code checks for dark mode:

if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
    // dark mode
}

Watching for Changes

You can also listen for changes to the preferred color scheme:

window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
    const newColorScheme = event.matches ? "dark" : "light";
});

Application to Stripe Elements

To apply this detection to Stripe Elements, modify the stripeElementStyles object dynamically based on the preferred color scheme. For example:

if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
    stripeElementStyles.base.color = COLORS.lightGrey;
} else {
    stripeElementStyles.base.color = COLORS.darkGrey;
}

This ensures that your Stripe Elements are styled appropriately for dark mode or light mode based on the user's operating system preferences.

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