Detect Dark Mode Preference with JavaScript

By  on  

Seemingly every website, dapp, and app offers a dark mode preference, and thank goodness. Dark mode is especially useful when I'm doing late night coding, or even worse, trading into altcoins. I'm presently working on implementing a dark theme on MetaMask and it got me to thinking: is there a way we can default to dark mode if the user's operating system also defaults to dark mode?

You can determine if the user's operating system prefers dark mode with one quick line of code:

const prefersDarkMode = window.matchMedia("(prefers-color-scheme:dark)").matches; // true

This code snippet takes advantage of the CSS prefers-color-scheme media query with JavaScript's matchMedia API.

From a user experience standpoint, you'll need to be careful in using this snippet. This method is great for setting a default for new users without changing the value for existing users.

Recent Features

Incredible Demos

  • By
    Adding Events to Adding Events in MooTools

    Note: This post has been updated. One of my huge web peeves is when an element has click events attached to it but the element doesn't sport the "pointer" cursor. I mean how the hell is the user supposed to know they can/should click on...

  • By
    Create a Simple Dojo Accordion

    Let's be honest:  even though we all giggle about how cheap of a thrill JavaScript accordions have become on the web, they remain an effective, useful widget.  Lots of content, small amount of space.  Dojo's Dijit library provides an incredibly simply method by which you can...

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!