Super Simple CSS Dark Theme Switching Toggler In JavaScript

Dark Mode Switcheroo is a very simple CSS dark/light mode switcher with preferences saved via local storage and dynamic OS setup detection. Zero dependencies and only 500 bytes gzipped!

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To Do

Support more than two themes
Best primer docs
Add the onChange (or onToggle etc.) callback function passed as an option

How to make use of it:

1. Install and import it with NPM.

# Yarn
$ yarn add @jakejarvis/dark-mode

# NPM
$ npm i @jakejarvis/dark-mode --save

import { init } from "@jakejarvis/dark-mode";

2. Or embrace the UMD model of the library on the web page.

<script src=”./dist/dark-mode.min.js”></script>
<!– or use CDN: https://unpkg.com/@jakejarvis/dark-mode/dist/dark-mode.min.js –>

3. Define your individual darkish and lightweight themes within the CSS.

/* Light theme */
body.light {
  background-color: #fff;
  color: #222;
}
body.light a {
  color: #06f;
}
/* Dark theme */
body.dark {
  background-color: #222;
  color: #fff;
}
body.dark a {
  color: #fe0;
}

4. Create a toggle button to change between Dark & Light themes.

<button class="dark-mode-toggle">
  Toggle
</button>

.dark-mode-toggle {
  padding: 1em;
  cursor: pointer;
  /* Hide the toggle initially if the user's JS is disabled: */
  visibility: hidden;
}

5. Initialize the library.

window.darkMode.init({
  toggle: document.querySelector(".dark-mode-toggle"),
  classes: {
    light: "light",
    dark: "dark",
  },
  default: "light", // default theme name
  storageKey: "dark_mode_pref",
});

6. Callback features.

window.darkMode.init({
  onInit: function (toggle) {
    toggle.style.visibility = "visible";
  },
  onChange: function (theme, toggle) {
    console.log("Theme is now " + theme);
  },
});

Simple CSS Dark Mode Theme Toggler In JavaScript, Dark Mode Switcheroo Plugin/Github