Bootstrap Dark Mode

This project provides a stylesheet and two scripts that allow you to implement Dark Mode on your website. It is initially loaded based on user preference, can be toggled via a switch, and is saved via localStorage.

You can view the test page with all default bootstrap components in light and dark (thanks to juzraai!).

Note that not all components are fully supported yet. Mostly the contextual color classes can cause problems.

If you are using Angular, check out ng-bootstrap-darkmode.

Usage

With NPM/Yarn/PNPM

Install the npm package:

$ npm install bootstrap-darkmode
$ yarn add bootstrap-darkmode
$ pnpm install bootstrap-darkmode

Include the stylesheet, e.g. in styles.scss:

@import "~bootstrap-darkmode/darktheme";

Via unpkg.com

Put the stylesheet link in <head>. Do not forget to add bootstrap.

<head>
    <!-- ... -->
    <!-- Bootstrap CSS ... -->

    <!-- Dark mode CSS -->
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/darktheme.css"/>
    <!-- ... -->
</head>

Load the theme script as the first thing in <body>.

<body>
<script src="https://unpkg.com/[email protected]/dist/theme.js"></script>
<!-- ... --->

Building Yourself

Clone this repo.
Run npm build.
Find darktheme.css and theme.js in the dist/ directory.
Follow the steps for unpkg.com, but replace the links with whatever local paths you put the files in.

Setup

If you are using ng-bootstrap-darkmode, you can skip this section entirely. It comes with its own JavaScript implementation that is used very differently.

Theme

As soon as possible after <body>, initialize the config and load the theme:

const themeConfig = new ThemeConfig();
// place customizations here
themeConfig.initTheme();

Loading the theme early shortens the time until the white default background becomes dark.

Dark Switch

If you want to use the default dark switch, load the switch script and add the element using this code:

// this will write the html to the document and return the element.
const darkSwitch = writeDarkSwitch(themeConfig);

Configuration

You can listen to theme changes by registering a callback with themeChangeHandlers:

config.themeChangeHandlers.push(theme => console.log(`using theme: ${theme}`));

To change the way the theme is persisted, you can change the loadTheme and saveTheme functions:

themeConfig.loadTheme = () => {
    // custom logic
    return 'dark';
};

themeConfig.saveTheme = theme => {
    // custom logic
    console.log(theme);
};

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