Bootstrap Darkmode
This project provides a stylesheet and two scripts that allow you to implement a dark theme 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!).
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/scss/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]/css/darktheme.css"/> <!-- ... --> </head>
-
Load the theme script as the first thing in
<body>.<body> <script src="https://unpkg.com/[email protected]/bundles/bootstrap-darkmode.umd.js"></script> <!-- ... --->
Building Yourself
- Clone this repo.
- Run
npm build. - Find
darktheme.cssandtheme.jsin thedist/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.
Import
ES module import:
import {ThemeConfig, writeDarkSwitch} from 'bootstrap-darkmode';
Browser:
const bootstrapDarkmode = window['bootstrap-darkmode'];
const ThemeConfig = bootstrapDarkmode.ThemeConfig;
const writeDarkSwitch = bootstrapDarkmode.writeDarkSwitch;
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
Bootstrap Darkmode can be configured regarding both colors and the way the JavaScript helper behaves.
SCSS
Many colors can be changed via SCSS variables, similar to how Bootstrap allows changing the theme. You can find all variables in _variables.scss. To change them, just put a new value before importing darktheme.scss.
$dark-body-bg: #111;
@import "~bootstrap-darkmode/scss/darktheme";
JavaScript
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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