NgBootstrapDarkmode

An Angular wrapper for bootstrap-darkmode.

Installation

Install the module:

$ npm install ng-bootstrap-darkmode bootstrap-darkmode

Include darkmode css (in styles.scss):

@import "~bootstrap-darkmode/darktheme";

Alternatively, if you are not using SCSS, add the following in angular.json under projects.<yourProject>.architect.build.options.styles:

"styles": [
  // ...
  "../node_modules/bootstrap-darkmode/dist/darktheme.css"
]

Usage

Module Import

import {NgBootstrapDarkmodeModule} from 'ng-bootstrap-darkmode';

@NgModule({
  imports: [
    // ...
    NgBootstrapDarkmodeModule,
  ],
  // ...
})
export class AppModule {
}

Theme Switcher

To include the theme switcher, which allows selections between light, dark and automatic (user agent preference) mode:

<ngbd-theme-switch></ngbd-theme-switch>

The theme switcher can be customized with the optional [size] and [style] attributes:

<ngbd-theme-switch size="sm"></ngbd-theme-switch>
<ngbd-theme-switch size="md"></ngbd-theme-switch>
<ngbd-theme-switch size="lg"></ngbd-theme-switch>
<ngbd-theme-switch [size]="userPrefersLargeElements ? 'lg' : 'md'"></ngbd-theme-switch>

<ngbd-theme-switch style="icon"></ngbd-theme-switch>
<ngbd-theme-switch style="label"></ngbd-theme-switch>
<ngbd-theme-switch [style]="userPrefersLabelsOverIcons ? 'label' : 'icon'"></ngbd-theme-switch>

An outdated alternative is the dark mode switch, which does not support automatic mode:

<ngbd-darkmode-switch></ngbd-darkmode-switch>

Subscribing to the Theme

import {ThemeService} from 'ng-bootstrap-darkmode';

@Injectable()
export class MyService {
  constructor(
    themeService: ThemeService,
  ) {
    themeService.theme$.subscribe(theme => console.log(theme));
  }
}

Configuring Persistence

By default, this library persists the currently selected theme using the key theme in localStorage. You can customize how this behaviour using dependency injection. Just provide the THEME_SAVER and THEME_LOADER functions in your module:

import {of} from 'rxjs';

import {NgBootstrapDarkmodeModule, THEME_LOADER, THEME_SAVER} from 'ng-bootstrap-darkmode';

@NgModule({
  imports: [
    // ...
    NgBootstrapDarkmodeModule,
  ],
  providers: [
    {
      provide: THEME_LOADER,
      useValue: () => of('light'),
    },
    {
      provide: THEME_SAVER,
      useValue: (theme) => console.log('saving', theme),
    },
  ],
  // ...
})
export class AppModule {
}