APP_ID
A DI token representing a string ID, used
primarily for prefixing application attributes and CSS styles when
ViewEncapsulation#Emulated is being used.
const APP_ID: InjectionToken<string>;
Description
The token is needed in cases when multiple applications are bootstrapped on a page
(for example, using bootstrapApplication calls). In this case, ensure that those applications
have different APP_ID value setup. For example:
bootstrapApplication(ComponentA, {
providers: [
{ provide: APP_ID, useValue: 'app-a' },
// ... other providers ...
]
});
bootstrapApplication(ComponentB, {
providers: [
{ provide: APP_ID, useValue: 'app-b' },
// ... other providers ...
]
});
By default, when there is only one application bootstrapped, you don't need to provide the
APP_ID token (the ng will be used as an app ID).