Injector

Stable Class

What it does

Injector interface

How to use

<code>const injector: Injector = ...;
injector.get(...);
</code>

Class Overview

class Injector {
  staticTHROW_IF_NOT_FOUND : _THROW_IF_NOT_FOUND
  staticNULL : Injector
  get(token: any, notFoundValue?: any) : any
}

Class Description

For more details, see the Dependency Injection Guide.

Example

const injector: Injector =
    ReflectiveInjector.resolveAndCreate([{provide: 'validToken', useValue: 'Value'}]);
expect(injector.get('validToken')).toEqual('Value');
expect(() => injector.get('invalidToken')).toThrowError();
expect(injector.get('invalidToken', 'notFound')).toEqual('notFound');

Injector returns itself when given Injector as a token:

const injector = ReflectiveInjector.resolveAndCreate([]);
expect(injector.get(Injector)).toBe(injector);

Static Members

THROW_IF_NOT_FOUND : _THROW_IF_NOT_FOUND

NULL : Injector

Class Details

get(token: any, notFoundValue?: any) : any

Retrieves an instance from the injector based on the provided token. If not found:

Throws NoProviderError if no notFoundValue that is not equal to Injector.THROW_IF_NOT_FOUND is given
Returns the notFoundValue otherwise ```

exported from @angular/core/index, defined in @angular/core/src/di/injector.ts

Links:

https://angular.io/docs/ts/latest/api/core/index/Injector-class.html

doc_Angular

2025-01-10 15:47:30

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