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Test observable 'next' callback in RxJs and Angular


Test observable 'next' callback in RxJs and Angular

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Test observable 'next' callback in RxJs and Angular
Tag : angular , By : Doc Immortal
Date : November 29 2020, 04:01 AM

wish help you to fix your issue I put together a simple Stackblitz to show you how I would approach testing that simple component method you describe.
Here is the spec from that Stackblitz:
it(`works with "of" 'cuz I want it to`, () => {
    spyOn(someService, 'methodReturningObservable').and.returnValue(of(10));
    component.somethingOrOther();
    expect(component.testMe).toBe(10);
});
it(`works with "cold" 'cuz I want it to`, () => {
    spyOn(someService, 'methodReturningObservable').and.returnValue(cold('a', { a: 10 }));
    component.somethingOrOther();
    getTestScheduler().flush(); // flush the observables
    expect(component.testMe).toBe(10);
});

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Registering onError Callback on RxJS Observable causing same http request to be sent twice in Angular 2


Tag : http , By : judith
Date : March 29 2020, 07:55 AM
should help you out It seems the subject is registering subscribe() multiple times. Could you try unsubscribing the observable once the response through observable is returned back? Else, you may go for simpler way of creating a new observable during every intercept() call and return it instead to avoid multiple callbacks being registered.

method VS () => method() - Angular 2 done() callback function subscribe Observable RxJS


Tag : angular , By : Mark W
Date : March 29 2020, 07:55 AM
Any of those help That's because when you write this.loadQuestion you're passing a reference to the function loadQuestion but you'll be losing the this context. When you use the arrow function, the this context will be kept.
You could also write this.loadQuestion.bind(this) to obtain a loadQuestion function with the this context fixed to the current one.

Angular jasmine test not able to trigger Observable created with fromEvent rxjs operator


Tag : angular , By : JSebok
Date : March 29 2020, 07:55 AM
Hope that helps Eventually I found a way to fire events that can be used within the fromEvent function of RxJs.
The solution has been inspired by this post.
child.triggerEventHandler('click', 'clicked');
child.nativeElement.dispatchEvent(new MouseEvent('click', {...});

filter a single value with RxJS in and return an observable and use the observable via async in a template in Angular


Tag : javascript , By : user135518
Date : March 29 2020, 07:55 AM
wish of those help I have a Angular service which correctly return a JSON object via the Angular httpClient. Via an observable I want to read a value of the JSON object in a template in an input field via async. , I thought you almost had it the first time:
this.verBeterEuro$ = this.improvementService.improvementSubject.pipe(
  map(
    (y) => {
      const v = y.verbetering.find(vi => vi.entiteit === 'T');
      return v.verbeteringBedrag;
    }
  )
);

Angular js 2 'node_modules/rxjs/Observable"' has no exported member 'Observable'. import Observable


Tag : angular , By : Tom Berthon
Date : March 29 2020, 07:55 AM
I hope this helps . I am Getting below Error in Auth.d.ts file in Node_Modules Package. , Try changing it to:
import { Observable } from 'rxjs';
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