Ways to address errors in Angular with the assistance of a snackbar

Question

Ways to address errors in Angular with the assistance of a snackbar

I've been assigned the task of adding error handling to this code, but I'm unsure of the best approach. Any suggestions or help would be greatly appreciated.

My main goal is to display a "Error has occurred" snack bar in case the data fails to save due to network issues or other reasons.

import {Store} from '@ngrx/store';

saveClick(){
  this.store.dispatch(updateChart({chart: this.chart}))
}

angular typescript error-handling angular-material ngrx

Answer 1

Answer №1

One approach could be to trigger your snackbar within your effect when making the api call.

Upon receiving the response from your api call, you can either dispatch a success action or an error action (or directly trigger your snackbar).

Referencing the documentation, your effect implementation may resemble the following:

export class MovieEffects {
 
  loadMovies$ = createEffect(() => this.actions$.pipe(
    ofType('[Movies Page] Load Movies'),
    mergeMap(() => this.moviesService.getAll()
      .pipe(
        map(movies => ({ type: '[Movies API] Movies Loaded Success', payload: movies })),
        catchError(() => {
          /* Trigger snackbar here or dispatch an error action */
          this._snackBar.open('Snackbar message');
        })
      ))
    )
  );
 
  constructor(
    private actions$: Actions,
    private moviesService: MoviesService,
    private _snackBar: MatSnackBar
  ) {}
}

It's important to note the usage of catchError from rxjs which handles situations where the api call does not return a valid HttpResponse (e.g., with a status code other than 2xx).

Answer 2

One approach could be to trigger your snackbar within your effect when making the api call.

Upon receiving the response from your api call, you can either dispatch a success action or an error action (or directly trigger your snackbar).

Referencing the documentation, your effect implementation may resemble the following:

export class MovieEffects {
 
  loadMovies$ = createEffect(() => this.actions$.pipe(
    ofType('[Movies Page] Load Movies'),
    mergeMap(() => this.moviesService.getAll()
      .pipe(
        map(movies => ({ type: '[Movies API] Movies Loaded Success', payload: movies })),
        catchError(() => {
          /* Trigger snackbar here or dispatch an error action */
          this._snackBar.open('Snackbar message');
        })
      ))
    )
  );
 
  constructor(
    private actions$: Actions,
    private moviesService: MoviesService,
    private _snackBar: MatSnackBar
  ) {}
}

It's important to note the usage of catchError from rxjs which handles situations where the api call does not return a valid HttpResponse (e.g., with a status code other than 2xx).

Answer 3

Answer №2

When utilizing Ngrx for data storage, it is necessary to create three actions for each asynchronous event. For example, when retrieving a profile, the actions would be GetProfile, GetProfileSuccess, and GetProfileFailed. Typically, effects are used to interact with APIs, resulting in a combination of reducers, actions, and effects for managing profile data. During an asynchronous event, either an error action is triggered or a success action is provided. Here is an example from an effects file:

  public loadProfile$: Observable<Action> = createEffect(() =>
    this.actions$.pipe(
      ofType(ProfileApiActionTypes.GetProfile),
      mergeMap(() =>
        this.profileDataService.getProfile().pipe(
          map(({data}) => getProfileSuccessAction({ data })),
          catchError((error) => of(getProfileFaildAction({ payload: error }))),
        ),
      ),
    ),
  );

Furthermore, within the same file, we handle error actions in the effect as follows:

  public profileError$: Observable<Action> = createEffect(() =>
    this.actions$.pipe(
      ofType(
        ProfileApiActionTypes.GetProfileFailed,
      ),
      tap(({ payload }) => {
        // your logic with snackbar
      },
    ),
    { dispatch: false },
  );

Answer 4

When utilizing Ngrx for data storage, it is necessary to create three actions for each asynchronous event. For example, when retrieving a profile, the actions would be GetProfile, GetProfileSuccess, and GetProfileFailed. Typically, effects are used to interact with APIs, resulting in a combination of reducers, actions, and effects for managing profile data. During an asynchronous event, either an error action is triggered or a success action is provided. Here is an example from an effects file:

  public loadProfile$: Observable<Action> = createEffect(() =>
    this.actions$.pipe(
      ofType(ProfileApiActionTypes.GetProfile),
      mergeMap(() =>
        this.profileDataService.getProfile().pipe(
          map(({data}) => getProfileSuccessAction({ data })),
          catchError((error) => of(getProfileFaildAction({ payload: error }))),
        ),
      ),
    ),
  );

Furthermore, within the same file, we handle error actions in the effect as follows:

  public profileError$: Observable<Action> = createEffect(() =>
    this.actions$.pipe(
      ofType(
        ProfileApiActionTypes.GetProfileFailed,
      ),
      tap(({ payload }) => {
        // your logic with snackbar
      },
    ),
    { dispatch: false },
  );

Answer 5

Answer №3

If you want to handle Error actions in your component and display errors as side effects, it's best practice not to do it within the Effect file to maintain cleanliness. For example, let's consider an UPDATE_ERROR action.

When encountering an error while updating data, you would typically return a new action "update_failed". In your effect file, it might look something like this:

...
catchError(error => of(new yourActions.UpdateError({ error })))

Subsequently, you can subscribe to the "UPDATE_ERROR" action. Whenever it is dispatched, you can show a snackbar to display the error message. This subscription can be implemented in your component as shown below:

 constructor(public store: Store<fromRoot.State>, private actions$: Actions) {
  this.actions$.pipe(
   ofType(yourActions.ChartActionTypes.Failure),
   tap(_ => {
    this.snackBar.open("Update failed", action, { duration: 2000,});
   }));
}

Answer 6

If you want to handle Error actions in your component and display errors as side effects, it's best practice not to do it within the Effect file to maintain cleanliness. For example, let's consider an UPDATE_ERROR action.

When encountering an error while updating data, you would typically return a new action "update_failed". In your effect file, it might look something like this:

...
catchError(error => of(new yourActions.UpdateError({ error })))

Subsequently, you can subscribe to the "UPDATE_ERROR" action. Whenever it is dispatched, you can show a snackbar to display the error message. This subscription can be implemented in your component as shown below:

 constructor(public store: Store<fromRoot.State>, private actions$: Actions) {
  this.actions$.pipe(
   ofType(yourActions.ChartActionTypes.Failure),
   tap(_ => {
    this.snackBar.open("Update failed", action, { duration: 2000,});
   }));
}

Ways to address errors in Angular with the assistance of a snackbar

Answer №1

Answer №2

Answer №3

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