angular - How to wait for 2 Actions in @ngrx/effects

Angular - How to wait for 2 Actions in @ngrx/effects

To wait for two actions in @ngrx/effects in Angular, you can use the concatMap or switchMap operator along with the ofType operator from @ngrx/effects to filter and combine actions. Here's an example using concatMap:

import { Injectable } from '@angular/core'; import { Actions, ofType, createEffect } from '@ngrx/effects'; import { of } from 'rxjs'; import { concatMap, map } from 'rxjs/operators'; import * as yourActions from 'path-to-your-actions'; @Injectable() export class YourEffects { // Effect to wait for the first action firstAction$ = createEffect(() => this.actions$.pipe( ofType(yourActions.firstAction), concatMap(action1 => // Inside the concatMap, wait for the second action this.actions$.pipe( ofType(yourActions.secondAction), map(action2 => { // Do something with both actions return yourActions.someCombinedAction({ action1, action2 }); }) ) ) ) ); constructor(private actions$: Actions) {} }

In this example:

  1. The firstAction$ effect listens for the first action (yourActions.firstAction) using ofType.

  2. Inside the concatMap operator, the effect then waits for the second action (yourActions.secondAction) using another ofType filter.

  3. When both actions are received, the map operator is used to create a new action (yourActions.someCombinedAction) that represents the combination of the two actions.

You can adjust this structure based on your specific use case and actions. If you want to use switchMap instead, replace concatMap with switchMap. The choice between concatMap and switchMap depends on whether you want to process multiple sequences of actions or only the latest one.

Examples

  1. "Angular @ngrx/effects wait for multiple actions"

    • Code Implementation:
      import { ofType, Actions } from '@ngrx/effects'; import { mergeMap, filter } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1, action2), mergeMap(() => { // Your logic here return yourObservable; }) );

  2. "Wait for multiple actions in NgRx effects"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { mergeMap, withLatestFrom } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), withLatestFrom(this.actions$.pipe(ofType(action2))), mergeMap(([action1, action2]) => { // Your logic here return yourObservable; }) );

  3. "Angular NgRx/effects combine multiple actions"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { mergeMap, switchMap } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), switchMap(() => this.actions$.pipe(ofType(action2))), mergeMap(() => { // Your logic here return yourObservable; }) );

  4. "NgRx/effects wait for two consecutive actions"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { concatMap } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), concatMap(() => this.actions$.pipe(ofType(action2))), concatMap(() => { // Your logic here return yourObservable; }) );

  5. "How to handle multiple actions in NgRx effects"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { concatMap, withLatestFrom } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), concatMap(() => this.actions$.pipe(ofType(action2))), withLatestFrom(this.store.pipe(select(selectFeature))), concatMap(([action, state]) => { // Your logic here return yourObservable; }) );

  6. "NgRx/effects wait for specific actions sequence"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { mergeMap, filter, take } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), mergeMap(() => this.actions$.pipe(ofType(action2), take(1))), mergeMap(() => { // Your logic here return yourObservable; }) );

  7. "Angular NgRx/effects wait for multiple actions completion"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { concatMap, mergeMap } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), concatMap(() => this.actions$.pipe(ofType(action2))), mergeMap(() => { // Your logic here return yourObservable; }) );

  8. "CombineLatest in NgRx/effects for multiple actions"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { combineLatest } from 'rxjs'; import { withLatestFrom, mergeMap } from 'rxjs/operators'; // Inside your effect class combineActions$ = combineLatest([ this.actions$.pipe(ofType(action1)), this.actions$.pipe(ofType(action2)), ]).pipe( withLatestFrom(this.store.pipe(select(selectFeature))), mergeMap(([actions, state]) => { // Your logic here return yourObservable; }) );

  9. "Angular NgRx/effects wait for two actions success"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { mergeMap, withLatestFrom } from 'rxjs/operators'; // Inside your effect class combineActions$ = this.actions$.pipe( ofType(action1), withLatestFrom(this.actions$.pipe(ofType(action2))), mergeMap(([action1, action2]) => { // Your logic here return yourObservable; }) );

  10. "RxJS combineLatest for NgRx effects with multiple actions"

    • Code Implementation:
      import { Actions, ofType } from '@ngrx/effects'; import { combineLatest } from 'rxjs'; import { mergeMap, withLatestFrom } from 'rxjs/operators'; // Inside your effect class combineActions$ = combineLatest([ this.actions$.pipe(ofType(action1)), this.actions$.pipe(ofType(action2)), ]).pipe( withLatestFrom(this.store.pipe(select(selectFeature))), mergeMap(([actions, state]) => { // Your logic here return yourObservable; }) );

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