Utilizing the async pipe with an RxJS interval on a component that is dynamically generated: A step-by

Question

Utilizing the async pipe with an RxJS interval on a component that is dynamically generated: A step-by

Is it possible to use the async pipe with RxJS interval() on dynamically created components, as shown in this example? When applying the async pipe inside the component, the interval is often ignored when components change.

For instance, if I want to retrieve data every 15 minutes but the components are changing every 15 seconds.

The only solution I've come across is to take data from one Observable and save it to another, but I'm not sure if this is the best practice. Is there a better way to achieve this?

The structure of the Observable is:

interval(1000 * 60 * 15).pipe(startWith(0), switchMap(() => this.http.get('someUrl')));

Solution that has worked for me:

interval(1000 * 60 * 15).pipe(startWith(0), switchMap(() => this.http.get('someUrl'))).subscribe((data) => {
  this.someUrlData = scheduled([data], asapScheduler);
});

angular typescript

Answer 1

Answer №1

Your proposed solution seems effective and acceptable, but it may be confusing for new developers without sufficient comments. In order to prevent potential misunderstandings or risky refactoring attempts, I would recommend a more clear and readable approach:

getData = new Subject<void>();

// UI Observable (used with async pipe)
someData$ = this.getData.pipe(
    switchMap(() => this.http.get('someUrl')),
    shareReplay(1)
)

// Subscriptions (in ngOnInit)
timer(0, 1000 * 60 * 15).subscribe(() => this.getData.next())

This approach offers better readability and provides control over data retrieval operations. Additionally, you can easily incorporate a "refresh" button by triggering the getData subject.

Remember to properly unsubscribe from the timer subscription to avoid memory leaks.

Update:

In response to your initial query, it is indeed considered a best practice to transfer values between Observables. To ensure continuity even when the component is destroyed, it is recommended to encapsulate such functionality within a service.

Answer 2

Your proposed solution seems effective and acceptable, but it may be confusing for new developers without sufficient comments. In order to prevent potential misunderstandings or risky refactoring attempts, I would recommend a more clear and readable approach:

getData = new Subject<void>();

// UI Observable (used with async pipe)
someData$ = this.getData.pipe(
    switchMap(() => this.http.get('someUrl')),
    shareReplay(1)
)

// Subscriptions (in ngOnInit)
timer(0, 1000 * 60 * 15).subscribe(() => this.getData.next())

This approach offers better readability and provides control over data retrieval operations. Additionally, you can easily incorporate a "refresh" button by triggering the getData subject.

Remember to properly unsubscribe from the timer subscription to avoid memory leaks.

Update:

In response to your initial query, it is indeed considered a best practice to transfer values between Observables. To ensure continuity even when the component is destroyed, it is recommended to encapsulate such functionality within a service.

Answer 3

Answer №2

In my opinion, the solution you discovered is the most effective way to achieve your goal. By establishing a shared state with the interval time and checking it when creating the dynamic component, you can make the necessary HTTP call. It seems essential to have an outer state that can be monitored since the interval needs to be destroyed each time a new component is created.

Answer 4

In my opinion, the solution you discovered is the most effective way to achieve your goal. By establishing a shared state with the interval time and checking it when creating the dynamic component, you can make the necessary HTTP call. It seems essential to have an outer state that can be monitored since the interval needs to be destroyed each time a new component is created.

Utilizing the async pipe with an RxJS interval on a component that is dynamically generated: A step-by

Answer №1

Answer №2

Similar questions

You must include the formControlName within a parent formGroup directive

What sets apart the commands npm install --force and npm install --legacy-peer-deps from each other?

Is it possible to multitask within a structural directive by performing two actions simultaneously?

Whoops! Looks like there was a hiccup with the Vercel Deployment Edge Function, causing an

Angular sets the required property only when the button is clicked

Ionic 2 faced an unresolved core-js dependency issue

Encountering a Vueify Typescript error in a Vue project

Ways to solve VScode gutter indicator glitches after switching text editors?

Efficient method for binding a select element when loading options is time-consuming

Setting default values in Angular dropdown select using TypeScript

How to extract a single value from ngFor in Angular 2

Tips for presenting SVG symbols using Interpolation within Angular 7 from a JSON document

Unable to locate a type definition file for module 'vue-xxx'

Switch from using getElementById to useRef in React components

Encountering the error message "TypeError: Unable to access properties of null (reading 'get')" while utilizing useSearchParams within a Storybook file

Struggling to compile TypeScript code

Adding a dynamic CSS stylesheet at runtime with the power of Angular and Ionic 2

What is the way to assign a variable to ngClass in Angular?

Implementing a ReactJS component with a TypeScript interface for displaying an Alert box message using Material

Avoiding the occurrence of routing errors when an error arises in Angular 2