Questions tagged [rxjs-observables]
759 questions
2
votes
4 answers
Service without observables
I am struggling to understand , why i need to use observable.
I have a very simple store like below
@Injectable({
providedIn: 'root'
})
export class DataService {
private readonly personData: Person = new Person();
constructor() {
}
…
ishahrier
- 93
- 1
- 10
2
votes
1 answer
Execute function after subscribers to an RxJS observable complete
In RxJS I need to execute some code after all subscriptions for a given observable have been executed. I need to do this after every single next notification that fires and after all subscriber functions have completed (not only once when the…
Sirion
- 804
- 1
- 11
- 33
2
votes
1 answer
Mapping an Observable in array items of another Observable, flattening the result
This title probably needs more explanation.
Basically what I get from the backend is an Observable with an array of racedrivers, and to each of the array items, I want to map another property isOnTrack, which consists of another Observable (simple…
Peter ten Klooster
- 80
- 5
2
votes
1 answer
RxJS unsubscribe hook
Having a piece of code that fetches some data to a cache, and keeps it in sync using a websocket connection, and provides an access interface to the data using an Observable, how can I know that there are no subscribers to said data at one point in…
Ákos Vandra-Meyer
- 1,890
- 1
- 23
- 40
2
votes
2 answers
Angular RxJs Observable stream merge data
I'm trying to refactor my Angular code to be more "reactive"
I have data returned from an Observable which retreives account data account$ into an object
for example:
{
accountid: "123435",
name: 'bob',
customerId: "AR4533"
..etc}
I also…
diyko
- 23
- 4
2
votes
2 answers
Angular template binding with Observable async pipe issue
Note I have created a simplified version of this question at Template binding with function return Observable and async pipe
Template:
…
Gelin Luo
- 14,035
- 27
- 86
- 139
2
votes
1 answer
Setting selected item of a select element using async pipes in Angular
Angular experts! I'm trying to understand async pipes in Angular, but I'm stuck in a basic scenario. I have two select elements in the UI, one containing posts and one containing related comments. I want to set a posting (the last one) as the…
Frank Jusnes
- 175
- 1
- 13
2
votes
1 answer
Angular + Ngrx : best practice to select a value in component and in function
I have pretty much the same question as in ngrx get value in function , but I'm wondering if the answer (see comment in that topic) is still the best practice nowadays.
My situation is:
I want to get 2 values from the store to show in my component…
bits
- 672
- 2
- 7
- 26
2
votes
2 answers
Wait for two observables (incl. failed one) before rendering template
I have two Observables. The rendering of the template should only start when BOTH Observables are completed or failed:
Observable 1 completes and Observable 2 completes or
Observable 1 completes, but Observable 2 fails
When Observable 1 fails…
Jean D.
- 169
- 3
- 15
2
votes
2 answers
How to finilize rxjs switchmap observable?
I have an observable in my angular 8 project, and subscribing in ngOnInit().
export class ChartComponent implements OnInit {
urlSubject: Subject = new Subject();
isLoading: BehaviorSubject = new…
barteloma
- 6,403
- 14
- 79
- 173
2
votes
2 answers
How do i use rxjs to ignore second,third button click till my first button click process is complete
My HTML has the following code:
button (click)="doFunc()"
In my ts-file I have the following:
doFunc(){
this.service.executeAFuncWhichIsAsynchronous().subscribe(x => { updateMyUi(); });
}
When I click the button twice, two service calls are…
angular_noobie
- 31
- 2
2
votes
1 answer
Wait for data of a component to load before rendering the next component - Angular
I have to render a chain of components(say grids in blades) wherein after first component's data is loaded I will click on the data row of that component and it will open the next component. On click of data row of the next component, it will open…
Ora
- 1,889
- 2
- 9
- 9
2
votes
1 answer
Unsubscribe from observable timers that emit only once necessary?
In my program, I have a few timer(1000).subscribe() instances as well as some timer(1000, 1000).subscribe() parts.
I was experiencing some memory leak issues and was wondering if I could alleviate those by unsubscribing from timers. Unsubscribing…
mneumann
- 713
- 2
- 9
- 42
2
votes
1 answer
How to get last value of observable by key using debounceTime
employeeChanged: Subject = new Subject();
setInterval(() => {
this.employeeChanged.next(1);
this.employeeChanged.next(1);
this.employeeChanged.next(2);
this.employeeChanged.next(2);
this.employeeChanged.next(3);
…
pr0metheus
- 488
- 6
- 14
2
votes
1 answer
Angular 8 upgrade - typescript error - Type 'Observable>' is not assignable to type 'Observable'
I had a perfectly running code (and still running perfectly). When I upgraded from angular 7 to angular 8, my visual studio code started showing errors for HttpClient.get methods.
The errors are coming in the catch part of the HttpClient.get…
Dhaval Chokshi
- 113
- 1
- 9