Questions tagged [rxjs-observables]
759 questions
0
votes
1 answer
Angular/RxJS update piped subject manually (even if no data changed), "unit conversion in rxjs pipe"
I am working on an app using Angular 9 and RxJS 6.5. The functionality I have problems with uses Angular services to fetch some data from a server and provides this data to views (using RxJS behaviorSubjects). Before passing that data to the views…
Janis Jansen
- 996
- 1
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0
votes
2 answers
Why is my RXJS epic in an infinite loop on mount but only called once on button click?
please take a look at this code below
basically what is happening my action is being dispatched here:
useEffect(() => {
fetchData()
setLoaded(true)
}, [])
but for some reason this is infinite looping and causing my action to…
Red Baron
- 7,181
- 10
- 39
- 86
0
votes
0 answers
" observable$ | async " failing with HttpClient observables, but succeeding with for operator
I followed a tutorial about dynamic forms (https://angular.io/guide/dynamic-form) and everything worked just fine untill I tried to retrieve the data from an HttpClient.
The problem: @Input() questions: QuestionBase[] = [];in…
Letizia Brunetti
- 53
- 5
0
votes
1 answer
Combine two observables inside pipe() chain
I'm using Rxjs, and I want to create an Observable from the following pattern (in order):
get params from paramMap$, then ...
based on the value of params, get both (getData():Observable, getCategories():Observables) together, then ....
from…
Sh eldeeb
- 1,589
- 3
- 18
- 41
0
votes
1 answer
AngularFireFunctions httpCallable not updating after response
Using an Observable from AngularFireFunctions' httpsCallable, the view never updates with the value even after the http request returns.
I have a simple component that uses AngularFireFunctions to make an httpCallable to a simple function. I can see…
Keith
- 2,958
- 4
- 26
- 29
0
votes
1 answer
Implementing permission directive won't update view until page refresh
I have created a directive to show/hide element according to permission.
Implementation of directive is somehow like:
Directive code is:
import {
Directive,
…
NItesh Shrestha
- 66
- 3
- 12
0
votes
0 answers
How to implement reactive programming in angular with Observable store state management?
I am using @CodeWithDan/Observable store package for state management. However while started to play with it, there was no help on how to have a reactive programming using the observable stores. Is there any help links out there to get an idea on…
user12354121
- 11
- 1
0
votes
1 answer
Angular: are nested async pipe usage safe?
I couldn't find any documentation related to this, so here it is. I have this usage of async pipe in a template:
petronius
- 451
- 3
- 11
0
votes
3 answers
Angular route guard/resolver - Type 'Observable' is not assignable to type 'Observable'
I am using a route guard (or resolver, I have tried to use either but got the same error) where I want to get Observable as a return value:
canActivate(): Observable {
return this.store.pipe(
…
Efron A.
- 353
- 3
- 10
- 19
0
votes
1 answer
What is the best practice to share data in map/object/array by service among Angular components
I am studying angular now. When it comes to data sharing using service, many are recommending that we should use Subject like BehaviorSubject.
But should we do it all the time?
@Injectable({
providedIn: 'root'
})
export class DataService {
…
Leo Y
- 23
- 4
0
votes
1 answer
Confusion using Observable.switch
The switch documentation on github contains an example on how to use the command.
var source = Rx.Observable.range(0, 3)
.select(function (x) { return Rx.Observable.range(x, 3); })
.switch();
var subscription = source.subscribe(
function (x) {
…
user35934
- 374
- 2
- 13
0
votes
1 answer
Display data based on routing on the first component from the second component
I have 2 components on my app: filters-component and card-component.
On the filters-component I added a routing method for data filtering based on country selector anchor.
Filters-component:
import { Component, OnInit } from…
TudorPopescu
- 79
- 9
0
votes
2 answers
Is it necessary to subscribe and remove observables it in these cases?
I'm here thinking about observables ..
And I imagined the following situations:
Example 1)
In my case when I use NGRX I create all the architecture correctly, and I create a selector service for that particular store.
In the service it is not…
user11472365
0
votes
1 answer
How to complete combineLatest?
I use combineLatest to get latest values from each observables:
combineLatest$ = combineLatest(_block$, _field$);
combineLatest$.subscribe(() => {
console.log("Completed...");
});
Then I have another observable that works until…
user13295902
0
votes
1 answer
Bulk data call using RXJS in nodejs
I want to send a bulk of data and after completing it, want to move to the next one. For example:
I have this function:
async function test() {
await sample.sampleStructure()
await sample.sampleDataAdd()
await sample.sampleDataGet()
}
Where…
lazysnoozer
- 85
- 11