Questions tagged [rxjs-observables]
759 questions
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Angular - add and remove entries from an observable
Consider a table component, which holds the variable rows = Employees[]. The rows are set by a service, which I am currently trying to implement. The challenge that I am facing is that I want to be able to both add and remove rows to my table…
Luk
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1 answer
Failed to load resource rxjs
I just upgraded to rxjs 5.4.3 and now I am getting a error in the browser. In my package.json I have "rxjs": "5.4.3" installed so I am not sure why I am getting this error message?
ts file:
import { Injectable } from "@angular/core";
import {…
Jefferson
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Property 'lift' in type 'Subject' is not assignable to the same property in base type 'Observable'
I am getting this error about property lift in the Subject.d.ts file and not sure how to correct it. I am using RxJS version 5.0.1.
Error TS2416 (TS) Property 'lift' in type 'Subject' is not assignable to the same property in base type…
Jefferson
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1 answer
RxJS subcribe is deprecated
I have trouble with subcribe method. In vscode it says that subcribe is deprecated but I have no clue how to change it properly.
public getAccount(): void{
this.accountService.getAccounts().subscribe(
(response: Account[]) => {
…
Aitsuken
- 126
- 10
1
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1 answer
rxjs retryWhen promise is resolved
I'm implementing an Angular service which calls a server for data. In every call I need to pass a token which lasts about a minute and then I need to map the response to get an specific field. So if my main call fails I need to call again for a…
Álvaro Fernández
- 120
- 7
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1 answer
Custom hook to subscribe to array of observables and take the latest value from each
I have an array of Observables streams$ which each emit a value once, when the associated async operation completes. I want to aggregate the results in an array arr, where arr[i] = undefined if streams$[i] hasn't completed, and the resolved value of…
user6118986
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Observable in hook dependency array causing infinite loop
I have a custom hook which receives an array of Observables as a parameter, then (in a useEffect hook) sets internal state any time the Observable emits a value.
export const myHook = (obs$: Observable) => {
const [state, setState] =…
user6118986
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2 answers
How get initial value from an Observable Angular 8+
I have a page form with values already setted, previous and next button elements.
At ngOnInit, I'm getting a List with 3 items from an observable, as initial value - sometimes I get 4 items.
Before I go to the next page I have to click, necessarily,…
Daniel Portilho
- 11
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1 answer
Multiple subscriptions causing source stream to fire twice
I want to use RxJS to listen to clicks, perform a transaction, and keep track of the transaction status:
function performTransaction() {
const status = {
'0': 'pending',
'1': 'success'
}
return interval(1000).pipe(take(2), map((i) =>…
sennett
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expected behavior of immutability in rxjs observables
I've been troubleshooting a pretty nasty bug where I've eventually realized that it was caused by mutation of a nested object that was passed down the stream of observables and it really surprised me since I was thinking that Observables and their…
gil
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How to load data from remote URI with nestjs/axios properly using Observables in the correct way?
NestJs suggests to use the HttpModule imported from @nestjs/axios to perform requests to external APIs. I understand that the HttpService transforms the responses into Observables. However, it makes it hard to fetch data inside of my service that…
itinance
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async template bind from subscribe angular 13
I'm trying to bind data on subscribe on ngOninit, here is the page profile.component.ts below.
export class ProfileComponent implements OnInit {
public userDetailsArr: UserDetails[] = [];
private subscriptions: Subscription[] = [];
async…
namco
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1 answer
Rxjs using previous observable from early stage of the chain
How do I use an observable from early stage of the chain (not the last one).
I have code like this:
deleteGroceryStoreAndItsOwner() {
this.groceryStoreOwnerService.getGroceryStoreOwnerSummaries(this.city.uuid)
…
STH
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combineLatest with arrays of observables
How would one go about using combineLatest with two or more arrays of observables?
const array1 = [of(1), of(2)];
const array2 = [of(3), of(4)];
combineLatest(array1, array2)
.subscribe(([array1, array2]) => {
console.log(
`array1[0]:…
Paul
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1 answer
RxJs mergeAll(), scan() coninutes to accumulate
I have this bit of code that is intended to accumulate features as they are added ot the features$$ observable.
private features$$: BehaviorSubject>> = new BehaviorSubject<
Observable>
…
Brandon
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