Questions tagged [rxjs-observables]
759 questions
1
vote
2 answers
Subscribe to all control values within an dynamic array of controls
I have a dynamic array of ng-select controls. Each control represented by class NgSelectComponent.
When select value changes I want to subscribe to all controls.
Template
Sergino
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1
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1 answer
How to synchronise rxjs observables
I'm looking for a way to make streams that are combined
Note: this is the simplest form of my problem, in reality I'm combining 8 different streams some are intertwined, some are async etc :(
import { BehaviorSubject, map, combineLatest } from…
Jason Rogers
- 19,194
- 27
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1
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1 answer
RXJS, how to change the result of each result from an observable?
I have this reloadProducts function that i use to reload the products i have in my cart.
I have 2 models, one is CartProduct and the other a Product.
The CartProduct has a name which i use with a function from my service, to get the matching…
RasmusKW
- 45
- 3
1
vote
1 answer
How to use LOGICAL OR Operator on Observable Boolean in Angular/RxJS
I am trying to do the logical OR/AND operator on two observable Boolean values.
I looked around a little and found on some old questions that combineLatest could be used for that, but it seems unfortunately it is deprecated now, and I can't find any…
Rishabh Agrawal
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1
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2 answers
How to cancel previous http request when type in search bar
I want to add some delay in making network request when I type in search bar. So I can prevent unnecessary network request.
header.component.ts
searchProduct(event: KeyboardEvent) {
if (event) {
const { value } = event.target as…
Amar
- 11
- 2
1
vote
1 answer
Angular version 14: map() inside pipe() to obtain a sub-array
Currently i'm refactorizing a web app which consists on a website which shows the Golden State Warriors Roster and more specific info about the NBA basketball players if i click on the player's image.
I get the data located on a JSON Server/JSON…
Eric Díaz
- 15
- 4
1
vote
1 answer
return Eventsource Observable from Server sent event in angular
I have a Observable from a server sent event which returns data und errors using the following solution Allow creation of Observable from EventSource (server-sent events): enhancement
To solve connection issues I want to separate the
const…
Sator
- 636
- 4
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- 34
1
vote
1 answer
Angular async pipe doesn't subscribe
In Angular (v12) I've got the component you can see below:
component.html
Loading...
component.ts
token:…
{{ userInfo.user.name }}
Igor Cantele
- 387
- 1
- 10
1
vote
1 answer
How do I test an observable inside mergeMap when outer observable uses FileReader
I'm trying to test a file upload. I wrapped the FileReader() into an observable according to this thread:
onFileSelected(event: any) {
this.importJsonFileToString(event.target.files[0])
.pipe(
map(jsonString =>…
Waffel
- 11
- 3
1
vote
1 answer
How can I combine 2 observable that return success result event if one of them was failed?
I want to subscribe to two observables methods but one might get an error and the second may success.
But when I try to do it I get only error event if one of them return success
when I'm using combineLatest I get only error even if the first is…
Ortal Blumenfeld Lagziel
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1
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1 answer
Why these RxJS operators are not running in my function?
I wrote a function to check if a div should be displayed, like this :
shouldShowDiscount() {
console.log('shouldShowDiscount');
return this.baseSiteService.getActive().pipe(
switchMap(
(bucode, index) => {
…
João Pedro
- 794
- 2
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- 28
1
vote
0 answers
Angular: rxjs observables: Code in subscribe function not executed
I'm subscribing to an observable my service returns. The request to the backend works and I get a response. But the code inside the subscribe function is ignored.
I get the observable from the service like this:
my function() {
return…
sgart
- 76
- 6
1
vote
0 answers
In RxJs, what are the examples of Hot and Cold Observable operators?
Is there a list to differentiate them?
I have tried using some of them and was thinking if there is a list for me to check whether I am using the Hot or Cold Observable operator.
Eli
- 9
- 3
1
vote
0 answers
How to chain serial operations with observables using the rxjs concatMap operator
I am trying to perform a series of chained operations on a database where the starting point is a set of entities that I loop through and for each one I have to execute 3 calls to a service that accesses the database
estudiarConcursos()…
kintela
- 1,283
- 1
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1
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1 answer
Join multiple http calls that can happen conditionally in one observable
For the sake of the example lets say I have a entity called client:
interface Client {
id: number
name: string
address: Address[]
}
interface Address {
id: number
street: string
}
In this case I cannot update the name of client and…
Thomaz Aquino
- 23
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