All Questions
Tagged with angular observable
6,078 questions
1
vote
1
answer
52
views
Initial value not displayed on mat-select component using async pipe
I'm trying to use a material select component that gets its values through an Observable with async pipe.
template:
<mat-form-field>
<mat-select
value="selectedOption$ | async&...
- 13
1
vote
1
answer
50
views
How to refresh and listen to the refreshed data inside one stream
The important part of my code looks somewhat like this:
data$:Observable = this.dataRefresh$.pipe(switchMap(() =>
this.http.get('url')), shareReplay());
dataRefresh$:Subject = new Subject();
...
- 33
0
votes
1
answer
55
views
foo.subscribe with bar not always working
Imagine we have foo$ and bar$ and both of them are BehaviorSubjects.
I have a bug in angular that sometimes in some cases foo$.subscribe(bar$) works fine, in most casses actually.
But sometimes I have ...
1
vote
1
answer
34
views
Angular Query Tanstack Query cleanup logic
I'm using Angular 18 with TanStack Angular Query and have a question about handling observables in the queryFn.
In my queryFn, I'm using lastValueFrom() with an HTTP request like this:
queryFn: () =&...
1
vote
1
answer
21
views
Compare emitted values from the same Request
In my angular component I fetch a list of objects via http-Request and render that data in a List and set some additional configdata based on that list.
In the end I have a "proceed" button ...
2
votes
1
answer
207
views
Not able to make firstValueFrom/async work with Angular
I'm trying to create an Angular (v19) app, which basically consumes an API and uses the responses to render the app's UIs. A pretty standard scenario. The only thing more “audacious” is that I would ...
- 5,489
0
votes
1
answer
49
views
How to pass an array of pipable operators to pipe()?
[Angular 12]I have a service with a method, handleFormControlChanges, which accepts, a formControl, a destroy subject, a method and an array of pipable operators (e.g., delay), and I would like to ...
- 45
1
vote
1
answer
66
views
Input Subject is empty in child component Angular 17
I am trying to pass data from a parent to its child component in Angular 17.
The data is retrieved from the back-end through an API that gets an array of items.
In my parent component, items$ is a ...
- 182
0
votes
0
answers
54
views
Angular Tanstack Cached Observables are refreshing data and not using the cache causing problems
I'll keep it short as possible ><
-I have a left hand menu with items that can be expanded/collapsed. This is dependent on "getAll()" and works as expected.
-When I incorporated "...
- 195
1
vote
1
answer
135
views
Why using EventEmitter in angular is considered bad practice
In an angular project (v17), I've used EventEmitter to notify one component, of the changes of another, somewhat unrelated (not a parent nor grandparent, not a child nor a grandchild) component. I can'...
- 96
1
vote
1
answer
91
views
Call function after signal value change
I have a component with a simple login form.
@Component({
selector: 'app-login',
standalone: true,
imports: [
ReactiveFormsModule,
MatCardModule,
...
],
templateUrl: './login....
- 11
1
vote
3
answers
66
views
Initialize BehaviorSubject with value from Observable
I was trying to create an item counter for Wishlist Entries in my header area and tried to apply the solutions suggested here (for Cart Items)
Change shopping-cart count in header in Angular
...
0
votes
2
answers
94
views
Losing reference to this in async function inside subscribe [closed]
I'm almost new to Angular and I'm really lost with the async and sync methods, await, observables, promises...
I have a button that opens a modal window, reads a barcode and with the information of ...
- 67
2
votes
3
answers
138
views
How to modify data in an angular component when using async pipe
I have an Angular 18 component that receives an observable, which I render on the page using an async pipe. I want to be able to modify the data within this component and then press a "Save"...
- 34.3k
1
vote
0
answers
48
views
RxJs Observables and Subjects resolving async process times when browser is in focus
I'm a bit new to Angular and have forked a complex project that in a subscription to a websocket, uses Observables, Subjects and ReplaySubjects altogether to achieve a function that I summarize here:
...
- 310