Questions tagged [rxjs-observables]
759 questions
0
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1 answer
Observable pipes
I have a question about the pipes of the observables
suppose I have the following code:
const skip$ = of(4);
const length$ = of(24);
const schoolId$ = of(1);
const source = combineLatest(skip$, length$, schoolId$).pipe(
map(([skip, length]) =>…
Jordi Baliellas Portet
- 221
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1 answer
Angular observable, how to iterate through an object with nested array to collect fields into an array
I am trying to go through my JSON object and add specific fields to their own array.
I am trying to iterate through the below object and store the 'appSupportedId' in its own array.
I am getting an ERROR
ERROR
core.js:15714 ERROR TypeError:…
Rob DePietro
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1 answer
Angular routerLink only triggers ngOnInit once
I have found several questions similar to mine, but the big part are related to params, the answers didn't help me to solve my issue. Basically the problem is the following:
Once the user logs in, the user is able to visualize his/her username in…
HeyBaldur
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3 answers
Observable to Array *ngFor saying undefined
I am new to Angular. I have a Node and Express backend pulling data from an MS SQL database. If I go to the endpoint URL it displays my data as JSON. I am running on localhost so I set a proxy for CORS. I have a class that defines the data, a…
user41814
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- 6
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Angular 6 / 7 / 8 ngbtypeahead returns matching and non matching records both
I am taking records from REST API and showing it in input type as a type-ahead feature, where I have to enter at least 3 letters before giving an API call.
This is my HTML code
Chetan Birajdar
- 461
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How to map values from JSON-file or REST-response in Angular with service into properties of two (or more) typescript-objects?
Although I feel this answer is relatively close to my problem and got some reputation, I don't get it right. I read a lot of posts on how to use the "new" style of Observer-pattern ((...).pipe(map(...)).subscribe(...) and *ngFor="... | async") in…
Jochen Haßfurter
- 875
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RXJS: How to get connect event? retrywhen: how to hook into execution?
When Angular tries to connect, I want to show "Connecting". I can do it on first connect, but I don't know how to do it when using retryWhen(). I need to hook into the actual execution and then do:
this.connectionStatus = "Connecting"
Current…
NoobieNoob
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2 answers
Angular 8 - keeping track of displayed components without access to URL params
I have two main components - list and detail. In the third component, which doesn't have a parent/child relationship with either of the first two components, I need to know which component is currently being used/displayed and based on that, perform…
Mandy
- 107
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- 2
- 9
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RXJS sequential HTTP request
I would like to do sequential HTTP calls and merge the responses into one and unique observable.
Problem is: the way I am doing it seems to be wrong. Indeed, I would like to merge the data from the second request into the first one, but the way I…
Synops
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2 answers
Passing and unwrapping Observable as Subject
I need to pass data from one component to another but I'm having a hard time doing so.
I have an Observable that I need to pass as Subject which is another Observable. How do I do that?
The way I currently have is not working as it gets in the…
MrRobot
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Angular 8 RXJS6 Observable pre-process response before return
I have an observable that makes an API call. The API call returns an array of objects in the response.
I am using this observable in multiple places. In most cases, I want the object in the response.
However, in the case of CanDeactivate, I need to…
pengz
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1 answer
Angular8 RXJS CanDeactivate wait for result of observable before deactivation
I am attempting to use a CanDeactivate guard to detect when a user navigates away from the component. The purpose is to #1 check if the current user owns the 'Is Being Edited' lock on the record, and #2 if so, call an observable to update the…
pengz
- 2,279
- 3
- 48
- 91
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distinctUntilChanged under Race observable not working as expected
We want to buffer the data until the below two events are reached such as the debounce time reached to 5 or value is changed. But based on the below test we seeing it is not working properly.
The behavior I want to achieve is.
a) When there is a…
user1595858
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2 answers
Combining observables in series & parallel to fetch data from multiple APIs
I am trying to check the validity of a function I have written in Typescript, in congruence with RxJS observables, that fetches some bookings from one service and then for each booking fetches its corresponding location and activity from another…
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How to subscribe multiple observable in rxjs 6 ? do is not a function in rxjs 6
In rxjs 5.5.12, I created a login() to subscribe with multiple observable by do()
login(userEmail, userPassword).subscribe((response) => {
console.log(response);
if (response === 'something') {
// some actions
} else {
// some…
Morton
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