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Questions tagged [rxjs-observables]

759 questions
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Angular Navbar change when Logged in

I have a navbar in my App component: app.component.html
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Unsubscribe later with takeUntil if a condition is met

I want to unsubscribe to an observable with takeUntil in any case where the number does not equal 5. If the number is 5 want to do something and unsubscribe later, but it does not work. This is my stackblitz link:…
nfianfnuae
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ngbTypeahead search results missing

I am currently writing an ngbTypeahead search and I am stuck because I have never really worked with Observables, which are the expected return type of the ngbTypeahead search. The search function in my component looks like this: search:…
BoJack Horseman
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Can you return an array of objects, with each object containing an observable from forkJoin?

let fruit = { id: 1, isGood: false } lets say I have a function call that accepts an id of a fruit object and returns an observable that resolves into a boolean indicating whether the value isGood is true or false. I want to map through an…
Trevor Lane
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Check if object in array of objects exists against user input in RxJS HTTP Request

Using Data/Action Streams via RxJS, I want to return/pass an error if a user inputs an invalid bay number. My code currently will return a bay object if it matches the number that the user inputs, BUT I can't figure out how to throw an error if the…
Donny groezinger
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Transform data from one observable using another observable in angular rxjs

I have two observables: cities and addresses. In my addresses array I have an object with a property city_code which has a value and a property city which is empty. In cities I have objects with both properties. How can I transform the data in…
Mr.Milannist
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RxJS. Combine observables that emit less then 1 second apart

There are two observables that may be emiting together or separately: stream1 and stream2. I need my subscription to fire only if stream2 fires less then 1 second after stream1 does. Any way to achieve that with RxJS?
Yan Sidorov
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Detecting change of a BehaviorSubject component member variable updated in a subscribe block?

I have an element in a component view:
Progress: {{ progress$ | async }}
It is supposed to be updated in a continuous way by a next() call in a subscribe() block: progress$: BehaviorSubject = new…
Stephane
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How to use rxjs for multiple inner nested subscribes

In the below code I have used subscribe inside subscribe. This code works but the code structure is very bad. I would like to refactor this code using rxjs(forkjoin or mergemap).I'm not sure how to achieve this. Can someone help me with this? Any…
mohammed fahimullah
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RXJS modify order of subscribers

Is it possible to ensure that a subscriber is the last to be executed in the observer queue? A delay(0) is no option for me since I need the code to be executed in line and not asynchrounus. let observable = new Subject(); //delay(0) no…
tris
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change the agm-circle color

I want to change the agm-circle color when the map changes its mode to dark mode. I have a behavior subject as follows in the service file private isDarkModeActiveSubject = new BehaviorSubject(false); readonly isDarkModeActive$ =…
sunil
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Angular BehaviorSubject has delayed update to front-end

I am having issues with a front-end component not rendering updates to a BehaviorSubject and I'm hoping someone can point out where my error is coming from. I have read many other questions about BehaviorSubject issues, but so far I cant get a…
urbancomputing207
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How To Limit Concurrent API Requests In Angular Using RxJs

I have an Angular 7 application that allows you to multi-upload files. For each file chosen, it makes a request to the server. This isn't great because opening hundreds of concurrent calls seems like a potential problem for my backend servers. What…
Isaiah Fasoldt
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Share a subscription if observable not done

I have an angular application that should sync some data with the server on some conditions (some triggers in software or when user request). So i have a function like this: ... public createSyncObservable(): Observable { …
DSLima90
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Stop RxJS HTTP Polling after HTTP success response

I have following code that mimics HTTP Requests polling. timeout:Observable = timer(10000); startPollingStackblitz(arnId: string) { const poll:Observable = of({}).pipe( mergeMap(_ => { …
Michael Z
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