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Questions tagged [rxjs-observables]

759 questions
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How to use combineLatest with flatMap in rxjs6?

I use the code with rxjs 5.5.12 in React Native, it works. In rxjs 5.5.12: // the function will return Observable rxInit() { return Observable.combineLatest( myObservable1, myObservable2, ).flatMap((result) => { …
Morton
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RxJS scan to accumulate database results using filter and offset as url parameters

I have two behaviorSubjects offset = new behaviorSubject(null) filter = new behaviorSubject(null) I do the following.. combineLatest( this.offset, // last item in the list, ID for example this.filter // can be any…
user12163165
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rxjs/angular - how to merge normalized data from service?

I am new to Angular and RXJS - I'm trying to return normalized data from a rest api and assemble the hierarchy on the client. I created this stack blitz which is a really basic version of what I'm trying to accomplish: …
user3551865
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unable to convert an Observable into a ConnectableObservable

I have a BehaviorSubject. I am trying to convert its Observable into a ConnectableObservable but I am getting error publishBehaviour is not a function. What am I doing wrong? this.questionsArray$.publishBehavior is not a function TypeError: …
Manu Chadha
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Wait for an observable's value (as a list) to call another observable using each member from the list?

I am using 3 endpoints for my application, 1 of the endpoints depends on other of the endpoint's response, which is a list, then I need to use each item of the list in order to use the other endpoint, let's call them epA, epB and epC, epA returns a…
zandMonster
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Angular Unit Test: How to cover activity inside service stub method subscriptions

I'm writing unit tests for one of my Angular component methods which assigns a property the response value from a service call and calls another method. I have my service stubbed with response data and I subscribe to it inside my test with the…
Steve Whitmore
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Observable Is not binding Angular 6

I have been working on another question here and the helper has gone a little quiet and I need to get a solution on this pretty quickly. See Here For More Information I have implemented the new code and find that the array is returning 'false' to…
Apex
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Angular 7 Transform Observable response to a new observable object

I have an api which responses like this and I am using rxjs observables [{ "error": "error_1", "types": [ { "type": "new_type" }, { "type": "old_type" } ], "date": "2019-08-29" }] I need to transform it…
vashlor
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sending get with attached observable with angular and ionic framework

I have spent hours trying different ways to get this Observable to work in ionic / angular. I have tried different setups and interfaces to plugin to Observable which has properties which are strings. I have tried plugging in JSON as an interface. I…
sasy solutions
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wrapper observable event on top of http call

I have a function which returns an object. Instead of returning the object synchronously, can I have it returned inside an observable which can be later resolved using callbacks (similar to an http call). Caller Function: getResource() { …
Rk R Bairi
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How to convert sequentially emitted data to a single array

So, I am using ngrx store for getting data. Once I select the property I want from the store, after then I subscribed it to get observable stream. My data contains array of object. So in this array of objects, I have to do some modifications in some…
vinay yadav
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Awaiting for two methods that return observables in angular

I have two methods that make api calls and return observables. private method1(): Observable { return homeService.call.get(); } private method2(): Observable { return userService.call.get(); } Then I have the following two…
heisenberg
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Probably race conditions

Hi guys I try to solve one bug. After click on button is timeinput sometimes empty. When I use delay() all is ok. But without I have empty input when I create new visitor. export const visitListStartFetchAfterChange: Epic = (action$, store) => …
Michal Vrabec
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How to, in 1 function, perform operations on 2 separate data collections in 1 function in RxJS?

How to perform operations on 2 separate data collections in 1 function in RxJS so that it returns observable -> as for now it returns Void ? This function is running inside Service of course, and finally I want to subscribe to it in my component. I…
Piotr Deja
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Angular RXJS optimize nested subscribes

Hey there I've an update function call with nested subscribe, interdependent, just that on the success of the parent call subscribe the inner one updateSelectedScopes() { let params: any = { userInterface: this.userInterface, targetId:…
Mitul Panchal
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