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Why does ', providers: [TravelService] ' in a component prevent the RXJS Behaviour subject from sharing data across comp

By : Hana Smrčková
Date : September 16 2020, 11:00 PM
it fixes the issue Your first version prevents the data sharing because you're providing a new instance of the TravelService for your component and its child components. So every OverviewTravel component has its own instance of the TravelService, which cannot be accessed by other components.
For more details see the docs.
code :

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Can't pass data between component using RxJS Subject/Shared Service

By : Jonathan Orozco
Date : March 29 2020, 07:55 AM
Does that help I think that happens because you are subscribing to the Subject in your ListComponent after you emitted a value using next(). Use a BehaviorSubject instead. When subscribing to a BehaviorSubject it emits its last value. Because of that it also needs to have an initial value:
code :
let bSubject = new BehaviorSubject(null);


 .filter(value => value !== null) // filter out the initial null value to avoid problems if you did not emit anything before subscribing
 .subscribe((value) => {
  console.log(value); // logs your album

how to shared object data between two component using service(rxjs subject )

By : yupyupp
Date : March 29 2020, 07:55 AM
may help you . Please give me a solution for that question. I want to pass a custom object using service. , You can create a subject inside your service
code :
messageSource: Subject<string>;
this.messageSource = new Subject<string>();
this.yourService.messageSource.asObservable().subscribe((value: string) => {


RXJS subject and behaviour subject

By : user1938361
Date : March 29 2020, 07:55 AM
I hope this helps . You can try below one as we are having almost same implementation as you have :
code :
private requests: Request[];
private observableRequests: BehaviorSubject<Request[]>;  

constructor() {
  this.requests = new Array<Request>;  
  this.observableRequests = <BehaviorSubject<Request[]>>new BehaviorSubject([]);

get requests() {
  return this.observableRequests.asObservable();

addRequest(request: Request) {

I am unable to access condition set up in component-1 by Subject of rxjs in component-2

By : user3393862
Date : March 29 2020, 07:55 AM
it should still fix some issue Service: , You can try using
code :
public newRoleAdded = new ReplaySubject<boolean>(1);
public newRoleAdded = new BehaviorSubject<boolean>(null);
getNewRoleAddedObservable(): Observable<boolean> {
  return this.newRoleAdded.pipe(filter(value => value !=null)).asObservable();

RXJS Behaviour Subject outputting Duplicates on First load

By : Ben Bender
Date : March 29 2020, 07:55 AM
hope this fix your issue That is what BehaviorSubject is for, it first gives value that is there, and after that all next values. If you do not want first value, then change it to simply Subject.
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