How to use ReplaySubject such that its observers can fire repeatedly when it subscribes to a new observable?
I am trying to figure how to use ReplaySubject such that its observers can fire repeatedly when it subscribes to a new observable (e.g. HTTP GET).
This is provider that I used:
export class CatalogService {
public borrow$: ReplaySubject<Borrow> = new ReplaySubject<Borrow>(null);
constructor(public http: HttpClient) {
}
public getBorrowView() {
this.http.get<Borrow>(apiUrl + 'Borrow/View').subscribe(this.borrow$);
}
...
}
I have two observers - one in the main component and the other in the uninstantiated child component.
The observer in the main component subscribe in the following manner:
this.catalogService.borrow$.subscribe(
borrowList => {
if (borrowList != null)
this.pages[1].badge = borrowList.length;
}
);
The observer in the uninstantiated child component subscribe in the following manner:
export class BorrowViewPage {
items$: Observable<Borrow>;
constructor(public navCtrl: NavController, public catalogService: CatalogService, public navParams: NavParams) {
this.items$ = this.catalogService.borrow$;
}
}
I want both of them to subscribe to a HTTP request and continue to respond whenever I make the function call in the main component or elsewhere: this.catalogService.getBorrowView()
However, this method only works once. It works fine on the child component. It just doesn't work after the first time for the main component. I tried unsubscribe it and subscribe it back, but it ended up firing too early yielding the wrong result.
angular typescript ionic-framework
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
add a comment |
I am trying to figure how to use ReplaySubject such that its observers can fire repeatedly when it subscribes to a new observable (e.g. HTTP GET).
This is provider that I used:
export class CatalogService {
public borrow$: ReplaySubject<Borrow> = new ReplaySubject<Borrow>(null);
constructor(public http: HttpClient) {
}
public getBorrowView() {
this.http.get<Borrow>(apiUrl + 'Borrow/View').subscribe(this.borrow$);
}
...
}
I have two observers - one in the main component and the other in the uninstantiated child component.
The observer in the main component subscribe in the following manner:
this.catalogService.borrow$.subscribe(
borrowList => {
if (borrowList != null)
this.pages[1].badge = borrowList.length;
}
);
The observer in the uninstantiated child component subscribe in the following manner:
export class BorrowViewPage {
items$: Observable<Borrow>;
constructor(public navCtrl: NavController, public catalogService: CatalogService, public navParams: NavParams) {
this.items$ = this.catalogService.borrow$;
}
}
I want both of them to subscribe to a HTTP request and continue to respond whenever I make the function call in the main component or elsewhere: this.catalogService.getBorrowView()
However, this method only works once. It works fine on the child component. It just doesn't work after the first time for the main component. I tried unsubscribe it and subscribe it back, but it ended up firing too early yielding the wrong result.
angular typescript ionic-framework
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47
add a comment |
I am trying to figure how to use ReplaySubject such that its observers can fire repeatedly when it subscribes to a new observable (e.g. HTTP GET).
This is provider that I used:
export class CatalogService {
public borrow$: ReplaySubject<Borrow> = new ReplaySubject<Borrow>(null);
constructor(public http: HttpClient) {
}
public getBorrowView() {
this.http.get<Borrow>(apiUrl + 'Borrow/View').subscribe(this.borrow$);
}
...
}
I have two observers - one in the main component and the other in the uninstantiated child component.
The observer in the main component subscribe in the following manner:
this.catalogService.borrow$.subscribe(
borrowList => {
if (borrowList != null)
this.pages[1].badge = borrowList.length;
}
);
The observer in the uninstantiated child component subscribe in the following manner:
export class BorrowViewPage {
items$: Observable<Borrow>;
constructor(public navCtrl: NavController, public catalogService: CatalogService, public navParams: NavParams) {
this.items$ = this.catalogService.borrow$;
}
}
I want both of them to subscribe to a HTTP request and continue to respond whenever I make the function call in the main component or elsewhere: this.catalogService.getBorrowView()
However, this method only works once. It works fine on the child component. It just doesn't work after the first time for the main component. I tried unsubscribe it and subscribe it back, but it ended up firing too early yielding the wrong result.
angular typescript ionic-framework
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
I am trying to figure how to use ReplaySubject such that its observers can fire repeatedly when it subscribes to a new observable (e.g. HTTP GET).
This is provider that I used:
export class CatalogService {
public borrow$: ReplaySubject<Borrow> = new ReplaySubject<Borrow>(null);
constructor(public http: HttpClient) {
}
public getBorrowView() {
this.http.get<Borrow>(apiUrl + 'Borrow/View').subscribe(this.borrow$);
}
...
}
I have two observers - one in the main component and the other in the uninstantiated child component.
The observer in the main component subscribe in the following manner:
this.catalogService.borrow$.subscribe(
borrowList => {
if (borrowList != null)
this.pages[1].badge = borrowList.length;
}
);
The observer in the uninstantiated child component subscribe in the following manner:
export class BorrowViewPage {
items$: Observable<Borrow>;
constructor(public navCtrl: NavController, public catalogService: CatalogService, public navParams: NavParams) {
this.items$ = this.catalogService.borrow$;
}
}
I want both of them to subscribe to a HTTP request and continue to respond whenever I make the function call in the main component or elsewhere: this.catalogService.getBorrowView()
However, this method only works once. It works fine on the child component. It just doesn't work after the first time for the main component. I tried unsubscribe it and subscribe it back, but it ended up firing too early yielding the wrong result.
angular typescript ionic-framework
angular typescript ionic-framework
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
edited Nov 15 '18 at 22:53
Ice Drake
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
asked Nov 15 '18 at 10:02
Ice DrakeIce Drake
6910
6910
Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47
add a comment |
Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47
Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47
add a comment |
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Could you please explain us what you goal is, and provide the code you have tried to reach it ? What you have posted is a solution you think will work, which makes your question a XY problem.
– trichetriche
Nov 15 '18 at 10:07
I didn't notice that adding additional information can be misleading. I removed what I attempted and left only of what I want to do and problem I encountered in doing so.
– Ice Drake
Nov 15 '18 at 22:47