Subscriber not assigned on Observable create












1















I am doing this in code in order to handle multiple views from multiple components



https://stackblitz.com/edit/angular-cy8jza
(check the console for the error)



export class ViewGroup {

    _onViewChanged: any;

    OnViewChanged$ : Observable<any>;

    _onViewAdded: any;

    OnViewAdded$ : Observable<any>;

    _onViewRemoved: any;

    OnViewRemoved$ : Observable<any>;



    viewsSet = new Set<string>();

    currentView = "";

    previousView = "";



    constructor(){

    this.OnViewChanged$ = Observable.create(obs => this._onViewChanged = obs);

    this.OnViewAdded$ = Observable.create(obs => this._onViewAdded = obs);

    this.OnViewRemoved$ = Observable.create(obs => this._onViewRemoved = obs);

}

}


somnwhere in the code I do



this._availableView.set(name,  new ViewGroup());


and then call 



this._availableView.get(group)._onViewAdded.next(view);


but I can't call the next on it, it s say undefined.



It's exactly the same procedure has 



this.onGroupAdded$ = Observable.create(e => this._onGroupAdded = e)


but this one work in stackblitz.



EDIT : I found out that the method I pass inside the create is not called until I subscribe to it. I have to do this to make everything works :



this.OnViewChanged$ = Observable.create((obs) => {this._onViewAdded = obs});

this.OnViewAdded$ = Observable.create((obs) => {this._onViewAdded = obs});

this.OnViewRemoved$ = Observable.create((obs) => {this._onViewAdded = obs});

this.OnViewChanged$.subscribe();

this.OnViewAdded$.subscribe();

this.OnViewRemoved$.subscribe();


Is there any way to avoid it ?






angular events rxjs observable







share|improve this question





























    1















    I am doing this in code in order to handle multiple views from multiple components



    https://stackblitz.com/edit/angular-cy8jza
    (check the console for the error)



    export class ViewGroup {
    
    _onViewChanged: any;
    
    OnViewChanged$ : Observable<any>;
    
    _onViewAdded: any;
    
    OnViewAdded$ : Observable<any>;
    
    _onViewRemoved: any;
    
    OnViewRemoved$ : Observable<any>;
    

    
    viewsSet = new Set<string>();
    
    currentView = "";
    
    previousView = "";
    

    
    constructor(){
    
    this.OnViewChanged$ = Observable.create(obs => this._onViewChanged = obs);
    
    this.OnViewAdded$ = Observable.create(obs => this._onViewAdded = obs);
    
    this.OnViewRemoved$ = Observable.create(obs => this._onViewRemoved = obs);
    
}
    
}


    somnwhere in the code I do



    this._availableView.set(name,  new ViewGroup());


    and then call 



    this._availableView.get(group)._onViewAdded.next(view);


    but I can't call the next on it, it s say undefined.



    It's exactly the same procedure has 



    this.onGroupAdded$ = Observable.create(e => this._onGroupAdded = e)


    but this one work in stackblitz.



    EDIT : I found out that the method I pass inside the create is not called until I subscribe to it. I have to do this to make everything works :



    this.OnViewChanged$ = Observable.create((obs) => {this._onViewAdded = obs});
    
this.OnViewAdded$ = Observable.create((obs) => {this._onViewAdded = obs});
    
this.OnViewRemoved$ = Observable.create((obs) => {this._onViewAdded = obs});
    
this.OnViewChanged$.subscribe();
    
this.OnViewAdded$.subscribe();
    
this.OnViewRemoved$.subscribe();


    Is there any way to avoid it ?






    angular events rxjs observable







    share|improve this question



























      1












      1








      1








      I am doing this in code in order to handle multiple views from multiple components



      https://stackblitz.com/edit/angular-cy8jza
      (check the console for the error)



      export class ViewGroup {
      
    _onViewChanged: any;
      
    OnViewChanged$ : Observable<any>;
      
    _onViewAdded: any;
      
    OnViewAdded$ : Observable<any>;
      
    _onViewRemoved: any;
      
    OnViewRemoved$ : Observable<any>;
      

      
    viewsSet = new Set<string>();
      
    currentView = "";
      
    previousView = "";
      

      
    constructor(){
      
    this.OnViewChanged$ = Observable.create(obs => this._onViewChanged = obs);
      
    this.OnViewAdded$ = Observable.create(obs => this._onViewAdded = obs);
      
    this.OnViewRemoved$ = Observable.create(obs => this._onViewRemoved = obs);
      
}
      
}


      somnwhere in the code I do



      this._availableView.set(name,  new ViewGroup());


      and then call 



      this._availableView.get(group)._onViewAdded.next(view);


      but I can't call the next on it, it s say undefined.



      It's exactly the same procedure has 



      this.onGroupAdded$ = Observable.create(e => this._onGroupAdded = e)


      but this one work in stackblitz.



      EDIT : I found out that the method I pass inside the create is not called until I subscribe to it. I have to do this to make everything works :



      this.OnViewChanged$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewAdded$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewRemoved$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewChanged$.subscribe();
      
this.OnViewAdded$.subscribe();
      
this.OnViewRemoved$.subscribe();


      Is there any way to avoid it ?






      angular events rxjs observable







      share|improve this question
















      I am doing this in code in order to handle multiple views from multiple components



      https://stackblitz.com/edit/angular-cy8jza
      (check the console for the error)



      export class ViewGroup {
      
    _onViewChanged: any;
      
    OnViewChanged$ : Observable<any>;
      
    _onViewAdded: any;
      
    OnViewAdded$ : Observable<any>;
      
    _onViewRemoved: any;
      
    OnViewRemoved$ : Observable<any>;
      

      
    viewsSet = new Set<string>();
      
    currentView = "";
      
    previousView = "";
      

      
    constructor(){
      
    this.OnViewChanged$ = Observable.create(obs => this._onViewChanged = obs);
      
    this.OnViewAdded$ = Observable.create(obs => this._onViewAdded = obs);
      
    this.OnViewRemoved$ = Observable.create(obs => this._onViewRemoved = obs);
      
}
      
}


      somnwhere in the code I do



      this._availableView.set(name,  new ViewGroup());


      and then call 



      this._availableView.get(group)._onViewAdded.next(view);


      but I can't call the next on it, it s say undefined.



      It's exactly the same procedure has 



      this.onGroupAdded$ = Observable.create(e => this._onGroupAdded = e)


      but this one work in stackblitz.



      EDIT : I found out that the method I pass inside the create is not called until I subscribe to it. I have to do this to make everything works :



      this.OnViewChanged$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewAdded$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewRemoved$ = Observable.create((obs) => {this._onViewAdded = obs});
      
this.OnViewChanged$.subscribe();
      
this.OnViewAdded$.subscribe();
      
this.OnViewRemoved$.subscribe();


      Is there any way to avoid it ?






      angular events rxjs observable




      angular events rxjs observable






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 20 '18 at 5:09







      Crocsx

















      asked Nov 20 '18 at 5:03









      CrocsxCrocsx

      5141416




      5141416
























          1 Answer
          1






          active

          oldest

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          2














          If I understand your case correctly, I think what you are looking for is a subject.



          You are correct that observables don't run until they get subscribed to. You can find many references to that in all sorts of docs, for example: angular docs for observables.



          So instead of creating the observables using the create method. Try declaring them as subjects. Check out how they are being used in angular docs here for more details: https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service.






          share|improve this answer
























          • I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

            – Crocsx
            Nov 20 '18 at 5:34













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          1 Answer
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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          If I understand your case correctly, I think what you are looking for is a subject.



          You are correct that observables don't run until they get subscribed to. You can find many references to that in all sorts of docs, for example: angular docs for observables.



          So instead of creating the observables using the create method. Try declaring them as subjects. Check out how they are being used in angular docs here for more details: https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service.






          share|improve this answer
























          • I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

            – Crocsx
            Nov 20 '18 at 5:34


















          2














          If I understand your case correctly, I think what you are looking for is a subject.



          You are correct that observables don't run until they get subscribed to. You can find many references to that in all sorts of docs, for example: angular docs for observables.



          So instead of creating the observables using the create method. Try declaring them as subjects. Check out how they are being used in angular docs here for more details: https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service.






          share|improve this answer
























          • I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

            – Crocsx
            Nov 20 '18 at 5:34
















          2












          2








          2







          If I understand your case correctly, I think what you are looking for is a subject.



          You are correct that observables don't run until they get subscribed to. You can find many references to that in all sorts of docs, for example: angular docs for observables.



          So instead of creating the observables using the create method. Try declaring them as subjects. Check out how they are being used in angular docs here for more details: https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service.






          share|improve this answer













          If I understand your case correctly, I think what you are looking for is a subject.



          You are correct that observables don't run until they get subscribed to. You can find many references to that in all sorts of docs, for example: angular docs for observables.



          So instead of creating the observables using the create method. Try declaring them as subjects. Check out how they are being used in angular docs here for more details: https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 20 '18 at 5:28









          lupus137lupus137

          27317




          27317













          • I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

            – Crocsx
            Nov 20 '18 at 5:34





















          • I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

            – Crocsx
            Nov 20 '18 at 5:34



















          I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

          – Crocsx
          Nov 20 '18 at 5:34







          I went over this documentation, but I think I interpreted it wrongly, because I reimplemented everything and it work like charm... I closed the other post, cause yo usolve booth problem with this. thank you !

          – Crocsx
          Nov 20 '18 at 5:34




















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