angular - site - what is meteor




Tentativa de usar uma exibição destruída: detectChanges (10)

A única solução que funcionou para mim foi:

if (!this.changeDetectionRef['destroyed']) {
    this.changeDetectionRef.detectChanges();
}

Eu estou criando uma interface do usuário simples usando Angular Meteor 2.

1) Eu tenho um componente top navbar que tem um botão 'logout'.
2) Ao clicar no botão 'logout', ele redireciona para 'login'.
3) Então eu vejo este erro no console: EXCEPTION: Attempt to use a destroyed view: detectChanges

Exceção:

EXCEPTION: Attempt to use a destroyed view: detectChanges
browser_adapter.js:77 EXCEPTION: Attempt to use a destroyed view: detectChangesBrowserDomAdapter.logError @ browser_adapter.js:77BrowserDomAdapter.logGroup @ browser_adapter.js:87ExceptionHandler.call @ exception_handler.js:57(anonymous function) @ application_ref.js:265schedulerFn @ async.js:123SafeSubscriber.__tryOrUnsub @ Subscriber.js:225SafeSubscriber.next @ Subscriber.js:174Subscriber._next @ Subscriber.js:124Subscriber.next @ Subscriber.js:88Subject._finalNext @ Subject.js:128Subject._next @ Subject.js:120Subject.next @ Subject.js:77EventEmitter.emit @ async.js:112onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:66ZoneDelegate.handleError @ angular2-polyfills.js:394Zone.runTask @ angular2-polyfills.js:323ZoneTask.invoke @ angular2-polyfills.js:490
browser_adapter.js:77 STACKTRACE:BrowserDomAdapter.logError @ browser_adapter.js:77ExceptionHandler.call @ exception_handler.js:59(anonymous function) @ application_ref.js:265schedulerFn @ async.js:123SafeSubscriber.__tryOrUnsub @ Subscriber.js:225SafeSubscriber.next @ Subscriber.js:174Subscriber._next @ Subscriber.js:124Subscriber.next @ Subscriber.js:88Subject._finalNext @ Subject.js:128Subject._next @ Subject.js:120Subject.next @ Subject.js:77EventEmitter.emit @ async.js:112onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:66ZoneDelegate.handleError @ angular2-polyfills.js:394Zone.runTask @ angular2-polyfills.js:323ZoneTask.invoke @ angular2-polyfills.js:490
browser_adapter.js:77 Error: Attempt to use a destroyed view: detectChanges
    at ViewDestroyedException.BaseException [as constructor] (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:3349:23)
    at new ViewDestroyedException (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:10626:16)
    at DebugAppView.AppView.throwDestroyedError (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:11277:72)
    at DebugAppView.AppView.detectChanges (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:11230:18)
    at DebugAppView.detectChanges (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:11321:44)
    at ViewRef_.detectChanges (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:11011:65)
    at http://localhost:3000/app/app.js?hash=323b1216814e80ed467d95bcda255eb217d7c468:2224:23
    at ZoneDelegate.invokeTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4721:174)
    at Object.onInvokeTask (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:9393:41)
    at ZoneDelegate.invokeTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4721:72)
  -------------   Elapsed: 80 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMacroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4652:47)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4467:37
    at setTimeout (eval at createNamedFn (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5346:24), <anonymous>:3:37)
    at new TopNavbarComponent (http://localhost:3000/app/app.js?hash=323b1216814e80ed467d95bcda255eb217d7c468:2221:9)
    at DebugAppView._View_HomeComponent0.createInternal (HomeComponent.template.js:48:34)
    at DebugAppView.AppView.create (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:11098:21)
  -------------   Elapsed: 2 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at resolvePromise (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4893:29)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4930:25
    at ZoneDelegate.invokeTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4721:174)
    at Object.onInvokeTask (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:9393:41)
  -------------   Elapsed: 0 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at ZoneAwarePromise.then (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5011:25)
    at RuntimeCompiler.resolveComponent (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:40230:14)
    at DynamicComponentLoader_.loadNextToLocation (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:10788:31)
    at RouterOutlet.activate (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:26844:26)
  -------------   Elapsed: 0 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at resolvePromise (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4893:29)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4877:21
    at ZoneDelegate.invoke (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4696:161)
    at Object.onInvoke (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:9402:41)
  -------------   Elapsed: 0 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at resolvePromise (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4893:29)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4877:21
    at ZoneDelegate.invoke (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4696:161)
    at Object.onInvoke (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:9402:41)
  -------------   Elapsed: 0 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at resolvePromise (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4893:29)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4930:25
    at ZoneDelegate.invokeTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4721:174)
    at Object.onInvokeTask (http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:9393:41)
  -------------   Elapsed: 1 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at ZoneAwarePromise.then (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5011:25)
    at http://localhost:3000/packages/modules.js?hash=560db94ec01c0b3e8f499491ffcce7a2ec6c3c5e:26895:53
    at http://localhost:3000/packages/meteor.js?hash=ae8b8affa9680bf9720bd8f7fa112f13a62f71c3:1105:22
    at ZoneDelegate.invoke (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4696:161)
  -------------   Elapsed: 0 ms; At: Wed Jun 15 2016 20:22:09 GMT-0700 (PDT)   -------------  
    at Object.onScheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:5734:30)
    at ZoneDelegate.scheduleTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4704:57)
    at Zone.scheduleMicroTask (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4649:47)
    at scheduleResolveOrReject (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4928:22)
    at resolvePromise (http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4893:29)
    at http://localhost:3000/packages/barbatus_angular2-runtime.js?hash=fda9b73362c52e988ad030102a9f58e4d584cda3:4877:21
    at http://localhost:3000/packages/meteor.js?hash=ae8b8affa9680bf9720bd8f7fa112f13a62f71c3:1105:22BrowserDomAdapter.logError @ browser_adapter.js:77ExceptionHandler.call @ exception_handler.js:60(anonymous function) @ application_ref.js:265schedulerFn @ async.js:123SafeSubscriber.__tryOrUnsub @ Subscriber.js:225SafeSubscriber.next @ Subscriber.js:174Subscriber._next @ Subscriber.js:124Subscriber.next @ Subscriber.js:88Subject._finalNext @ Subject.js:128Subject._next @ Subject.js:120Subject.next @ Subject.js:77EventEmitter.emit @ async.js:112onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:66ZoneDelegate.handleError @ angular2-polyfills.js:394Zone.runTask @ angular2-polyfills.js:323ZoneTask.invoke @ angular2-polyfills.js:490
Subscriber.js:229 Uncaught Attempt to use a destroyed view: detectChanges

top-navbar.component.ts

"use strict";
import {Logger} from "../services/logger.service";
import {Component, ChangeDetectionStrategy, ChangeDetectorRef} from '@angular/core';
import {User} from "../models/user";
import {Router} from '@angular/router-deprecated';
import {UserService} from "../services/user.service";
import {CORE_DIRECTIVES} from '@angular/common';
import {DROPDOWN_DIRECTIVES} from '../../node_modules/ng2-bootstrap';

@Component({
    selector: 'top-navbar',
    templateUrl: 'client/top-navbar/top-navbar.html',
    bindings: [UserService, Logger],
    directives: [CORE_DIRECTIVES, DROPDOWN_DIRECTIVES]
})

export class TopNavbarComponent {

    public user:User;

    public statusDropdown = {
        isOpen: false
    };

    constructor(private userService:UserService, private router:Router, private logger:Logger, private ref:ChangeDetectorRef) {
        setTimeout(() => {
            this.ref.markForCheck();
            this.user = this.userService.getLoggedInUser();
            this.ref.detectChanges();
        }, 0)
    }

    logout() {
        this.logger.warn('[Top Navbar] Logging out the user.');
        localStorage.clear();
        this.router.navigateByUrl('/login');
    }
}

e este é meu login.component.ts

"use strict";
import { Component, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
import { FormBuilder, ControlGroup, Validators } from '@angular/common';
import { MeteorComponent } from 'angular2-meteor';
import { Router } from '@angular/router-deprecated';
import { Logger } from "../services/logger.service";

@Component({
    selector: 'login',
    templateUrl: 'client/login/login.html',
    changeDetection: ChangeDetectionStrategy.OnPush,
    bindings: [Logger]
})

export class LoginComponent extends MeteorComponent {

    loginForm:ControlGroup;
    loginFailed = false;

    constructor(private _logger:Logger, private _router:Router, private ref:ChangeDetectorRef) {
        super();
        let fb = new FormBuilder();
        this.loginForm = fb.group({
            username: ["", Validators.required],
            password: ["", Validators.required]
        });
    }

    login() {


        this.call('authenticateUser', this.loginForm.value.username, this.loginForm.value.password, (err, data) => {

            if (err) {
                this._logger.error(err);

            } else {
                this._logger.info('[Authentication API] ', data);

                if (data.status != 'LOGIN_SUCCESS') {
                    this.loginFailed = true;

                } else {
                    this.loginFailed = false    ;
                    var user = {
                        id: data.id,
                        name: data.name,
                        role: data.role
                    }
                    localStorage.setItem('user', JSON.stringify(user));
                    this._router.navigate(['Home'])
                }
                //This is required for letting Angular know that something has changed.
                //Because this part of code runs out of Angular zone.
                this.ref.markForCheck();  // Mark this component and its children for change detection in next detecting cycle.
                this.ref.detectChanges(); // Trigger change detection.

            }

        });
    }
}

Bem, essas respostas não me ajudaram. Eu encontrei outra solução.

Componente filho tem saída que é acionada quando o botão "Fechar" é clicado

<child-component
    *ngIf="childComponentIsShown"
    (formCloseEmitter)="hideChildComponent()"
></child-component>

E o método "hideChildComponent ()" no componente pai detecta alterações.

hideChildComponent() {
  this.childComponentIsShown = false;
  this.cdr.detectChanges();
}

Espero que isso ajude alguém.


Eu tenho isso resolvido com:

if (!(<ViewRef>this.cd).destroyed) {
   this.cd.detectChanges();
}

Minha causa aconteceu quando eu estava tentando abrir um diálogo modal com o NgbActiveModal. Aparentemente chamando .dismiss() de seu próprio ngOnInit() causa isso.

export class MyModal {
    constructor(private modalInstance: NgbActiveModal) {
    }

    ngOnInit() {
       if (foo) this.modalInstance.dismiss();
    }

Solução foi esperar um carrapato antes da demissão.

if (foo) setTimeout(() => this.modalInstance.dismiss());


Não muito relacionado a questões específicas, mas eu cheguei aqui pesquisando o mesmo erro, então compartilharei minha solução alternativa. O problema era que eu estava chamando fixture.detectChanges() dentro de fixture.whenStable().then(() => {}) sem agrupar o teste dentro de uma função async .

Antes:

it('should...', () => {
  fixture.whenStable().then(() => {
    fixture.detectChanges();
  });
});

Depois de:

it('should...', async(() => {
  fixture.whenStable().then(() => {
    fixture.detectChanges();
  });
}));

No meu caso, foi um erro gerenciar a configuração do teste assíncrono de configuração e compilação de componentes.

  1. O código com falha tinha um async beforeEach () singular usando TypeScript Async / Await
  2. Para fazê-lo funcionar, estou usando dois beforeEach () s, onde o primeiro manipula Async usando async () do Angular , e o segundo beforeEach () é sync .

Código causando erros ..

beforeEach(async () => {
    await TestBed.configureTestingModule({
        imports: [
            BrowserAnimationsModule
        ],
        providers: [
            { provide: ComponentFixtureAutoDetect, useValue: true },
            { provide: OptionsService, useValue: optionServiceMock },
        ],
        declarations: [EventLogFilterComponent],
        schemas: [NO_ERRORS_SCHEMA]
    }).compileComponents();
    fixture = TestBed.createComponent(EventLogFilterComponent);
    component = fixture.componentInstance;
    optionsService = TestBed.get(OptionsService);
    component.filterElem = jasmine.createSpyObj('filterElem', ['close']);
    fixture.detectChanges();
});

Foi corrigido com ...

beforeEach(async(() => {
    TestBed.configureTestingModule({
        imports: [
            BrowserAnimationsModule
        ],
        providers: [
            { provide: ComponentFixtureAutoDetect, useValue: true },
            { provide: OptionsService, useValue: optionServiceMock },
        ],
        declarations: [EventLogFilterComponent],
        schemas: [NO_ERRORS_SCHEMA]
    }).compileComponents();
}));

beforeEach(() => {
    fixture = TestBed.createComponent(EventLogFilterComponent);
    component = fixture.componentInstance;
    optionsService = TestBed.get(OptionsService);
    component.filterElem = jasmine.createSpyObj('filterElem', ['close']);
    fixture.detectChanges();
});

Para mim, a única solução que funcionou é a seguinte:

ngOnInit() {
    if (this.destroyedComponent) this.changeDetector.reattach();

this.destroyedComponent = false;
this.subscription = this.reactive.channel$.subscribe(msg => {
  switch (msg) {
    case "config:new_data":
      if (!this.destroyedComponent) {
        this.table.initTable();
        this.changeDetector.detectChanges();
      }
  }
})
}

ngOnDestroy() {
   this.subscription = null;
   this.destroyedComponent = true;
   this.changeDetector.detach();
}

Explicação:

  1. Se o componente tiver sido destruído anteriormente, reconecte o detector.
  2. Defina o sinalizador anterior para um valor falso.
  3. Salve a assinatura do RxJs e defina sua lógica desejada.
  4. Embrulhe essa lógica em uma condicional que verifica se o componente foi definido como destruído ou não pelo sinalizador anteriormente declarado.
  5. Realize a detecção desejada de alterações dentro desse bloco.
  6. Defina o método ngOnDestroy () e anule a assinatura, defina o sinalizador destroyComponent como valor truthy e separe o changeDetector.

Simples:

import { OnDestroy } from '@angular/core';
import { Subject } from 'rxjs/Subject';

export class Component implements OnDestroy {
    componentDestroyed: Subject<boolean> = new Subject();

constructor() { }

function() {
   this.service.serviceFunction
     .takeUntil(this.componentDestroyed)
     .subscribe((incomingObservable: Type) => {
       this.variable = incomingObservable;
     });
  }

ngOnDestroy() {
   this._cdRef.detach(); //If you use change dectector
   this.componentDestroyed.next(true);
   this.componentDestroyed.complete();
}

Você pode usar

this.cdref.markForCheck();

em vez de this.cdref.detectChanges(); em muitos casos. Mas a melhor abordagem é seguir @ dicas Al-Mothafar


Você tem que obter o valor do assinante em uma variável e cancelar a inscrição pelo mesmo var. Por favor se refira seguindo o mesmo código

import { Component, OnInit, ChangeDetectionStrategy, ChangeDetectorRef, OnDestroy } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { Cartservice } from './../cartservice.service';
import { ISubscription } from 'rxjs/Subscription';



export class CartComponent implements OnInit, OnDestroy {

private subscription: ISubscription;
ngOnInit() {
    this.subscription = this.cartservice.productsObservable.subscribe(cart => {
      this.cartProducts = cart.products;
      this.cartTotal = cart.cartTotal;
      this.changeDetectorRef.detectChanges();
    });
  }

 ngOnDestroy() {
    this.subscription.unsubscribe();
  }
}

Observe que eu cancelei as alterações no método ngOnDestroy ().





angular2-meteor