rxjs5

问题 I'm migrating an ionic 3.8 app to 3.9.2. This migration includes an update to RXJS 5.5 I'm now experiencing this error: TypeError: this._subscribe is not a function. (In 'this._subscribe(sink)', 'this._subscribe' is an instance of t) After hours of debugging, I found out that this code portion is related to the error: protected observeConnectionState() { // rxjs/observable/of of(new Event('disconnect')) .pipe( // rxjs/operators/merge merge(connect$), merge(disconnect$), // Map eventname to

问题 Suppose I requested for data in angularfire2 like this: var ref = new Firebase("firebase url"); Now how can I apply rxjs operator like map operator to the data coming 回答1: I don't think you are looking at angularfire2 there - that's v1 code... You can use the rxjs operators in angularfire2 - the data is returned as an Observable (FirebaseListObservable or FirebaseObjectObservable) - so you can import and apply any of the rxjs operators to those... In general, you just assign the data to a

问题 I upgraded my Angular application from version 5.2 to 6.0 with the instructions from https://update.angular.io. Now my Angular application doesn't build because of the "rxjs-5-to-6-migrate" migration: ERROR in bla.ts: error TS2339: Property 'map' does not exist on type 'Observable'. I have the following imports: import { Observable } from 'rxjs/observable'; import { of } from 'rxjs/observable/of'; import { map } from 'rxjs/operators'; If I change the imports like this it works: import {

问题 I keep reading rxjs documentation but getting lost in all the operators.. this is what i got so far let obs = Observable.from([1, 3, 5]) so what i need this to do is take() some set amount from the array. use the results in a post request, when that comes out successful then i need to restart the process. I want to collect all the results, and keep progress as the process is going (for a progress bar) I don't need the code for all of that. what i really need to know is how to use rxjs to

问题 From picture to code? How to get the Out observable from Data and Gates? Data is an observable of any kind e.g. JSON objects to be sent to a remote backend Gates is a boolean observable, where the ticks correspond to true and the crosses to false. For example, Internet connectivity whereby true means the network became accessible and false reflects a disconnection. Out is the resulting observable, which emits the same as Data, sometimes immediately, sometimes with a delay, depending on the

问题 Let's say I have two classes, where you can observe over some observables. First example, with public subject: class EventsPub { public readonly onEnd = new Subject<void>(); } Second example, with private subject and registering method: class EventsPriv { private readonly endEvent = new Subject<void>(); public onEnd(cb: () => void): Subscription { return this.endEvent.subscribe(cb); } } The first example is somehow unsafe because anyone can call eventsPub.endEvent.next() from outside the

问题 I'm able to create 2 observables to watch mouse move and click events as such: var mousemove$ = Rx.Observable.fromEvent(document, 'mousemove'); var click$ = Rx.Observable.fromEvent(document, 'click'); I'm also able to use merge() and debounceTime() to wait for either mousemove or click to not happen for 10 seconds like this: var allactivity$ = Rx.Observable.merge( mousemove$.mapTo('Mouse!'), click$.mapTo('Click!') ); var lastact$ = allactivity$.debounceTime(10000); However, I would like to

问题 Hi I'm relatively new to Angular2, Karma and Jasmine. Currently I'm using Angular 2 RC4 Jasmine 2.4.x I have an Angular 2 service which periodically calls an http service like this: getDataFromDb() { return Observable.timer(0, 2000).flatMap(() => { return this.http.get(this.backendUrl) .map(this.extractData) .catch(this.handleError); }); } Now I want to test the functionality. For testing purposes I have just tested the "http.get" on a separate function without the Observable.timer by doing:

问题 From my understanding of Angular and RxJs there are two ways to terminate Observables. You can unsubscribe() from them or use takeUntil() and complete() . Below are examples of each approach (in pseudocode). The unsubscribe() approach private _id: number; private _subscriptions: Subscription[] = []; constructor(private _route: ActivatedRoute) { this._getId(); } public ngOnDestroy(): void { this._subscriptions.forEach( subscription => subscription.unsubscribe() ); } private _getId(): void {

问题 There is existing subject that is in use: const fooSubject = new BehaviorSubject(null); And there is another observable (another subject in this example): const barSubject = new Subject(); barSubject.subscribe( value => fooSubject.next(), err => fooSubject.error(err), () => fooSubject.complete() ); barSubject.next('bar'); The code works but looks clumsy. Is there a better way to pipe (in broad sense, not necessarily using pipe operator) barSubject observable to fooSubject ? It looks like an