rxjs

问题 I need to return value from subscribe of a service call. here is my code export class RideDataSource extends DataSource<any> { rides: Ride[]; constructor(private _rideService: RidesService, private _paginator: MatPaginator) { super(); } connect(): Observable<Ride[]> { this._rideService.getActiveRides(this._paginator.pageIndex, this._paginator.pageSize).subscribe( ridePage => { this.rides = ridePage.content; this._paginator.length = ridePage.totalElements; } ); // i need to return Observable

问题 I'm creating a simple forum. I'm looking to filter the posts. I have some trouble with .pipe and .filter in RxJS. I'm trying to: Retrieve the list of in-memory-api posts from api/posts , which when used with http.get it returns an Observable<Post[]> Iterate through each Post in the Observable<Post[]> and filter it so it only selects, says, each post with an id of 1 (only one post with id 1 exists). Log to the console any errors or if the function had success The filter does not select each

问题 I have two RX infinite streams (let's call them mainValues and decoratorValues ). The one called mainValues are adding elements to a list called valueList . The other stream ( decoratorValues ) should assign properties to these elements in the list. Elements in the two streams are arriving at random times in random order , and I need to solve it in either order that mainValues are put into the list as soon as available , while decoratorValues are not lost until their corresponding elements

问题 Sorry for the title, I couldn't think of a better one. I've got this piece of code, which basically: filter for valid (non-null) cron epressions' arrays map each cron expression to a call to a service this.formGroup.valueChanges.pipe( op.filter(v => !!v.cronExpressions), op.map((v): string[] => v.cronExpressions), op.map((v: string[]) => v.map(cron => this.cronService.getReadableForm(cron).pipe( op.map(this.toDescription), op.map((description): CronExpressionModel => ({ cron, description }))

问题 I want to use the global error handler to handle access tokens expiring and refreshing them using the refresh token. My solution that almost seems to work is as follows: rom your component, subscribe to an observable as follows: this.myHttpService.getSomeData().subscribe(response => { console.log('user logged in', response ); }, error => { // optionally do something custom here. console.log(error); throw error; // we could handle the error here, getting the new auth token and calling this

问题 How can I use RxJS to buffer function calls until another async function has resolved? Here is a simple example of what I'd like to accomplish function asyncFunc(time) { setTimeout(() => { console.log('asyncFunc has resolved'); }, time); } function funcToBuffer(time) { setTimeout(() => { console.log(time); }, time); } asyncFunc(3000); funcToBuffer(1000); funcToBuffer(2000); funcToBuffer(4000); funcToBuffer(5000); asyncFunc(8000); funcToBuffer(6000); funcToBuffer(7000); At the moment this code

问题 I have a component that displays the title and artist of a particular video. When I call playNext() in my service, it's supposed to update the title and artist with a new data. I do a console.log and I could verify that the subscription works. I get an updated value everytime playNext() is called, however the value in the template does not get updated. It only displays correctly the first time. Am I missing something? Here is my component code @Component({ selector: 'ntv-now-playing',

问题 I have an Observable that I'm using to convert a promise into a subscription. This results in a collection that I need to iterate through to call an HTTP Service on each element. I'm using forkJoin to wait for all those calls to finish so that I can do something else, but unfortunately, my subscription is not being called. Do you see what I'm missing here? Observable.fromPromise(this.users.getElements()).subscribe(results => { Observable.forkJoin( results.map( aUser => this.HttpService

问题 I have a many to many relationship: [persons]x------1[personsPets]1------x[pets] [persons] id name [pets] id name [personsPets] id personId petId Using @angular/fire and rxjs 6, I want a service to get the persons array with their pets each, like that: this.personService.getPersons().subscribe(persons => { const firstPersonPetNames: string[] = persons[0].pets.map(pet => pet.name) const secondPersonPetNames: string[] = persons[1].pets.map(pet => pet.name) console.log(firstPersonPetNames) // [

问题 I am trying to use RxJS with Typescript and downloaded everything what I need. Then I wanted to test if the code works: As you can see Rx.Observable.range the range method is marked as red. I look into the Observable.ts and search for range method, it does not find. But it exists under the folder observable a range.ts file. What am I doing wrong? 来源： https://stackoverflow.com/questions/38889155/rx-observable-range-is-missing-in-typescript