rxjs

问题 I am trying to create an observable (fixedObservable here) which will be fed by multiple dynamically created observable over time. Whenever a subscription is made than the subscriber should get the most recent value from the fixedObservable. Although I have achieved it but I wanted to know if there is any simple solution to it. You can find the code here https://jsfiddle.net/dzm2t3pa/8/ . Thanks var resultdiv = document.getElementById('result'); function print(message) { var paraEl = document

问题 I'm using angular w/ rxjs to observe user events on the interface. However, I'm having this really simple problem with passing arguments to a method in an arrow function. Here is the problem: This is not working : searchterm is not being passed to this.searchFacilities ngOnInit() { this.searchTerm$.subscribe(searchterm => this.searchFacilities);/**Not working here**/ } searchFacilities(term: string){ console.log(term); this.facilityservice.searchFacilities(term) .subscribe(results => this

问题 I have two observable that I am listening too with the merge operator when one of them is fire, or both I need to execute the handler only once, How can I do this with rx? var source1 = Rx.Observable.interval(1000); var source2 = Rx.Observable.interval(1000); var source = Rx.Observable.merge( source1, source2) .subscribe(() => console.log('This needs to run only once and not kill the stream')) 回答1: You can use selector function of multicast Optional selector function that can use the

问题 For some reason I can get this code to work in Chrome but did not find a solution for Safari and IE. I haven't tried Firefox yet. My project is using the typescript transpiler. constructor(){ this.eventStream = Observable.fromEvent(window,'resize'); this.eventStream.subscribe((event) => this.updateWindow(event)); } ngOnInit(){ this.updateWindow(); } updateWindow(event:any){ this.updateHeight = window.innerHeight; } Plunker example 回答1: Your code works in Firefox, but not in Safari and IE, it

问题 I'm trying to read JSON from a file, filter out stuff I don't want and possibly map and flatten the JSON elements, and then for each filtered JSON line in the file call a function that returns a promise. (Basically tail -f from a bunyan produced file). Additional Requirement: I want the pacing to be based on how fast the functions resolve the promise (output pacing, one element at a time, like Promise.each) Sounds like a great use for RXJS and promises, right? Well, except that all the

问题 I am trying RxJS. My use case is to parse a log file and group lines by topic ( i.e.: the beginning of the group is the filename and then after that I have some lines with user, date/time and so on) I can analyse the lines using regExp. I can determine the beginning of the group. I use ".scan" to group the lines together, when I've the beginning of new group of line, I create an observer on the lines I've accumulated ... fine. The issue is the end of the file. I've started a new group, I am

问题 I have a simple question. RxJS v5 uses marble diagrams for its testing (example here). Is it possible to use the same technique in RxJS v4 and if so, how to ? 回答1: You can always roll your own: here's a simple function to convert a string to a cold observable that emits string values: // string -> Observable<string> function fromMarble(s) { const items = s.split('-') .filter(x => x); return Rx.Observable.from(items); } fromMarble('--1--2--cheese--4--5').subscribe(x => console.log(x)); // >> 1

问题 I have an observable like this: const records$ = Rx.DOM.fromWebSocket('ws://192.168.2.4:9001/feed/', null) .map(ev => parseRecord(ev.data)) .share(); I have many subscribers. When the connection is lost, all subscribers unsubscribe: let records$Subscription; records$Subscription = records$.subscribe( record => { ... }, error => records$Subscription.dispose() ); I verified that the call to dispose is indeed being made once for every subscription. Therefore, the share refcount has reached zero.

问题 I'm playing with angular2 alpha 40 with ng2-play starter from pawel. Examples are in typescript. I have a service MovieList like this: export class Movie { selected: boolean = false constructor(public name:string, public year:number, public score:number) {} } export class MovieListService { list: Array<Movie> selectMovie = new EventEmitter(); constructor() { this.list = [new Movie('Star Wars', 1977, 4.4)]; } add(m:Movie) { this.list.push(m); } remove(m:Movie) { for(var i = this.list.length -

问题 I have an ngFor with async like that: <div *ngFor="let location of googleSearchLocations | async"> <div *ngFor="let location of facebookSearchLocations | async"> and this is my component: private searchTerms = new Subject<string>(); googleSearchLocations: Observable<GoogleLocation[]>; facebookSearchLocations: Observable<FacebookLocation[]>; ngOnInit(): void { this.googleSearchLocations = this.searchTerms .debounceTime(300) .switchMap(term => term ? this.locationService.getGoogleLocations(term