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Questions tagged [reactive-extensions-js]

The Reactive Extensions for JavaScript is a set of libraries to compose asynchronous, resilient and responsive event driven programs using observable collections with ECMA Script5 Array#extras style composition in JavaScript.

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How to delay retrying to send an HTTP request with RxJS5?

I'm having problems with making an RxJS5 observable stream behave in a way that I want it to. The stream is supposed to send an HTTP request to a website using axios, and if the response is an HTTP error (which axios coerces to a JavaScript error),…
Reinis Riekstins
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rxjs with multiple forkjoin when doing http requests

I am doing some http requests and use rxjs for successfull notification of the result: getReportings(departmentId: number): Observable { return Observable.forkJoin( this.http.get('/api/members/' + departmentId).map(res =>…
Elisabeth
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Combine multiple Observables with different actions/operations

I'm building an Angular2 app, so I'm getting used to Observables and Reactive Extensions as a whole. I'm using TypeScript and rxjs. Now I've got an observable, or a stream if you will, of an array of some objects. Let's say Person-objects. Now I've…
YentheO
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Convert Array to Observable, perform transformations and return again as Array?

In ngOnInit() I have "return x" which I want to put into Observable, then perform transformations and return again in the same format. Here is the working plunker: http://plnkr.co/edit/z26799bSy17mAL4P5MiD?p=preview import {Component} from…
Teddy
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RxJs: access data before flatMapLatest after flatMapLatest finished

Scenario: User uses filters which are combined into single stream When filters change, event to the backend is fired to get "cheap" data When "cheap" data arrives, another request, with same parameters is fired to different endpoint, that returns…
gerasalus
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Access variables later in the chain

In the example below I'm taking a user and creating a directory for that user. I want to simply log that the user as been created. What's the best way to get access to the user variable later in the chain? let ensureUser$ = ghUser$ .map(u =>…
ThomasReggi
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Proper way to deal with errors thrown in "onNext" for hot, shared, observables

In RxJS version 5, the following code results in the process being terminated after three iterations of both subscriptions: var Rx = require("rxjs"); const published$ = Rx.Observable.interval(1000).publish(); published$.subscribe(index => { …
user19302
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How to handle errors in RxJS using Angular

I'm working on an Angular application which shows a list of items fetched from a RESTful API. The content of the list depends on a query. The query can be passed either by filling in an input field, using a submit button or by adding it to the URL…
ndequeker
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Merge implemented as flatMap

Theoretically it should be possible to implement any RxJS operator (except just() and flatMap()) through flatMap(). For instance map() can be implemented as function map(source, selector) { return source.flatMap(x =>…
André Staltz
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Will Rx.Observable.groupBy clean up empty streams?

In a Node application I'm trying to process a stream of events using RxJS. The event stream is a list of changes to many documents. I'm using groupBy to partition the stream into new streams by documentId. But I'm wondering, once a document is…
Dustin Martin
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Safe update for 2 dependent streams

As an exercise I'm trying to build 2 dependent streams which update one another. The test application is simply an "Inches <-> Centimeters" converter, with both inputs editable. The issue I am experiencing is that I cannot get how can I stop…
zerkms
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What is the difference between switchLatest and flatmapLastest in RxJs

I am having difficulty in seeing the difference between switchLatest and flatmapLatest in RxJs with the difference being one flattens a nested observable affer the fact like in scala whilst the other is the equivalent of doing it before returning…
Blair Davidson
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RxJS sending multiple unique ajax requests on event

If I have an event type; say a click event. That I want to fire 3 unique ajax requests for but I want to subscribe to the final result of all 3 requests What is the proper design pattern for this sequence. My current code block looks something like…
Jonathan Sheely
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Example using observables as promises

Does anyone have an example of how RX observables can be used to help the look of asynchronos code? I am looking for an alternative to promises and I would like to see how it is done in rx.
dagda1
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Is anybody using rx.jquery?

Trying to get my feet wet with RxJS, specifically with rx.jquery. I found a little tutorial here and tried to set it up as follows. It's supposed to take what you type and offer suggestions, pulled from Wikipedia. The call to Wikipedia is successful…
Roy J
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