Stop next execution of Rxjs observer?

Stop next execution of Rxjs observer?

By : waqar
Date : November 22 2020, 04:01 AM
wish help you to fix your issue This is the way to make it work with observer.error as stated by ABOS. In fact this is his example and it works.
So Just for documentation purposes I answered this question with his answer from the comment.
code :

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RxJs - what's the difference among observer.isStopped, observer.observer.isStopped and observed.m.isDisposed

RxJs - what's the difference among observer.isStopped, observer.observer.isStopped and observed.m.isDisposed

By : user3004376
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , In the function you supply to create, you can return a cleanup function to call when the observer unsubscribes from your observable. You should supply a function which stops your animation frame requests. Here's a working observable that does what you want that I wrote a few years ago:
code :
Rx.Observable.animationFrames = function () {
    /// <summary>
    /// Returns an observable that triggers on every animation frame (see https://developer.mozilla.org/en-US/docs/Web/API/window.requestAnimationFrame ).
    /// The value that comes through the observable is the time(ms) since the previous frame (or the time since the subscribe call for the first frame)
    /// </summary>
    var request = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame,
        cancel = window.cancelAnimationFrame || window.mozCancelAnimationFrame || window.webkitCancelAnimationFrame || window.webkitCancelRequestAnimationFrame ||
            window.msCancelAnimationFrame || window.msCancelRequestAnimationFrame;

    return Rx.Observable.create(function (observer) {
        var requestId,
            startTime = window.mozAnimationStartTime || Date.now(),
            callback = function (currentTime) {
                // If we have not been disposed, then request the next frame
                if (requestId !== undefined) {
                    requestId = request(callback);

                observer.onNext(Math.max(0, currentTime - startTime));
                startTime = currentTime;

        requestId = request(callback);

        return function () {
            if (requestId !== undefined) {
                var r = requestId;
                requestId = undefined;
Rx.Observable.animationFrames().take(5).subscribe(function (msSinceLastFrame) { ... });
rxjs, what's the difference about observer.next() and observer.onNext()?

rxjs, what's the difference about observer.next() and observer.onNext()?

By : Saiashish
Date : March 29 2020, 07:55 AM
it should still fix some issue These are the same. See https://github.com/ReactiveX/rxjs/blob/master/MIGRATION.md#observer-interface-changes-also-subjects.
Website http://reactivex.io/rxjs/ is automatically generated from RxJS 5 docblocks.
RxJS: How to delay execution of the ELSE in RxJS.Observable.if?

RxJS: How to delay execution of the ELSE in RxJS.Observable.if?

By : Cass
Date : March 29 2020, 07:55 AM
Hope this helps Your then/else observable creation is not wrapped in a function, so the else observable setup code is ran when passing to the Observable.of(...) function. You probably need to just use regular if/else type of logic:
code :
const actions = !t ? nodeActions.requestGenesisHashes() :
  nodeActions.treasureHunt({ genesisHash: t.genesisHash });

return Observable.of(actions);
return Observable.if(
  () => !t,
  Observable.create(obs => {
    obs.next(nodeActions.treasureHunt({ genesisHash: t.genesisHash }));
In RxJS, does Observer get injected into Observable execution?

In RxJS, does Observer get injected into Observable execution?

By : CanadaPHP
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The Observable creation process flows as follows:
An Observable is defined by the author (here manually with new, for purposes of the explanation):
code :
const myObservable = new Observable(function subscribe(subscriber) {
  return function tearDownLogic() {
    console.log('runs when Observable for whatever reason is done (complete, error, or unsubscribed)')
constructor(subscribe?: (this: Observable<T>, subscriber: Subscriber<T>) => TeardownLogic) {
  if (subscribe) {
    this._subscribe = subscribe;
const observer = {
  next(v) {
  error(err) {
  complete() {
    console.log('Observable has now completed and can no longer emit values to observer');
  subscribe(observerOrNext?: PartialObserver<T> | ((value: T) => void),
            error?: (error: any) => void,
            complete?: () => void): Subscription {

    const { operator } = this;
    const sink = toSubscriber(observerOrNext, error, complete);

    if (operator) {
      sink.add(operator.call(sink, this.source));
    } else {
        this.source || (config.useDeprecatedSynchronousErrorHandling && !sink.syncErrorThrowable) ?
        this._subscribe(sink) :

    if (config.useDeprecatedSynchronousErrorHandling) {
      if (sink.syncErrorThrowable) {
        sink.syncErrorThrowable = false;
        if (sink.syncErrorThrown) {
          throw sink.syncErrorValue;

    return sink;
How to feed an rxjs observer

How to feed an rxjs observer

By : Khrailite Valence
Date : March 29 2020, 07:55 AM
I wish this help you everyone seems to find observers easy but i find them extremely difficult. I need to create an observable then feed a number to it when a button is pressed, in all the examples that i found they define the content of the observable in the constructor but i need to feed it after is created. Is this even possible?
code :
const { Subject, fromEvent } = rxjs;

const number$ = new Subject();

fromEvent(document.getElementById('button'), 'click').subscribe(() => {
  number$.next(Math.random() * 10);

number$.subscribe(number => {
  document.getElementById('output').innerText = number;
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.3.3/rxjs.umd.min.js"></script>
<button id="button">Click for random number</button>
<div id="output"></div>
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