Finish porting rest of Rx-DOM

from https://github.com/Reactive-Extensions/RxJS-DOM/issues/105#issuecomment-173029716

Here’s what we’ve already ported from Rx-DOM:

• Observable.ajax, Observable.ajax.get, Observable.ajax.put, Observable.ajax.post, Observable.ajax.delete, Observable.ajax.getJSON
• Observable.webSocket
• Scheduler.asap
• Scheduler.animationFrame

Here’s what we’re missing:

• events
• ready
• jsonp
• fromEventSource
• fromReader
• geolocation
• fromMutationObserver
• worker
• fromEvent with useCapture. Either we should change our current fromEvent to accept a useCapture boolean, or add a fromDOMEvent method.

cc: @blesh @staltz @mattpodwysocki

[benlesh]

@IDSFN come on ! requests pull welcome are.

❤️ ❤️ ❤️

[jayphelps]

Someone asked how to do geolocation.currentPosition() in v5 on gitter, so I whipped this up quick…might help others who stumble upon this:

class CurrentPositionObservable extends Observable {
  constructor(options) {
    super();

    this.options = options;
  }

  _subscribe(observer) {
    window.navigator.geolocation.getCurrentPosition(
      data => {
        observer.next(data);
        observer.complete();
      },
      e => observer.error(e),
      this.options
    );
  }
}

const geolocation = {
  currentPosition: options => new CurrentPositionObservable(options)
};

// use it how you would in v4 rx-dom
geolocation.currentPosition()
  .subscribe(value => console.log(value);

Hopefully this also sheds some light on how easy it is to make custom Observables 😄