ngx-event-service v1.0.1

Get started

Install: npm i --save event-service

Install peer dependency: npm i --save-dev immutable npm i --save-dev immutable-rxjs

Event Service

Event service is a message bus used in publish/subscribe pattern for communication between services, components etc

EventService accepts keys of type EventKey.

Define keys

import {EventKey} from 'ngx-event-service';

export const MyKeys = {
  title: new EventKey<string>('title'),
  pageDisabled: new EventKey<boolean>('pageDisabled'),
  date: new EventKey<Date>('date'),
};

Usage

import { EventService } from 'ngx-event-service';

export class MyClass {
  constructor(private es: EventService) {

    // subscribe to events like to normal observables
    this.es.get(MyKeys.title).subscribe(v => this.updateTitle(v));

    // read BehaviorSubject value directly
    const disabled  = this.es.get(MyKeys.pageDisabled).value;

    // publish new value to the bus channel
    this.es.get(MyKeys.date).next(new Date());
}

Filtering undefined values

EvnetService BehaviorSubject contains undefined value by default. When undefined value is undesirable, filter out using rxjs operator filter:

this.es
  .get(MyKeys.title)
  .pipe(filter(x => !!x))
  .subscribe(v => this.updateTitle(v));