Saturday, July 20, 2024
AngularAngular 17NGRXrxjs

Implementing a Signals Store in an Angular application

Implementing a Signals Store in an Angular application

Implementing a Signals Store in an Angular application involves creating a centralized place to manage state and events, enhancing the predictability and maintainability of your app. Angular, by design, does not include a built-in solution for state management akin to Redux in React. However, Angular developers often rely on libraries like NgRx, Akita, or NgXS for these purposes. A “Signals Store” can be akin to using observables to manage state changes and propagate them throughout your application. Here’s a basic approach to creating a Signals Store using RxJS, which is already part of Angular’s ecosystem.

Step 1: Setting Up Angular Project

Ensure you have Angular CLI installed. If not, you can install it via npm:

npm install -g @angular/cli

Create a new Angular project:

ng new signals-store-app

Navigate to your project directory:

cd signals-store-app

Step 2: Creating a Signal Store Service

Generate a service to act as your store:

ng generate service store

Open the store.service.ts file and set up a simple signal store using RxJS’s BehaviorSubject and Observable:

import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';

  providedIn: 'root',
export class StoreService {
  private readonly _signals = new BehaviorSubject<any[]>([]);

  get signals$(): Observable<any[]> {
    return this._signals.asObservable();

  private get signals(): any[] {
    return this._signals.getValue();

  private set signals(val: any[]) {;

  addSignal(signal: any): void {
    this.signals = [

  removeSignal(id: number): void {
    this.signals = this.signals.filter(signal => !== id);

This service uses BehaviorSubject to keep a private state of signals, which are accessible via the signals$ observable. The addSignal and removeSignal methods modify the state, which automatically updates all subscribers.

Step 3: Using the Store in Components

Inject the StoreService in your components to use the store:

import { Component, OnInit } from '@angular/core';
import { StoreService } from './store.service';
import { Observable } from 'rxjs';

  selector: 'app-signal-list',
  template: `
      <li *ngFor="let signal of signals$ | async">
        {{ }} - {{ signal.value }}
export class SignalListComponent implements OnInit {
  signals$: Observable<any[]>;

  constructor(private storeService: StoreService) {}

  ngOnInit(): void {
    this.signals$ = this.storeService.signals$;

In this component, you subscribe to the signals$ observable from the StoreService and use the async pipe in the template to automatically subscribe and unsubscribe, rendering the signals list dynamically.

Step 4: Modifying Signals

You can modify signals by calling addSignal or removeSignal from any component or service that injects the StoreService:

this.storeService.addSignal({ id: 1, name: 'Signal 1', value: 'Value 1' });

This approach provides a simple, RxJS-based state management solution in Angular without relying on external libraries. It’s a basic implementation and can be extended with more complex state management features as needed, like selectors or effects for handling side-effects.

the authortherichpost
Hello to all. Welcome to Myself Ajay Malhotra and I am freelance full stack developer. I love coding. I know WordPress, Core php, Angularjs, Angular 14, Angular 15, Angular 16, Angular 17, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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