Angular

Building a Notification System in Angular Using RxJS

Introduction

Users experience enhanced interfaces with Angular systems since they receive immediate event feedback through active notifications. The upcoming blog post will demonstrate how to construct a fundamental Angular notification solution through RxJS application.

Create a Notification Service

Notifications will be controlled by RxJS Subject.

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Injectable({ providedIn: 'root' })
export class NotificationService {
private notificationSubject = new BehaviorSubject<string | null>(null);
notifications$ = this.notificationSubject.asObservable();
showNotification(message: string) {
this.notificationSubject.next(message);
setTimeout(() => this.notificationSubject.next(null), 3000); // Auto-hide after 3s
}
}

Create a Notification Component

This subscription will enable the component to show messages from notifications$.

import { Component } from '@angular/core';
import { NotificationService } from '../services/notification.service';
@Component({
selector: 'app-notification',
template: `
<div *ngIf="notification" class="notification">{{ notification }}</div>
`,
styles: [
`.notification {
position: fixed; top: 10px; right: 10px;
background: #333; color: #fff; padding: 10px; border-radius: 5px;
}`
]
})
export class NotificationComponent {
notification: string | null = null;
constructor(private notificationService: NotificationService) {
this.notificationService.notifications$.subscribe(message => {
this.notification = message;
});
}
}

Use the Notification System

The system requires an instance of NotificationService at locations such as button clicks.

import { Component } from '@angular/core';
import { NotificationService } from '../services/notification.service';
@Component({
selector: 'app-home',
template: `<button (click)="sendNotification()">Show Notification</button>`
})
export class HomeComponent {
constructor(private notificationService: NotificationService) {}
sendNotification() {
this.notificationService.showNotification('Hello, this is a notification!');
}
}

Conclusion

The Angular application utilizes RxJS BehaviorSubject to develop a basic reactive notification system. The application benefits from this method by providing a smooth and expandable solution for handling notifications throughout its system.

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