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Angular Progressive Web Application (PWA)

Application example built with Angular 14 and adding the Progressive Web Application (PWA) using the @angular/pwa library.

This tutorial was posted on my blog in portuguese and on the DEV Community in english.

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Prerequisites

Before you start, you need to install and configure the tools:

Getting started

Create the Angular application

1. Let's create the application with the Angular base structure using the @angular/cli with the route file and the SCSS style format.

ng new angular-pwa --routing true --style scss
CREATE angular-pwa/README.md (1056 bytes)
CREATE angular-pwa/.editorconfig (274 bytes)
CREATE angular-pwa/.gitignore (620 bytes)
CREATE angular-pwa/angular.json (3237 bytes)
CREATE angular-pwa/package.json (1075 bytes)
CREATE angular-pwa/tsconfig.json (863 bytes)
CREATE angular-pwa/.browserslistrc (600 bytes)
CREATE angular-pwa/karma.conf.js (1428 bytes)
CREATE angular-pwa/tsconfig.app.json (287 bytes)
CREATE angular-pwa/tsconfig.spec.json (333 bytes)
CREATE angular-pwa/.vscode/extensions.json (130 bytes)
CREATE angular-pwa/.vscode/launch.json (474 bytes)
CREATE angular-pwa/.vscode/tasks.json (938 bytes)
CREATE angular-pwa/src/favicon.ico (948 bytes)
CREATE angular-pwa/src/index.html (296 bytes)
CREATE angular-pwa/src/main.ts (372 bytes)
CREATE angular-pwa/src/polyfills.ts (2338 bytes)
CREATE angular-pwa/src/styles.scss (80 bytes)
CREATE angular-pwa/src/test.ts (745 bytes)
CREATE angular-pwa/src/assets/.gitkeep (0 bytes)
CREATE angular-pwa/src/environments/environment.prod.ts (51 bytes)
CREATE angular-pwa/src/environments/environment.ts (658 bytes)
CREATE angular-pwa/src/app/app-routing.module.ts (245 bytes)
CREATE angular-pwa/src/app/app.module.ts (393 bytes)
CREATE angular-pwa/src/app/app.component.scss (0 bytes)
CREATE angular-pwa/src/app/app.component.html (23364 bytes)
CREATE angular-pwa/src/app/app.component.spec.ts (1088 bytes)
CREATE angular-pwa/src/app/app.component.ts (216 bytes)
✔ Packages installed successfully.
    Successfully initialized git.

2. Install and configure the Bootstrap CSS framework. Do steps 2 and 3 of the post Adding the Bootstrap CSS framework to an Angular application.

3. Add the @angular/pwd library to set up the Angular service worker.

ng add @angular/pwa
ℹ Using package manager: npm
✔ Found compatible package version: @angular/pwa@13.1.2.
✔ Package information loaded.

The package @angular/pwa@13.1.2 will be installed and executed.
Would you like to proceed? Yes
✔ Package successfully installed.
CREATE ngsw-config.json (631 bytes)
CREATE src/manifest.webmanifest (1346 bytes)
CREATE src/assets/icons/icon-128x128.png (1253 bytes)
CREATE src/assets/icons/icon-144x144.png (1394 bytes)
CREATE src/assets/icons/icon-152x152.png (1427 bytes)
CREATE src/assets/icons/icon-192x192.png (1790 bytes)
CREATE src/assets/icons/icon-384x384.png (3557 bytes)
CREATE src/assets/icons/icon-512x512.png (5008 bytes)
CREATE src/assets/icons/icon-72x72.png (792 bytes)
CREATE src/assets/icons/icon-96x96.png (958 bytes)
UPDATE angular.json (3621 bytes)
UPDATE package.json (1615 bytes)
UPDATE src/app/app.module.ts (804 bytes)
UPDATE src/index.html (509 bytes)
✔ Packages installed successfully.

Note:

The files ngsw-config.json, src/manifest.webmanifest and icons were added and the files angular.json, package.json, src/app/app.module.ts and src/index.html were changed to the application.

  • ngsw-config.json: Service worker configuration file allows you to configure cache strategy and files and other configurations.
  • src/manifest.webmanifest: Application configuration file or WEB app manifest file allows you to configure the name, colors, icons and other configurations.
  • angular.json: The service worker configuration was added.
  • package.json: The @angular/service-worker library was added.
  • src/app/app.module.ts: The service worker configuration was added.
  • src/index.html: Manifest file configuration and theme color was added.

4. Remove the contents of the AppComponent class from the src/app/app.component.ts file. Create the updateOnlineStatus method to check the browser connection status as below.

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
})
export class AppComponent implements OnInit {

  isOnline: boolean;

  constructor() {
    this.isOnline = false;
  }

  public ngOnInit(): void {
    this.updateOnlineStatus();

    window.addEventListener('online',  this.updateOnlineStatus.bind(this));
    window.addEventListener('offline', this.updateOnlineStatus.bind(this));
  }

  private updateOnlineStatus(): void {
    this.isOnline = window.navigator.onLine;
    console.info(`isOnline=[${this.isOnline}]`);
  }

}

5. Remove the contents of the src/app/app.component.html file. Add the HTML code to display the browser connection status as below.

<div class="container-fluid py-3">
  <h1>Angular Progressive Web Application (PWA)</h1>

  <div class="row my-5">
    <div class="col text-end">
      Status:
    </div>
    <div class="col">
      <span class="badge bg-success" *ngIf="isOnline">Online</span>
      <span class="badge bg-danger" *ngIf="!isOnline">Offline</span>
    </div>
  </div>
</div>

6. Run the application with the command below.

npm start

> angular-pwa@1.0.0 start
> ng serve

✔ Browser application bundle generation complete.

Initial Chunk Files   | Names         |  Raw Size
vendor.js             | vendor        |   2.05 MB | 
styles.css, styles.js | styles        | 486.85 kB | 
polyfills.js          | polyfills     | 339.20 kB | 
scripts.js            | scripts       |  76.33 kB | 
main.js               | main          |  10.71 kB | 
runtime.js            | runtime       |   6.86 kB | 

                      | Initial Total |   2.95 MB

Build at: 2022-01-01T17:33:35.241Z - Hash: 1e50e703667ef1c0 - Time: 3557ms

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **


✔ Compiled successfully.

7. Access the URL http://localhost:4200/ and check if the application is working.

Angular Progressive Web Application (PWA) - Browser connection status

8. Change the contents of the AppComponent class from the src/app/app.component.ts file. Import the SwUpdate service and create the updateVersion and closeVersion methods to check for available updates for the application as below.

import { Component, OnInit } from '@angular/core';
import { SwUpdate, VersionReadyEvent } from '@angular/service-worker';
import { filter, map } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
})
export class AppComponent implements OnInit {

  isOnline: boolean;
  modalVersion: boolean;

  constructor(private swUpdate: SwUpdate) {
    this.isOnline = false;
    this.modalVersion = false;
  }

  public ngOnInit(): void {
    this.updateOnlineStatus();

    window.addEventListener('online',  this.updateOnlineStatus.bind(this));
    window.addEventListener('offline', this.updateOnlineStatus.bind(this));

    if (this.swUpdate.isEnabled) {
      this.swUpdate.versionUpdates.pipe(
        filter((evt: any): evt is VersionReadyEvent => evt.type === 'VERSION_READY'),
        map((evt: any) => {
          console.info(`currentVersion=[${evt.currentVersion} | latestVersion=[${evt.latestVersion}]`);
          this.modalVersion = true;
        }),
      );
    }
  }

  private updateOnlineStatus(): void {
    this.isOnline = window.navigator.onLine;
    console.info(`isOnline=[${this.isOnline}]`);
  }

  public updateVersion(): void {
    this.modalVersion = false;
    window.location.reload();
  }

  public closeVersion(): void {
    this.modalVersion = false;
  }

}

9. Change the contents of the src/app/app.component.html file. Add the HTML code to display if there are updates available for the application as below.

<div class="container-fluid py-3">
  <h1>Angular Progressive Web Application (PWA)</h1>

  <div class="row my-5">
    <div class="col text-end">
      Status:
    </div>
    <div class="col">
      <span class="badge bg-success" *ngIf="isOnline">Online</span>
      <span class="badge bg-danger" *ngIf="!isOnline">Offline</span>
    </div>
  </div>
</div>

<div class="w-100 position-absolute top-0" *ngIf="modalVersion">
  <div class="alert alert-secondary m-2">
    <button type="button" class="btn-close position-absolute top-0 end-0 m-1" aria-label="Close" (click)="closeVersion()"></button>
    A new version of this app is available. <a href="" (click)="updateVersion()">Update now</a>
  </div>
</div>

10. Access the URL http://localhost:4200/ and check if the application is working.

Angular Progressive Web Application (PWA) - Available update

11. Install the @angular/cdk library.

npm install @angular/cdk

12. Change the contents of the AppComponent class from the src/app/app.component.ts file. Import the Platform service and create the loadModalPwa, addToHomeScreen and closePwa methods to check the operational system and the browser and display how to add the application as below.

import { Component, OnInit } from '@angular/core';
import { Platform } from '@angular/cdk/platform';
import { SwUpdate, VersionReadyEvent } from '@angular/service-worker';
import { filter, map } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
})
export class AppComponent implements OnInit {

  isOnline: boolean;
  modalVersion: boolean;
  modalPwaEvent: any;
  modalPwaPlatform: string|undefined;

  constructor(private platform: Platform,
              private swUpdate: SwUpdate) {
    this.isOnline = false;
    this.modalVersion = false;
  }

  public ngOnInit(): void {
    this.updateOnlineStatus();

    window.addEventListener('online',  this.updateOnlineStatus.bind(this));
    window.addEventListener('offline', this.updateOnlineStatus.bind(this));

    if (this.swUpdate.isEnabled) {
      this.swUpdate.versionUpdates.pipe(
        filter((evt: any): evt is VersionReadyEvent => evt.type === 'VERSION_READY'),
        map((evt: any) => {
          console.info(`currentVersion=[${evt.currentVersion} | latestVersion=[${evt.latestVersion}]`);
          this.modalVersion = true;
        }),
      );
    }

    this.loadModalPwa();
  }

  private updateOnlineStatus(): void {
    this.isOnline = window.navigator.onLine;
    console.info(`isOnline=[${this.isOnline}]`);
  }

  public updateVersion(): void {
    this.modalVersion = false;
    window.location.reload();
  }

  public closeVersion(): void {
    this.modalVersion = false;
  }

  private loadModalPwa(): void {
    if (this.platform.ANDROID) {
      window.addEventListener('beforeinstallprompt', (event: any) => {
        event.preventDefault();
        this.modalPwaEvent = event;
        this.modalPwaPlatform = 'ANDROID';
      });
    }

    if (this.platform.IOS && this.platform.SAFARI) {
      const isInStandaloneMode = ('standalone' in window.navigator) && ((<any>window.navigator)['standalone']);
      if (!isInStandaloneMode) {
        this.modalPwaPlatform = 'IOS';
      }
    }
  }

  public addToHomeScreen(): void {
    this.modalPwaEvent.prompt();
    this.modalPwaPlatform = undefined;
  }

  public closePwa(): void {
    this.modalPwaPlatform = undefined;
  }

}

13. Change the contents of the src/app/app.component.html file. Add the HTML code to display how to add the application as below.

<div class="container-fluid py-3">
  <h1>Angular Progressive Web Application (PWA)</h1>

  <div class="row my-5">
    <div class="col text-end">
      Status:
    </div>
    <div class="col">
      <span class="badge bg-success" *ngIf="isOnline">Online</span>
      <span class="badge bg-danger" *ngIf="!isOnline">Offline</span>
    </div>
  </div>
</div>

<div class="w-100 position-absolute top-0" *ngIf="modalVersion">
  <div class="alert alert-secondary m-2">
    <button type="button" class="btn-close position-absolute top-0 end-0 m-1" aria-label="Close" (click)="closeVersion()"></button>
    A new version of this app is available. <a href="" (click)="updateVersion()">Update now</a>
  </div>
</div>

<div class="w-100 position-absolute bottom-0" *ngIf="modalPwaPlatform === 'ANDROID' || modalPwaPlatform === 'IOS'">
  <div class="alert alert-secondary m-2">
    <button type="button" class="btn-close position-absolute top-0 end-0 m-1" aria-label="Close" (click)="closePwa()"></button>
    <!-- Android -->
    <div *ngIf="modalPwaPlatform === 'ANDROID'" (click)="addToHomeScreen()">
      Add this WEB app to home screen
    </div>
    <!-- iOS with Safari -->
    <div *ngIf="modalPwaPlatform === 'IOS'">
      To install this WEB app on your device, tap the "Menu" button
      <img src="https://res.cloudinary.com/rodrigokamada/image/upload/v1641089482/Blog/angular-pwa/safari_action_button_38x50.png" class="ios-menu m-0" />
      and then "Add to home screen" button
      <i class="bi bi-plus-square"></i>
    </div>
  </div>
</div>

14. Add the style in the src/app/app.component.scss file as below.

.ios-menu {
  width: 14px;
}

15. Ready! Access the URL http://localhost:4200/ and check if the application is working. See the application working on GitHub Pages and Stackblitz.

15.1. Android version.

Angular Progressive Web Application (PWA) - Android add application Angular Progressive Web Application (PWA) - Android confirm add application
Modal to add to home screen Confirmation to add to home screen

15.2. iOS version.

Angular Progressive Web Application (PWA) - iOS add application Angular Progressive Web Application (PWA) - iOS menu add application
Modal to add to home screen Menu to add to home screen

Cloning the application

1. Clone the repository.

git clone git@github.com:rodrigokamada/angular-validation.git

2. Install the dependencies.

npm ci

3. Run the application.

npm start