Adding the Bootstrap CSS framework to an Angular application

Application example built with Angular 15 and adding the Bootstrap CSS framework using the bootstrap and @ng-bootstrap libraries.

Oct 26, 2021

Introduction

Angular is a development platform for building WEB, mobile and desktop applications using HTML, CSS and TypeScript (JavaScript). Currently, Angular is at version 15 and Google is the main maintainer of the project.

Bootstrap is an open source CSS framework with many components for building responsive WEB interfaces.

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-bootstrap
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? SCSS   [ https://sass-lang.com/documentation/syntax#scss                ]
CREATE angular-bootstrap/README.md (1062 bytes)
CREATE angular-bootstrap/.editorconfig (274 bytes)
CREATE angular-bootstrap/.gitignore (604 bytes)
CREATE angular-bootstrap/angular.json (3273 bytes)
CREATE angular-bootstrap/package.json (1079 bytes)
CREATE angular-bootstrap/tsconfig.json (783 bytes)
CREATE angular-bootstrap/.browserslistrc (703 bytes)
CREATE angular-bootstrap/karma.conf.js (1434 bytes)
CREATE angular-bootstrap/tsconfig.app.json (287 bytes)
CREATE angular-bootstrap/tsconfig.spec.json (333 bytes)
CREATE angular-bootstrap/src/favicon.ico (948 bytes)
CREATE angular-bootstrap/src/index.html (302 bytes)
CREATE angular-bootstrap/src/main.ts (372 bytes)
CREATE angular-bootstrap/src/polyfills.ts (2820 bytes)
CREATE angular-bootstrap/src/styles.scss (80 bytes)
CREATE angular-bootstrap/src/test.ts (743 bytes)
CREATE angular-bootstrap/src/assets/.gitkeep (0 bytes)
CREATE angular-bootstrap/src/environments/environment.prod.ts (51 bytes)
CREATE angular-bootstrap/src/environments/environment.ts (658 bytes)
CREATE angular-bootstrap/src/app/app-routing.module.ts (245 bytes)
CREATE angular-bootstrap/src/app/app.module.ts (393 bytes)
CREATE angular-bootstrap/src/app/app.component.scss (0 bytes)
CREATE angular-bootstrap/src/app/app.component.html (23809 bytes)
CREATE angular-bootstrap/src/app/app.component.spec.ts (1090 bytes)
CREATE angular-bootstrap/src/app/app.component.ts (222 bytes)
✔ Packages installed successfully.
    Successfully initialized git.

2. Install the bootstrap and bootstrap-icons libraries.

npm install bootstrap bootstrap-icons

3. Configure the bootstrap and bootstrap-icons libraries. Change the angular.json file and add the bootstrap.scss, bootstrap-icons.css and bootstrap.bundle.min.js files as below.

"styles": [
  "node_modules/bootstrap/scss/bootstrap.scss",
  "node_modules/bootstrap-icons/font/bootstrap-icons.css",
  "src/styles.scss"
],
"scripts": [
  "node_modules/bootstrap/dist/js/bootstrap.bundle.min.js"
]

4. Install the @ng-bootstrap/ng-bootstrap library.

npm install @ng-bootstrap/ng-bootstrap@next

5. Import the NgbModule module. Change the app.module.ts file and add the lines as below.

import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

imports: [
  BrowserModule,
  NgbModule,
  AppRoutingModule,
],

6. Remove the contents of the AppComponent class from the src/app/app.component.ts file. Import the NgbModal service and create the open method as below.

import { Component } from '@angular/core';
import { NgbModal } from '@ng-bootstrap/ng-bootstrap';

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

  constructor(private modalService: NgbModal) {
  }

  public open(modal: any): void {
    this.modalService.open(modal);
  }

}

7. Remove the contents of the src/app/app.component.html file. Add some components as below.

<nav class="navbar navbar-expand-sm navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">
      <h1>Angular Bootstrap</h1>
    </a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li><hr class="dropdown-divider"></li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
          </ul>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
        </li>
      </ul>
      <form class="d-flex">
        <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
        <button class="btn btn-outline-success" type="submit">Search</button>
      </form>
    </div>
  </div>
</nav>
<div class="container-fluid py-3">
  <div class="row my-3">
    <div class="col">
      <label for="exampleFormControlInput1" class="form-label">Email address</label>
      <input type="email" class="form-control form-control-sm" id="exampleFormControlInput1" placeholder="name@example.com">
    </div>
  </div>
  <div class="row my-3">
    <div class="col">
      <label for="exampleFormControlTextarea1" class="form-label">Example textarea</label>
      <textarea class="form-control form-control-sm" id="exampleFormControlTextarea1" rows="3"></textarea>
    </div>
  </div>
  <div class="row my-3">
    <div class="col">
      <div class="form-check form-switch">
        <input class="form-check-input" type="checkbox" id="flexSwitchCheckDefault">
        <label class="form-check-label" for="flexSwitchCheckDefault">Default switch checkbox input</label>
      </div>
    </div>
  </div>
  <div class="row my-3">
    <div class="col">
      <button class="btn btn-sm btn-outline-primary" (click)="open(demoModal)">Launch demo modal</button>
    </div>
  </div>
</div>

<ng-template #demoModal let-modal>
  <div class="modal-header">
    <h4 class="modal-title" id="modal-basic-title">Profile update</h4>
    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close" (click)="modal.dismiss('Cross click')"></button>
  </div>
  <div class="modal-body">
    <form>
      <div class="form-group">
        <label for="dateOfBirth">Date of birth</label>
        <div class="input-group">
          <input id="dateOfBirth" name="dateOfBirth" class="form-control" placeholder="yyyy-mm-dd" ngbDatepicker #dp="ngbDatepicker">
          <button type="button" class="btn btn-outline-secondary bi bi-calendar" (click)="dp.toggle()"></button>
        </div>
      </div>
    </form>
  </div>
  <div class="modal-footer">
    <button type="button" class="btn btn-outline-dark" (click)="modal.close('Save click')">Save</button>
  </div>
</ng-template>

8. Run the application with the command below.

npm start

> angular-bootstrap@1.0.0 start
> ng serve

✔ Browser application bundle generation complete.

Initial Chunk Files | Names         |      Size
vendor.js           | vendor        |   3.38 MB
styles.css          | styles        | 255.86 kB
polyfills.js        | polyfills     | 128.56 kB
scripts.js          | scripts       |  76.94 kB
main.js             | main          |  22.81 kB
runtime.js          | runtime       |   6.59 kB

                    | Initial Total |   3.86 MB

Build at: 2021-06-27T21:28:22.756Z - Hash: 122b9fa4d57b962e7bcc - Time: 21933ms

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


✔ Compiled successfully.

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

The application repository is available at https://github.com/rodrigokamada/angular-bootstrap.

This tutorial was posted on my blog in portuguese.

Rodrigo Kamada

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