Adding the Bootstrap CSS framework to an Angular application
Tags: angular, bootstrap, tutorial, webdev
Published: 2021-06-28 00:41:46

# Introduction

[Angular](https://angular.io/) 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](https://getbootstrap.com/) 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:

* [git](https://git-scm.com/)
* [Node.js and npm](https://nodejs.org/)
* [Angular CLI](https://angular.io/cli)
* IDE (e.g. [Visual Studio Code](https://code.visualstudio.com/))



# 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.

```powershell
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.

```powershell
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.

```json
"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.

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

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

```typescript
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.

```typescript
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.

```html
<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.

```powershell
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](https://rodrigokamada.github.io/angular-bootstrap/) and [Stackblitz](https://stackblitz.com/edit/angular15-bootstrap).

![Angular Bootstrap](https://res.cloudinary.com/rodrigokamada/image/upload/v1636720395/Blog/angular-bootstrap/angular-bootstrap.png)



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

This tutorial was posted on my [blog](https://rodrigo.kamada.com.br/share/blog/adicionando-o-framework-de-css-bootstrap-em-uma-aplicacao-angular) in portuguese.