Install Bootstrap for Angular 6

                                    Install Bootstrap for Angular 6

We will be using Bootstrap for styling. Install bootstrap using the following NPM command
npm install bootstrap@3 jquery --save

This installs Bootstrap in the node_modules folder. If you do not find the bootstrap folder in node_modules folder, restart visual studio code and you will find it. You can also execute the following command in the integrated terminal window and search for bootstrap folder.
dir node_modules 

In Angular CLI configuration file include the path to the Bootstrap CSS file in the styles array. Remember in Angular 6, the Angular CLI configuration file is renamed to angular.json from angular-cli.json. 

"styles": [

  "src/styles.css",

  "node_modules/bootstrap/dist/css/bootstrap.min.css"

]

Bootstrap relies on jQuery for some of it's features. If you plan on using those features, please include the path to jQuery and Bootstrap jQuery files in the scripts array in angular.json file. 

"scripts": [

  "node_modules/jquery/dist/jquery.min.js",

  "node_modules/bootstrap/dist/js/bootstrap.min.js"

]

To verify that you have the correct paths specified, you can request the respective files by running the angular project and pointing your browser to http://localhost:4200/node_modules/bootstrap/dist/css/bootstrap.min.css 

A quick additional test to verify, Bootstrap styles work as expected, include the following button in the root component (app.component.html) file. 

<button class="btn btn-primary">

    Bootstrap Styled Button

</button>