DemoApp

This project was generated with Angular CLI version 6.0.0.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.

Build

Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via Protractor.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI README.

Add package by npm

-> npm install --save bootstrap

Use --save to mark the package as a production dependency

-> A component is just a ts class -> Decorators are always precedeed with @ symbol. Ex. @Component -> We use decorator to add metadata(additional information) to a ts class. For example we use @Component to tell the angular that this type script class is an angular component.

templateUrl vs template

Important: For Two-Way-Binding to work, you need to enable the ngModel directive. This is done by adding the FormsModule to the imports[] array in the AppModule.You then also need to add the import from @angular/forms in the app.module.ts file:

import { FormsModule } from '@angular/forms'; 

*ngIf is a structural directive which add or remove element but attribute directive don't do this.

ngStyle allows us to change the css style but ngClass allows use to add or remove css class.