Introduction to Angular

Module 1: Introduction to Angular (1 Hour)

● Introduction to Angular (15 minutes)

○ What is Angular?

■ Angular is a platform for building client-side web applications. It provides tools and libraries to simplify the development process.

■ It is based on components, which are reusable building blocks, making it easier to manage and scale applications.

○ Key features:

■ Components: The fundamental building blocks of Angular applications.

■ Templates: HTML-based views that define the structure of the UI.

■ Data Binding: Automatically synchronizes data between the component and the template.

■ Routing: Enables navigation between different views.

■ Dependency Injection: A design pattern for managing dependencies.

■ TypeScript: A superset of JavaScript that provides static typing.

○ Setting up the development environment:

■ Install Node.js and npm (Node Package Manager).

■ Install the Angular CLI (Command Line Interface) globally.

■ Create a new Angular project.

■ Serve the application.

○ Example:

■ Install Angular CLI: npm install -g @angular/cli

■ Create a new project: ng new my-first-angular-app

■ Navigate to the project: cd my-first-angular-app

■ Run the application: ng serve --open

● Components and Templates (30 minutes)

○ Understanding components:

■ Components are independent, reusable parts of the UI. Each component manages a specific part of the application.

■ A component consists of:

■ A TypeScript class that defines the component's behavior and data.

■ An HTML template that defines the component's view.

■ Metadata (using the @Component decorator) that provides information about the component.

○ Component structure:

■ @Component decorator: Provides metadata, including the selector (how to use the component in a template), the template, and styles.

■ Component class: Contains properties (data) and methods (logic) for the component.

■ Template: The HTML that displays the component's data and defines its structure.

○ Creating and using components:

■ Use the Angular CLI to generate components.

■ Import and use components in other components or modules.

○ Template syntax:

■ Interpolation: Displaying data from the component in the template using {{

}}.

■ Property binding: Setting properties of HTML elements using [ ].

■ Event binding: Responding to user events using ( ).

○ Example:

■ Generate a component: ng generate component product-list

● Data Binding (15 minutes)

○ What is Data Binding?

■ Data binding is a core concept in Angular that allows you to connect the data in your component (TypeScript) to the elements in your template

(HTML). This creates a dynamic and interactive user experience.

○ Types of Data Binding

■ Interpolation: Used to display component data in the template. Data flows from the component to the view.

■ Property Binding: Used to set properties of HTML elements. Data flows from the component to the view.

■ Event Binding: Used to respond to user events (like clicks, input changes).

Data flows from the view to the component.

■ Two-Way Binding: Used to synchronize data between the component and the template. Changes in the view update the component, and changes in the component update the view.

○ Interpolation:

■ Displays data from the component's properties in the template using double curly braces {{ }}.

■ Example: <h1>{{ title }}</h1>

○ Property Binding:

■ Sets the value of an HTML element's property using square brackets [ ].

■ Example: <input type="text" [value]="name">

○ Event Binding:

■ Listens for events (like clicks, input changes) and calls a method in the component. Uses parentheses ( ).

■ Example: <button (click)="handleClick()">Click Me</button>

○ Two-Way Binding:

■ Combines property binding and event binding to keep the component's data and the template's input elements synchronized. Uses [(ngModel)].

Requires importing the FormsModule.

■ Example: <input type="text" [(ngModel)]="myInput"

○ Example:

data-binding.component.ts: