Angular is a popular open-source framework for building web applications. One of the key features of Angular 2 is its component-based architecture, which allows developers to create reusable and modular components for their applications.
In Angular 2, components are the building blocks of an application. They are created using the `@Component` decorator, which is part of the Angular core library. A component in Angular 2 is made up of three main parts: the template, the class, and the metadata.
The template is an HTML file that defines the structure of the component. It contains the markup and bindings that will be rendered in the browser. The class is a TypeScript class that defines the behavior and properties of the component. It contains the logic and data that the template will use.
The metadata is provided by the `@Component` decorator, which is used to define the component and its properties. This includes the selector, which is the custom HTML tag that represents the component, the template URL, which is the path to the HTML template file, and other properties such as styles, animations, and providers.
Here is an example of how a component is created in Angular 2:
“`html
Hello, {{name}}!
“`
“`typescript
// app.component.ts
import { Component } from ‘@angular/core’;
@Component({
selector: ‘app-root’,
templateUrl: ‘./app.component.html’,
})
export class AppComponent {
name: string = ‘Angular 2’;
}
“`
In this example, we have created a simple component that displays a greeting message using the `{{name}}` binding. The `@Component` decorator is used to define the component, with the selector set to `app-root` and the template URL set to `./app.component.html`. The class `AppComponent` contains the `name` property, which is used in the template to display the greeting message.
Once a component is created, it can be used in other components or in the root module of the application by adding its custom HTML tag to the template or using it as a directive.
Overall, creating components in Angular 2 is easy and intuitive, thanks to its component-based architecture and the `@Component` decorator. This allows developers to build modular and reusable components, leading to more maintainable and scalable applications.
