How To Create Reusable Components in Angular

Angular is a popular JavaScript framework that is used for building single-page web applications. One of the key features of Angular is the ability to create reusable components, which can be used across different parts of the application. In this tutorial, we will learn how to create reusable components in Angular, and how to use input and output properties to communicate between components.

Creating Reusable Components

To create a reusable component in Angular, first we need to create a new component using the Angular CLI. Open a terminal and run the following command:

ng generate component my-component

This will create a new folder called “my-component” with all the necessary files for a new Angular component. Now, you can use this component in your Angular application by simply adding it to the template of another component using the following syntax:

Now, whenever you need to use this component in another part of your application, you can simply add this tag to the template, and the component will be rendered.

Using Input & Output Properties

Often, when working with reusable components, you may need to pass data into the component or receive data from the component. This can be achieved using input and output properties in Angular.

To pass data into a component, you can define an input property in the component class, and then use this property in the component’s template. For example:

import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-my-component',
  template: `
    
{{myData}}
  `
})
export class MyComponent {
  @Input() myData: string;
}

Now, when you use this component in another component’s template, you can pass data into the component like this:

To emit data from a component, you can define an output property in the component class, and then use the EventEmitter class to emit events. For example:

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'app-my-component',
  template: `
    Click me
  `
})
export class MyComponent {
  @Output() dataEmitted: EventEmitter = new EventEmitter();

  emitData() {
    this.dataEmitted.emit('Data emitted from my component');
  }
}

Now, in the parent component’s template, you can listen for this event and handle it accordingly:

In this article, we have learned how to create reusable components in Angular, and how to use input and output properties to communicate between components. By following these best practices, you can create a more modular and maintainable Angular application. Good luck!