Angular v17 – 4 – Model Inputs

When working with Angular, one of the key concepts to understand is model inputs. Model inputs allow you to pass data from a parent component to a child component, enabling communication between different parts of your application. In this article, we will explore how model inputs work in Angular version 17.

Defining Model Inputs

To define a model input in Angular, you use the @Input() decorator in the child component. This decorator allows you to specify a property that can receive data from the parent component. For example, let’s say we have a child component called ChildComponent that needs to receive a user object from its parent component. We can define a model input in the ChildComponent class like this:

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

@Component({
  selector: 'app-child',
  template: `
    

      
Child Component
      
Name: {{ user.name }}
      
Email: {{ user.email }}
    
  `
})
export class ChildComponent {
  @Input() user: any;
}

In this example, the @Input() decorator allows the ChildComponent to receive a user object from its parent component. The user object can then be accessed in the child component’s template using interpolation.

Passing Data from the Parent Component

To pass data to a model input in the child component, you simply bind the property in the parent component’s template. For example, let’s say we have a parent component called ParentComponent that contains a user object. We can pass this user object to the ChildComponent like this:

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

@Component({
  selector: 'app-parent',
  template: `
    

      
Parent Component
      
    
  `
})
export class ParentComponent {
  user = {
    name: 'John Doe',
    email: 'john.doe@example.com'
  };
}

In this example, the user object in the ParentComponent is bound to the user model input in the ChildComponent using square brackets. This allows the user object to be passed from the parent component to the child component.

Conclusion

Model inputs are an essential feature of Angular that allow for communication between components in your application. By defining model inputs in your child components and passing data from the parent components, you can create dynamic and interactive experiences for your users. In Angular version 17, model inputs continue to be a powerful tool for building robust and scalable applications.