Angular - Utilizing the @ViewChild Decorator in Angular for Enhanced Component Interaction

Angular, a robust web application framework, offers developers a vast array of tools and features to boost productivity. One such feature is the @ViewChild decorator, which facilitates the access of child components, directives, or DOM elements within Angular components. In this article, we will explore the capabilities of @ViewChild and delve into its practical applications for interacting with child elements and components in your Angular applications.

Understanding @ViewChild:

The @ViewChild decorator enables developers to obtain references to child components, directives, or DOM elements residing within the template of a parent component. It grants access to properties and methods of the child component, facilitates interaction with the child directive, and allows direct manipulation of the DOM element.

Syntax: The syntax for implementing the @ViewChild decorator is as follows:

@ViewChild(selector, options) propertyName: Type;

1. The selector represents the CSS selector or component class used to identify the child element/component.
2. The options parameter is optional and allows for the specification of additional view query options.

Example 1: Accessing a Child Component

Let's consider a scenario where we have a parent component, ParentComponent, that includes a child component named ChildComponent. To access the child component from the parent component, we can utilize the @ViewChild decorator as illustrated below:

Angular - Understanding @Input and @Output Decorators

Angular is a widely-used framework for creating web applications, offering powerful features for component-based development. Two important decorators in Angular are '@Input' and '@Output'. These decorators facilitate communication between components. In this post, we'll explore these decorators and learn how to utilize them effectively.

@Input Decorator

The '@Input' decorator is employed to define an input property on a component, enabling the flow of data from a parent component to a child component. By utilizing '@Input', you can bind values to properties within a child component, allowing for dynamic data exchange.

To define an input property, simply add the '@Input()' decorator above the property declaration within the child component. Here's an example:

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

@Component({
  selector: 'child-component',
  template: `Child Component: {{ childProperty }}`
})
export class ChildComponent {
  @Input() childProperty: string;
}