Passing Data into a Component | Rangle.io : Angular Training (2024)

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Passing Data into a Component | Rangle.io : Angular Training? ›

There are two ways to pass data into a component, with 'property binding' and 'event binding'. In Angular, data and event change detection happens top-down from parent to children. However for Angular events we can use the DOM event mental model where events flow bottom-up from child to parent.

Parent Component Binding

Firstly, we have to create a custom property to pass the data into a component. This can be done via input binding, which passes data from one component to another, generally from parent to child. This custom input binding is created by using the @Input() decorator.

Passing data from Child to Parent Component

For passing the data from the child component to the parent component, we have to create a callback function in the parent component and then pass the callback function to the child component as a prop. This callback function will retrieve the data from the child component.

To pass a parameter to a React component, we can use props. Props are passed from parent components to child components and can be any JavaScript value. To pass a parameter, simply assign the value to a prop in the parent component and access it in the child component.

@Input() and @Output() allow Angular to share data between the parent context and child directives or components. An @Input() property is writable while an @Output() property is observable.

To pass data from child to a parent component we use @Output() decorator. EventEmitter() class must be added to the @Output decorator to emit event and notify the parent of the change. A good example is when passing form input values from child to parent component.

In Angular, data sharing between unrelated components can be achieved using services and observables. Services act as intermediaries, while observables facilitate seamless communication, enabling efficient sharing of data across different parts of the application.

One of the main methods to pass state to another component in React is via props. Props are read-only data that are passed from a parent component to a child component. To pass state data as props, we need to define the state in the parent component and pass it to the child component as an attribute.

Pass data from parent to child component using @Input() decorator, which allows data to pass through templates and child to parent component using @Output() decorator with the help of Event Emitter. Create a new Angular project using the following NPM command: ng new componentSharing.

What is used to pass data to a component from outside? ›

Answer: D) props are used to pass data to components from outside.

In the dynamically created component, you can inject the `'dynamicData'` token to access the data: import { Component, Inject } from '@angular/core' @Component({ selector: 'app-dynamic-component', template: `...` }) export class DynamicComponent { constructor(@Inject('dynamicData') public dynamicData: any) {} };

In Angular, data sharing between unrelated components can be achieved using services and observables. Services act as intermediaries, while observables facilitate seamless communication, enabling efficient sharing of data across different parts of the application.