why use react portals

Why should I use React portals?

React portals provide a first-class way to render and allow child components, which are typically present outside the DOM, to live within a Document Object Model (DOM) node. This React portal component exists outside the DOM hierarchy of the parent component.

Why do we need portals?

We mainly need portals when a React parent component has a hidden value of overflow property(overflow: hidden) or z-index style, and we need a child component to openly come out of the current tree hierarchy. Following are the examples when we need the react portals: Dialogs. Modals.

How do you use portals in React JS?

1. import React from ‘react’
2. import ReactDOM from ‘react-dom’
3. function PortalDemo(){
4. return ReactDOM.createPortal(
5. <h1>Portals Demo</h1>,
6. document.getElementById(‘portal-root’)
7. )
8. }

When using createPortal what is the second argument?

To give you a brief explanation, the createPortal() function takes two arguments. The first one is the child that will be rendered. In our case, that’s the Modal. The second argument is the container which represents the DOM element.

What is useRef in React?

The useRef Hook allows you to persist values between renders. It can be used to store a mutable value that does not cause a re-render when updated. It can be used to access a DOM element directly.

How do you create a React portal?

A React Portal can be created using the createPortal function imported from react-dom . It takes two arguments: content : any valid renderable React element. containerElement : a valid DOM element to which we can append the content.

What is Portal in JavaScript?

The HTML element enables the embedding of another HTML page into the current one for the purposes of allowing smoother navigation into new pages. A is similar to an