What is ReactDOM.render() -#6 ReactJS

Pubblicato il: 30 aprile 2024
sul canale di: Everyday Be Coding

444

#ReactJS #ReactDOM #renderMethod #WebDevelopment #JavaScript #FrontendDevelopment #UIRendering #ReactRendering #VirtualDOM #ProgrammingTutorial #webdevtutorial

Introduction:
ReactDOM.render() is a method in ReactJS that is used to render React elements into the DOM (Document Object Model). It takes two arguments:

Syntax:
Element to Render: The first argument is typically a React element or a component. This element represents the UI that you want to render onto the DOM.
DOM Container: The second argument specifies the DOM node where you want to mount the rendered element. It is usually a reference to an existing DOM element, such as a div with a specific id.
Here's the syntax of ReactDOM.render():

JavaScript code:
ReactDOM.render(element, container);

Example:
JavaScript code:
import React from 'react';
import ReactDOM from 'react-dom';

const App = () = {
return h1 Hello, World! /h1;
}

ReactDOM.render(App /, document.getElementById('root'));
In this example, we have a simple React component called App that returns an h1 element with the text "Hello, World!". We use ReactDOM.render() to render this component into the DOM, specifically into the element with the id 'root'. The rendered output will be:

html
div id="root"
h1 Hello, World! /h1
/div

Summery:
ReactDOM.render() is typically called only once in a React application, usually in the entry point file (e.g., index.js), to render the root component of the application into the DOM. Subsequent updates to the UI are handled by React's reconciliation process, which efficiently updates only the components that have changed.

Chapter :
00:00 Introduction
00:17 Syntax
00:45 Example
01:41 Summery

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