In a React application, the root node refers to the top-level DOM element where the React components are rendered. It serves as the entry point for your React application.
Typically, you’ll have an HTML file with a designated element in which you want to render your React components. This element is the root node. Here’s an example:
<!DOCTYPE html>
<html>
<head>
<title>My React App</title>
</head>
<body>
<div id="root"></div>
</body>
</html>In this example, the <div> element with the id of “root” is the root node. It serves as the target container for rendering React components.
To render your React components into the root node, you can use the ReactDOM.render() method. Here’s an example:
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
ReactDOM.render(<App />, document.getElementById('root'));In this code snippet, we’re rendering the App component into the root node using ReactDOM.render(). The App component will replace the contents of the <div id="root"></div> element with its own rendered output.
By specifying the root node as the second argument to ReactDOM.render(), React will take care of updating the DOM as needed when the component’s state or props change.