ReactJS - What is DOM in React?

The Document Object Model (DOM) is a hierarchical representation of an HTML or XML document. In ReactJS, the DOM is used to manage the state and render pages dynamically. In this article, we will learn what is the DOM in ReactJS, its syntax, examples, output, explanation, use, important points, and summary.

Syntax

The syntax of DOM in ReactJS is as follows:

ReactDOM.render(element, container[, callback])
ReactDOM.unmountComponentAtNode(container)

Example

Here is an example of ReactJS DOM:

import React from 'react';
import ReactDOM from 'react-dom';

class MyApp extends React.Component {
   render() {
      return (
         <div>
            <h1>Hello, world!</h1>
         </div>
      );
   }
}

ReactDOM.render(<MyApp />, document.getElementById('root'));

Output

The output of the above ReactJS DOM example will be a simple webpage that shows the message "Hello, world!".

Explanation

In the above example, we have used ReactDOM.render(), which is the most common method to mount a React component to the DOM. We have rendered the component MyApp, which contains a simple HTML code using JSX. The code inside the render method will create the virtual DOM, which tells React what elements to render on the page.

Use

The DOM is an essential part of ReactJS. ReactJS uses the DOM to update the user interface dynamically based on its current state. You can use the DOM to create interactive web applications, which provide a better user experience than the traditional static web applications.

Important Points

Here are some important points to keep in mind while using the DOM in ReactJS:

• The DOM is used to manage the state and render pages dynamically in ReactJS.
• In ReactJS, we create the virtual DOM, which tells React what elements to render on the page.
• ReactJS uses the ReactDOM class to interact with the DOM.
• The ReactDOM.render() method is used to mount a React component to the DOM.
• The DOM can be used to create interactive web applications in ReactJS.

Summary

In this article, we have learned about the Document Object Model (DOM) in ReactJS. We have learned its syntax, examples, output, explanation, use, important points, and summary. We hope that this article has helped you understand the DOM in ReactJS.