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ReactJS findDOMNode() Method

  • Last Updated : 26 May, 2021

React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us some in-built methods that we can override at particular stages in the life-cycle of the component. In class-based components, the FindDOMNode() method is used to return DOM of the given element.

Creating React Application And Installing Module:

  • Step 1: Create a React application using the following command.

    npx create-react-app foldername
  • Step 2: After creating your project folder i.e. foldername, move to it using the following command.

    cd foldername

Project Structure: It will look like the following.



Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js




import React from 'react';
import ReactDOM from 'react-dom';
  
// Defining our App Component
const App = () => {
  
  // Function to get element from findDOMNode()
  function find() {
    var node = document.getElementById("node");
    var a = ReactDOM.findDOMNode(node);
    console.log(a);
    a.style.color = 'green';
    a.style.fontSize = "x-large";
  }
  
  // Returning our JSX code
  return <>
    <div>
      <h1>GeeksforGeeks</h1>
      <div id='node'>DOM Node</div>
      <button onClick={find}>Click to find</button>
    </div>
  </>;
}
  
// Exporting your Default App Component
export default App

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

Reference:https://reactjs.org/docs/react-dom.html#finddomnode

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