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ReactJS checked Attribute

  • Last Updated : 25 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 this article, we will know how to use checked or defaultChecked attribute in checkbox input in React.js.

The checked attribute can be used with a checkbox or RadioButton 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 1: 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';
  
// Defining our App Component
const App = () => {
  
  // Returning our JSX code
  return <>
    <div>
      <h1>GeeksforGeeks</h1>
        Input: <input type='checkbox' checked={true} />
    </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:
 

Example 2: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

Javascript




import React from 'react';
  
// Defining our App Component
const App = () => {
  
  // Returning our JSX code
  return <>
    <div>
      <h1>GeeksforGeeks</h1>
        Input: <input type='radio' checked={true} />
    </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/dom-elements.html#checked




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