ReactJS isElement() Method
Last Updated :
31 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 isElement() method. The isElement() method returns true if an element is any react element.
Creating React Application And Installing Module:
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Step 1: Create a React application using the following command.
npx create-react-app foldername
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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' ;
import { isElement } from 'react-dom/test-utils' ;
const App = () => {
function func() {
var a = isElement(el);
console.log( "The Following is an element :" , a);
}
const el = <div>
<h1>element</h1>
</div>
return <>
<div>
<h1>GeeksforGeeks</h1>
<button onClick={func}>Click Here !!</button>
</div>;
</>;
}
export default App
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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.
App.js
import React from 'react' ;
import { isElement } from 'react-dom/test-utils' ;
const App = () => {
function func(){
var element = document.getElementById( 'id' )
var a = isElement(element);
console.log( "The Following is an element :" , a);
}
return <>
<div id= 'el' >
<h1>GeeksforGeeks</h1>
<button onClick={func}>Click Here !!</button>
</div>
</>;
}
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/test-utils.html#iselement
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