Jquery in React is not defined

Hi I just want to receive ajax request, but the problem is that jquery is not defined in React. React version is 14.0

Error message

 Uncaught ReferenceError: $ is not defined

I have two files :

index.js

import React from 'react'; 
import { render } from 'react-dom';
import App from './containers/App';  

const root = document.getElementById('root');  

render( 
  <App source='https://api.github.com/users/octocat/gists' />, 
  root
);

app.js

import React, { Component } from 'react';

export default class App extends Component {

	componentDidMount() {
		const { source } = this.props;

		console.log($); // throws error
	}

	render() {
		return (
			<h1>Hey there.</h1>
		);
	}
}

Try add jQuery to your project, like

npm i jquery --save

or if you use bower

bower i jquery --save

then

import $ from 'jquery'; 

> I just want to receive ajax request, but the problem is that jQuery is not defined in React.

Then don't use it. Use Fetch and have a look at https://stackoverflow.com/questions/41125933/fetch-polyfill-in-react-not-completely-working-in-ie-11 to see example of alternative ways to get it running

Something like this

const that = this; 
fetch('http://jsonplaceholder.typicode.com/posts') 
  .then(function(response) { return response.json(); }) 
  .then(function(myJson) { 
     that.setState({data: myJson}); // for example
  });

It happens mostly when JQuery is not installed in your project. Install JQuery in your project by following commands according to your package manager.

Yarn

yarn add jquery

npm

npm i jquery --save

After this just import $ in your project file. import $ from 'jquery'

Isn't easier than doing like :

1- Install jquery in your project:

yarn add jquery

2- Import jquery and start playing with DOM:

import $ from 'jquery';

Just a note: if you use arrow functions you don't need the const that = this part. It might look like this:

fetch('http://jsonplaceholder.typicode.com/posts') 
  .then((response) => { return response.json(); }) 
  .then((myJson) => { 
     this.setState({data: myJson}); // for example
});

Add "ref" to h1 tag :

<h1 ref="source">Hey there.</h1>

and
const { source } = this.props; change to const { source } = this.refs;