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'Selection' is not defined react/jsx-no-undef

By : Success Bui
Date : September 14 2020, 08:00 PM
fixed the issue. Will look into that further You have your Selection import commented out, so the error is exactly what it says, Selection is not defined
code :

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Getting error 'TableData' is not defined react/jsx-no-undef in react js

By : user2649465
Date : March 29 2020, 07:55 AM
it helps some times I am new in react js, i have 2 files, App.js and Table.js, I have included Table.js file in App.js and when i used , it gives me error, Line 12: 'TableData' is not defined react/jsx-no-undef, here i have added my whole code for that, can anyone please help me why it is giving me that error, , You need to define TableData when importing.
code :
import TableData from './Table.js'

'ButtonToolbar' is not defined react/jsx-no-undef

By : user3066864
Date : March 29 2020, 07:55 AM
Any of those help You need to import ButtonToolbar,
code :
import {ButtonToolbar} from 'react-bootstrap';

I'm new to react, tried creating first app, 'Square' is not defined react/jsx-no-undef throws this error

By : user3067930
Date : March 29 2020, 07:55 AM
like below fixes the issue So the issue is here: If you are going to use the Square component, you need to create a class and then import it in main.js.
So you might have something like this:
code :
// src/square.js
import React, { Component } from 'react';
export default class Square extends Component {
  render() {
    return <div>Square</div>;
// src/main.js
import React from "react";
import ReactDOM from "react-dom";
import "./index.css";
import App from "./App";
import * as serviceWorker from "./serviceWorker";
import Square from './square';

ReactDOM.render(<App />, document.getElementById("root"));

class Board extends React.Component {

    renderSquare() {
      return <Square />;
    render() {
      return this.renderSquare();


How do I fix React ' is not defined no-undef'?

By : Sonu
Date : March 29 2020, 07:55 AM
will help you You're referring to a variable that's outside the scope in the method movieClicked. Change it to:
code :
const movieClicked = (movie) => {
import React from 'react';

function MovieList(props) {
    return (
            {props.movies.map(movie => {
                return (
                    <h3 key={movie.id} onClick={() => props.movieClicked(movie)}>

export default MovieList;

Getting 'Namebox' is not defined react/jsx-no-undef error when trying to render a react Component

By : user3460200
Date : March 29 2020, 07:55 AM
I wish this helpful for you namebox is a function not a component. You are trying to invoke it inside the sayHello function as a component. Try this.namebox(name) instead. You are not suppose to create a component within a component so namebox is just a function and it should start with a lower case letter.
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