I got an error for using React.useRef inside a react function component

Question

I am using React.useRef inside a react functional component, I am getting an error message before i was using it inside a class component and now i have changed it to a react functional component and I am still getting this error message below.

React Hook "React.useRef" is called in function "landingPage" which is neither a React function component or a custom React Hook function

Could you please explain why am i still getting this message after placing in a functional component. Here is my code

import React from "react";
import Modal from "./Modal";

function landingPage() {
  const modalRef = React.useRef();

  return (
    <div className="landingPage">
      <div className="container">
        <div className="landingPage__row">
          <div className="playvideo-wrapper">
            <div className="playvideo-text">See us in action</div>
            <div className="playvideo-button" onClick={openModal}>
              <p>Play Video</p>
            </div>
            <Modal ref={modalRef}>
              <iframe
                src="https://www.youtube.com/embed/SQ8CvT25_Dg?autoplay=1"
                frameborder="0"
                allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
                allowfullscreen
              ></iframe>
            </Modal>
          </div>
        </div>
      </div>
    </div>
  );
}

export default landingPage;

and here is my code in app.js

import React, { Component } from "react";
import LandingPage from "./LandingPage";

export default class App extends Component {
  render() {
    return (
      <div className="main">
        <LandingPage />
      </div>
    );
  }
}

I think you need to use forwardRef here on your Modal component. reactjs.org/docs/forwarding-refs.html — user7637140
– user7637140, Commented Mar 1, 2020 at 22:21

Jayce444 · Accepted Answer · 2020-03-01 22:19:13Z

25

React components MUST start with a capital letter. Change this:

function landingPage() {...

to this:

function LandingPage() {...

answered Mar 1, 2020 at 22:19

Jayce444

9,1234 gold badges35 silver badges47 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Jayce444 Over a year ago

Otherwise React thinks it's just a regular Javascript function, and hooks aren't allowed in those

Jayce444 Over a year ago

@CodeNinja no worries. If this resolves everything for you please mark it as the correct answer :)

Anurag Anand · Accepted Answer · 2023-01-02 17:08:04Z

1

I had the same problem, always remember that every React component MUST start with a Capital letter,

Rename your

function landingPage(){...} to function LandingPage(){...}.

The Reason behind this is that state changes are done in classes, and so these will refer your functions as Classes, and for classes, the first letter of the class should be in Capital Letter.

edited Jan 2, 2023 at 17:08

answered Jan 2, 2023 at 17:03

Anurag Anand

112 bronze badges

Collectives™ on Stack Overflow

I got an error for using React.useRef inside a react function component

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related