Build a Reusable Mega Navbar - Step 1

JavaScript
1

Tell us what’s happening:

Showing error prior to entering code:
Warning: React.createElement: type is invalid – expected a string (for built-in components) or a class/function (for composite components) but got: %s.%s undefined You likely forgot to export your component from the file it’s defined in, or you might have mixed up default and named imports.

Your code so far

<!-- file: index.html -->
<!doctype html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Hello World</title>
    <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>

    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <script
      data-plugins="transform-modules-umd"
      type="text/babel"
      src="index.jsx"
    ></script>
     <link rel="stylesheet" href="./styles.css" />
  </head>
  <body>
    <div id="root"></div>
    <script
      data-plugins="transform-modules-umd"
      type="text/babel"
      data-presets="react"
      data-type="module"
    >
      import { Navbar } from './index.jsx';
      ReactDOM.createRoot(document.getElementById('root')).render(
        <Navbar />
      );
    </script>
  </body>
</html>

/* file: styles.css */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --white: #fff;
  --light-grey: #e1e0e0;
  --dark-purple: #7c0e7c;
  --black: #000;
}

body {
  background-color: var(--light-grey);
}

.navbar {
  background-color: var(--white);
}

.navbar ul {
  display: flex;
  justify-content: space-around;
}

.navbar ul li {
  list-style: none;
  border-radius: 4px;
}

.navbar ul li a {
  text-decoration: none;
  color: var(--black);
  padding: 10px;
  display: inline-block;
  width: 100%;
}

button {
  background: transparent;
  border: none;
  font-family: 'Times New Roman', Times, serif;
  padding: 10px;
  font-size: 1rem;
}

.navbar ul .nav-item a:hover {
  background-color: var(--dark-purple);
  color: var(--white);
}

button:hover {
  background-color: var(--dark-purple);
  color: var(--white);
}

.navbar ul .nav-item .sub-menu {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  right: 5%;
  transition: opacity 0.5s ease;
  display: block;
  background-color: var(--white);
}

@media (min-width: 768px) {
  .navbar ul .nav-item .sub-menu {
    right: 15%;
  }
}

@media (min-width: 1024px) {
  .navbar ul .nav-item .sub-menu {
    right: 13%;
  }
}

.navbar ul .nav-item:hover .sub-menu,
.navbar ul .nav-item:focus-within .sub-menu {
  visibility: visible;
  opacity: 1;
}

/* file: index.jsx */

{/* User Editable Region */}

export default function Navbar() {
  return (
    <>
      ()
    </>
  );
}



{/* User Editable Region */}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Challenge Information:

Build a Reusable Mega Navbar - Step 1

2

The issue is that you are exporting it as a default but in the import statement in the index.html file is using a named import

so you need to remove the default for the error message to go away

or you can also update the import statement to remove the curly braces for the error to go away too since you need to import the whole Navbar component

1 Like
3

Here is a video from the JS section talking about imports and exports :+1: