CodePen Preview not Showing Anything

I’m currently working on the Random Quote Generator project from freeCodeCamp and I’ve noticed that the preview isn’t working and I can’t seem to pass any tests. I imported the React and ReactDOM, but I’m not sure what else could be making this happening. Any idea on why?

Here is a link to my project:

i think the test script has to be first. when i swapped it to the first thing, it went to 3/12 passing.
*EDIT: so i went back and tested before making changes and it’s at 3/12 anyways. sorry, i misunderstood what you were asking.

Yeah, the preview window doesn’t display any preview of what I’m working on, and now I see “Uncaught ReferenceError: ReactDom is not defined”.

It is ReactDOM not ReactDom (DOM).

Edit: getRandomIndex is a function you need to call it ().


Thanks, this fixed my “Not Defined” error, but my preview window still won’t show anything.

Edit: After a refresh, the preview window is now showing content. Thanks!

1 Like

No problem, happy to help.

Just as an aside, I would suggest checking out CodeSandbox for React code. It also gives you an experience closer to a local development environment. And yes, you can submit projects created with CodeSandbox just as you can with Codepen.