Draft.js - Unable to get data from the database. Cross-origin error

问题

I am trying to use Draft.js in the Blog app I am creating. It all seems fine when saving data to the database and getting it back, just I cannot seem to get createWithContent to work.

When I write the following, the data does get saved to the database as I am simply creating an empty editor which then is updated by the user and sent to the database after convertToRaw.

const postDetails = useSelector((state) => state.postDetails);
const { loading, post, error } = postDetails; 
const editorContent = EditorState.createEmpty();

const [editorState, setEditorState] = useState({ editorState: editorContent });

const handleEditorChange = (editorState) => { setEditorState({ editorState }) }

const submitHandler = (e) => {
    e.preventDefault();
    dispatch(
      updatePost({
        _id: id,
        title,
        image,
        images,
        paragraph: JSON.stringify(
          convertToRaw(editorState.editorState.getCurrentContent())
        ),
      })
    );
  };

<Editor
   editorState={editorState.editorState}
   onEditorStateChange={handleEditorChange}
 />

But when I use

EditorState.createWithContent(convertFromRaw(JSON.parse(post.paragraph)))

which is what I really want (the paragraph to be filled out with the post.paragrah coming from the database), I get the following error:

A cross-origin error was thrown. React doesn't have access to the actual error object in development.

I am taking care of cross-origin this way:

app.use((req, res, next) => {
  res.setHeader('Access-Control-Allow-Origin', '*'); 
  res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content, Accept, Content-Type, Authorization'); 
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS'); 
  next();
});

Also, when i console.log(post.paragraph) i do get my paragraph:

but what i noticed is that i also get 2 undefined before receiving my paragraph and this could be part of the issue.

To fix this i have tried both this:

const editorContent =   post ?
    EditorState.createWithContent(convertFromRaw(JSON.parse(post.paragraph))) : 
    EditorState.createEmpty();
    
    const [editorState, setEditorState] = useState({ editorState: editorContent });

and this:

const editorContent = await post.paragraph;
          if (post.paragraph) {
            res.send({ editorContent: EditorState.createWithContent(convertFromRaw(JSON.parse(post.paragraph))) });
          } else {
              res.send({ editorContent: EditorState.createEmpty()});
            }
            return editorContent;
          })
    
    
        const [editorState, setEditorState] = useState({ editorState: content });

I have done lots of research on the web but I didn't manage to come up with anything successfull. Hope you guys can help. Thanks in advance

来源：https://stackoverflow.com/questions/64850515/draft-js-unable-to-get-data-from-the-database-cross-origin-error