Mermaid plugin with "createElementNS" error on create-react-app

[jimkk159]

Hello, I would like to use mermaid as a plugin in my editor.

I copy all the sample code from mermaid codesandbox example in my new create-react-app. (Just copy all the code in index.js and replace all the new react app App.js code )

However, I always get the

The mermaid svg code always return the Promise

It seems like the mermaid can not find the id of the <code/> or something

My package version "@uiw/react-md-editor": "^3.23.0", "mermaid": "^10.2.0", "react": "^18.2.0", "react-dom": "^18.2.0",

Does I miss any steps for using mermaid? (I am not sure this is a mermaid, editor or the version conflict problem .)

[jaywcjlove]

@jimkk159 mermaid v10.0 The API has changed. The example uses the v8 version

https://codesandbox.io/embed/https-github-com-uiwjs-react-md-editor-issues-528-965r7j?fontsize=14&hidenavigation=1&theme=dark

import React, { useState, useRef, useEffect, useCallback } from "react";
import MDEditor from "@uiw/react-md-editor";
import mermaid from "mermaid";

const mdMermaid = `The following are some examples of the diagrams, charts and graphs that can be made using Mermaid and the Markdown-inspired text specific to it. 

\`\`\`mermaid
graph TD
A[Hard] -->|Text| B(Round)
B --> C{Decision}
C -->|One| D[Result 1]
C -->|Two| E[Result 2]
\`\`\`

\`\`\`mermaid
sequenceDiagram
Alice->>John: Hello John, how are you?
loop Healthcheck
    John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
\`\`\`
`;

const randomid = () => parseInt(String(Math.random() * 1e15), 10).toString(36);

const Code = ({ inline, children = [], className, ...props }) => {
  const demoid = useRef(`dome${randomid()}`);
  const code = getCode(children);
  const demo = useRef(null);
  const handleMermaid = useCallback(async () => {
    try {
      const { svg } = await mermaid.render(demoid.current, code);
      demo.current.innerHTML = svg;
    } catch (error) {
      demo.current.innerHTML = error;
    }
  }, [code, demoid]);
  useEffect(() => {
    if (demo.current) {
      handleMermaid();
    }
  }, [handleMermaid]);

  if (
    typeof code === "string" &&
    typeof className === "string" &&
    /^language-mermaid/.test(className.toLocaleLowerCase())
  ) {
    return (
      <code ref={demo}>
        <code id={demoid.current} style={{ display: "none" }} />
      </code>
    );
  }
  return <code className={String(className)}>{children}</code>;
};

const getCode = (arr = []) =>
  arr
    .map((dt) => {
      if (typeof dt === "string") {
        return dt;
      }
      if (dt.props && dt.props.children) {
        return getCode(dt.props.children);
      }
      return false;
    })
    .filter(Boolean)
    .join("");

export default function App() {
  const [value, setValue] = useState(mdMermaid);
  return (
    <React.Fragment>
      <div data-color-mode="dart">
        <MDEditor
          onChange={(newValue = "") => setValue(newValue)}
          textareaProps={{
            placeholder: "Please enter Markdown text"
          }}
          height={500}
          value={value}
          previewOptions={{
            components: {
              code: Code
            }
          }}
        />
      </div>

      <div data-color-mode="light">
        <MDEditor
          onChange={(newValue = "") => setValue(newValue)}
          textareaProps={{
            placeholder: "Please enter Markdown text"
          }}
          height={500}
          value={value}
          previewOptions={{
            components: {
              code: Code
            }
          }}
        />
      </div>
    </React.Fragment>
  );
}

[jaywcjlove]

// v8
- const str = mermaid.render(demoid.current, code, () => null, demo.current);
// v10
+ const { svg } = await mermaid.render('graphDiv', graphDefinition);

@jimkk159

[jimkk159]

Thanks a lot