reactjs - `forwardRef` 在 Next.js 中动态导入模块时出错

Question

我正在尝试在外部组件上使用 forwardRef，但 ref.current不是实际的 ref .不确定我是否遗漏了什么。
我正在做:

const Editor = dynamic(() => import("react-markdown-editor-lite"), {
  ssr: false
});

const ForwardedRefEditor = forwardRef((props, ref) => (
  <Editor {...props} ref={ref} />
));

-----

const editorRef = useRef(null);
<ForwardedRefEditor
  ref={editorRef}
  value={content}
  onChange={({ text }) => setContent(text)}
/>

全码: https://codesandbox.io/s/objective-benz-qh4ec?file=/pages/index.js:63-73
更多信息: https://github.com/vercel/next.js/issues/4957

Answer 1

您需要将组件包装在自定义组件中。
使用 forwardRef:
包裹您的 Editor成分:

import React from "react";
import Editor from "react-markdown-editor-lite";

export default function WrappedEditor({ editorRef, ...props }) {
  return <Editor {...props} ref={editorRef} />;
}

然后动态导入:

import dynamic from "next/dynamic";
import { useRef, useState, forwardRef } from "react";

const Editor = dynamic(() => import("../WrappedEditor"), {
  ssr: false
});

const ForwardRefEditor = forwardRef((props, ref) => 
  <Editor {...props} editorRef={ref}/>
)

export default function IndexPage() {
  const editorRef = useRef(null);
  const [content, setContent] = useState("");

  console.log("editorRef", editorRef.current);

  return (
    <ForwardRefEditor
      ref={editorRef}
      value={content}
      onChange={({ text }) => setContent(text)}
    />
  );
}

CodeSandbox
您也可以使用 custom prop approach不使用 forwardRef .
自定义 Prop
包裹您的 Editor组件与前面的示例完全相同:

import React from "react";
import Editor from "react-markdown-editor-lite";

export default function WrappedEditor({ editorRef, ...props }) {
  return <Editor {...props} ref={editorRef} />;
}

将自定义 ref 属性传递给 Editor成分:

import dynamic from "next/dynamic";
import { useRef, useState } from "react";

const Editor = dynamic(() => import("../WrappedEditor"), {
  ssr: false
});

export default function IndexPage() {
  const editorRef = useRef(null);
  const [content, setContent] = useState("");

  console.log("editorRef", editorRef.current);

  return (
    <Editor
      editorRef={editorRef}
      value={content}
      onChange={({ text }) => setContent(text)}
    />
  );
}

CodeSandbox