型別ref不可分配給型別IntrinsicAttributes

我想為我的元素使用 ref，但出現錯誤，我不知道如何修復它。

Type '{ ref: RefObject<unknown>; letter: string; draggable: number; }' is not assignable to type 'IntrinsicAttributes & content'.
  Property 'ref' does not exist on type 'IntrinsicAttributes & content'. 

我在網上搜索了一段時間，但找不到任何對我的案例有幫助的資訊。

這是我的代碼：

Content.tsx
import React, { useRef, useState } from 'react';
import { Box } from './Box';

function Content() {
    const onSubmitAnswer = () => {
        console.log("da");
    };

    const test = React.createRef();
    
    return (
        <div>
            <Box {...{ letter: 'C', draggable: 1 }} ref={test}/>
            <Box {...{ letter: 'A', draggable: 0 }} />
            <Box {...{ letter: 'B', draggable: 0 }} />
            <Box {...{ letter: 'C', draggable: 0 }} />
            <Box {...{ letter: 'D', draggable: 0 }} />
            <button onClick={onSubmitAnswer}>Trimite!</button>
        </div>
    );
}

export default Content;

和 Box.tsx

import React from 'react';
import './Box.css';
import Draggable, { DraggableData, DraggableEvent } from 'react-draggable';

export type content = {
    letter: string,
    draggable: number
}



export function Box(props: content) {
    const el = React.createRef();

    if(props.draggable) {
        return (
            <Draggable>
            <div className="box box-drag">
                <span className="box-content">
                  {props.letter}
                </span>
              </div>
            </Draggable>
            );
    }
    return (
        <div className="box">
            <span className="box-content" ref={el => {console.log(el?.getBoundingClientRect());}}>
              {props.letter}
            </span>
          </div>
        );
}

我想我知道為什么會發生這種情況 - Box 是一個組件，當我將 ref 作為屬性傳遞時（就像我對 JSX 標簽所做的那樣），它的行為不一樣（它在道具中）。

有沒有辦法像在 JSX 元素上使用它們一樣在組件上使用 ref/className/name ？

//編輯：打字稿游樂場鏈接：

https://www.typescriptlang.org/play?ssl=1&ssc=1&pln=1&pc=7#code/JYWwDg9gTgLgBAJQKYEMDGMA0cDecCuAzksgGbZFIDKMKMScAvnKVBCHAORSoacDcAKFCRYXAHQB6AEIQAHuLSFCA4eGjwAIlBQBzXSgBGAGyTY82vQZNJNdFNkv6jpgKIA3JADt4zVuy4edBgAWgATHWcbVUEYAE8wBjQIH294AF5cQTgcuFMYeigALjhCGChgL11MbNyIqxckEq98EEMkKEFGQUFSfC8MYBS4WTkACjA2MEIS5NSfAEos3LhgUgmpwnF6qNMlnFqVnJ4YfCgvODHDo5WAHidrUwA a5uc27Dgdzg0YxRlAByKBASHSACJDPI4JC5OFImCXm8kXBboQwCgLr9-oQgSDwTCQnN6D4Ea9kSscJMINNxPlCt1yTdbpI0RjEYz3pJPu52eTmQ9GrzkQshCsGbkTmcLlckR8vj8-oDgaCIfJSRzUejMYqccr8fJCSliTB1RzcFSaXSOuK SytUKmVyvg7ciKuj0 gMYEMLgBhI1pMb7a5zMpwFJUfCGEDAGAAQS8hAA7h04Jkg2mnss3qGIKZaRBdGMwWEUGC3WKhCGUmH6GHMshgoogvQyLcMXEnkHRblrpLzpcye9uS6maNcOJJ3grcUuL7ONgdo8mnAAIxMZg8UjpHB1mDMSSjo63cc4SfiadIAodEqcOMLuBLxolAAMG7gh6Hx9P58v19nnDSA T42K 76fhqP5TnkV6FLe86LpEy5gYwB5HncUEXjB-63powFIc cBvqhH7obktyGPgBTDCkvrGMAaAANY7hGUYxvGiYplAjBPAAKhU7FIAAhMylHUV4R7MiO1xut0ghIHIojwGESCkCg DGPA-rzDA-BAA

uj5u.com熱心網友回復：

如果你想使用ref，你應該包裝Box成forwardRef：

import React, { useRef, useState } from 'react';
import './Box.css';
import Draggable, { DraggableData, DraggableEvent } from 'react-draggable';

type content = {
  letter: string,
  draggable: number
}

const Box = React.forwardRef<HTMLDivElement, content>((props, ref) => {
  if (props.draggable) {
    return (
      <Draggable>
        <div className="box box-drag">
          <span className="box-content">
            {props.letter}
          </span>
        </div>
      </Draggable>
    );
  }
  return (
    <div className="box">
      <span className="box-content">
        {props.letter}
      </span>
    </div>
  );
});



function Content() {
  const onSubmitAnswer = () => {
    console.log("da");
  };

  const test = React.createRef<HTMLDivElement>();

  return (
    <div>
      <Box {...{ letter: 'C', draggable: 1 }} ref={test} />
      <Box {...{ letter: 'A', draggable: 0 }} />
      <Box {...{ letter: 'B', draggable: 0 }} />
      <Box {...{ letter: 'C', draggable: 0 }} />
      <Box {...{ letter: 'D', draggable: 0 }} />
      <button onClick={onSubmitAnswer}>Trimite!</button>
    </div>
  );
}

export default Content;

操場

ref期望是 HTML 元素。這就是為什么我提供HTMLDivElement了const test = React.createRef<HTMLDivElement>();. 它應該是哪個 HTML 元素取決于您。

Box被forwardRef顯式泛型引數包裹：React.forwardRef<HTMLDivElement, content>

標籤：javascript 反应 打字稿

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