在 reactjs 中从一个组件共享价值到另一个组件

Question

为此，我使用了“React Draft Wysiwyg”。 在下面的代码中，我想访问 desktop.js 文件中变量value editor.js 文件的value 。 我怎样才能做到这一点？

编辑器.js：

export default class TextEditor extends Component {
render(){
  return(){
        <textarea
          disabled
         value={draftToHtml(convertToRaw(editorState.getCurrentContent()))}
        ></textarea>
    
      
    );
  }
}

桌面.js：

export const Desktop = () => {

    return (
      
        <div className="splitScreen">
            <TextEditor/>

        </div>
}

Answer 1

首先，您需要将一个函数作为来自桌面组件的 TextEditor 中的道具传递。

像这样<TextEditor onChange={this.onChange}> 。

在桌面组件中声明一个方法如下

onChange = (value) => {
  console.log(value);
}

现在像这样在 onEditorStateChange 方法中的 TextEditor 组件中调用此方法

 onEditorStateChange = (editorState) => {
    this.setState({
      editorState,
    });
    this.props.onChange(draftToHtml(convertToRaw(editorState.getCurrentContent()));
  };

Answer 2

我建议在 desktop.js 中使用useState ，同时将textValue的状态和setState函数作为道具传递给TextEditor组件：

import React, { useState } from "react";

export const Desktop = () => {
  const [textValue, setTextValue] = useState("");

  return (
    <div className="splitScreen">
      <TextEditor textValue={textValue} setTextValue={setTextValue} />
    </div>
  );
};

然后使用TextEditor的两个道具：

import React, { Component } from "react";
import { Editor } from "react-draft-wysiwyg";
import { EditorState, convertToRaw } from "draft-js";
import "./editor.css";
import "react-draft-wysiwyg/dist/react-draft-wysiwyg.css";
import draftToHtml from "draftjs-to-html";

export default class TextEditor extends Component {
  state = {
    editorState: EditorState.createEmpty(),
  };

  onEditorStateChange = (editorState) => {
    this.setState({
      editorState,
    });
  };

  render() {
    const { editorState } = this.state;

    // here you set the textValue state for the parent component
    this.props.setTextValue(
      draftToHtml(convertToRaw(editorState.getCurrentContent()))
    );

    return (
      <div className="editor">
        <Editor
          editorState={editorState}
          toolbarClassName="toolbarClassName"
          wrapperClassName="wrapperClassName"
          editorClassName="editorClassName"
          onEditorStateChange={this.onEditorStateChange}
        />
        <textarea
          disabled
          text_value={this.props.textValue} // here you use the textValue state passed as prop from the parent component
        ></textarea>
      </div>
    );
  }
}