如何使用反应钩子将数据从子组件传递到父组件 [英] How to pass data from child to parent component using react hooks

问题描述

我有一个父组件和几个子组件.我需要根据 ErrorComponent 禁用或启用父级中的按钮.如果出现错误，则禁用该按钮或启用它.我相信我们可以将回调从孩子传递给父母，让父母知道并更新按钮属性.我需要知道如何使用 React 钩子做同样的事情?我尝试了几个例子，但徒劳无功.错误组件上没有事件.如果出现错误 (props.errorMessage)，那么我需要将一些数据传递给父级，以便我可以禁用该按钮.非常感谢任何帮助

I have a Parent component and couple of child components. I need to disable or enable the button in the parent based on the ErrorComponent. If there is an error then I disable the button or else I enable it. I believe we can pass callbacks from the child to parent and let the parent know and update the button property. I need to know how to do the same using react hooks? I tried few examples but in vain. There is no event on error component. If there is an error (props.errorMessage) then I need to pass some data to parent so that I can disable the button. Any help is highly appreciated

export const Parent: React.FC<Props> = (props) => {
....
const createContent = (): JSX.Element => {
  return (
    {<ErrorPanel message={props.errorMessage}/>}
    <AnotherComponent/>
  );
}
return (
<Button onClick={onSubmit} disabled={}>My Button</Button>
{createContent()}
);
};
export const ErrorPanel: React.FC<Props> = (props) => {
  if (props.message) {
    return (
        <div>{props.message}</div>
    );
  }
  return null;
};

推荐答案

在这种情况下，我会使用 useEffect 钩子，根据 disabled 状态设置 disabled代码>消息道具.您可以在此处查看整个工作应用程序:codesandbox

I'd use useEffect hook in this case, to set the disabled state depending on the message props. You can see the whole working app here: codesandbox

ErrorPanel 组件将如下所示:

import React, { useEffect } from "react";

interface IPropTypes {
  setDisabled(disabled:boolean): void;
  message?: string;
}

const ErrorPanel = ({ setDisabled, message }: IPropTypes) => {

  useEffect(() => {
    if (message) {
      setDisabled(true);
    } else {
      setDisabled(false);
    }
  }, [message, setDisabled]);

  if (message) {
    return <div>Error: {message}</div>;
  }
  return null;
};

export default ErrorPanel;

因此，根据 message 道具，只要它存在"，我就会通过操作传递的 setDisabled 函数将 disabled 道具设置为 true通过道具.

So depending on the message prop, whenever it 'exists', I set the disabled prop to true by manipulating the setDisabled function passed by the prop.

为了实现这一点，Parent 组件看起来像这样:

And to make this work, Parent component looks like this:

import React, { MouseEvent, useState } from "react";

import ErrorPanel from "./ErrorPanel";

interface IPropTypes {
  errorMessage?: string;
}

const Parent = ({ errorMessage }: IPropTypes) => {
  const [disabled, setDisabled] = useState(false);

  const createContent = () => {
    return <ErrorPanel setDisabled={setDisabled} message={errorMessage} />;
  };

  const handleSubmit = (e: MouseEvent) => {
    e.preventDefault();
    alert("Submit");
  };

  return (
    <>
      <button onClick={handleSubmit} disabled={disabled}>
        My Button
      </button>
      <br />
      <br />
      {createContent()}
    </>
  );
};

export default Parent;

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