React Typescript 输入 onChange 事件类型?

React Typescript input onChange event type?

我正在尝试从输入元素中获取文本,将其设置为状态,然后将其呈现回输入框中。但是我认为我的事件类型是错误的?我在网上搜索并尝试实施许多解决方案,但 none 到目前为止都有效。感谢任何帮助。

我的组件:

import React, { ChangeEvent, ChangeEventHandler, useState } from "react";

export default function Unidirectionflow() {
  const [state4, setState4] = useState("");
  const [state5, setState5] = useState("");

  let handleChange4 = (e: React.FormEvent<HTMLInputElement>): void => {
    setState3((e.target as HTMLInputElement).value);
  };

  let handleChange5 = (event: ChangeEvent<HTMLInputElement>) => {
    setState5(event.currentTarget.value);
  };

  return (
    <main>
      <input type="text" value={state4} onChange={() => handleChange4} />
      <input type="text" value={state5} onChange={() => handleChange5} />
    </main>
  );
}


https://react-typescript-cheatsheet.netlify.app/docs/basic/getting-started/forms_and_events/

您在调用函数时忘记传递event

试试这个

onChange={(e) => handleChange(e)}

或者

onChange={handleChange}

代码沙箱 => https://codesandbox.io/s/dreamy-pateu-1mc6j?file=/src/App.tsx

你可以这样做

export default function Unidirectionflow() {
const [states, setStates] = useState({
state3:'',
state4:''
})

const handleChange = (
    e: React.ChangeEvent<HTMLTextAreaElement | HTMLInputElement>
  ) => {
    setStates({
      ...states,
      [e.target.name]: e.target.value.trim(),
    });
  };

  return (
    <main>
      <input type="text" name="state3" value={states.state3} onChange={handleChange} />
      <input type="text" name="state4" value={states.state4} onChange={handleChange} />
    </main>
  );
};


onChange={handleChange} 看看能不能帮到你!