对于那些不想使用ref和OnChange事件重置状态的人，你可以只使用简单的OnSubmit句柄和循环FormData对象。

注意，你不能直接访问formData.entries()，因为它是一个可迭代对象，你必须循环遍历它。

这个例子使用了React Hooks:

const LoginPage = () => {
  const handleSubmit = (event) => {
    const formData = new FormData(event.currentTarget);
    event.preventDefault();
    for (let [key, value] of formData.entries()) {
      console.log(key, value);
    }
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input type="text" name="username" placeholder="Email" />
        <input type="password" name="password" placeholder="Password" />
        <button type="submit">Login</button>
      </form>
    </div>
  );
};

如果你使用的是TypeScript:

export const LoginPage: React.FC<{}> = () => {
  const handleSubmit: React.FormEventHandler<HTMLFormElement> = (event) => {
    const formData = new FormData(event.currentTarget);
    event.preventDefault();
    for (let [key, value] of formData.entries()) {
      console.log(key, value);
    }
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input type="text" name="username" placeholder="Email" />
        <input type="password" name="password" placeholder="Password" />
        <button type="submit">Login</button>
      </form>
    </div>
  );
};

如果你在项目中使用Redux，你可以考虑使用这个更高阶的组件https://github.com/erikras/redux-form。

下面是从表单中获取数据的最短方法，也是使用FormData避免id和ref的最佳方法

import React, { Component } from 'react'

class FormComponent extends Component {
  formSubmit = (event) => {
    event.preventDefault()
    var data = new FormData(event.target)
    let formObject = Object.fromEntries(data.entries())
    console.log(formObject)
  }
  render() {
    return (
      <div>
        <form onSubmit={this.formSubmit}>
          <label>Name</label>
          <input name="name" placeholder="name" />
          <label>Email</label>
          <input type="email" name="email" />
          <input type="submit" />
        </form>
      </div>
    )
  }
}
export default FormComponent

对付裁判的一个简单方法:

class UserInfo extends React.Component { constructor(props) { super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(e) { e.preventDefault(); const formData = {}; for (const field in this.refs) { formData[field] = this.refs[field].value; } console.log('-->', formData); } render() { return ( <div> <form onSubmit={this.handleSubmit}> <input ref="phone" className="phone" type='tel' name="phone"/> <input ref="email" className="email" type='tel' name="email"/> <input type="submit" value="Submit"/> </form> </div> ); } } export default UserInfo;

迈克尔·肖克的回答是:

class MyForm extends React.Component {
  constructor() {
    super();
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleSubmit(event) {
    event.preventDefault();
    const data = new FormData(event.target);

    console.log(data.get('email')); // reference by form input's `name` tag

    fetch('/api/form-submit-url', {
      method: 'POST',
      body: data,
    });
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label htmlFor="username">Enter username</label>
        <input id="username" name="username" type="text" />

        <label htmlFor="email">Enter your email</label>
        <input id="email" name="email" type="email" />

        <label htmlFor="birthdate">Enter your birth date</label>
        <input id="birthdate" name="birthdate" type="text" />

        <button>Send data!</button>
      </form>
    );
  }
}

参见这篇Medium文章:如何用Just React处理表单

此方法仅在按下提交按钮时获取表单数据。我觉得干净多了!

下面是我使用单个inputChangeHandler收集多个表单输入的方法

import React from "react";

const COLORS = ["red", "orange", "yellow", "purple", "green", "white", "black"];

export default function App() {

  const initialFormFields = {
    name: undefined,
    email: undefined,
    favourite_color: undefined
  };
  const [formInput, setFormInput] = React.useState(initialFormFields);

  function inputChangeHandler(event) {
    setFormInput(prevFormState => ({
      ...prevFormState,
      [event.target.name]: event.target.value
    }))
  };

  return (
    <div className="App">
      <form>
        <label>Name: <input name="name" type="text" value={formInput.name} onChange={inputChangeHandler}/></label>
        <label>Email: <input name="email" type="email" value={formInput.email} onChange={inputChangeHandler}/></label>
        <div>
          {COLORS.map(color => <label><input type="radio" name="favourite_color" value={color} key={color} onChange={inputChangeHandler}/> {color} </label>)}
        </div>
      </form>

      <div>
        Entered Name: {formInput.name}
        Entered Email: {formInput.email}
        Favourite Color: {formInput.favourite_color}
      </div>
    </div>
  );
}