有几种方法可以做到这一点:

1)通过索引从数组的表单元素中获取值

handleSubmit = (event) => {
  event.preventDefault();
  console.log(event.target[0].value)
}

2)在html中使用name属性

handleSubmit = (event) => {
  event.preventDefault();
  console.log(event.target.elements.username.value) // from elements property
  console.log(event.target.username.value)          // or directly
}

<input type="text" name="username"/>

3)使用裁判

handleSubmit = (event) => {
  console.log(this.inputNode.value)
}

<input type="text" name="username" ref={node => (this.inputNode = node)}/>

完整的示例

class NameForm extends React.Component {
  handleSubmit = (event) => {
    event.preventDefault()
    console.log(event.target[0].value)
    console.log(event.target.elements.username.value)
    console.log(event.target.username.value)
    console.log(this.inputNode.value)
  }
  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Name:
          <input
            type="text"
            name="username"
            ref={node => (this.inputNode = node)}
          />
        </label>
        <button type="submit">Submit</button>
      </form>
    )
  }
}

另一种方法是使用ref属性并使用this.refs引用值。这里有一个简单的例子:

render: function() {
    return (<form onSubmit={this.submitForm}>
        <input ref="theInput" />
    </form>);
},
submitForm: function(e) {
    e.preventDefault();
    alert(React.findDOMNode(this.refs.theInput).value);
}

更多信息可以在React文档中找到: https://facebook.github.io/react/docs/more-about-refs.html#the-ref-string-attribute

关于如何在React中使用单选按钮中描述的很多原因?这种方法并不总是最好的，但在一些简单的情况下确实是一种有用的替代方法。

这可能会帮助Meteor (v1.3)的用户:

render: function() {
    return (
        <form onSubmit={this.submitForm.bind(this)}>
            <input type="text" ref="email" placeholder="Email" />
            <input type="password" ref="password" placeholder="Password" />
            <button type="submit">Login</button>
        </form>
    );
},
submitForm: function(e) {
    e.preventDefault();
    console.log( this.refs.email.value );
    console.log( this.refs.password.value );
}

我知道这个问题很老了，但我想到的最简单的解决方法是:

<form onSubmit={(e) => handleLogin(e)}>
   <input type="text" name="email" placeholder="Email" />
   <input type="password" name="password" placeholder="Password" />
   <button type="submit">Login</button>
</form>

你的handle函数:

const handleLogin = (e) => {
 e.preventDefault()
 const data = {
  email: e.target.elements.email.value,
  password: e.target.elements.password.value
 }
 console.log('FormData: ', data)
}

当你点击登录按钮时，你会在控制台看到如下格式的FormData: FormData:{电子邮件:'无论你在这里提示'，密码:'也无论你在这里提示'}。

E.target.elements.email.value目标具有特定名称的元素，在这里是电子邮件和密码。

在console.log在handllogin之后，你可以做一些验证逻辑和登录逻辑。

这是一个动态添加字段的示例。在这里，表单数据将使用React useState钩子通过输入名称键存储。

import React, { useState } from 'react' function AuthForm({ firebase }) { const [formData, setFormData] = useState({}); // On Form Submit const onFormSubmit = (event) => { event.preventDefault(); console.log('data', formData) // Submit here }; // get Data const getData = (key) => { return formData.hasOwnProperty(key) ? formData[key] : ''; }; // Set data const setData = (key, value) => { return setFormData({ ...formData, [key]: value }); }; console.log('firebase', firebase) return ( <div className="wpcwv-authPage"> <form onSubmit={onFormSubmit} className="wpcwv-authForm"> <input name="name" type="text" className="wpcwv-input" placeholder="Your Name" value={getData('name')} onChange={(e) => setData('name', e.target.value)} /> <input name="email" type="email" className="wpcwv-input" placeholder="Your Email" value={getData('email')} onChange={(e) => setData('email', e.target.value)} /> <button type="submit" className="wpcwv-button wpcwv-buttonPrimary">Submit</button> </form> </div> ) } export default AuthForm

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>
  );
}