Как получить значение input в react?

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

import React, { useState } from "react";
import ReactDOM from "react-dom";

function Welcome() {
  const [message, setMessage] = useState("");

  const getMessage = () => {
    console.log(message);
  };

  return (
    <div>
      <p>Сообщение: {message}</p>
      <input
        type="text"
        value={message}
        placeholder="Введите сообщение"
        onChange={(e) => setMessage(e.target.value)}
      />
      <button onClick={getMessage}>Получить значение</button>
    </div>
  );
}

class App extends React.Component {
  render() {
    return <Welcome />;
  }
}

ReactDOM.render(<App />, document.getElementById("container"));

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

import React, { Component } from 'react';

class Form extends Component {
  constructor(props) {
    super(props);
    this.state = { inputValue: '' };
  }

  handleChange(event) {
    this.setState({ inputValue: event.target.value });
  }

  handleSubmit(event) {
    alert('Input value is: ' + this.state.inputValue);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit.bind(this)}>
        <label>
          Input value:
          <input type="text" value={this.state.inputValue} onChange={this.handleChange.bind(this)} />
        </label>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}