react get input value on submit code example

Example 1: react text input onchange

class NameForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {value: ''};
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {    this.setState({value: event.target.value});  }
  handleSubmit(event) {
    alert('A name was submitted: ' + this.state.value);
    event.preventDefault();
  }

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

Example 2: handle onchange react

import React, { Component } from 'react';

import './App.css';
import Header from './Header';

class App extends Component {

  constructor(props) {
    super(props);
   this.state = {name: "Michael"}

  }
   changeTitle = (e) =>{
      this.setState({name: e.target.value});
    }

  render() {
    return (
      <div className="App">
        <Header title={this.state.name}/>
        <p className="App-intro">
          Type here to change name.
        <input type="text" onChange={this.changeTitle}/>
        </p>
      </div>
    );
  }
}

export default App;

Example 3: input text react 2020

function LoginForm() {
  const [email, setEmail] = React.useState("");
  const [password, setPassword] = React.useState("");

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    api.login(email, password);
  }
  return (
    <form onSubmit={handleSubmit}>
      <div>
      <label htmlFor="email">Email</label>
      <input
        type="email"
        id="email"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
      />
      </div>
      <div>
      <label htmlFor="password">Password</label>
      <input
        type="password"
        id="password"
        value={password}
        onChange={(e) => setPassword(e.target.value)}
      />
      </div>
    </form>
  );
}