CODE EXAMPLE FOR JAVASCRIPT

form handling in react

function MyForm() {
  const handleSubmit = (event) => {
    event.preventDefault();

    const data = new FormData(event.currentTarget);
    const values = Object.fromEntries(data.entries());

    if (!Number(values.age)) {
      alert('Your age must be a number');
      return;
    }

    console.log('submitting', values);
  };

  return (
    <form onSubmit={handleSubmit}>
      <h1>Hi!</h1>

      <p>Enter your name:</p>
      <input type="text" name="username" />

      <p>Enter your age:</p>
      <input type="text" name="age" />

      <br /><br />
      <input type="submit" />
    </form>
  );
}