React Form refactor

react form with controlled inputs.jsx

// Consider this as option A: binding to input fields and listening to their changes:

// in a react component
submit = (e) => {
  MyAjaxApi.post('url.com', {
    user_name: this.state.name 
  })
}

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

handleEmailChange = (e) => {
  this.setState({ email: e.target.value })
}

render() {
  return <div>
    <!-- these are *controlled* inputs! -->
    <input onChange={this.handleNameChange} value={this.state.name} />
    <input onChange={this.handleEmailChange} value={this.state.email} />
    <button onClick={this.submit}>submit</button>
  </div>
}

react form with FormData.jsx

// And option B: leveraging `FormData`

handleSubmit = (e) => {
  e.preventDefault()

  // Use our this.form ref we set in `<form>` below
  const form = this.form
  // Use the `FormData` API
  const data = new FormData(form)
  // Translate our `FormData` object to api-friendly json
  const jsonFormData = Object.fromEntries(data)
  //=> Output: { user_name: 'Matt', user_email: 'me@matt.com' }

  // Use whatever ajax method to post
  MyAjaxApi.post('url.com', jsonFormData)
}

render() {
  return <form onSubmit={this.handleSubmit} ref={(el) => (this.form = el)}>
    <!-- these are *uncontrolled* inputs! -->
    <input name="user_name" defaultValue={this.state.name} />
    <input name="user_email" defaultValue={this.state.email} />
    <button>submit</button>
  </form>
}