supabase/examples/slack-clone-basic/components/MessageInput.js

import { useState } from 'react'

const MessageInput = ({onSubmit}) => {
  const [messageText, setMessageText] = useState('')
  
  const submitOnEnter = event => {
    // Watch for enter key
    if (event.keyCode === 13) {
      onSubmit(messageText)
      setMessageText('')
    }
  }
  
  return (
    <>
        <input
          className="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
          type="text"
          placeholder="Send a message"
          value={messageText}
          onChange={e => setMessageText(e.target.value)}
          onKeyDown={e => submitOnEnter(e)}
        />
    </>
  )}

export default MessageInput