JSFiddle - React, Tailwind, and code Playground

by gentou

HTML

1 EURO = 
<input name="Kurs" type="text" size="4" id="course">PLN
<div id="board"></div>
<form>
  Nazwa transakcji:<br>
  <input type="text" name="firstname"><br>
  Ilosc:<br>
  <input type="text" name="lastname">
</form>

JavaScript

var ratio = document.getElementById("course");
var board = document.getElementById("board");
ratio.addEventListener("change",  function(){
	board.innerHTML = ratio.value;
});