document.getElementById("orderForm").addEventListener("submit", function(e) {
  e.preventDefault();

  const curry = parseInt(this.curry.value);
  const cake = parseInt(this.cake.value);
  const spaghetti = parseInt(this.spaghetti.value);

  const order = { curry, cake, spaghetti };

  fetch("/order", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(order)
  })
  .then(res => res.json())
  .then(data => {
    document.getElementById("result").textContent = data.message;
  })
  .catch(err => {
    document.getElementById("result").textContent = "エラーが発生しました。";
  });
});