期限の確認

function addData(e) {
  e.preventDefault();

  if (
    !title.value ||
    !hours.value ||
    !minutes.value ||
    !day.value ||
    !month.value ||
    !year.value
  ) {
    note.appendChild(document.createElement("li")).textContent =
      "データが送信されませんでした。フォームが不完全です。";
    return;
  }
  // ...
}

function addData(e) {
  // ...
  const newItem = [
    {
      taskTitle: title.value,
      hours: hours.value,
      minutes: minutes.value,
      day: day.value,
      month: month.value,
      year: year.value,
      notified: "no",
    },
  ];

  // open a read/write db transaction, ready for adding the data
  const transaction = db.transaction(["toDoList"], "readwrite");

  // report on the success of opening the transaction
  transaction.oncomplete = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      "Transaction opened for task addition.";
  };

  transaction.onerror = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      "Transaction not opened due to error. Duplicate items not allowed.";
  };

  // create an object store on the transaction
  const objectStore = transaction.objectStore("toDoList");

  // add our newItem object to the object store
  const request = objectStore.add(newItem[0]);

  // ...
}

function addData(e) {
  // ...
  request.onsuccess = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      "新しいアイテムがデータベースに追加されました。";

    title.value = "";
    hours.value = null;
    minutes.value = null;
    day.value = "01";
    month.value = "January";
    year.value = 2020;
  };
  // update the display of data to show the newly added item, by running displayData() again.
  displayData();
}

function checkDeadlines() {
  const now = new Date();
  const minuteCheck = now.getMinutes();
  const hourCheck = now.getHours();
  const dayCheck = now.getDate();
  const monthCheck = now.getMonth();
  const yearCheck = now.getFullYear();
  // ...
}

function checkDeadlines() {
  // ...
  const objectStore = db
    .transaction(["toDoList"], "readwrite")
    .objectStore("toDoList");

  objectStore.openCursor().onsuccess = (event) => {
    const cursor = event.target.result;
    let monthNumber;

    if (!cursor) return;
    // ...
    cursor.continue();
  };
}

const { hours, minutes, day, month, year, notified, taskTitle } = cursor.value;
const monthNumber = MONTHS.indexOf(month);
if (monthNumber === -1) throw new Error("Incorrect month entered in database.");

let matched = parseInt(hours, 10) === hourCheck;
matched &&= parseInt(minutes, 10) === minuteCheck;
matched &&= parseInt(day, 10) === dayCheck;
matched &&= monthNumber === monthCheck;
matched &&= parseInt(year, 10) === yearCheck;
if (matched && notified === "no") {
  // If the numbers all do match, run the createNotification() function to create a system notification
  // but only if the permission is set
  if (Notification.permission === "granted") {
    createNotification(taskTitle);
  }
}

// now we need to update the value of notified to "yes" in this particular data object, so the
// notification won't be set off on it again

// first open up a transaction as usual
const objectStore = db
  .transaction(["toDoList"], "readwrite")
  .objectStore("toDoList");

// Get the to-do list object that has this title as its title
const objectStoreTitleRequest = objectStore.get(title);

objectStoreTitleRequest.onsuccess = () => {
  // Grab the data object returned as the result
  const data = objectStoreTitleRequest.result;

  // Update the notified value in the object to 'yes'
  data.notified = "yes";

  // Create another request that inserts the item back into the database
  const updateTitleRequest = objectStore.put(data);

  // When this new request succeeds, run the displayData() function again to update the display
  updateTitleRequest.onsuccess = () => {
    displayData();
  };
};

setInterval(checkDeadlines, 1000);