检查截止日期

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

  if (!title.value || !hours.value || !minutes.value || !day.value || !month.value || !year.value) {
    note.appendChild(document.createElement("li")).textContent = "Data not submitted — form incomplete.";
    return;
  }

   else {
    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]);

    request.onsuccess = (event) => {

      note.appendChild(document.createElement("li")).textContent = "New item added to database.";

      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();

  const objectStore = db.transaction(['toDoList'], "readwrite").objectStore('toDoList');

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

    if (cursor) {

switch (cursor.value.month) {
  case "January":
    monthNumber = 0;
    break;
  case "February":
    monthNumber = 1;
    break;

  // other lines removed from listing for brevity

  case "December":
    monthNumber = 11;
    break;
  default:
    alert("Incorrect month entered in database.");
}

if (
  Number(cursor.value.hours) === hourCheck &&
  Number(cursor.value.minutes) === minuteCheck &&
  Number(cursor.value.day) === dayCheck &&
  monthNumber === monthCheck &&
  cursor.value.year === yearCheck &&
  notified === "no"
) {
  // If the numbers all do match, run the createNotification()
  // function to create a system notification
  createNotification(cursor.value.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 request = objectStore.get(title);

    request.onsuccess = () => {
      // grab the data object returned as the result
      const data = request.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 requestUpdate = objectStore.put(data);

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

      cursor.continue();
    }
  }
}

setInterval(checkDeadlines, 1000);