complete

// データベースを開く
const DBOpenRequest = window.indexedDB.open("toDoList", 4);
DBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;
  db.onerror = () => {
    console.log("データベース作成エラー");
  };
  // このデータベースの objectStore を作成
  var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });
  // define what data items the objectStore will contain
  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
};
DBOpenRequest.onsuccess = (event) => {
  const db = DBOpenRequest.result;
  // DB の読み書きトランザクションを開き、データを追加する準備をする
  const transaction = db.transaction(["toDoList"], "readwrite");
  // `complete` のためのリスナーを追加
  transaction.addEventListener("complete", (event) => {
    console.log("トランザクション完了");
  });
  const objectStore = transaction.objectStore("toDoList");
  const newItem = {
    taskTitle: "my task",
    hours: 10,
    minutes: 10,
    day: 10,
    month: "January",
    year: 2019,
  };
  const objectStoreRequest = objectStore.add(newItem);
};

// データベースを開く
const DBOpenRequest = window.indexedDB.open("toDoList", 4);
DBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;
  db.onerror = () => {
    console.log("データベース作成エラー");
  };
  // このデータベースの objectStore を作成
  var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });
  // objectStore がどのようなデータアイテムを含むかを定義
  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
};
DBOpenRequest.onsuccess = (event) => {
  const db = DBOpenRequest.result;
  // DB の読み書きトランザクションを開き、データを追加する準備ができる
  const transaction = db.transaction(["toDoList"], "readwrite");
  // `complete` のためのリスナーを追加
  transaction.oncomplete = (event) => {
    console.log("トランザクション完了");
  };
  const objectStore = transaction.objectStore("toDoList");
  const newItem = {
    taskTitle: "my task",
    hours: 10,
    minutes: 10,
    day: 10,
    month: "January",
    year: 2019,
  };
  const objectStoreRequest = objectStore.add(newItem);
};