IDBTransaction: complete-Ereignis

addEventListener("complete", (event) => { })
oncomplete = (event) => { }

// Open the database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);
DBOpenRequest.onupgradeneeded = (event) => {
 const db = event.target.result;
 db.onerror = () => {
 console.log("Error creating database");
 };
 // Create an objectStore for this database
 const 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;
 // open a read/write db transaction, ready for adding the data
 const transaction = db.transaction(["toDoList"], "readwrite");
 // add a listener for `complete`
 transaction.addEventListener("complete", (event) => {
 console.log("Transaction was completed");
 });
 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);
 objectStoreRequest.onsuccess = () => {
 // Issue a second request in the onsuccess handler,
 // so we can run this request after the first one completes,
 // while still reusing the same transaction
 const getAllRequest = objectStore.getAll();
 getAllRequest.onsuccess = () => {
 // No more requests, so the transaction completes after running this handler
 console.log(getAllRequest.result);
 };
 };
};

Help improve MDN