IDBTransaction: error-Ereignis

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨Juli 2015⁩.

Das error-Ereignis wird auf IDBTransaction ausgelöst, wenn eine Anfrage einen Fehler zurückgibt und das Ereignis bis zum Transaktionsobjekt hinaufblubbert.

Hinweis: Um alle Möglichkeiten zu behandeln, wie eine Transaktion fehlschlagen kann, sollten Sie stattdessen das abort-Ereignis beobachten.

Syntax

Verwenden Sie den Ereignisnamen in Methoden wie addEventListener() oder setzen Sie eine Ereignishandlereigenschaft.

addEventListener("error", (event) => { })

onerror = (event) => { }

// Open the database
const dBOpenRequest = window.indexedDB.open("toDoList", 4);

dBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  // 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");

  const objectStore = transaction.objectStore("toDoList");
  const newItem = {
    taskTitle: "my task",
    hours: 10,
    minutes: 10,
    day: 10,
    month: "January",
    year: 2020,
  };

  transaction.addEventListener("error", () => {
    console.log(`Error adding new item: ${newItem.taskTitle}`);
  });

  const objectStoreRequest = objectStore.add(newItem);
};

Dasselbe Beispiel mit der onerror-Eigenschaft anstelle von addEventListener():

// Open the database
const dBOpenRequest = window.indexedDB.open("toDoList", 4);

dBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  // 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");

  const objectStore = transaction.objectStore("toDoList");
  const newItem = {
    taskTitle: "my task",
    hours: 10,
    minutes: 10,
    day: 10,
    month: "January",
    year: 2020,
  };

  transaction.onerror = () => {
    console.log(`Error adding new item: ${newItem.taskTitle}`);
  };

  const objectStoreRequest = objectStore.add(newItem);
};