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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/IDBTransaction/abort_event below:

IDBTransaction: abort event - Web APIs

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The abort event is fired when an IndexedDB transaction is aborted.

This can happen for any of the following reasons:

• Bad requests, (E.g., trying to add the same key twice, or put the same index key when the key has a uniqueness constraint).
• An explicit abort() call.
• An uncaught exception in the request's success/error handler.
• An I/O error (an actual failure to write to disk, for example disk detached, or other OS/hardware failure).
• Quota exceeded.

This non-cancelable event bubbles to the associated IDBDatabase object.

Use the event name in methods like addEventListener(), or set an event handler property.

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

onabort = (event) => { }

A generic Event.

This event bubbles to IDBDatabase. The event.target property refers to the IDBTransaction object that bubbles up.

For more information, see Event bubbling.

This example opens a database (creating the database if it does not exist), then opens a transaction, adds a listener to the abort event, then aborts the transaction to trigger the 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 `abort`
  transaction.addEventListener("abort", () => {
    console.log("Transaction was aborted");
  });

  // abort the transaction
  transaction.abort();
};

The same example, but assigning the event handler to the onabort property:

// 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 `abort`
  transaction.onabort = (event) => {
    console.log("Transaction was aborted");
  };

  // abort the transaction
  transaction.abort();
};

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