# js.html.idb

.. |
Cursor | The `IDBCursor` interface of the IndexedDB API represents a cursor for traversing or iterating over multiple records in a database.
CursorDirection |
Database | Inherits from: EventTarget
Factory | In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. For a full working example, see our To-do Notifications app (view example live.)
Index | `IDBIndex` interface of the IndexedDB API provides asynchronous access to an index in a database. An index is a kind of object store for looking up records in another object store, called the referenced object store. You use this interface to retrieve data.
IndexParameters |
ObjectStore | This example shows a variety of different uses of object stores, from updating the data structure with `IDBObjectStore.createIndex` inside an `onupgradeneeded` function, to adding a new item to our object store with `IDBObjectStore.add`. For a full working example, see our To-do Notifications app (view example live.)
ObjectStoreParameters |
OpenDBOptions |
OpenDBRequest | No methods, but inherits methods from its parents `IDBRequest` and `EventTarget`.
Request | The request object does not initially contain any information about the result of the operation, but once information becomes available, an event is fired on the request, and the information becomes available through the properties of the `IDBRequest` instance.
RequestReadyState |
Transaction | Note that as of Firefox 40, IndexedDB transactions have relaxed durability guarantees to increase performance (see bug 1112702.) Previously in a `readwrite` transaction `IDBTransaction.oncomplete` was fired only when all data was guaranteed to have been flushed to disk. In Firefox 40+ the `complete` event is fired after the OS has been told to write the data but potentially before that data has actually been flushed to disk. The `complete` event may thus be delivered quicker than before, however, there exists a small chance that the entire transaction will be lost if the OS crashes or there is a loss of system power before the data is flushed to disk. Since such catastrophic events are rare most consumers should not need to concern themselves further.
TransactionMode |