IDBTransaction: objectStore() method
====================================

 The **`objectStore()`** method of the
 `IDBTransaction` interface returns an object store that has already been
 added to the scope of this transaction.

 Every call to this method on the same transaction object, with the same name, returns
 the same `IDBObjectStore` instance. If this method is called on a different
 transaction object, a different `IDBObjectStore` instance is returned.

**Note:** This feature is available in Web Workers

Syntax
------


```js
objectStore(name)
```

### Parameters

`name`

The name of the requested object store.

### Return value

An `IDBObjectStore` object for accessing an object store.

### Exceptions

`NotFoundError` `DOMException`

Thrown if the requested object store is not in this transaction's scope.

`InvalidStateError` `DOMException`

Thrown if the request was made on a source object that has been deleted or removed, or if the transaction has finished.

Examples
--------

 In the following code snippet, we open a read/write transaction on our database and add
 some data to an object store. Note also the functions attached to transaction event
 handlers to report on the outcome of the transaction opening in the event of success or
 failure. For a full working example, see our To-do Notifications app (View example live).


```js
const note = document.getElementById("notifications");

// an instance of a db object for us to store the IDB data in
let db;

// Let us open our database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);

DBOpenRequest.onsuccess = (event) => {
  note.innerHTML += "<li>Database initialized.</li>";

  // store the result of opening the database in the db variable.
  // This is used a lot below
  db = DBOpenRequest.result;

  // Run the addData() function to add the data to the database
  addData();
};

function addData() {
  // Create a new object ready for being inserted into the IDB
  const newItem = [
    {
      taskTitle: "Walk dog",
      hours: 19,
      minutes: 30,
      day: 24,
      month: "December",
      year: 2013,
      notified: "no",
    },
  ];

  // open a read/write db transaction, ready for adding the data
  const transaction = db.transaction(["toDoList"], "readwrite");

  // report on the success of opening the transaction
  transaction.oncomplete = (event) => {
    note.innerHTML +=
      "<li>Transaction completed: database modification finished.</li>";
  };

  transaction.onerror = (event) => {
    note.innerHTML +=
      "<li>Transaction not opened due to error. Duplicate items not allowed.</li>";
  };

  // create an object store on the transaction
  const objectStore = transaction.objectStore("toDoList");

  // add our newItem object to the object store
  const objectStoreRequest = objectStore.add(newItem[0]);

  objectStoreRequest.onsuccess = (event) => {
    // report the success of the request (this does not mean the item
    // has been stored successfully in the DB - for that you need transaction.onsuccess)
    note.innerHTML += "<li>Request successful.</li>";
  };
}
```

Specifications
--------------

| Specification |
| --- |
| Indexed Database API 3.0 # ref-for-dom-idbtransaction-objectstore① |

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* Using IndexedDB
* Starting transactions: `IDBDatabase`
* Using transactions: `IDBTransaction`
* Setting a range of keys: `IDBKeyRange`
* Retrieving and making changes to your data: `IDBObjectStore`
* Using cursors: `IDBCursor`
* Reference example: To-do Notifications (View the example live).