IDBFactory.open()

The open() method of the IDBFactory interface requests opening a connection to a database.

The method returns an IDBOpenDBRequest object immediately, and performs the open operation asynchronously. If the operation is successful, a success event is fired on the request object that is returned from this method, with its result attribute set to the new IDBDatabase object for the connection.

May trigger upgradeneeded, blocked or versionchange events.

Note: This feature is available in Web Workers

Syntax

open(name)
open(name, version)

Parameters

name: The name of the database.
version Optional: Optional. The version to open the database with. If the version is not provided and the database exists, then a connection to the database will be opened without changing its version. If the version is not provided and the database does not exist, then it will be created with version 1.

Experimental Gecko options object

options (version and storage) Optional Deprecated: In Gecko, since version 26, you can include a non-standard options object as a parameter of IDBFactory.open that contains the version number of the database, plus a storage value that specifies whether you want to use persistent or temporary storage.

Warning: The storage attribute is deprecated and will soon be removed from Gecko. You should use StorageManager.persist() to get persistent storage instead.

Note: You can find out more information on the different available storage types, and how Firefox handles client-side data storage, at Browser storage limits and eviction criteria.

Return value

A IDBOpenDBRequest object on which subsequent events related to this request are fired.

Exceptions

TypeError: Thrown if the value of version is not a number greater than zero.

Examples

Example of calling open with the current specification's version parameter:

const request = window.indexedDB.open("toDoList", 4);

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 the example live).

const note = document.querySelector("ul");

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

// these two event handlers act on the database being opened
// successfully, or not
DBOpenRequest.onerror = (event) => {
  note.innerHTML += '<li>Error loading database.</li>';
};

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 later on, for opening
  // transactions and suchlike.
  db = DBOpenRequest.result;
};

Specifications

Specification
Indexed Database API 3.0 # ref-for-dom-idbfactory-open②

Browser compatibility

BCD tables only load in the browser