IDBFactory.open

If an error occurs while the database connection is being opened, then an error event is fired on the request object returned from this method.

May trigger upgradeneeded, blocked or versionchange events.

Syntax

For the current standard:

request = window.indexedDB.open(name[, version])

For the experimental version with options (see below):

request = window.indexedDB.open(name[, options])

Parameters

name

The name of the database.

version

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.

options (version and storage)

Optional. 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.

Returns

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

Exceptions

This method may raise a DOMException of the following types:

Exception	Description
TypeError	The value of version is zero or a negative number or not a number.

Example

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

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

Example of calling open with the options parameter:

var request = window.indexedDB.open("toDoList", {version: 4, storage: "temporary"});

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.)

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

// In the following line, you should include the prefixes of implementations you want to test.
window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
// DON'T use "var indexedDB = ..." if you're not in a function.
// Moreover, you may need references to some window.IDB* objects:
window.IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.msIDBTransaction;
window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange || window.msIDBKeyRange;
// (Mozilla has never prefixed these objects, so we don't need window.mozIDB*)

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

// these two event handlers act on the database being opened successfully, or not
DBOpenRequest.onerror = function(event) {
  note.innerHTML += '<li>Error loading database.</li>';
};
 
DBOpenRequest.onsuccess = function(event) {
  note.innerHTML += '<li>Database initialised.</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	Status	Comment
Indexed Database API The definition of 'open()' in that specification.	Recommendation

Browser compatibility

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 example live.)