Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The IDBVersionChangeEvent() constructor creates a new IDBVersionChangeEvent object, which is used to represent when a version of the database has changed, as a result of the onupgradeneeded event handler.


new IDBVersionChangeEvent(type)
new IDBVersionChangeEvent(type, options)



A string with the name of the event. It is case-sensitive and browsers set it to versionchange, success, or blocked.

options Optional

An object that, in addition of the properties defined in Event(), can have the following properties:

oldVersion Optional

A number representing the previous version of the database. It defaults to 0.

newVersion Optional

An unsigned long representing the new version of the database, or null if the database is being deleted. It defaults is null.

Return value

A new IDBVersionChangeEvent object.


For a full working example, see our To-do Notifications app (view example live).


Indexed Database API 3.0
# dom-idbversionchangeevent-idbversionchangeevent

Browser compatibility

BCD tables only load in the browser