The oldVersion
read-only property of the IDBVersionChangeEvent
interface returns the old version number of the database.
When the opened database doesn't exist yet, the value of oldVersion
is 0.
Note: This feature is available in Web Workers.
Syntax
var oldVersion = IDBVersionChangeEvent.oldVersion
Value
Example
var dbName = "sampleDB"; var dbVersion = 2; var request = indexedDB.open(dbName, dbVersion); request.onupgradeneeded = function(e) { var db = request.result; if (e.oldVersion < 1) { db.createObjectStore("store1"); } if (e.oldVersion < 2) { db.deleteObjectStore("store1"); db.createObjectStore("store2"); } // etc. for version < 3, 4... };
Specifications
Specification | Status | Comment |
---|---|---|
Indexed Database API The definition of 'oldVersion' in that specification. |
Recommendation | |
Indexed Database API 2.0 The definition of 'oldVersion' in that specification. |
Editor's Draft |
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.)