IDBVersionChangeEvent.oldVersion
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
Value
Examples
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 |
---|
Indexed Database API 3.0 # dom-idbversionchangeevent-oldversion |
Browser compatibility
BCD tables only load in the browser
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.)