IDBVersionChangeEvent: oldVersion property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
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.
Value
A number containing a 64-bit integer.
Examples
js
const dbName = "sampleDB";
const dbVersion = 2;
const request = indexedDB.open(dbName, dbVersion);
request.onupgradeneeded = (e) => {
const 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
| desktop | mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
oldVersion
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
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 the example live).