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 September 2021.

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

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
oldVersion

Legend

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Full support
Full support

See also