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IDBVersionChangeEvent: oldVersion property

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

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
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
oldVersion 23 12 10 10 15 8 4.4 25 22 14 8 1.5

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/IDBVersionChangeEvent/oldVersion