IDBVersionChangeEvent: oldVersion property

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

BCD tables only load in the browser

See also