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.

Syntax

var oldVersion = IDBVersionChangeEvent.oldVersion

Value

A 64-bit integer.

Example

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 Status Comment
Indexed Database API 2.0
The definition of 'oldVersion' in that specification.
Recommendation
Indexed Database API 2.0
The definition of 'oldVersion' in that specification.
Recommendation

Browser compatibility

BCD tables only load in the browser

See also