IDBDatabase.onversionchange

The onversionchange event handler of the IDBDatabase interface handles the versionchange event, fired when a database structure change (IDBOpenDBRequest.onupgradeneeded event or IDBFactory.deleteDatabase) was requested elsewhere (most probably in another window/tab on the same computer).

This is different from the versionchange transaction (but it is related).

Note: This feature is available in Web Workers

Syntax

IDBDatabase.onversionchange = function(event) { ... }

Example

This example shows an IDBOpenDBRequest.onupgradeneeded block that creates a new object store; it also includes onerror and onabort functions to handle non-success cases, and an onversionchange function to notify when a database structure change has occurred.

request.onupgradeneeded = function(event) {
  var db = event.target.result;

  db.onerror = function(event) {
    note.innerHTML += '<li>Error opening database.</li>';
  };

  db.onabort = function(event) {
    note.innerHTML += '<li>Database opening aborted!</li>';
  };

  // Create an objectStore for this database

  var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });

  // define what data items the objectStore will contain

  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });

  objectStore.createIndex("notified", "notified", { unique: false });

  note.innerHTML += '<li>Object store created.</li>';

  db.onversionchange = function(event) {
    note.innerHTML += '<li>a database change has occurred; you should refresh this
                       browser window, or close it down and use the other open version of
                       this application, wherever it exists.</li>';
  };
};

Specifications

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
onversionchange
23
12
10
10
15
7
≤37
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/IDBDatabase/onversionchange