IDBDatabase: versionchange event
The versionchange
event is fired when a database structure change (IDBOpenDBRequest.onupgradeneeded
event or IDBFactory.deleteDatabase
) was requested.
Bubbles | No |
---|---|
Cancelable | No |
Interface | Event |
Event handler property | onversionchange |
Examples
This example opens a database and, on success, adds a listener to versionchange
:
// Open the database const dBOpenRequest = window.indexedDB.open('Nonexistent', 4); dBOpenRequest.onupgradeneeded = event => { const db = event.target.result; // Create an objectStore for this database const 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 }); }; dBOpenRequest.addEventListener('success', event => { const db = event.target.result; db.addEventListener('versionchange', event => { console.log('The version of this database has changed'); }); });
The same example, using the onversionchange
event handler property:
// Open the database const dBOpenRequest = window.indexedDB.open('Nonexistent', 4); dBOpenRequest.onupgradeneeded = event => { const db = event.target.result; // Create an objectStore for this database const 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 }); }; dBOpenRequest.onsuccess = event => { const db = event.target.result; db.onversionchange = event => { console.log('The version of this database has changed'); }; };
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 | |
versionchange_event |
23 |
12 |
10 |
10 |
15 |
7 |
≤37 |
25 |
22 |
14 |
8 |
1.5 |
See also
- Using IndexedDB
-
onversionchange
event handler property
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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/versionchange_event