The versionchange
event is fired when a database structure change (upgradeneeded
event send on an IDBOpenDBRequest
or IDBFactory.deleteDatabase
) was requested elsewhere (most probably in another window/tab on the same computer).
The versionchange
event is fired when a database structure change (upgradeneeded
event send on an IDBOpenDBRequest
or IDBFactory.deleteDatabase
) was requested elsewhere (most probably in another window/tab on the same computer).
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("versionchange", (event) => {}); onversionchange = (event) => {};
A generic Event
.
This example opens a database and, on success, adds a listener to versionchange
:
js
// 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:
js
// 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"); }; };
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 | 8 | 4.4 | 25 | 22 | 14 | 8 | 1.5 |
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https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabase/versionchange_event