The blocked
handler is executed when an open connection to a database is blocking a versionchange
transaction on the same database.
This event is not cancelable and does not bubble.
The blocked
handler is executed when an open connection to a database is blocking a versionchange
transaction on the same database.
This event is not cancelable and does not bubble.
Use the event name in methods like addEventListener()
, or set an event handler property.
addEventListener('blocked', event => { }); onblocked = event => { };
An IDBVersionChangeEvent
. Inherits from Event
.
Also inherits properties from its parent, Event
interface.
IDBVersionChangeEvent.oldVersion
Read only
Returns the old version of the database.
IDBVersionChangeEvent.newVersion
Read only
Returns the new version of the database.
Using addEventListener()
:
// Open the database const DBOpenRequest = window.indexedDB.open('toDoList', 4); DBOpenRequest.onupgradeneeded = (event) => { const db = event.target.result; db.onerror = () => { console.log('Error creating database'); }; // 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 }); }; DBOpenRequest.onsuccess = (event) => { // Let's try to open the same database with a higher revision version const req2 = indexedDB.open('toDoList', 5); // In this case the onblocked handler will be executed req2.addEventListener('blocked', () => { console.log('Request was blocked'); }); };
Using the onblocked
property:
// Open the database const DBOpenRequest = window.indexedDB.open('toDoList', 4); DBOpenRequest.onupgradeneeded = (event) => { const db = event.target.result; db.onerror = () => { console.log('Error creating database'); }; // 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 }); }; DBOpenRequest.onsuccess = (event) => { // Let's try to open the same database with a higher revision version const req2 = indexedDB.open('toDoList', 5); // In this case the onblocked handler will be executed req2.onblocked = () => { console.log('Request was blocked'); }; };
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
blocked_event |
23
|
12
|
10
|
10
|
15
|
7
|
4.4
|
25
|
22
|
14
|
8
|
1.5
|
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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/IDBOpenDBRequest/blocked_event