The error
event is fired on IDBTransaction
when a request returns an error and the event bubbles up to the transaction object.
Bubbles | Yes |
Cancelable | No |
Interface | Event
|
Event handler property | onerror
|
Examples
This example opens a database and tries to add a record, listening for the error
event for the add()
operation (this will occur if, for example, a record with the given taskTitle
already exists):
// Open the database
const dBOpenRequest = window.indexedDB.open('toDoList', 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 = dBOpenRequest.result;
// open a read/write db transaction, ready for adding the data
const transaction = db.transaction(['toDoList'], 'readwrite');
transaction.addEventListener('error', () => {
console.log(`Error adding new item: ${newItem.taskTitle}`);
});
const objectStore = transaction.objectStore('toDoList');
const newItem = { taskTitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'January', year: 2020 };
const objectStoreRequest = objectStore.add(newItem);
};
The same example, using the onerror
property instead of addEventListener()
:
// Open the database
const dBOpenRequest = window.indexedDB.open('toDoList', 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 = dBOpenRequest.result;
// open a read/write db transaction, ready for adding the data
const transaction = db.transaction(['toDoList'], 'readwrite');
transaction.onerror = () => {
console.log(`Error adding new item: ${newItem.taskTitle}`);
};
const objectStore = transaction.objectStore('toDoList');
const newItem = { taskTitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'January', year: 2020 };
const objectStoreRequest = objectStore.add(newItem);
};
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
error event
|
Chrome Full support 24 Full support 24 Full support 23 Prefixed' Implemented with the vendor prefix: webkit |
Edge
Full support 12 |
Firefox Full support 16 Full support 16 No support 10 — 16 Prefixed' Implemented with the vendor prefix: moz |
IE
Partial support 10 |
Opera
Full support 15 |
Safari
Full support 7 |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
Full support 22 |
Opera Android
Full support 14 |
Safari iOS
Full support 8 |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
- Partial support
- Partial support
- Requires a vendor prefix or different name for use.'
- Requires a vendor prefix or different name for use.
See also
- Using IndexedDB
onerror
event handler property
IDBTransaction: error event by Mozilla Contributors is licensed under CC-BY-SA 2.5.