The error
handler is executed when an error caused a request to fail.
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.addEventListener('upgradeneeded', 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.addEventListener('success', event => { const db = DBOpenRequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['toDoList'], 'readwrite'); 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); objectStoreRequest.addEventListener('error', () => { console.log(`Error adding new item: ${newItem.taskTitle}`); }); });
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; 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 => { const db = DBOpenRequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['toDoList'], 'readwrite'); 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); objectStoreRequest.onerror = () => { console.log(`Error adding new item: ${newItem.taskTitle}`); }; };
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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
error event | Chrome
Full support
24
| Edge Full support 12 | Firefox
Full support
16
| 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