The delete()
method of the IDBCursor
interface returns an IDBRequest
object, and, in a separate thread, deletes the record at the cursor's position, without changing the cursor's position. Once the record is deleted, the cursor's value is set to null.
Be aware that you can't call delete()
(or IDBCursor.update()
) on cursors obtained from IDBIndex.openKeyCursor()
. For such needs, you have to use IDBIndex.openCursor()
instead.
Syntax
var anIDBRequest = myIDBCursor.delete();
Returns
An IDBRequest
object on which subsequent events related to this operation are fired. The result attribute is set to undefined.
Exceptions
This method may raise a DOMException
of one of the following types:
Exception | Description |
---|---|
TransactionInactiveError |
This IDBCursor's transaction is inactive. |
ReadOnlyError |
The transaction mode is read-only. |
InvalidStateError |
The cursor was created using IDBindex.openKeyCursor , is currently being iterated, or has iterated past its end. |
Example
In this simple fragment we create a transaction, retrieve an object store, then use a cursor to iterate through all the records in the object store. If the albumTitle
of the current cursor is "Grace under pressure", we delete that entire record using var request = cursor.delete();
.
The cursor does not require us to select the data based on a key; we can just grab all of it. Also note that in each iteration of the loop, you can grab data from the current record under the cursor object using cursor.value.foo
. For a complete working example, see our IDBCursor example (view example live.)
function deleteResult() {
list.innerHTML = '';
var transaction = db.transaction(['rushAlbumList'], 'readwrite');
var objectStore = transaction.objectStore('rushAlbumList');
objectStore.openCursor().onsuccess = function(event) {
var cursor = event.target.result;
if(cursor) {
if(cursor.value.albumTitle === 'Grace under pressure') {
var request = cursor.delete();
request.onsuccess = function() {
console.log('Deleted that mediocre album from 1984. Even Power windows is better.');
};
} else {
var listItem = document.createElement('li');
listItem.innerHTML = '<strong>' + cursor.value.albumTitle + '</strong>, ' + cursor.value.year;
list.appendChild(listItem);
}
cursor.continue();
} else {
console.log('Entries displayed.');
}
};
};
Specifications
Specification | Status | Comment |
---|---|---|
Indexed Database API The definition of 'delete()' in that specification. |
Recommendation | |
Indexed Database API 2.0 The definition of 'delete()' in that specification. |
Editor's Draft |
Browser compatibility
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|---|
Basic support | 23webkit 24 |
(Yes) | 10 moz 16.0 (16.0) |
10, partial | 15 | 7.1 |
Available in workers | (Yes) | (Yes) | 37.0 (37.0) | ? | (Yes) | ? |
Indexed Database 2.0 | 58 | ? | ? | ? | 45 | ? |
Feature | Android Webview | Chrome for Android | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | 22.0 (22.0) | 1.0.1 | 10 | 22 | 8 |
Available in workers | (Yes) | (Yes) | (Yes) | 37.0 (37.0) | (Yes) | ? | (Yes) | ? |
Indexed Database 2.0 | 58 | 58 | ? | ? | ? | ? | 45 | ? |
See also
- Using IndexedDB
- Starting transactions:
IDBDatabase
- Using transactions:
IDBTransaction
- Setting a range of keys:
IDBKeyRange
- Retrieving and making changes to your data:
IDBObjectStore
- Using cursors:
IDBCursor
- Reference example: To-do Notifications (view example live.)