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The delete()
method of the IDBObjectStore
interface returns an IDBRequest
object, and, in a separate thread, deletes the specified record. This is for deleting individual records out of an object store.
Syntax
var request = objectStore.delete(recordKey);
Return value
An IDBRequest
object on which subsequent events related to this operation are fired. The request.result
attribute is set to undefined.
Exceptions
This method may raise a DOMException
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. |
DataError |
The key is not a valid key or a key range |
Example
In the following code snippet, we open a read/write transaction on our database and delete one specific record out of our object store using delete()
— a sample record with the key "Walk dog". For a full working example, see our To-do Notifications app (view example live.)
// Let us open our database var DBOpenRequest = window.indexedDB.open("toDoList", 4); DBOpenRequest.onsuccess = function(event) { note.innerHTML += '<li>Database initialised.</li>'; // store the result of opening the database in the db variable. This is used a lot below db = DBOpenRequest.result; // Run the deleteData() function to delete a record from the database deleteData(); }; function deleteData() { // open a read/write db transaction, ready for deleting the data var transaction = db.transaction(["toDoList"], "readwrite"); // report on the success of opening the transaction transaction.oncomplete = function(event) { note.innerHTML += '<li>Transaction completed: database modification finished.</li>'; }; transaction.onerror = function(event) { note.innerHTML += '<li>Transaction not opened due to error: ' + transaction.error + '</li>'; }; // create an object store on the transaction var objectStore = transaction.objectStore("toDoList"); // Delete the specified record out of the object store var objectStoreRequest = objectStore.delete("Walk dog"); objectStoreRequest.onsuccess = function(event) { // report the success of our delete operation note.innerHTML += '<li>Record deleted.</li>'; }; };
Parameters
- Key
- The key of the object(s) to be deleted.
Specification
Specification | Status | Comment |
---|---|---|
Indexed Database API The definition of 'delete()' in that specification. |
Recommendation |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 23webkit 24 |
10 moz 16.0 (16.0) |
10, partial | 15 | 7.1 |
Available in workers | (Yes) | 37.0 (37.0) | ? | (Yes) | ? |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | 4.4 | 22.0 (22.0) | 1.0.1 | 10 | 22 | 8 |
Available in workers | (Yes) | 37.0 (37.0) | (Yes) | ? | (Yes) | ? |
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.)