IDBCursor.continue()
The continue()
method of the IDBCursor
interface advances the cursor to the next position along its direction, to the item
whose key matches the optional key parameter. If no key is specified, the cursor
advances to the immediate next position, based on its direction.
Note: This feature is available in Web Workers.
Syntax
cursor.continue(key);
Parameters
key
Optional- The key to position the cursor at.
Exceptions
This method may raise a DOMException
of one of the following types:
Exception | Description |
---|---|
TransactionInactiveError |
This IDBCursor's transaction is inactive. |
DataError |
The key parameter may have any of the following conditions:
|
InvalidStateError |
The cursor 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. 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 displayData() { var transaction = db.transaction(['rushAlbumList'], "readonly"); var objectStore = transaction.objectStore('rushAlbumList'); objectStore.openCursor().onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listItem = document.createElement('li'); listItem.innerHTML = cursor.value.albumTitle + ', ' + cursor.value.year; list.appendChild(listItem); cursor.continue(); } else { console.log('Entries all displayed.'); } }; };
Specifications
Specification | Status | Comment |
---|---|---|
Indexed Database API 2.0 The definition of 'continue()' in that specification. |
Recommendation | |
Indexed Database API 2.0 The definition of 'continue()' in that specification. |
Recommendation |
Browser compatibility
BCD tables only load in the browser
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.)