The onerror
event handler of the IDBRequest
interface handles the error
event, fired when a request returns an error.
The event handler takes one parameter, an error Event with type="error".
Note: This feature is available in Web Workers.
Syntax
request.onerror = function(event) { ... };
Example
The following example requests a given record title, onsuccess
gets the associated record from the IDBObjectStore
(made available as objectStoreTitleRequest.result
), updates one property of the record, and then puts the updated record back into the object store. Also included at the bottom is an onerror
function that reports what the error was if the request fails. For a full working example, see our To-do Notifications app (view example live.)
var title = "Walk dog"; // Open up a transaction as usual var objectStore = db.transaction(['toDoList'], "readwrite").objectStore('toDoList'); // Get the to-do list object that has this title as it's title var objectStoreTitleRequest = objectStore.get(title); objectStoreTitleRequest.onsuccess = function() { // Grab the data object returned as the result var data = objectStoreTitleRequest.result; // Update the notified value in the object to "yes" data.notified = "yes"; // Create another request that inserts the item back // into the database var updateTitleRequest = objectStore.put(data); // When this new request succeeds, run the displayData() // function again to update the display updateTitleRequest.onsuccess = function() { displayData(); }; }; objectStoreTitleRequest.onerror = function() { // If an error occurs with the request, log what it is console.log("There has been an error with retrieving your data: " + objectStoreTitleRequest.error); };
Specifications
Specification | Status | Comment |
---|---|---|
Indexed Database API The definition of 'onerror' in that specification. |
Recommendation | |
Indexed Database API 2.0 The definition of 'onerror' in that specification. |
Editor's Draft |
Browser compatibility
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|---|
Basic support | 23webkit 24 (unprefixed) |
(Yes) | 10 moz 16.0 (16.0) |
10, partial | 15 | 7.1 |
Available in workers | (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) | ? | 37.0 (37.0) | (Yes) | ? | (Yes) | ? |
Indexed Database 2.0 | 58 | 58 | ? | ? | ? | ? | 45 | ? |
See also
- Using IndexedDB
- Error Event
- 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.)