IDBRequest.readyState
The readyState
read-only property of the
IDBRequest
interface returns the state of the request.
>Every request starts in the pending
state. The state changes to
done
when the request completes successfully or when an error
occurs.
Note: This feature is available in Web Workers
Value
The IDBRequestReadyState
of the request, which takes one of the
following two values:
Value | Meaning |
---|---|
pending |
The request is pending. |
done |
The request is done. |
Examples
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 in another request. The readyState
of the 2nd request is logged to
the developer console. 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);
// Log the source of this request
console.log("The readyState of this request is " + updateTitleRequest.readyState);
// When this new request succeeds, run the displayData()
// function again to update the display
updateTitleRequest.onsuccess = function() {
displayData();
};
};
Specifications
Specification |
---|
Indexed Database API 3.0 # ref-for-dom-idbrequest-readystate① |
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.)