The upgradeneeded handler is executed when an attempt was made to open a database with a version number higher than its current version.
General info
- Specification
- IndexedDB
- Interface
- Event
- Bubbles
- No
- Cancelable
- No
- Target
- IDBRequest
- Default Action
- None
Properties
| Property | Type | Description |
|---|---|---|
target Read only |
EventTarget |
The request concerned by this event |
type Read only |
DOMString |
The type of event. |
bubbles Read only |
boolean |
Does the event normally bubble? |
cancelable Read only |
boolean |
Is it possible to cancel the event? |
Example
var req1 = indexedDB.open("addressbook", 999);
req1.onupgradeneeded = function( event ) {
// time for a versionchange transaction
};
// which is equivalent to
req1.addEventListener("upgradeneeded", function( event ) {
// time for a versionchange transaction
});