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 event target (the topmost target in the DOM tree). |
type Read only |
DOMString |
The type of event. |
bubbles Read only |
Boolean |
Whether the event normally bubbles or not. |
cancelable Read only |
Boolean |
Whether the event is cancellable or not. |
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 });