idb/event

Types

ConnectEventHandler

Type to represent event handlers of the connect function.

Use on_upgrade, on_blocked, on_blocking, or on_terminated to create an instance of ConnectEventHandler.

pub type ConnectEventHandler(a, b, c, d) {
  OnUpgrade(fn(@internal Transaction, Int, Int) -> a)
  OnBlocked(fn(Int, Int) -> b)
  OnBlocking(fn(Int, Int) -> c)
  OnTerminated(fn() -> d)
}

Constructors

```
OnUpgrade(fn(@internal Transaction, Int, Int) -> a)
```
Handles database version upgrade.

The handler is executed when an attempt was made to connect to a database with a version number higher than its current version. When the opened database doesn’t exist yet, its current version is 0.

A versionchange transaction, the current version, and the new version of the database will be provided to the handler. The returned value is discarded.

Similar to the IDBOpenDBRequest.onupgradeneeded on the IndexedDB API.
```
OnBlocked(fn(Int, Int) -> b)
```
Handles blocked database version upgrade.

The handler is executed when an attempt was blocked to connect to a database with a version number higher than its current version.

The current version and the new version of the database will be provided to the handler. The returned value is discarded.

Similar to the IDBOpenDBRequest.onblocked on the IndexedDB API.
```
OnBlocking(fn(Int, Int) -> c)
```
Handles database version upgrade request.

The handler is executed when this connection is blocking an attempt to connect to this database with a version number higher than its current version.

The current version and the blocked version of the database will be provided to the handler. The returned value is discarded.

Similar to the IDBDatabase.onversionchange on the IndexedDB API.
```
OnTerminated(fn() -> d)
```
Handles unexpected connection termination.

The returned value is discarded.

Similar to the IDBDatabase.onclose on the IndexedDB API.