[Home](./index.md) > [@firebase/database](./database.md) > [onDisconnect](./database.ondisconnect.md) ## onDisconnect() function Returns an `OnDisconnect` object - see [Enabling Offline Capabilities in JavaScript](https://firebase.google.com/docs/database/web/offline-capabilities) for more information on how to use it. Signature: ```typescript export declare function onDisconnect(ref: Reference): OnDisconnect; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | ref | [Reference](./database.reference.md) | The reference to add OnDisconnect triggers for. | Returns: [OnDisconnect](./database.ondisconnect.md)