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Share Point-hosted Share Point Add-ins do not support event handling, but you can turn a workflow into a kind of list or list item event handler by setting an event to trigger the workflow.For more information, see Workflows in Share Point.The URL of the RER service is registered for the events it handles.There are two ways to register a handler: The field update events are about changing the properties of a field (column) on a list, such as whether it is sortable, not about changing the data in the field.Workflows cannot be triggered by add-in events, so add-in events cannot be handled with a Share Point-hosted add-in.To handle list and list item events, you create remote event receivers (RERs), which are web services that run externally to the Share Point farm or Share Point Online.The App Installed event runs immediately after Share Point has finished everything that it needs to do when the add-in is installed, but before the user is notified that installation is complete. The add-in is not available for use until after your handler has completed, and your handler can cancel the installation (which causes Share Point to roll back everything it has done as part of the installation).In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.
This last task triggers the App Uninstalling event.
Add-in events are also handled by remote web services, but they are configured differently in the add-in package from list and list item RERs, so they are treated as a separate category of component.
For an add-in event, the remote web service is registered in the add-in manifest, not in an add-in web feature.
However, your App Uninstalling handler completes If Share Point doesn't receive a results message from your handler in 30 seconds, it calls the handler again.
It gives up entirely and rolls back the event after three retries (four tries in all).For more information, see Include rollback logic and "already done" logic in your add-in event handlers.