---
title: "update server state if empty · RUAL Documentation"
description: "Sends a state update to the frontend and triggers updates based of it if the field is empty."
canonical: https://docs.rual.nl/block-types/state ui/state_update_state_if_empty
language: en
---

# update server state if empty

This block is part of the [`state ui`](https://docs.rual.nl/block-types/state%20ui) group and was last modified in core [`v10.4.28`](https://docs.rual.nl/core-versions/100428).

### Type Selection Required

This block requires you to select the data type you want to work with. You must manually select the type using the type selector modal. To access the modal, click the white button on the block.

### Field Selection Required

This block requires field selection (in). You must manually select the fields you want to work with using the field selector modal. To access the modal, click the white button on the block.

Sends a state update to the frontend and triggers updates based of it if the field is empty.

- flow `flow`

- state key required `value` State key to update

- flow `flow`

A typical wiring for [update server state if empty](https://docs.rual.nl/block-types/state%20ui/state_update_state_if_empty): a [function trigger](https://docs.rual.nl/block-types/globals/trigger_custom_function) starts the flow; [value](https://docs.rual.nl/block-types/value/value_default) feeds the `key` pin; the `flow` out pin feeds [debug](https://docs.rual.nl/block-types/state%20ui/state_debug).

![Studio canvas example for the update server state if empty block: typical wiring for update server state if empty.](https://docs.rual.nl/canvas-examples/state_update_state_if_empty.png)

### Version history

Introduced in [`v10.4.28`](https://docs.rual.nl/core-versions/100428).