---
title: "custom is empty · RUAL Documentation"
description: "Checks if a custom field is empty."
canonical: https://docs.rual.nl/block-types/state ui/state_custom_is_empty
language: en
---

# custom is 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).

Checks if a custom field is empty.

- field required `value` The name of field to grab from the current UI state. Can be deep-key (e.g. `form.name`)

- condition `condition` Returns `true` if the given field is empty.

A typical wiring for [custom is empty](https://docs.rual.nl/block-types/state%20ui/state_custom_is_empty): [value](https://docs.rual.nl/block-types/value/value_default) feeds the `field` pin; the `condition` out pin feeds [branch](https://docs.rual.nl/block-types/flow/branch).

![Studio canvas example for the custom is empty block: typical wiring for custom is empty.](https://docs.rual.nl/canvas-examples/state_custom_is_empty.png)

### Version history

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