---
title: "custom is empty · RUAL Documentation"
description: "Checks if a custom field is empty."
canonical: https://docs.rual.nl/block-types/state%20ui/state_custom_is_empty
language: en
---

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# 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%2520ui/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)](https://docs.rual.nl/canvas-examples/state_custom_is_empty.png?v=3)

## Version history

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

- [Back to `state ui`](https://docs.rual.nl/block-types/state%20ui): Return to the main group to view all sub-groups

- [Back to `state conditions`](https://docs.rual.nl/block-types/state%20ui?group=state%20conditions): Return to the group to view all blocks within this group

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