---
title: "blockIfEmpty"
slug: "user-blockifempty"
updated: 2025-11-06T18:55:47Z
published: 2025-11-06T18:55:47Z
canonical: "docs.doc-know.com/user-blockifempty"
---

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> Use this file to discover all available pages before exploring further.

# blockIfEmpty

### user.blockIfEmpty

Queues a validation block for an input object(s), conditioned on a value **not** having been specified by the user. When active, this block will prevent the user from continuing for the specified reason.

### Input Parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| **token** | Text | Yes | Input object token (i.e. [5]) |
| **reason** | Text | Yes | Reason displayed to the user for being blocked |
| **[type]** | Text | No | '**all**' = Blocks if **all** objects are empty (**default**); '**any**' = Blocks if **any** object is empty |

### Returns

No return value.

### Examples

```
// block the user if a value for input object [5] is missing
user.blockIfEmpty("[5]", "You must specify a pressure value.");
```

```
// block if both input objects [5] and [10] are empty
// note: specifying 'all' is not required since this is the default behavior
user.blockIfEmpty("[5], [10]", "You must specify a pressure value.", "all");
```

```
// block if either input objects [5] and [10] is empty
user.blockIfEmpty("[5], [10]", "You must specify a pressure value.", "any");
```

### Remarks

          Definition

          

**Validation** is the process of making sure user inputs contain appropriate values. For example, if numbers are within an expected range or if required values are even entered at all.

Products that run your apps will typically support a feature where your app's user inputs are **validated** at some point in time (i.e. when the user tries to **save** their work).

You can hook into the validation process using the blocking functions.

- **blockIfEmpty**(...) - blocks user if a value is missing
- **blockIfValue**(...) - blocks user if a specific value is entered
- **block**(...) - blocks user (without a condition)

          Validation Process

          

The runtime's validation process performs these steps when it's time to validate the user's inputs:

1. The **user** performs an **action** that triggers validation (i.e. **save**).
2. Your app's **Ux.Validate** script runs. This is your opportunity to add all the blocks you want via the available blocking functions. They are **queued** in the **order** they are added in your script.
3. The runtime **checks** to see if any blocks are queued.
4. If so, it **displays** a list of your blocking messages to the user and prevents them from continuing.
5. If **no** blocks are queued, the user's action will **proceed**.
6. All validation blocks are **reset** (cleared).