---
title: "block"
slug: "user-block"
updated: 2025-11-06T18:56:13Z
published: 2025-11-06T18:56:13Z
canonical: "docs.doc-know.com/user-block"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.doc-know.com/llms.txt
> Use this file to discover all available pages before exploring further.

# block

### user.block

Queues a validation block that will prevent the user from continuing for a specified reason.

### Input Parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| **reason** | Text | Yes | Reason displayed to the user for being blocked |

### Returns

No return value.

### Examples

```
// block the user based on some criteria
if (avatar.age < 50)
    user.block("You are too young to qualify.");
```

### 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).