---
title: "HASOTHER Builtin"
description: "Check if user entered an other option in choice field (SingleChoiceField or MultiChoiceField)"
category: "choice"
tags: ["choice", "other", "validation", "multichoice"]
---

# HASOTHER Function

The `HASOTHER` builtin checks if the user has entered an "other" option in a choice field, returning `true` if an other option is present, `false` otherwise. Works with both SingleChoiceField (single selection) and MultiChoiceField (multiple selections).

## Syntax

```javascript
HASOTHER(choiceField)
```

## Parameters

| Parameter | Type | Description |
|-----------|------|-------------|
| `choiceField` | `Object` | The choice field object (SingleChoiceField with choice array or MultiChoiceField with choices array) and other array |

## Return Value

Returns `true` if user entered an other option, `false` otherwise.

## Examples

### Basic Usage - SingleChoiceField

```javascript
// Check if user entered other option in single choice field
HASOTHER($city)
```

### Basic Usage - MultiChoiceField

```javascript
// Check if user entered other option in multi choice field
HASOTHER($colors)
```

### Conditional Logic

```javascript
// Show different content based on other option in single choice
IF(HASOTHER($city), "Custom city: " + OTHER($city), "Selected city: " + CHOICELABEL($city))

// Show different content based on other option in multi choice
IF(HASOTHER($colors), "Custom color: " + OTHER($colors), "Selected colors: " + CHOICELABELS($colors).join(", "))
```

### Validation

```javascript
// Require additional validation when other is selected
IF(HASOTHER($category), OTHER($category).length > 0, true)
```

### Form Behavior

```javascript
// Show additional fields when other is selected
IF(HASOTHER($reason), "Please specify: " + OTHER($reason), "")
```

## Use Cases

- **Conditional display**: Show additional fields or content when other options are selected
- **Validation**: Apply different validation rules when other options are present
- **Data processing**: Handle other options differently in calculations or logic
- **User experience**: Provide context-aware feedback based on other selections
- **Multi-choice support**: Works seamlessly with both single and multiple choice fields

## Best Practices

1. **Combine with OTHER**: Use together with `OTHER()` function to get the actual other value
2. **Validation**: Always validate other inputs when `HASOTHER` returns true
3. **User feedback**: Provide clear feedback when other options are selected
4. **Field dependencies**: Use to show/hide related fields
5. **Multi-choice compatibility**: Works with both SingleChoiceField and MultiChoiceField

## Related Functions

- [`OTHER`](./other.mdx) - Get the other option value
- [`CHOICEVALUE`](./choicevalue.mdx) - Get the selected choice value (SingleChoiceField)
- [`CHOICELABEL`](./choicelabel.mdx) - Get the selected choice label (SingleChoiceField)
- [`CHOICEVALUES`](./choicevalues.mdx) - Get all selected choice values (MultiChoiceField)
- [`CHOICELABELS`](./choicelabels.mdx) - Get all selected choice labels (MultiChoiceField)

## Examples by Use Case

### Dynamic Field Display

```javascript
// Show additional input field when other is selected
IF(HASOTHER($industry), "Specify industry: " + OTHER($industry), "")
```

### Validation Rules

```javascript
// Require other field to be non-empty when selected
AND(HASOTHER($reason), OTHER($reason).length > 3)
```

### Conditional Processing - SingleChoiceField

```javascript
// Different processing based on other selection
IF(HASOTHER($payment_method), "Custom payment: " + OTHER($payment_method), "Standard payment")
```

### Conditional Processing - MultiChoiceField

```javascript
// Different processing based on other selection in multi-choice
IF(HASOTHER($skills), "Custom skill: " + OTHER($skills), "Standard skills: " + CHOICELABELS($skills).join(", "))
```

### Form Completion

```javascript
// Check if form is complete including other fields
AND(CHOICEVALUE($category) !== null, IF(HASOTHER($category), OTHER($category).length > 0, true))
```

## Field Type Compatibility

- **SingleChoiceField**: Single selection with optional other input
- **MultiChoiceField**: Multiple selections with optional other input
- **Note**: User can only add 1 other option regardless of field type