# FieldError · HeroUI

> Displays validation error messages for form fields

- Page: https://jiguang132.com/systems/heroui/docs/components/field-error
- Based on: HeroUI documentation (Apache-2.0) @ 60edd8ed751b1d2a270623fbb182bbcfa8baa9af

## Import

```tsx
import { FieldError } from '@heroui/react';
```

## Usage

The FieldError component displays validation error messages for form fields. It automatically appears when the parent field is marked as invalid and provides smooth opacity transitions.


> Example `field-error-basic`: interactive preview on https://jiguang132.com/systems/heroui/docs/components/field-error


## API

### FieldError Props

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `className` | `string` | - | Additional CSS classes |
| `children` | `ReactNode \| ((validation: ValidationResult) => ReactNode)` | - | Error message content or render function |

## Accessibility

The FieldError component ensures accessibility by:

- Using proper ARIA attributes for error announcement
- Supporting screen readers with semantic HTML
- Providing visual and programmatic error indication
- Automatically managing visibility based on validation state

## Styling

The FieldError component uses the following CSS classes:

- `.field-error` - Base error styles with danger color
- Only shows when the `data-visible` attribute is present
- Text is truncated with ellipsis for long messages

## Examples

### Basic Validation

```tsx
export function Basic() {
  const [value, setValue] = useState("");
  const isInvalid = value.length > 0 && value.length < 3;

  return (
    <TextField className="w-64" isInvalid={isInvalid}>
      <Label htmlFor="username">Username</Label>
      <Input
        id="username"
        placeholder="Enter username"
        value={value}
        onChange={(e) => setValue(e.target.value)}
      />
      <FieldError>Username must be at least 3 characters</FieldError>
    </TextField>
  );
}
```

### With Dynamic Messages

```tsx
<TextField isInvalid={errors.length > 0}>
  <Label>Password</Label>
  <Input type="password" />
  <FieldError>
    {(validation) => validation.validationErrors.join(', ')}
  </FieldError>
</TextField>
```

### Custom Validation Logic

```tsx
function EmailField() {
  const [email, setEmail] = useState('');
  const isInvalid = email.length > 0 && !email.includes('@');

  return (
    <TextField isInvalid={isInvalid}>
      <Label>Email</Label>
      <Input
        type="email"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
      />
      <FieldError>Email must include @ symbol</FieldError>
    </TextField>
  );
}
```

### Multiple Error Messages

```tsx
<TextField isInvalid={hasErrors}>
  <Label>Username</Label>
  <Input />
  <FieldError>
    {errors.map((error, i) => (
      <div key={i}>{error}</div>
    ))}
  </FieldError>
</TextField>
```

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