Checkbox With Error

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import type { ChangeEvent, ReactNode } from "react";
import { useId, useState } from "react";

function cx(...parts: Array<string | false | null | undefined>): string {
  return parts.filter(Boolean).join(" ");
}

export interface CheckboxWithErrorProps {
  label: ReactNode;
  error?: string;
  helperText?: ReactNode;
  checked?: boolean;
  defaultChecked?: boolean;
  onChange?: (checked: boolean, event: ChangeEvent<HTMLInputElement>) => void;
  disabled?: boolean;
  required?: boolean;
  name?: string;
  value?: string | number | readonly string[];
  id?: string;
  className?: string;
}

/**
 * Checkbox with an associated validation message. Sets `aria-invalid="true"`
 * and links the error message with `aria-describedby`, so the failure is
 * communicated beyond color. The indicator border + check take the
 * destructive token. Built on the native `<input type="checkbox">`.
 */
export function CheckboxWithError({
  label,
  error,
  helperText,
  checked,
  defaultChecked,
  onChange,
  disabled,
  required,
  name,
  value,
  id,
  className,
}: CheckboxWithErrorProps) {
  const generatedId = useId();
  const inputId = id ?? `checkbox-${generatedId}`;
  const messageId = `${inputId}-msg`;
  const isControlled = checked !== undefined;
  const [internal, setInternal] = useState<boolean>(defaultChecked ?? false);
  const isChecked = isControlled ? checked : internal;
  const hasError = Boolean(error);

  function handleChange(event: ChangeEvent<HTMLInputElement>) {
    const next = event.target.checked;
    if (!isControlled) setInternal(next);
    onChange?.(next, event);
  }

  return (
    <div className={cx("flex flex-col gap-1", className)}>
      <label
        htmlFor={inputId}
        className={cx(
          "inline-flex items-center gap-2.5 text-sm leading-5 text-[var(--ds-color-foreground)]",
          disabled ? "cursor-not-allowed opacity-60" : "cursor-pointer",
        )}
      >
        <span className="relative inline-flex size-[18px] shrink-0 items-center justify-center">
          <input
            id={inputId}
            type="checkbox"
            aria-invalid={hasError ? true : undefined}
            aria-describedby={hasError || helperText ? messageId : undefined}
            className={cx(
              "size-[18px] cursor-pointer appearance-none rounded-[var(--ds-radius-xs)] border bg-[var(--ds-color-input)] transition-colors duration-150 ease-out hover:border-[var(--ds-color-border-strong)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:cursor-not-allowed disabled:opacity-50 motion-reduce:transition-none",
              hasError
                ? "border-[var(--ds-color-destructive)] checked:border-[var(--ds-color-destructive)] checked:bg-[var(--ds-color-destructive)]"
                : "border-[var(--ds-color-border)] checked:border-[var(--ds-color-primary)] checked:bg-[var(--ds-color-primary)]",
            )}
            checked={isControlled ? isChecked : undefined}
            defaultChecked={isControlled ? undefined : defaultChecked}
            disabled={disabled}
            required={required}
            name={name}
            value={value}
            onChange={handleChange}
          />
          <span
            aria-hidden="true"
            className={cx(
              "pointer-events-none absolute inset-0 flex items-center justify-center transition-opacity duration-150 motion-reduce:transition-none",
              hasError ? "text-[var(--ds-color-destructive-foreground)]" : "text-[var(--ds-color-primary-foreground)]",
              isChecked ? "opacity-100" : "opacity-0",
            )}
          >
            <svg className="size-[12px]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={3.5} strokeLinecap="round" strokeLinejoin="round">
              <path d="M20 6 9 17l-5-5" />
            </svg>
          </span>
        </span>
        <span className="select-none">
          {label}
          {required ? (
            <span aria-hidden="true" className="ml-0.5 text-[var(--ds-color-destructive)]">*</span>
          ) : null}
        </span>
      </label>
      {hasError ? (
        <p id={messageId} role="alert" className="pl-[26px] text-xs leading-4 text-[var(--ds-color-destructive)]">
          {error}
        </p>
      ) : helperText ? (
        <p id={messageId} className="pl-[26px] text-xs leading-4 text-[var(--ds-color-muted-foreground)]">
          {helperText}
        </p>
      ) : null}
    </div>
  );
}

export default CheckboxWithError;

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/* DevSnips React — JavaScript parity build.
 * Same API, behavior, and classes as code.tsx; TypeScript types removed.
 * Regenerated from code.tsx — edit code.tsx and re-run the generator.
 */

import { useId, useState } from "react";
function cx(...parts) {
  return parts.filter(Boolean).join(" ");
}
export function CheckboxWithError({
  label,
  error,
  helperText,
  checked,
  defaultChecked,
  onChange,
  disabled,
  required,
  name,
  value,
  id,
  className
}) {
  const generatedId = useId();
  const inputId = id ?? `checkbox-${generatedId}`;
  const messageId = `${inputId}-msg`;
  const isControlled = checked !== undefined;
  const [internal, setInternal] = useState(defaultChecked ?? false);
  const isChecked = isControlled ? checked : internal;
  const hasError = Boolean(error);
  function handleChange(event) {
    const next = event.target.checked;
    if (!isControlled) setInternal(next);
    onChange?.(next, event);
  }
  return <div className={cx("flex flex-col gap-1", className)}>
      <label
    htmlFor={inputId}
    className={cx(
      "inline-flex items-center gap-2.5 text-sm leading-5 text-[var(--ds-color-foreground)]",
      disabled ? "cursor-not-allowed opacity-60" : "cursor-pointer"
    )}
  >
        <span className="relative inline-flex size-[18px] shrink-0 items-center justify-center">
          <input
    id={inputId}
    type="checkbox"
    aria-invalid={hasError ? true : undefined}
    aria-describedby={hasError || helperText ? messageId : undefined}
    className={cx(
      "size-[18px] cursor-pointer appearance-none rounded-[var(--ds-radius-xs)] border bg-[var(--ds-color-input)] transition-colors duration-150 ease-out hover:border-[var(--ds-color-border-strong)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:cursor-not-allowed disabled:opacity-50 motion-reduce:transition-none",
      hasError ? "border-[var(--ds-color-destructive)] checked:border-[var(--ds-color-destructive)] checked:bg-[var(--ds-color-destructive)]" : "border-[var(--ds-color-border)] checked:border-[var(--ds-color-primary)] checked:bg-[var(--ds-color-primary)]"
    )}
    checked={isControlled ? isChecked : undefined}
    defaultChecked={isControlled ? undefined : defaultChecked}
    disabled={disabled}
    required={required}
    name={name}
    value={value}
    onChange={handleChange}
  />
          <span
    aria-hidden="true"
    className={cx(
      "pointer-events-none absolute inset-0 flex items-center justify-center transition-opacity duration-150 motion-reduce:transition-none",
      hasError ? "text-[var(--ds-color-destructive-foreground)]" : "text-[var(--ds-color-primary-foreground)]",
      isChecked ? "opacity-100" : "opacity-0"
    )}
  >
            <svg className="size-[12px]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={3.5} strokeLinecap="round" strokeLinejoin="round">
              <path d="M20 6 9 17l-5-5" />
            </svg>
          </span>
        </span>
        <span className="select-none">
          {label}
          {required ? <span aria-hidden="true" className="ml-0.5 text-[var(--ds-color-destructive)]">*</span> : null}
        </span>
      </label>
      {hasError ? <p id={messageId} role="alert" className="pl-[26px] text-xs leading-4 text-[var(--ds-color-destructive)]">
          {error}
        </p> : helperText ? <p id={messageId} className="pl-[26px] text-xs leading-4 text-[var(--ds-color-muted-foreground)]">
          {helperText}
        </p> : null}
    </div>;
}

export default CheckboxWithError;

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# Checkbox With Error

Checkbox with an associated validation message; sets aria-invalid and links the error via aria-describedby.

## Usage

```tsx
<CheckboxWithError label="I accept the terms" error="You must accept the terms to continue." />
```

## JavaScript

A `code.jsx` build is provided for projects that ship plain JSX. It exposes the same API and behavior as `code.tsx` — only the TypeScript types are removed.

```jsx
<CheckboxWithError label="I accept the terms" error="You must accept the terms to continue." />
```

## Props

| Name | Type | Default | Description |
|---|---|---:|---|
| `label` | `ReactNode` (required) | — | Visible label (omit for an icon-only / aria-label control). |
| `checked` / `defaultChecked` | `boolean` | `false` | Controlled / uncontrolled checked state. |
| `onChange` | `(checked, event) => void` | — | Change callback. |
| `disabled` | `boolean` | — | Disables the control. |
| `readOnly` | `boolean` | — | Read-only (blocks toggling). |
| `required` | `boolean` | — | Marks the field required (renders `*`). |
| `invalid` | `boolean` | — | Sets `aria-invalid` + destructive styling. |
| `name` / `value` | `string` | — | Native form name/value. |
| `id` | `string` | generated | Input id (also the label `htmlFor`). |
| `aria-label` / `aria-labelledby` / `aria-describedby` | `string` | — | Override association. |
| `error` | `string` | — | Error message (sets `aria-invalid`, destructive styling, `role="alert"`). |
| `helperText` | `ReactNode` | — | Shown when no error is present. |

## States

Native checkbox with an optional error message. When `error` is set the input gets `aria-invalid="true"`, the border + check take the destructive token, and the message is rendered with `role="alert"` and `aria-describedby`. The failure is communicated by border, check color, and text — not color alone.

## Accessibility

`aria-invalid="true"` + `aria-describedby={messageId}` on the native input; error paragraph carries `role="alert"`. Visible `focus-visible` ring.

## Styling

Built with React, Tailwind CSS, and DevSnips design tokens. The component consumes the `--ds-*` semantic tokens via arbitrary values (for example `bg-[var(--ds-color-primary)]`). Define the tokens once in your theme — no component-specific CSS file is required.

## Design Tokens

See [React/DESIGN_TOKENS.md](../../../DESIGN_TOKENS.md) for the authoritative token specification. This checkbox uses the semantic color, radius, spacing, and motion tokens.

## Notes

The error state never relies on color alone — the border, the check, and the message all change. Swap `error` for `helperText` to return to a neutral helper.