Switch With Helper

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

/**
 * Switch with a visible label plus helper text. The helper is wired to the
 * input with `aria-describedby` so assistive tech announces it alongside the
 * label. Built on the native `<input type="checkbox" role="switch">`.
 */
export function SwitchWithHelper({
  label,
  helperText,
  checked,
  defaultChecked,
  onChange,
  disabled,
  required,
  invalid,
  name,
  value,
  id,
  className,
}: SwitchWithHelperProps) {
  const generatedId = useId();
  const inputId = id ?? `switch-${generatedId}`;
  const helperId = `${inputId}-helper`;
  const isControlled = checked !== undefined;
  const [internal, setInternal] = useState<boolean>(defaultChecked ?? false);
  const isChecked = isControlled ? checked : internal;

  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" : "cursor-pointer",
        )}
      >
        <span className={cx("relative inline-flex h-[14px] w-[24px] shrink-0 items-center", disabled && "opacity-50")}>
          <input
            id={inputId}
            type="checkbox"
            role="switch"
            aria-checked={isChecked}
            aria-describedby={helperId}
            className={cx(
              "absolute inset-0 h-full w-full cursor-pointer appearance-none rounded-full border 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 motion-reduce:transition-none",
              invalid
                ? (isChecked
                  ? "border-[var(--ds-color-destructive)] bg-[var(--ds-color-destructive)]"
                  : "border-[var(--ds-color-destructive)]")
                : isChecked
                  ? "border-[var(--ds-color-primary)] bg-[var(--ds-color-primary)]"
                  : "border-[var(--ds-color-border)] bg-[var(--ds-color-input)]",
            )}
            checked={isControlled ? isChecked : undefined}
            defaultChecked={isControlled ? undefined : defaultChecked}
            disabled={disabled}
            required={required}
            aria-invalid={invalid ? true : undefined}
            name={name}
            value={value}
            onChange={handleChange}
          />
          <span
            aria-hidden="true"
            className={cx(
              "pointer-events-none absolute left-[2px] top-[2px] size-[10px] rounded-full transition-[transform,background-color] duration-150 ease-out motion-reduce:transition-none",
              isChecked ? "translate-x-[10px]" : "translate-x-0",
              invalid && isChecked
                ? "bg-[var(--ds-color-destructive-foreground)]"
                : isChecked
                  ? "bg-[var(--ds-color-primary-foreground)]"
                  : "bg-[var(--ds-color-muted-foreground)]",
            )}
          />
        </span>
        <span className="select-none">
          {label}
          {required ? (
            <span aria-hidden="true" className="ml-0.5 text-[var(--ds-color-destructive)]">*</span>
          ) : null}
        </span>
      </label>
      <p id={helperId} className="pl-[34px] text-xs leading-4 text-[var(--ds-color-muted-foreground)]">
        {helperText}
      </p>
    </div>
  );
}

export default SwitchWithHelper;

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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 SwitchWithHelper({
  label,
  helperText,
  checked,
  defaultChecked,
  onChange,
  disabled,
  required,
  invalid,
  name,
  value,
  id,
  className
}) {
  const generatedId = useId();
  const inputId = id ?? `switch-${generatedId}`;
  const helperId = `${inputId}-helper`;
  const isControlled = checked !== undefined;
  const [internal, setInternal] = useState(defaultChecked ?? false);
  const isChecked = isControlled ? checked : internal;
  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" : "cursor-pointer"
    )}
  >
        <span className={cx("relative inline-flex h-[14px] w-[24px] shrink-0 items-center", disabled && "opacity-50")}>
          <input
    id={inputId}
    type="checkbox"
    role="switch"
    aria-checked={isChecked}
    aria-describedby={helperId}
    className={cx(
      "absolute inset-0 h-full w-full cursor-pointer appearance-none rounded-full border 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 motion-reduce:transition-none",
      invalid ? isChecked ? "border-[var(--ds-color-destructive)] bg-[var(--ds-color-destructive)]" : "border-[var(--ds-color-destructive)]" : isChecked ? "border-[var(--ds-color-primary)] bg-[var(--ds-color-primary)]" : "border-[var(--ds-color-border)] bg-[var(--ds-color-input)]"
    )}
    checked={isControlled ? isChecked : undefined}
    defaultChecked={isControlled ? undefined : defaultChecked}
    disabled={disabled}
    required={required}
    aria-invalid={invalid ? true : undefined}
    name={name}
    value={value}
    onChange={handleChange}
  />
          <span
    aria-hidden="true"
    className={cx(
      "pointer-events-none absolute left-[2px] top-[2px] size-[10px] rounded-full transition-[transform,background-color] duration-150 ease-out motion-reduce:transition-none",
      isChecked ? "translate-x-[10px]" : "translate-x-0",
      invalid && isChecked ? "bg-[var(--ds-color-destructive-foreground)]" : isChecked ? "bg-[var(--ds-color-primary-foreground)]" : "bg-[var(--ds-color-muted-foreground)]"
    )}
  />
        </span>
        <span className="select-none">
          {label}
          {required ? <span aria-hidden="true" className="ml-0.5 text-[var(--ds-color-destructive)]">*</span> : null}
        </span>
      </label>
      <p id={helperId} className="pl-[34px] text-xs leading-4 text-[var(--ds-color-muted-foreground)]">
        {helperText}
      </p>
    </div>;
}

export default SwitchWithHelper;

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# Switch With Helper

Switch with a visible label plus helper text wired via aria-describedby.

## Usage

```tsx
<SwitchWithHelper label="Product updates" helperText="Sent at most once a week." defaultChecked />
```

## 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
<SwitchWithHelper label="Product updates" helperText="Sent at most once a week." defaultChecked />
```

## 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. |
| `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. |
| `helperText` | `ReactNode` (required) | — | Supporting text linked with `aria-describedby`. |

## States

Native switch + a label and a helper paragraph. The helper is linked to the input with `aria-describedby` so assistive tech announces it after the label. The helper is indented to align with the label text.

## Accessibility

`<label htmlFor>` + `aria-describedby={helperId}` on the native input. `aria-invalid` when `invalid`, 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 switch uses the semantic color, radius, spacing, and motion tokens.

## Notes

Use this when a label alone is not enough and a short helper line gives useful context. For validation messaging use `switch-with-error`.