Back Button

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import type { ButtonHTMLAttributes, AnchorHTMLAttributes, ReactNode } from "react";

/* DevSnips React — BackButton
 * Returns to the previous view. Leading arrow-left + label. Renders a
 * button (onClick) or a link (href). Icon-only mode needs a label for an
 * accessible name.
 */

export type ButtonSize = "xs" | "sm" | "md" | "lg" | "xl";
export type BackVariant = "ghost" | "outline";

export interface BackButtonProps
  extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "href"> {
  href?: string;
  variant?: BackVariant;
  size?: ButtonSize;
  showLabel?: boolean;
}

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

const SIZES: Record<ButtonSize, string> = {
  xs: "h-7 gap-1 px-2 text-xs [&_svg]:size-[14px]",
  sm: "h-8 gap-1.5 px-3 text-xs [&_svg]:size-[14px]",
  md: "h-9 gap-2 px-3.5 text-[13px] [&_svg]:size-4",
  lg: "h-10 gap-2 px-4 text-[13px] [&_svg]:size-[18px]",
  xl: "h-11 gap-2 px-5 text-sm [&_svg]:size-5",
};

const VARIANTS: Record<BackVariant, string> = {
  ghost: "border-transparent bg-transparent text-[var(--ds-color-foreground)] hover:bg-[var(--ds-color-surface-hover)] active:bg-[var(--ds-color-surface-active)]",
  outline: "border-[var(--ds-color-border-strong)] bg-transparent text-[var(--ds-color-foreground)] hover:bg-[var(--ds-color-surface-hover)] active:bg-[var(--ds-color-surface-active)]",
};

const ICON_ONLY: Record<ButtonSize, string> = {
  xs: "h-7 w-7 px-0 [&_svg]:size-[14px]",
  sm: "h-8 w-8 px-0 [&_svg]:size-[14px]",
  md: "h-9 w-9 px-0 [&_svg]:size-4",
  lg: "h-10 w-10 px-0 [&_svg]:size-[18px]",
  xl: "h-11 w-11 px-0 [&_svg]:size-5",
};

function ArrowLeft() {
  return (
    <svg className="h-[1em] w-[1em] shrink-0" viewBox="0 0 24 24" fill="none" aria-hidden="true">
      <path d="M19 12H5" stroke="currentColor" strokeWidth="1.75" strokeLinecap="round" strokeLinejoin="round" />
      <path d="m11 19-7-7 7-7" stroke="currentColor" strokeWidth="1.75" strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  );
}

export function BackButton({
  children = "Back",
  href,
  variant = "ghost",
  size = "md",
  showLabel = true,
  className,
  type = "button",
  onClick,
  ...rest
}: BackButtonProps) {
  const cls = cx(
    "inline-flex select-none items-center justify-center whitespace-nowrap rounded-[var(--ds-radius-sm)] border font-medium leading-none transition-colors duration-150 ease-out motion-reduce:transition-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50",
    VARIANTS[variant],
    showLabel ? SIZES[size] : ICON_ONLY[size],
    className,
  );
  const content = (
    <>
      <ArrowLeft />
      {showLabel && <span>{children}</span>}
    </>
  );
  if (href) {
    return <a href={href} className={cls} {...rest}>{content}</a>;
  }
  return (
    <button
      type={type}
      className={cls}
      aria-label={showLabel ? undefined : (typeof children === "string" ? children : "Back")}
      onClick={onClick}
      {...rest}
    >
      {content}
    </button>
  );
}

export default BackButton;

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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.
 */

function cx(...parts) {
  return parts.filter(Boolean).join(" ");
}
const SIZES = {
  xs: "h-7 gap-1 px-2 text-xs [&_svg]:size-[14px]",
  sm: "h-8 gap-1.5 px-3 text-xs [&_svg]:size-[14px]",
  md: "h-9 gap-2 px-3.5 text-[13px] [&_svg]:size-4",
  lg: "h-10 gap-2 px-4 text-[13px] [&_svg]:size-[18px]",
  xl: "h-11 gap-2 px-5 text-sm [&_svg]:size-5"
};
const VARIANTS = {
  ghost: "border-transparent bg-transparent text-[var(--ds-color-foreground)] hover:bg-[var(--ds-color-surface-hover)] active:bg-[var(--ds-color-surface-active)]",
  outline: "border-[var(--ds-color-border-strong)] bg-transparent text-[var(--ds-color-foreground)] hover:bg-[var(--ds-color-surface-hover)] active:bg-[var(--ds-color-surface-active)]"
};
const ICON_ONLY = {
  xs: "h-7 w-7 px-0 [&_svg]:size-[14px]",
  sm: "h-8 w-8 px-0 [&_svg]:size-[14px]",
  md: "h-9 w-9 px-0 [&_svg]:size-4",
  lg: "h-10 w-10 px-0 [&_svg]:size-[18px]",
  xl: "h-11 w-11 px-0 [&_svg]:size-5"
};
function ArrowLeft() {
  return <svg className="h-[1em] w-[1em] shrink-0" viewBox="0 0 24 24" fill="none" aria-hidden="true">
      <path d="M19 12H5" stroke="currentColor" strokeWidth="1.75" strokeLinecap="round" strokeLinejoin="round" />
      <path d="m11 19-7-7 7-7" stroke="currentColor" strokeWidth="1.75" strokeLinecap="round" strokeLinejoin="round" />
    </svg>;
}
export function BackButton({
  children = "Back",
  href,
  variant = "ghost",
  size = "md",
  showLabel = true,
  className,
  type = "button",
  onClick,
  ...rest
}) {
  const cls = cx(
    "inline-flex select-none items-center justify-center whitespace-nowrap rounded-[var(--ds-radius-sm)] border font-medium leading-none transition-colors duration-150 ease-out motion-reduce:transition-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50",
    VARIANTS[variant],
    showLabel ? SIZES[size] : ICON_ONLY[size],
    className
  );
  const content = <>
      <ArrowLeft />
      {showLabel && <span>{children}</span>}
    </>;
  if (href) {
    return <a href={href} className={cls} {...rest}>{content}</a>;
  }
  return <button
    type={type}
    className={cls}
    aria-label={showLabel ? undefined : typeof children === "string" ? children : "Back"}
    onClick={onClick}
    {...rest}
  >
      {content}
    </button>;
}

export default BackButton;

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# Back Button

Returns to the previous view. Leading arrow-left + label. Renders as a button (onClick, default) or a link (href). Icon-only mode needs a `label` prop for the accessible name.

## Installation

This component requires **React** and **Tailwind CSS**. Drop `code.tsx` (or `code.jsx` for JavaScript projects) into your project. Tailwind utility classes are included directly in the component, so no separate CSS file is required.

The component consumes the DevSnips semantic design tokens through Tailwind arbitrary values (for example `bg-[var(--ds-color-primary)]`). Define the `--ds-*` tokens once in your theme — see [React/DESIGN_TOKENS.md](../../../DESIGN_TOKENS.md) for the full token spec.

## Usage

```tsx
<BackButton onClick={goBack}>Back to list</BackButton>
<BackButton href="/projects" showLabel={false} label="Back" />
```

## 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.

## Props

| Prop | Type | Default |
|---|---|---|
| `children` | `ReactNode` | `"Back"` |
| `href` | `string` | — (renders `<a>` when set) |
| `variant` | `ghost \| outline` | `ghost` |
| `size` | `ButtonSize` | `md` |
| `showLabel` | `boolean` | `true` (icon-only when false; `children` becomes `aria-label`) |

Plus all native button/anchor attributes depending on mode.

## Variants

ghost (default) · outline.

## Sizes

xs (28px) · sm (32px) · **md (36px, default)** · lg (40px) · xl (44px). Horizontal padding scales 8 → 20px; icons scale 14 → 20px.

## States

default · hover · focus-visible · disabled (reduced opacity).

## Accessibility

Renders a native `<button>`. Focus-visible ring uses `color.focus-ring`. Loading sets `aria-busy` and disables to prevent double-submit. Disabled never removes the affordance (reduced opacity, not hidden). Meets the 44px touch target at lg/xl. Icon-only mode uses `children` (or "Back") as `aria-label` so the control stays named. Link mode renders a real `<a href>`.

## Styling

Tailwind classes are included directly in the component and consume the DevSnips semantic design tokens (`--ds-*`) via arbitrary values. The button themes with the surface automatically in light and dark mode. No component-specific CSS file is needed.

## Design Tokens

See [React/DESIGN_TOKENS.md](../../../DESIGN_TOKENS.md) for the authoritative token specification. This button uses the semantic color, radius, and motion tokens; define them once in your project theme and every button in the family stays in sync.

## Notes

Use above page content (back to list) or as a wizard footer action. For app-internal back, prefer onClick; for real navigation, pass `href`.