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hantui

Web3: Wallet & Identityv0.2.0

Network Switcher

Chain dropdown with a switching state and a wrong-network warning.

Installation

CLI

npx shadcn@latest add https://hantui-theta.vercel.app/r/network-switcher.json

Manual

  1. Install the dependencies

    npm install clsx lucide-react motion radix-ui tailwind-merge

  2. Add the shared helpers

    Components use cn() from lib/utils.ts and the motion tokens below. See Installation if you have not set them up yet.

    lib/color.ts
    export type Vec3 = [r: number, g: number, b: number];

/**
 * Parses #rgb, #rrggbb or #rrggbbaa (alpha is ignored) into 0–255 channels.
 * Anything else falls back to black, so a typo never crashes a shader.
 */
export function hexToRgb(hex: string): Vec3 {
  let value = hex.trim().replace(/^#/, "");
  if (value.length === 3 || value.length === 4) value = [...value.slice(0, 3)].map((c) => c + c).join("");
  if (!/^[\da-f]{6}([\da-f]{2})?$/i.test(value)) return [0, 0, 0];
  const n = Number.parseInt(value.slice(0, 6), 16);
  return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
}

/** Hex color as a normalized vec3 (each channel 0–1) for shader uniforms. */
export function hexToVec3(hex: string): Vec3 {
  const [r, g, b] = hexToRgb(hex);
  return [r / 255, g / 255, b / 255];
}

/**
 * Any CSS color the browser understands (hex, rgb(), oklch(), color-mix() or a variable such as
 * `var(--primary)`) as 0–255 channels, computed in the context of `element` so theme variables
 * resolve. Hex takes a fast path; everything else is computed once per call, so cache the result
 * instead of calling this every frame. Browser only; unreadable values fall back to black.
 */
export function cssColorToRgb(color: string, element: Element): Vec3 {
  const value = color.trim();
  if (/^#[\da-f]{3,8}$/i.test(value)) return hexToRgb(value);
  // Children of a canvas still get computed styles, but a regular parent is the safer host.
  const host = element instanceof HTMLCanvasElement ? (element.parentElement ?? document.body) : element;
  const probe = document.createElement("span");
  probe.style.cssText = "position:absolute;width:0;height:0;overflow:hidden;visibility:hidden";
  probe.style.color = value;
  host.appendChild(probe);
  const computed = getComputedStyle(probe).color;
  probe.remove();
  // A 1×1 canvas turns any computed color space (oklch, color(srgb …)) into sRGB bytes.
  const ctx = document.createElement("canvas").getContext("2d", { willReadFrequently: true });
  if (!ctx) return [0, 0, 0];
  ctx.fillStyle = "#000";
  ctx.fillStyle = computed;
  ctx.fillRect(0, 0, 1, 1);
  const [r, g, b] = ctx.getImageData(0, 0, 1, 1).data;
  return [r, g, b];
}

/**
 * Calls `onChange` when the page theme may have changed: a class or data-theme change on <html> or
 * <body> (shadcn's `.dark`, next-themes, a data-theme switch) or a change of the OS color scheme.
 * Resolved colors are cached, so re-resolve them here. Browser only; returns the unsubscribe.
 */
export function observeTheme(onChange: () => void): () => void {
  const observer = new MutationObserver(onChange);
  const options = { attributes: true, attributeFilter: ["class", "data-theme"] };
  observer.observe(document.documentElement, options);
  if (document.body) observer.observe(document.body, options);
  const scheme = window.matchMedia("(prefers-color-scheme: dark)");
  scheme.addEventListener("change", onChange);
  return () => {
    observer.disconnect();
    scheme.removeEventListener("change", onChange);
  };
}

/** `cssColorToRgb` as a normalized vec3 (each channel 0–1) for shader uniforms. */
export function cssColorToVec3(color: string, element: Element): Vec3 {
  const [r, g, b] = cssColorToRgb(color, element);
  return [r / 255, g / 255, b / 255];
}

const toLinear = (c: number) => (c <= 0.04045 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4);
const toGamma = (c: number) => (c <= 0.0031308 ? 12.92 * c : 1.055 * c ** (1 / 2.4) - 0.055);

/** 0–255 sRGB to OKLCH: lightness 0–1, chroma, hue in radians. */
export function rgbToOklch([r, g, b]: Vec3): Vec3 {
  const [lr, lg, lb] = [r, g, b].map((v) => toLinear(v / 255));
  const l = Math.cbrt(0.4122214708 * lr + 0.5363325363 * lg + 0.0514459929 * lb);
  const m = Math.cbrt(0.2119034982 * lr + 0.6806995451 * lg + 0.1073969566 * lb);
  const s = Math.cbrt(0.0883024619 * lr + 0.2817188376 * lg + 0.6299787005 * lb);
  const L = 0.2104542553 * l + 0.793617785 * m - 0.0040720468 * s;
  const A = 1.9779984951 * l - 2.428592205 * m + 0.4505937099 * s;
  const B = 0.0259040371 * l + 0.7827717662 * m - 0.808675766 * s;
  return [L, Math.hypot(A, B), Math.atan2(B, A)];
}

/** OKLCH back to 0–255 sRGB, clamped into gamut. */
export function oklchToRgb([L, C, h]: Vec3): Vec3 {
  const A = C * Math.cos(h);
  const B = C * Math.sin(h);
  const l = (L + 0.3963377774 * A + 0.2158037573 * B) ** 3;
  const m = (L - 0.1055613458 * A - 0.0638541728 * B) ** 3;
  const s = (L - 0.0894841775 * A - 1.291485548 * B) ** 3;
  const rgb = [4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s, -1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s, -0.0041960863 * l - 0.7034186147 * m + 1.707614701 * s];
  return rgb.map((v) => Math.round(Math.min(1, Math.max(0, toGamma(Math.min(1, Math.max(0, v))))) * 255)) as Vec3;
}

/**
 * Mixes two 0–255 colors in OKLCH, taking the short way around the hue circle, so midpoints keep
 * their chroma instead of turning muddy the way an RGB mix does.
 */
export function mixOklch(a: Vec3, b: Vec3, t: number): Vec3 {
  const [L1, C1, h1] = rgbToOklch(a);
  const [L2, C2, h2] = rgbToOklch(b);
  // A near-gray end has no meaningful hue: borrow the other end's.
  const ha = C1 < 0.02 ? h2 : h1;
  const hb = C2 < 0.02 ? h1 : h2;
  let dh = hb - ha;
  if (dh > Math.PI) dh -= Math.PI * 2;
  if (dh < -Math.PI) dh += Math.PI * 2;
  return oklchToRgb([L1 + (L2 - L1) * t, C1 + (C2 - C1) * t, ha + dh * t]);
}
    lib/motion.ts
    import type { Transition, Variants } from "motion/react";

/** Durations in seconds. */
export const duration = {
  instant: 0.1,
  quick: 0.18,
  base: 0.28,
  slow: 0.45,
} as const;

/** Cubic-bezier curves. */
export const ease = {
  /** Entering, UI response. */
  out: [0.22, 1, 0.36, 1],
  /** Moving on screen. */
  inOut: [0.65, 0, 0.35, 1],
  /** Sheets and the mobile menu. */
  drawer: [0.32, 0.72, 0, 1],
} as const;

/** Everyday UI: presses, icon swaps, popovers and modals. Exits run at `exitFactor` of the enter. */
export const ui = {
  press: { scale: 0.96, duration: 0.12 },
  icon: { type: "spring", duration: 0.3, bounce: 0 },
  popover: { duration: 0.18, ease: ease.out },
  modal: { duration: 0.24, ease: ease.out },
  exitFactor: 0.6,
} as const;

/** Once-per-visit motion on the landing page: hero letters, the reel and the afterimage. */
export const kinetic = {
  heroLetter: { duration: 0.6, ease: ease.out },
  /** Delay per letter, eased so the wave slows toward the end. */
  heroStep: 0.035,
  reelSwap: { type: "spring", duration: 0.5, bounce: 0.1 },
  /** Two afterimages: lag in seconds and opacity of each. */
  ghost: { lag: [0.04, 0.09], opacity: [0.14, 0.06] },
} as const;

/** Spring presets. */
export const spring = {
  snappy: { type: "spring", stiffness: 500, damping: 30 },
  smooth: { type: "spring", stiffness: 260, damping: 26 },
  bouncy: { type: "spring", stiffness: 300, damping: 15 },
} as const satisfies Record<string, Transition>;

/** Stagger between siblings, in seconds (0.03–0.06). */
export const stagger = {
  tight: 0.03,
  base: 0.045,
  loose: 0.06,
} as const;

/** Blur + fade + y-offset. Falls back to a plain fade under reduced motion. */
export function enterVariants(reduceMotion?: boolean | null, y = 8): Variants {
  if (reduceMotion) {
    return {
      hidden: { opacity: 0 },
      visible: { opacity: 1, transition: { duration: duration.base } },
      exit: { opacity: 0, transition: { duration: duration.quick } },
    };
  }
  return {
    hidden: { opacity: 0, y, filter: "blur(4px)" },
    visible: {
      opacity: 1,
      y: 0,
      filter: "blur(0px)",
      transition: { duration: duration.base, ease: ease.out },
    },
    exit: {
      opacity: 0,
      y: -y / 2,
      filter: "blur(4px)",
      transition: { duration: duration.quick, ease: ease.out },
    },
  };
}

/** Scale 0.96 → 1 for popovers, menus and dialogs. */
export function overlayVariants(reduceMotion?: boolean | null): Variants {
  if (reduceMotion) {
    return {
      hidden: { opacity: 0 },
      visible: { opacity: 1, transition: { duration: duration.quick } },
      exit: { opacity: 0, transition: { duration: duration.instant } },
    };
  }
  return {
    hidden: { opacity: 0, scale: 0.96, filter: "blur(2px)" },
    visible: {
      opacity: 1,
      scale: 1,
      filter: "blur(0px)",
      transition: { duration: duration.quick, ease: ease.out },
    },
    exit: {
      opacity: 0,
      scale: 0.96,
      filter: "blur(2px)",
      transition: { duration: duration.instant + 0.02, ease: ease.out },
    },
  };
}

/** Parent variants that stagger their children in. */
export function staggerVariants(gap: number = stagger.base, delayChildren = 0): Variants {
  return {
    hidden: {},
    visible: { transition: { staggerChildren: gap, delayChildren } },
    exit: { transition: { staggerChildren: gap / 2, staggerDirection: -1 } },
  };
}
    lib/web3/icons.tsx
    "use client";

import { useId, type ComponentProps } from "react";
import { hexToRgb } from "@/lib/color";
import { cn } from "@/lib/utils";

/**
 * Generated avatars for tokens, chains and accounts. No third-party logos are bundled:
 * pass `iconUrl` (tokens, chains) or `src` (accounts) to show your own artwork.
 */

const PALETTE = ["#6366F1", "#2563EB", "#0EA5E9", "#14B8A6", "#16A34A", "#F59E0B", "#EF4444", "#EC4899", "#8B5CF6", "#64748B"];

function hashString(value: string) {
  let hash = 0x811c9dc5;
  for (const char of value) hash = Math.imul(hash ^ char.charCodeAt(0), 0x01000193);
  return hash >>> 0;
}

/** Text color with enough contrast on a fill (relative luminance threshold). */
function inkFor(fill: string) {
  const [r, g, b] = hexToRgb(fill).map((c) => {
    const s = c / 255;
    return s <= 0.03928 ? s / 12.92 : ((s + 0.055) / 1.055) ** 2.4;
  });
  return 0.2126 * r + 0.7152 * g + 0.0722 * b > 0.45 ? "#09090B" : "#FFFFFF";
}

function Monogram({ text, fill, size, shape, className }: { text: string; fill: string; size: number; shape: "circle" | "squircle"; className?: string }) {
  const letters = text.slice(0, 4);
  const fontSize = letters.length <= 2 ? 13 : letters.length === 3 ? 10 : 8.5;
  return (
    <svg width={size} height={size} viewBox="0 0 32 32" aria-hidden="true" className={cn("shrink-0", className)}>
      {shape === "circle" ? <circle cx="16" cy="16" r="16" fill={fill} /> : <rect width="32" height="32" rx="9" fill={fill} />}
      <text
        x="16"
        y="16"
        dy="0.35em"
        textAnchor="middle"
        fontSize={fontSize}
        fontWeight={700}
        fill={inkFor(fill)}
        style={{ fontFamily: "inherit", letterSpacing: letters.length > 2 ? "-0.02em" : undefined }}
      >
        {letters}
      </text>
    </svg>
  );
}

function ImageIcon({ src, size, rounded, className }: { src: string; size: number; rounded: string; className?: string }) {
  // eslint-disable-next-line @next/next/no-img-element -- consumers pass arbitrary logo URLs
  return <img src={src} alt="" width={size} height={size} className={cn("shrink-0 object-cover", rounded, className)} />;
}

export interface TokenIconProps {
  token: { symbol: string; iconUrl?: string; color?: string };
  /** Pixel size. @default 24 */
  size?: number;
  className?: string;
}

/** A token's logo, or a colored circle with its symbol. Decorative: pair it with visible text. */
export function TokenIcon({ token, size = 24, className }: TokenIconProps) {
  if (token.iconUrl) return <ImageIcon src={token.iconUrl} size={size} rounded="rounded-full" className={className} />;
  const fill = token.color ?? PALETTE[hashString(token.symbol) % PALETTE.length];
  return <Monogram text={token.symbol} fill={fill} size={size} shape="circle" className={className} />;
}

export interface ChainIconProps {
  chain: { name: string; shortName?: string; iconUrl?: string; color?: string };
  /** Pixel size. @default 20 */
  size?: number;
  className?: string;
}

/** A chain's logo, or a rounded square with its initial. Decorative: pair it with visible text. */
export function ChainIcon({ chain, size = 20, className }: ChainIconProps) {
  if (chain.iconUrl) return <ImageIcon src={chain.iconUrl} size={size} rounded="rounded-[28%]" className={className} />;
  const fill = chain.color ?? PALETTE[hashString(chain.name) % PALETTE.length];
  return <Monogram text={(chain.shortName ?? chain.name).charAt(0)} fill={fill} size={size} shape="squircle" className={className} />;
}

export interface WalletIconProps {
  wallet: { name: string; iconUrl?: string; color?: string };
  /** Pixel size. @default 32 */
  size?: number;
  className?: string;
}

/** A wallet's logo, or a rounded square with its initial. Decorative: pair it with visible text. */
export function WalletIcon({ wallet, size = 32, className }: WalletIconProps) {
  if (wallet.iconUrl) return <ImageIcon src={wallet.iconUrl} size={size} rounded="rounded-[28%]" className={className} />;
  const fill = wallet.color ?? PALETTE[hashString(wallet.name) % PALETTE.length];
  return <Monogram text={wallet.name.charAt(0)} fill={fill} size={size} shape="squircle" className={className} />;
}

export interface AddressAvatarProps extends Omit<ComponentProps<"svg">, "children"> {
  address: string;
  /** Pixel size. @default 24 */
  size?: number;
}

/** A deterministic gradient avatar for an address: same address, same avatar, on every device. */
export function AddressAvatar({ address, size = 24, className, ...props }: AddressAvatarProps) {
  const id = useId();
  const hex = address.toLowerCase().replace(/^0x/, "").padEnd(40, "0");
  const byte = (i: number) => Number.parseInt(hex.slice(i * 2, i * 2 + 2), 16) || 0;
  const hue = Math.round((byte(0) / 255) * 360);
  const hue2 = (hue + 40 + Math.round((byte(1) / 255) * 120)) % 360;
  const angle = Math.round((byte(2) / 255) * 360);
  return (
    <svg width={size} height={size} viewBox="0 0 32 32" aria-hidden="true" className={cn("shrink-0 rounded-full", className)} {...props}>
      <defs>
        <linearGradient id={`${id}g`} gradientTransform={`rotate(${angle} 0.5 0.5)`}>
          <stop offset="0" stopColor={`hsl(${hue} 85% 64%)`} />
          <stop offset="1" stopColor={`hsl(${hue2} 80% 52%)`} />
        </linearGradient>
        <clipPath id={`${id}c`}>
          <circle cx="16" cy="16" r="16" />
        </clipPath>
      </defs>
      <g clipPath={`url(#${id}c)`}>
        <rect width="32" height="32" fill={`url(#${id}g)`} />
        <circle cx={6 + (byte(3) % 20)} cy={6 + (byte(4) % 20)} r={6 + (byte(5) % 6)} fill="#fff" opacity="0.32" />
        <circle cx={6 + (byte(6) % 20)} cy={6 + (byte(7) % 20)} r={3 + (byte(8) % 5)} fill="#fff" opacity="0.22" />
      </g>
    </svg>
  );
}
    lib/web3/types.ts
    /** Shapes the web3 components accept. Your own token and chain objects only need these fields. */

export interface Token {
  symbol: string;
  name?: string;
  /** Token decimals: 18 for ETH, 6 for USDC. Amounts are bigint in these units. */
  decimals: number;
  address?: string;
  /** Logo URL. Without one, a generated avatar (colored circle and symbol) is shown. */
  iconUrl?: string;
  /** Avatar color for the generated icon. Picked from the symbol when omitted. */
  color?: string;
  /** USD price as a bigint with USD_DECIMALS (8) decimals. */
  price?: bigint;
}

export interface Chain {
  id: number;
  name: string;
  shortName?: string;
  iconUrl?: string;
  color?: string;
  /** Block explorer base URL without a trailing slash, e.g. https://etherscan.io */
  explorerUrl?: string;
  nativeSymbol?: string;
}

export interface WalletOption {
  id: string;
  name: string;
  /** Logo URL. Without one, a generated squircle with the wallet's initial is shown. */
  iconUrl?: string;
  color?: string;
  /** Shows a "Recent" badge. */
  recent?: boolean;
  /** The wallet is detected in this browser. */
  installed?: boolean;
  /** Connects by scanning a QR code with a phone instead of a browser extension. */
  qr?: boolean;
  /** Short helper line under the name. */
  description?: string;
}

/** Lifecycle of anything the user signs: every state gets its own visual. */
export type TxStatus = "idle" | "awaiting-signature" | "pending" | "confirmed" | "failed";

/** Explorer URL for an address or transaction, or undefined without an explorer. */
export function explorerLink(explorerUrl: string | undefined, kind: "address" | "tx", value: string) {
  return explorerUrl ? `${explorerUrl.replace(/\/$/, "")}/${kind}/${value}` : undefined;
}

  3. Add the theme tokens

    This component uses --warning, which shadcn does not define by default. Add it to your global CSS:

    app/globals.css
    :root {
  --warning: #b45309;
}

.dark {
  --warning: #fbbf24;
}

@theme inline {
  --color-warning: var(--warning);
}

  4. Copy the source

    components/ui/network-switcher/network-switcher.tsx
    "use client";

import type { ComponentProps } from "react";
import { DropdownMenu } from "radix-ui";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { AlertTriangle, Check, ChevronDown } from "lucide-react";
import { cn } from "@/lib/utils";
import { duration, ease, overlayVariants } from "@/lib/motion";
import { ChainIcon } from "@/lib/web3/icons";
import type { Chain } from "@/lib/web3/types";

export interface NetworkSwitcherProps
  extends Omit<ComponentProps<"div">, "children" | "onAnimationStart" | "onDrag" | "onDragStart" | "onDragEnd"> {
  /** Networks your app supports. */
  chains: Chain[];
  /** The wallet's current chain id. An id missing from `chains` shows the wrong-network state. */
  chainId?: number;
  /** Called with the chain id the user picked. */
  onSwitch: (chainId: number) => void;
  /** Chain id a switch is in progress to; shows the switching state. */
  switchingTo?: number;
  /** Error from the last switch attempt, e.g. "Switch rejected in your wallet." */
  error?: string;
  /** Name of the unsupported network, shown in the warning. */
  unsupportedChainName?: string;
  /** Chain suggested by the warning banner. @default chains[0] */
  recommendedChainId?: number;
  /** Show the warning banner on a wrong network or error. @default true */
  showBanner?: boolean;
}

const Spinner = ({ className }: { className?: string }) => (
  <svg className={cn("size-4 animate-spin motion-reduce:animate-pulse", className)} viewBox="0 0 24 24" fill="none" aria-hidden="true">
    <circle cx="12" cy="12" r="9" stroke="currentColor" strokeOpacity="0.25" strokeWidth="2.5" />
    <path d="M21 12a9 9 0 0 0-9-9" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" />
  </svg>
);

const warningText = "text-[color-mix(in_oklab,var(--warning)_55%,var(--foreground))]";

export function NetworkSwitcher({
  chains,
  chainId,
  onSwitch,
  switchingTo,
  error,
  unsupportedChainName,
  recommendedChainId,
  showBanner = true,
  className,
  ...props
}: NetworkSwitcherProps) {
  const reduceMotion = useReducedMotion() ?? false;
  const current = chains.find((c) => c.id === chainId);
  const target = chains.find((c) => c.id === switchingTo);
  const recommended = chains.find((c) => c.id === recommendedChainId) ?? chains[0];
  const switching = target !== undefined;
  const wrongNetwork = chainId !== undefined && !current;
  const bannerOpen = showBanner && !switching && (wrongNetwork || Boolean(error));
  const contentKey = switching ? `switching-${target.id}` : wrongNetwork ? "wrong" : (current?.id ?? "none");

  return (
    <div className={cn("flex flex-col items-start gap-3", className)} {...props}>
      <DropdownMenu.Root>
        <DropdownMenu.Trigger
          aria-busy={switching || undefined}
          className={cn(
            "group inline-flex h-10 cursor-pointer items-center gap-2 rounded-full border pr-3 pl-1.5 text-sm font-medium outline-none select-none",
            "transition-[background-color,border-color,color] duration-200 focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background",
            wrongNetwork && !switching
              ? cn("border-warning/40 bg-warning/10 pl-3", warningText)
              : "border-border bg-background text-foreground shadow-xs hover:bg-surface",
          )}
        >
          <AnimatePresence mode="popLayout" initial={false}>
            <motion.span
              key={contentKey}
              className="flex items-center gap-2"
              initial={reduceMotion ? { opacity: 0 } : { opacity: 0, y: 6, filter: "blur(4px)" }}
              animate={{ opacity: 1, y: 0, filter: "blur(0px)" }}
              exit={reduceMotion ? { opacity: 0 } : { opacity: 0, y: -6, filter: "blur(4px)" }}
              transition={{ duration: duration.quick, ease: ease.out }}
            >
              {switching ? (
                <>
                  <span className="grid size-7 place-items-center">
                    <Spinner className="text-muted-foreground" />
                  </span>
                  Switching to {target.shortName ?? target.name}…
                </>
              ) : wrongNetwork ? (
                <>
                  <AlertTriangle className="size-4" aria-hidden="true" />
                  Wrong network
                </>
              ) : current ? (
                <>
                  <ChainIcon chain={current} size={28} />
                  <span>
                    <span className="sr-only">Network: </span>
                    {current.shortName ?? current.name}
                  </span>
                </>
              ) : (
                <span className="pl-1.5">Select network</span>
              )}
            </motion.span>
          </AnimatePresence>
          <ChevronDown className="size-4 opacity-60 transition-transform duration-200 group-data-[state=open]:rotate-180" aria-hidden="true" />
        </DropdownMenu.Trigger>
        <DropdownMenu.Portal>
          <DropdownMenu.Content align="start" sideOffset={8} collisionPadding={12} asChild>
            <motion.div
              variants={overlayVariants(reduceMotion)}
              initial="hidden"
              animate="visible"
              className="z-50 w-60 origin-[var(--radix-dropdown-menu-content-transform-origin)] rounded-xl border border-border bg-popover p-1.5 text-popover-foreground shadow-lg outline-none"
            >
              <DropdownMenu.Label className="px-2.5 pt-1.5 pb-2 text-xs font-medium text-muted-foreground">Networks</DropdownMenu.Label>
              <DropdownMenu.RadioGroup value={chainId !== undefined ? String(chainId) : undefined} onValueChange={(v) => onSwitch(Number(v))}>
                {chains.map((chain) => {
                  const active = chain.id === chainId;
                  const pending = chain.id === switchingTo;
                  return (
                    <DropdownMenu.RadioItem
                      key={chain.id}
                      value={String(chain.id)}
                      disabled={switching}
                      className="flex h-10 cursor-pointer items-center gap-3 rounded-lg px-2.5 text-sm text-foreground outline-none transition-colors data-[disabled]:cursor-progress data-[highlighted]:bg-accent"
                    >
                      <ChainIcon chain={chain} size={22} />
                      <span className="flex-1 truncate">{chain.name}</span>
                      {pending ? (
                        <Spinner className="text-muted-foreground" />
                      ) : active ? (
                        <Check className="size-4 text-foreground" aria-hidden="true" />
                      ) : null}
                    </DropdownMenu.RadioItem>
                  );
                })}
              </DropdownMenu.RadioGroup>
            </motion.div>
          </DropdownMenu.Content>
        </DropdownMenu.Portal>
      </DropdownMenu.Root>

      {/* Height opens with the grid-rows trick, so nothing below jumps. */}
      <div
        className={cn(
          "grid w-full transition-[grid-template-rows,opacity] duration-300 ease-out motion-reduce:transition-none",
          bannerOpen ? "grid-rows-[1fr] opacity-100" : "grid-rows-[0fr] opacity-0",
        )}
        aria-hidden={!bannerOpen}
        inert={!bannerOpen}
      >
        <div className="min-h-0 overflow-hidden">
          <div
            role={bannerOpen ? "alert" : undefined}
            className={cn(
              "flex flex-col gap-3 rounded-xl border p-3.5 text-[13px] leading-5 sm:flex-row sm:items-center",
              error ? "border-destructive/25 bg-destructive/6" : "border-warning/35 bg-warning/8",
            )}
          >
            <AlertTriangle
              className={cn("size-4 shrink-0", error ? "text-[color-mix(in_oklab,var(--destructive)_80%,var(--foreground))]" : warningText)}
              aria-hidden="true"
            />
            <p className="flex-1 text-foreground">
              {error ? (
                error
              ) : (
                <>
                  <span className="font-medium">
                    {unsupportedChainName ? `${unsupportedChainName} isn't supported.` : "This network isn't supported."}
                  </span>{" "}
                  Switch to {recommended?.name} to continue.
                </>
              )}
            </p>
            {recommended ? (
              <button
                type="button"
                onClick={() => onSwitch(recommended.id)}
                className="relative after:absolute after:inset-x-0 after:-inset-y-0.5 inline-flex h-9 shrink-0 cursor-pointer items-center gap-2 self-start rounded-lg bg-foreground px-3 text-[13px] font-medium text-background outline-none transition-colors hover:bg-foreground/90 focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 sm:self-auto"
              >
                <ChainIcon chain={recommended} size={18} />
                {error ? "Try again" : `Switch to ${recommended.shortName ?? recommended.name}`}
              </button>
            ) : null}
          </div>
        </div>
      </div>
      <span className="sr-only" role="status" aria-live="polite">
        {switching ? `Switching to ${target.name}` : current ? `Connected to ${current.name}` : ""}
      </span>
    </div>
  );
}

Usage

import { NetworkSwitcher } from "@/components/ui/network-switcher/network-switcher";

<NetworkSwitcher
  chains={[{ id: 1, name: "Ethereum" }, { id: 8453, name: "Base" }]}
  chainId={walletChainId}
  switchingTo={pendingChainId}
  error={switchError}
  onSwitch={(id) => switchChain(id)}
/>

API reference

PropTypeDefaultDescription
chains*Chain[]–Networks your app supports.
chainIdnumber–The wallet's current chain id. An id missing from `chains` shows the wrong-network state.
onSwitch*(chainId: number) => void–Called with the chain id the user picked.
switchingTonumber–Chain id a switch is in progress to; shows the switching state.
errorstring–Error from the last switch attempt, e.g. "Switch rejected in your wallet."
unsupportedChainNamestring–Name of the unsupported network, shown in the warning.
recommendedChainIdnumberchains[0]Chain suggested by the warning banner.
showBannerbooleantrueShow the warning banner on a wrong network or error.

Also accepts every native <div> attribute, including ref and className.

  • A chainId that isn't in chains is treated as an unsupported network. Pass unsupportedChainName to name it in the warning.
  • Network avatars are generated from the chain name and color. Pass iconUrl on a chain to use its real logo.

Accessibility

  • The trigger opens a menu of networks as radio items (arrow keys to move, Enter to pick), with the current network checked.
  • The trigger's name reflects the state ("Network: Base", "Switching to Base", "Wrong network"), and switching sets aria-busy.
  • The wrong-network and error banner is announced as an alert, and its action button switches to the recommended network.
  • The banner opens with the grid-rows height trick, so content below never jumps. Reduced motion removes the transition.