# Application Shell 3 - Top Navigation Bar Shell

> An application shell with horizontal top navigation bar featuring dropdown menus, search input, user dropdown, and mobile sheet menu for responsive navigation.

A shadcn/ui block from the [@shadcnblocks](https://shadcnblocks.com) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/shadcnblocks/application-shell3).

- Page, with a live preview: https://shadcn.exchange/r/shadcnblocks/application-shell3
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/shadcnblocks/application-shell3-light-329056f962d46641.png
- Registry item: https://shadcnblocks.com/r/application-shell3.json
- Listed: 2026-10-13, source last changed 2026-10-13

## Install

```bash
npx shadcn@latest add https://shadcnblocks.com/r/application-shell3.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- npm packages: `cn`, `lucide-react`
- Registry items: `avatar`, `button`, `dropdown-menu`, `input`, `scroll-area`, `separator`, `sheet`

## Files

### `block/application-shell3/application-shell3.tsx`

```tsx
"use client";

import {
  BadgeCheck,
  BarChart3,
  Briefcase,
  ChevronDown,
  ChevronsUpDown,
  ClipboardList,
  Clock3,
  FileText,
  Folder,
  Globe2,
  HelpCircle,
  LayoutDashboard,
  LogOut,
  Menu,
  Search,
  Settings,
  Sparkles,
  Star,
  User,
  Users,
} from "lucide-react";
import * as React from "react";
import { cn } from "cn";

import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";

import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { Input } from "@/components/ui/input";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Separator } from "@/components/ui/separator";
import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
  SheetTrigger,
} from "@/components/ui/sheet";

const person1 = {
  name: "Jack Walsh",
  firstName: "Jack",
  lastName: "Walsh",
  initials: "JW",
  email: "jack.walsh@example.com",
  username: "jackwalsh",
  role: "Product Designer",
  company: "Cartwright",
  location: "Brisbane, Australia",
  avatar: "https://cdn.shadcnblocks.com/shadcnblocks/image-set/modern/avatars/avatar1.webp",
};
// Base nav item - used by simple sidebars
type NavItem = {
  label: string;
  icon: React.ComponentType<React.SVGProps<SVGSVGElement>>;
  href: string;
  isActive?: boolean;
  // Optional children for submenus (Sidebar3+)
  children?: NavItem[];
};

// Nav group with optional collapsible state
type NavGroup = {
  title: string;
  items: NavItem[];
  // Optional: default collapsed state (Sidebar2+)
  defaultOpen?: boolean;
};

// User data for footer (Sidebar6+)
type UserData = {
  name: string;
  email: string;
  avatar: string;
};

// Complete sidebar data structure
type SidebarData = {
  // Logo/branding (all sidebars)
  logo: {
    src: string;
    alt: string;
    title: string;
    description: string;
  };
  // Main navigation groups (all sidebars)
  navGroups: NavGroup[];
  // Footer navigation group (all sidebars)
  footerGroup: NavGroup;
  // User data for user footer (Sidebar6+)
  user?: UserData;
  // Workspaces for switcher (Sidebar7+)
  workspaces?: Array<{
    id: string;
    name: string;
    logo: string;
    plan: string;
  }>;
  // Currently active workspace (Sidebar7+)
  activeWorkspace?: string;
};

// Shared sidebar data - works with all sidebar variations
const sidebarData: SidebarData = {
  logo: {
    src: "https://deifkwefumgah.cloudfront.net/shadcnblocks/block/logos/shadcnblocks-logo.svg",
    alt: "Shadcnblocks",
    title: "Shadcnblocks",
    description: "Build your app",
  },
  navGroups: [
    {
      title: "Overview",
      defaultOpen: true,
      items: [
        {
          label: "Dashboard",
          icon: LayoutDashboard,
          href: "#",
          isActive: true,
        },
        { label: "Tasks", icon: ClipboardList, href: "#" },
        { label: "Roadmap", icon: BarChart3, href: "#" },
      ],
    },
    {
      title: "Projects",
      defaultOpen: true,
      items: [
        {
          label: "Active Projects",
          icon: Briefcase,
          href: "#",
          children: [
            { label: "Project Alpha", icon: FileText, href: "#" },
            { label: "Project Beta", icon: FileText, href: "#" },
            { label: "Project Gamma", icon: FileText, href: "#" },
          ],
        },
        {
          label: "Archived",
          icon: Folder,
          href: "#",
          children: [
            { label: "2024 Archive", icon: FileText, href: "#" },
            { label: "2023 Archive", icon: FileText, href: "#" },
          ],
        },
      ],
    },
    {
      title: "Team",
      defaultOpen: false,
      items: [
        { label: "Members", icon: Users, href: "#" },
        { label: "Sprints", icon: Clock3, href: "#" },
        { label: "Approvals", icon: BadgeCheck, href: "#" },
        { label: "Reviews", icon: Star, href: "#" },
      ],
    },
    {
      title: "Workspace",
      defaultOpen: false,
      items: [
        { label: "Integrations", icon: Globe2, href: "#" },
        { label: "Automations", icon: Sparkles, href: "#" },
      ],
    },
  ],
  footerGroup: {
    title: "Support",
    items: [
      { label: "Help Center", icon: HelpCircle, href: "#" },
      { label: "Settings", icon: Settings, href: "#" },
    ],
  },
  user: {
    name: person1.name,
    email: person1.email,
    avatar: person1.avatar,
  },
  workspaces: [
    {
      id: "1",
      name: "Shadcnblocks",
      logo: "https://deifkwefumgah.cloudfront.net/shadcnblocks/block/logos/shadcnblocks-logo.svg",
      plan: "Enterprise",
    },
    {
      id: "2",
      name: "Shadcn Templates",
      logo: "https://deifkwefumgah.cloudfront.net/shadcnblocks/block/logos/shadcnblocks-logo.svg",
      plan: "Startup",
    },
    {
      id: "3",
      name: "Shadcn Components",
      logo: "https://deifkwefumgah.cloudfront.net/shadcnblocks/block/logos/shadcnblocks-logo.svg",
      plan: "Free",
    },
  ],
  activeWorkspace: "1",
};

// Desktop navigation dropdown for each group
const NavDropdown = ({ group }: { group: NavGroup }) => {
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="ghost" className="gap-1">
          {group.title}
          <ChevronDown className="size-3" />
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="start" className="w-48">
        {group.items.map((item) => {
          const Icon = item.icon;
          return (
            <React.Fragment key={item.label}>
              <DropdownMenuItem asChild>
                <a href={item.href} className="flex items-center gap-2">
                  <Icon className="size-4" />
                  {item.label}
                </a>
              </DropdownMenuItem>
              {item.children?.map((child) => {
                const ChildIcon = child.icon;
                return (
                  <DropdownMenuItem key={child.label} asChild className="pl-6">
                    <a href={child.href} className="flex items-center gap-2">
                      <ChildIcon className="size-4" />
                      {child.label}
                    </a>
                  </DropdownMenuItem>
                );
              })}
            </React.Fragment>
          );
        })}
      </DropdownMenuContent>
    </DropdownMenu>
  );
};

// Mobile navigation sheet
const MobileNav = () => {
  return (
    <Sheet>
      <SheetTrigger asChild>
        <Button variant="ghost" size="icon" className="md:hidden">
          <Menu className="size-5" />
        </Button>
      </SheetTrigger>
      <SheetContent side="left" className="w-72 p-0">
        <SheetHeader className="px-4 pt-4">
          <SheetTitle className="flex items-center gap-2">
            <div className="flex aspect-square size-8 items-center justify-center rounded-sm bg-primary">
              <img
                src={sidebarData.logo.src}
                alt={sidebarData.logo.alt}
                className="size-6 text-primary-foreground invert dark:invert-0"
              />
            </div>
            {sidebarData.logo.title}
          </SheetTitle>
        </SheetHeader>
        <ScrollArea className="min-h-0 flex-1">
          <nav className="flex flex-col gap-4 px-4 py-4">
            {sidebarData.navGroups.map((group) => (
              <div key={group.title}>
                <div className="mb-2 text-xs font-medium tracking-wider text-muted-foreground uppercase">
                  {group.title}
                </div>
                <div className="flex flex-col gap-1">
                  {group.items.map((item) => {
                    const Icon = item.icon;
                    return (
                      <React.Fragment key={item.label}>
                        <a
                          href={item.href}
                          className={cn(
                            "flex items-center gap-2 rounded-md px-2 py-1.5 text-sm hover:bg-muted",
                            item.isActive && "bg-muted font-medium",
                          )}
                        >
                          <Icon className="size-4" />
                          {item.label}
                        </a>
                        {item.children?.map((child) => {
                          const ChildIcon = child.icon;
                          return (
                            <a
                              key={child.label}
                              href={child.href}
                              className="flex items-center gap-2 rounded-md py-1.5 pr-2 pl-8 text-sm hover:bg-muted"
                            >
                              <ChildIcon className="size-4" />
                              {child.label}
                            </a>
                          );
                        })}
                      </React.Fragment>
                    );
                  })}
                </div>
              </div>
            ))}
            <Separator />
            <div>
              <div className="mb-2 text-xs font-medium tracking-wider text-muted-foreground uppercase">
                {sidebarData.footerGroup.title}
              </div>
              <div className="flex flex-col gap-1">
                {sidebarData.footerGroup.items.map((item) => {
                  const Icon = item.icon;
                  return (
                    <a
                      key={item.label}
                      href={item.href}
                      className="flex items-center gap-2 rounded-md px-2 py-1.5 text-sm hover:bg-muted"
                    >
                      <Icon className="size-4" />
                      {item.label}
                    </a>
                  );
                })}
              </div>
            </div>
          </nav>
        </ScrollArea>
      </SheetContent>
    </Sheet>
  );
};

// User dropdown
const NavUser = ({ user }: { user: UserData }) => {
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="ghost" className="gap-2 px-2">
          <Avatar className="size-6">
            <AvatarImage src={user.avatar} alt={user.name} />
            <AvatarFallback>
              {user.name
                .split(" ")
                .map((n) => n[0])
                .join("")}
            </AvatarFallback>
          </Avatar>
          <span className="hidden text-sm font-medium md:inline">
            {user.name}
          </span>
          <ChevronsUpDown className="hidden size-4 md:block" />
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end" className="w-56">
        <DropdownMenuLabel className="font-normal">
          <div className="flex flex-col space-y-1">
            <p className="text-sm font-medium">{user.name}</p>
            <p className="text-xs text-muted-foreground">{user.email}</p>
          </div>
        </DropdownMenuLabel>
        <DropdownMenuSeparator />
        <DropdownMenuItem>
          <User className="mr-2 size-4" />
          Account
        </DropdownMenuItem>
        <DropdownMenuSeparator />
        <DropdownMenuItem>
          <LogOut className="mr-2 size-4" />
          Log out
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
};

interface ApplicationShell3Props {
  className?: string;
}

export function ApplicationShell3({ className }: ApplicationShell3Props) {
  return (
    <div className={cn("flex min-h-svh flex-col", className)}>
      {/* Top navigation bar */}
      <header className="sticky top-0 z-50 border-b bg-background">
        <div className="flex h-14 items-center gap-4 px-4 lg:px-6">
          {/* Mobile menu */}
          <MobileNav />

          {/* Logo */}
          <a href="#" className="flex items-center gap-2">
            <div className="flex aspect-square size-8 items-center justify-center rounded-sm bg-primary">
              <img
                src={sidebarData.logo.src}
                alt={sidebarData.logo.alt}
                className="size-6 text-primary-foreground invert dark:invert-0"
              />
            </div>
            <span className="font-semibold">{sidebarData.logo.title}</span>
          </a>

          {/* Desktop navigation */}
          <nav className="ml-4 hidden items-center gap-1 md:flex">
            {sidebarData.navGroups.map((group) => (
              <NavDropdown key={group.title} group={group} />
            ))}
          </nav>

          {/* Right side */}
          <div className="ml-auto flex items-center gap-2">
            <div className="relative hidden md:block">
              <Search className="absolute top-1/2 left-2.5 size-4 -translate-y-1/2 text-muted-foreground" />
              <Input
                type="search"
                placeholder="Search..."
                className="h-9 w-64 pl-8"
              />
            </div>
            <Button variant="ghost" size="icon" className="md:hidden">
              <Search className="size-5" />
            </Button>
            {sidebarData.user && <NavUser user={sidebarData.user} />}
          </div>
        </div>
      </header>

      {/* Main content */}
      <main className="flex flex-1 flex-col gap-4 p-4 lg:p-6">
        <div className="min-h-[100vh] flex-1 rounded-xl bg-muted/50 md:min-h-min" />
      </main>
    </div>
  );
}
```