kbar

kbar is a simple plug-n-play React component to add a fast, portable, and extensible command + k interface to your site.

Background

Command + k interfaces are used to create a web experience where any type of action users would be able to do via clicking can be done through a command menu.

With macOS's Spotlight and Linear's command + k experience in mind, kbar aims to be a simple abstraction to add a fast and extensible command + k menu to your site.

Features

Built in animations and fully customizable components
Keyboard navigation support; e.g. control + n or control + p for the navigation wizards
Keyboard shortcuts support for registering keystrokes to specific actions; e.g. hit t for Twitter, hit ? to immediate bring up documentation search
Nested actions enable creation of rich navigation experiences; e.g. hit backspace to navigate to the previous action
Performance as a first class priority; tens of thousands of actions? No problem.
History management; easily add undo and redo to each action
Built in screen reader support
A simple data structure which enables anyone to easily build their own custom components

Usage

Have a fully functioning command menu for your site in minutes. First, install kbar.

npm install kbar

There is a single provider which you will wrap your app around; you do not have to wrap your entire app; however, there are no performance implications by doing so.

// app.tsx
import { KBarProvider } from "kbar";

function MyApp() {
  return <KBarProvider>// ...</KBarProvider>;
}

Let's add a few default actions. Actions are the core of kbar – an action define what to execute when a user selects it.

  const actions = [
    {
      id: "blog",
      name: "Blog",
      shortcut: ["b"],
      keywords: "writing words",
      perform: () => (window.location.pathname = "blog"),
    },
    {
      id: "contact",
      name: "Contact",
      shortcut: ["c"],
      keywords: "email",
      perform: () => (window.location.pathname = "contact"),
    },
  ]

  return (
    <KBarProvider actions={actions}>
      // ...
    </KBarProvider>
  );
}

Next, we will pull in the provided UI components from kbar:

// app.tsx
import {
  KBarProvider,
  KBarPortal,
  KBarPositioner,
  KBarAnimator,
  KBarSearch,
  useMatches,
  NO_GROUP
} from "kbar";

// ...
  return (
    <KBarProvider actions={actions}>
      <KBarPortal> // Renders the content outside the root node
        <KBarPositioner> // Centers the content
          <KBarAnimator> // Handles the show/hide and height animations
            <KBarSearch /> // Search input
          </KBarAnimator>
        </KBarPositioner>
      </KBarPortal>
      <MyApp />
    </KBarProvider>;
  );
}

At this point hitting cmd+k (macOS) or ctrl+k (Linux/Windows) will animate in a search input and nothing more.

kbar provides a few utilities to render a performant list of search results.

useMatches at its core returns a flattened list of results and group name based on the current search query; i.e. ["Section name", Action, Action, "Another section name", Action, Action]
KBarResults renders a performant virtualized list of these results

Combine the two utilities to create a powerful search interface:

import {
  // ...
  KBarResults,
  useMatches,
  NO_GROUP,
} from "kbar";

// ...
// <KBarAnimator>
//   <KBarSearch />
<RenderResults />;
// ...

function RenderResults() {
  const { results } = useMatches();

  return (
    <KBarResults
      items={results}
      onRender={({ item, active }) =>
        typeof item === "string" ? (
          <div>{item}</div>
        ) : (
          <div
            style={{
              background: active ? "#eee" : "transparent",
            }}
          >
            {item.name}
          </div>
        )
      }
    />
  );
}

Hit cmd+k (macOS) or ctrl+k (Linux/Windows) and you should see a primitive command menu. kbar allows you to have full control over all aspects of your command menu – refer to the docs to get an understanding of further capabilities. Looking forward to see what you build.

Used by

Listed are some of the various usages of kbar in the wild – check them out! Create a PR to add your site below.

Contributing to kbar

Contributions are welcome!

New features

Please open a new issue so we can discuss prior to moving forward.

Bug fixes

Please open a new Pull Request for the given bug fix.

Nits and spelling mistakes

Please open a new issue for things like spelling mistakes and README tweaks – we will group the issues together and tackle them as a group. Please do not create a PR for it!

careless10/kbar