Need help with flight?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

6.6K Stars 569 Forks MIT License 500 Commits 9 Opened issues


A component-based, event-driven JavaScript framework from Twitter

Services available


Need anything else?

Contributors list

Please note

Flight is not under active development. New pull requests will not be accepted unless they fix core bugs or security issues.


Build Status Gitter

Flight is a lightweight, component-based, event-driven JavaScript framework that maps behavior to DOM nodes. It was created at Twitter, and is used by the and TweetDeck web applications.


A simple example of a Flight component.

/* Component definition */

var Inbox = flight.component(inbox);

function inbox() { this.doSomething = function() { /* ... / } this.doSomethingElse = function() { / ... */ }

// after initializing the component this.after('initialize', function() { this.on('click', this.doSomething); this.on('mouseover', this.doSomethingElse); }); }

/* Attach the component to a DOM node */



Quick start using the pre-built library (a UMD bundle). It exposes all of its modules as properties of a global variable,


Using npm:

npm install --save flightjs

Using Bower:

bower install --save flight

You will have to load jQuery in your application.

Why Flight?

Flight is only ~5K minified and gzipped. It's built upon jQuery.

Flight components are highly portable and easily testable. This is because a Flight component (and its API) is entirely decoupled from other components. Flight components communicate only by triggering and subscribing to events.

Flight also includes a simple and safe mixin infrastructure, allowing components to be easily extended with minimal boilerplate.

Development tools

Flight has supporting projects that provide everything you need to setup, write, and test your application.

Finding and writing components

You can browse all the Flight components available at this time. They can also be found by searching the Bower registry:

bower search flight

The easiest way to write a new Flight component is to use the Flight package generator:

yo flight-package foo

Browser Support

Chrome, Firefox, Safari, Opera, IE 7+ (requires ES5-shim).

Quick Overview

Here's a brief introduction to Flight's key concepts and syntax. Read the API documentation for a comprehensive overview.

Components (API)

  • A Component is nothing more than a constructor with properties mixed into its prototype.
  • Every Component comes with a set of basic functionality such as event handling and component registration. (see Base API)
  • Additionally, each Component definition mixes in a set of custom properties which describe its behavior.
  • When a component is attached to a DOM node, a new instance of that component is created. Each component instance references the DOM node via its
  • Component instances cannot be referenced directly; they communicate with other components via events.

Interacting with the DOM

Once attached, component instances have direct access to their node object via the

property. (There's also a jQuery version of the node available via the

Events in Flight

Events are how Flight components interact. The Component prototype supplies methods for triggering events as well as for subscribing to and unsubscribing from events. These Component event methods are actually just convenient wrappers around regular event methods on DOM nodes.

Mixins (API)

  • In Flight, a mixin is a function which assigns properties to a target object (represented by the
  • A typical mixin defines a set of functionality that will be useful to more than one component.
  • One mixin can be applied to any number of Component definitions.
  • One Component definition can have any number of mixins applied to it.
  • Each Component defines a core mixin within its own module.
  • A mixin can itself have mixins applied to it.

Advice (API)

In Flight, advice is a mixin (

) that defines

These can be used to modify existing functions by adding custom code. All Components have advice mixed in to their prototype so that mixins can augment existing functions without requiring knowledge of the original implementation. Moreover, since Components are seeded with an empty

method, Component definitions will typically use
to define custom

Debugging (API)

Flight ships with a debug module which can help you trace the sequence of event triggering and binding. By default console logging is turned off, but you can log

events by means of the following console commands.


Thanks for assistance and contributions: @sayrer, @shinypb, @kloots, @marcelduran, @tbrd, @necolas, @fat, @mkuklis, @jrburke, @garann, @WebReflection, @coldhead, @paulirish, @nimbupani, @mootcycle.

Special thanks to the rest of the Twitter web team for their abundant contributions and feedback.


Copyright 2013 Twitter, Inc and other contributors.

Licensed under the MIT License

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.