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    A lightweight, component-based JavaScript framework
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    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, flight.

    <!-- jQuery -->
    <script src="//"></script>
    <!-- Flight release -->
    <script src=""></script>

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

    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 this keyword).
    • 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 ('lib/advice.js') that defines before, after and around methods.

    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 initialize method, Component definitions will typically use after to define custom initialize behavior.

    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 trigger, on and off 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

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