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    A JavaScript application framework emphasizing modularity and encapsulation
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    Quick Info


    This repository contains Enyo core. We've pared it down to the essentials, so folks can work at the metal. Widget sets, localization code, and other fancy bits are in separate repos.

    Warning about file://

    Note: In Chrome, various samples will not work from file:// URLs because of Chrome's security policy. To work around this, run your app from a local http server, use the --allow-file-access-from-files flag when starting Chrome, or use the online samples at

    What Is Enyo?

    Enyo is an object-oriented JavaScript application framework emphasizing modularity and encapsulation. Enyo is suitable for both small- and large-scale applications.

    Enyo 1.x was the underlying framework used to develop applications for HP's TouchPad tablet. Enyo as shipped on the TouchPad included an complete set of user interface components and service wrappers. What you will find here is Enyo 2, what we informally call core: the primary infrastructure needed to support any number of Enyo-based libraries. Enyo 1.x is now available under an open-source license.

    Enyo was designed from the beginning to be highly extensible. This repository reflects a small working set of code that may be expanded with any number of libraries or plugins.

    Enyo 2 is lightweight, easy to digest, and powerful.

    What Do I Get?

    The core code includes the Enyo kernel, the DOM extensions, some Ajax (XHR) tools, and basic wrapper kinds for a lot of DOM form elements. We believe this is a useful working set of tools.

    Enyo 2 provides a modularity concept (Component) and a view concept (UiComponent). The DOM aspect includes a widget concept (Control) and an extensible event system (Dispatcher). Ajax resources include basic XHR functionality and an implementation of XHR as a Component (Ajax). In the UI arena, Enyo offers base kinds for common controls like buttons and popups, along with layout-oriented kinds, such as platform-optimized scrollers.

    By themselves, these pieces are sufficient to create large applications using the Enyo encapsulation model. Developers who only want this low-level code are encouraged to roll-their-own application and UI layers. For those who want a richer set of tools, we have several pre-built libraries available.

    Why Do I Care?

    First is our emphasis on cross-platform compatibility: Enyo core works on both desktop and mobile browsers.

    Second is Enyo's building block approach to applications. Each piece of an application is a Component, and Components are constructed out of other Components.

    For example, it's easy to define the combination of an <input> tag and a <label> tag in one LabeledInput Component.

    Now I can use (and re-use) LabeledInput as one atomic piece.

    But that's just the beginning. Ultimately, large pieces of functionality may be exposed as single Components--for example, a fancy report generator, or a color picker, or an entire painting application.

    Use the Enyo encapsulation model to divide and conquer large projects. No particular piece of an application need be especially complex. Because the combining of pieces is central, factoring complex functionality into smaller pieces comes naturally. Moreover, because of the modularity, all these pieces tend to be reusable--in the same project, in other projects, or even by the public at large.

    This is all part of our strategy to allow developers to focus on creativity and Avoid Repeating Themselves.

    That's a Lot of Talk

    The core Enyo design was proven out by the complex applications HP developed for the TouchPad platform. We don't claim that this was particularly easy; there were a lot of hardworking developers on the apps teams, but we are confident in the efficacy of Enyo's guiding principles on a large scale.

    But don't take our word for it; see for yourself.


    All samples reside in a consolidated sample app for Enyo and its libraries: enyo-strawman.

    Unless otherwise specified, all content, including all source code files and documentation files in this repository are:

    Copyright (c) 2012-2015 LG Electronics

    Unless otherwise specified or set forth in the NOTICE file, all content, including all source code files and documentation files in this repository are: Licensed under the Apache License, Version 2.0 (the "License"); you may not use this content except in compliance with the License. You may obtain a copy of the License at

    Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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