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Wikimedia Foundation projects OOUI Group: Contributors Start: 2013-10

OOUI
Introduction
About the library OOjs primer
Getting started
Creating interfaces programmatically PHP examples Using OOUI in MediaWiki
Working with widgets
Elements GroupElements FlaggedElements LookupElements DraggableElements Widgets Icons, Indicators, and Labels Buttons and Switches Selects and Options Inputs Popups Progress bars Layouts Fields and Fieldsets Forms Stacks and Panels Menus Booklets and Pages Index and TabPanels Windows Simple messages Dialogs Process Dialogs Message Dialogs Window managers Toolbars Themes Other concepts
See also
Fixing scripts and gadgets

OOUI allows developers to create responsive web user-interfaces and applications.

It is internationalization ready with full support of right-to-left languages, is accessible complying to Web Content Accessibility Guidelines and operates consistently across a multitude of browsers.

The OOUI library contains:

• Ready-to-use widgets, layouts, and windows that can be instantiated directly or easily extended,
• A PHP server-side compatible output for cases where JavaScript is not supported,
• Elements that can be easily mixed and matched to create custom user interfaces.

OOUI is available in MediaWiki Core, as well as on npm, Composer, and through cdnjs. OOUI implements a "WikimediaUI" theme – conforming to Wikimedia Foundation's design style guide. Interfaces built within MediaWiki use this theme by default, though different MediaWiki skins can and do over-ride this. See documentation about using OOUI in MediaWiki. It is successfully in use in 40+ web products by Wikimedia Foundation and volunteer developers. Community-created TypeScript definitions for OOUI exist (they work in JavaScript projects as well in popular IDEs).

Note that the library was originally created for the entire user interface of VisualEditor, on top of the OOjs primer (Object-Oriented JavaScript, hence OOUI's former name "OOjs UI"). It has later been extended to serve MediaWiki Core with PHP implemented widgets or responsive interfaces in project Advanced Mobile Contributions.

OOUI is pronounced oh-oh-you-eye.

The source code is hosted on Gerrit and mirrored on GitHub.

Future of OOUI alongside Codex

Codex's toolkit will replace OOUI as the default user interface library. Currently, development at the Wikimedia Foundation is focused on Codex, the design system for Wikimedia. It features guidelines and a set of tools: design tokens, components, and icons.

New OOUI feature development is limited only to products that are bound to it and have not (yet) been adapted to use Codex instead.

Note that in JS-only gadgets and userscripts, Codex cannot replace OOUI as of September 2023, at least not in any practical way. For gadget/userscript developers, there is currently no successor for OOUI available. You can participate in the discussion:

• "Enable gadget and user-script developers to use Vue and Codex" (task T313945)
• "Allow .vue files to be used in Gadgets" (task T340460)

Documentation

See the sidebar for a full list of documentation subpages.

See also

• API documentation generated from the source code on doc.wikimedia.org
• Interactive demos online and in the project's demos directory
• A tutorial on building a Todo list application using OOUI step by step
• OOJS/OOUI kick starter — Ready to code and demo user interface.