Learn Nvda, Radium and Sequelize

NVDA (NonVisual Desktop Access) is a free “screen reader” which enables blind and vision impaired people to use computers.

nvda

NVDA is a popular open source screen reader on Windows that works well with Firefox. It's similar to JAWS, another popular Windows screen reader that works best with IE. But NVDA has no licensing fee plus an open bug tracker, making it great for users as well as developer testing. 

In this lesson, you'll learn how to browse a webpage using NVDA's keyboard shortcuts, including headings navigation, skip links, and the Elements List. You'll also learn a bit about Forms Mode and how it impacts screen reader navigation.  For more tips, check out the resources below.

## Resources
- [Using NVDA to Emulate Web Accessibility](http://webaim.org/articles/nvda/)
- [NVDA Keyboard Shortcuts](https://dequeuniversity.com/screenreaders/nvda-keyboard-shortcuts)
- [Understanding Screen Reader Interaction Modes](http://tink.uk/understanding-screen-reader-interaction-modes/)
- [Three Things You Should Know Before Using Voiceover for Testing](http://webaim.org/blog/three-things-voiceover/)

## Installing NVDA
If you're on a Windows machine, you can install [NVDA directly](http://www.nvaccess.org/download/). If you're on a Mac or Linux, you could install a Windows virtual machine:

- [Install VirtualBox](https://www.virtualbox.org/wiki/Downloads)
- [Get a Windows VM from Microsoft](https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/) - I use IE11
- [Install Firefox](https://www.mozilla.org/en-US/firefox/new/) - install on the VM!
- [Install NVDA](http://www.nvaccess.org/download/)
- [How to Map Your Mac's Capslock Key to a NVDA or JAWS Key in a Windows VM](https://www.marcozehe.de/2015/06/07/how-to-map-your-macs-capslock-key-to-a-nvda-or-jaws-key-in-a-windows-virtual-machine/)

Testing for Accessibility with the NVDA Screen Reader on Windows

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

In a CSS library like Bootstrap we can set a button's style to be "primary" or "secondary" by appending classes. For React components we want to be able to do this via props. Radium enables this by composing styles via an array. This mimicks the cascade of CSS.  

Radium: Updating Button Styles via Props

React's inline styles allow components to stand on their own by not requiring any external CSS. However HTML's style attributes don't support pseudo selectors like `:hover` and `:active`. By using Radium to listen to mouse events we can restore `:hover` and `:active` selectors to inline styles.

Styling a React button component with Radium

Sequelize is a promise-based ORM for Node.js and io.js. It supports the dialects PostgreSQL, MySQL, MariaDB, SQLite and MSSQL and features solid transaction support, relations, read replication and more.

sequelize

Sequelize attribute getters and setters are a convenient way to encapsulate extra logic for model properties. In this video, we'll cover adding getters and setters to enhance and even virtualize a column.

Sequelize: Getters, Setters and Virtual Columns

Models in the Node.js ORM, Sequelize, can be expanded with both class level and instance level functions. This video will show you how to extend your models to add helpers or business logic, and explain the methods execution scope.

Sequelize: Class & Instance Methods

Javascript and database systems tend to be at odds with regard to how tables and columns should be named. Sequlize provides all the tools necessary to satisfy naming conventions in both your Node.js code and in your SQL database.

Topics

Instructors

Content Type

Testing for Accessibility with the NVDA Screen Reader on Windows

Radium: Updating Button Styles via Props

Styling a React button component with Radium

Sequelize: Getters, Setters and Virtual Columns

Sequelize: Class & Instance Methods

Sequelize: Model & Column Casing