This is the first Community Round-up where none of the items are from Facebook/Instagram employees. It's great to see the adoption of React growing.

React Game Tutorial

Caleb Cassel wrote a step-by-step tutorial about making a small game. It covers JSX, State and Events, Embedded Components and Integration with Backbone.

Reactify

Andrey Popp created a Browserify helper to compile JSX files.

Browserify v2 transform for text/jsx. Basic usage is:

% browserify -t reactify main.jsx

reactify transform activates for files with either .jsx extension or /** @jsx React.DOM */ pragma as a first line for any .js file.

Check it out on Github...

React Integration with Este

Daniel Steigerwald is now using React within Este, which is a development stack for web apps in CoffeeScript that are statically typed using the Closure Library.

este.demos.react.todoApp = este.react.create (`/** @lends {React.ReactComponent.prototype} */`)
  render: ->
    @div [
      este.demos.react.todoList 'items': @state['items']
      if @state['items'].length
        @p "#{@state['items'].length} items."
      @form 'onSubmit': @onFormSubmit, [
        @input
          'onChange': @onChange
          'value': @state['text']
          'autoFocus': true
          'ref': 'textInput'
        @button "Add ##{@state['items'].length + 1}"
      ]
    ]

Check it out on Github...

React Stylus Boilerplate

Zaim Bakar shared his boilerplate to get started with Stylus CSS processor.

This is my boilerplate React project using Grunt as the build tool, and Stylus as my CSS preprocessor.

• Very minimal HTML boilerplate
• Uses Stylus, with nib included
• Uses two build targets:
  • grunt build to compile JSX and Stylus into a development build
  • grunt dist to minify and optimize the development build for production

Check it out on Github...

WebFUI

Conrad Barski, author of the popular book Land of Lisp, wants to use React for his ClojureScript library called WebFUI.

I'm the author of "Land of Lisp" and I love your framework. I built a somewhat similar framework a year ago WebFUI aimed at ClojureScript. My framework also uses global event delegates, a global "render" function, DOM reconciliation, etc just like react.js. (Of course these ideas all have been floating around the ether for ages, always great to see more people building on them.)

Your implementation is more robust, and so I think the next point release of webfui will simply delegate all the "hard work" to react.js and will only focus on the areas where it adds value (enabling purely functional UI programming in clojurescript, and some other stuff related to streamlining event handling)

Read the full post...

Today we're releasing a gem to make it easier to use React and JSX in Ruby on Rails applications: react-rails.

This gem has 2 primary purposes:

1. To package react.js in a way that's easy to use and easy to update.
2. To allow you to write JSX without an external build step to transform that into JS.

Packaging react.js

To make react.js available for use client-side, simply add react to your manifest, and declare the variant you'd like to use in your environment. When you use :production, the minified and optimized react.min.js will be used instead of the development version. For example:

# config/environments/development.rb

MyApp::Application.configure do
  config.react.variant = :development
  # use :production in production.rb
end

// app/assets/javascript/application.js

//= require react

Writing JSX

When you name your file with myfile.js.jsx, react-rails will automatically try to transform that file. For the time being, we still require that you include the docblock at the beginning of the file. For example, this file will get transformed on request.

/** @jsx React.DOM */
React.renderComponent(<MyComponent/>, document.getElementById('example'))

Asset Pipeline

react-rails takes advantage of the asset pipeline that was introduced in Rails 3.1. A very important part of that pipeline is the assets:precompile Rake task. react-rails will ensure that your JSX files will be transformed into regular JS before all of your assets are minified and packaged.

Installation

Installation follows the same process you're familiar with. You can install it globally with gem install react-rails, though we suggest you add the dependency to your Gemfile directly.

React v0.4.1 is a small update, mostly containing correctness fixes. Some code has been restructured internally but those changes do not impact any of our public APIs.

React

• setState callbacks are now executed in the scope of your component.
• click events now work on Mobile Safari.
• Prevent a potential error in event handling if Object.prototype is extended.
• Don't set DOM attributes to the string "undefined" on update when previously defined.
• Improved support for <iframe> attributes.
• Added checksums to detect and correct cases where server-side rendering markup mismatches what React expects client-side.

JSXTransformer

• Improved environment detection so it can be run in a non-browser environment.

Download it now!

We launched the React Facebook Page along with the React v0.4 launch. 700 people already liked it to get updated on the project :)

Cross-browser onChange

Ben Alpert from Khan Academy worked on a cross-browser implementation of onChange event that landed in v0.4. He wrote a blog post explaining the various browser quirks he had to deal with.

First off, what is the input event? If you have an <input> element and want to receive events whenever the value changes, the most obvious thing to do is to listen to the change event. Unfortunately, change fires only after the text field is defocused, rather than on each keystroke. The next obvious choice is the keyup event, which is triggered whenever a key is released. Unfortunately, keyup doesn't catch input that doesn't involve the keyboard (e.g., pasting from the clipboard using the mouse) and only fires once if a key is held down, rather than once per inserted character.

Both keydown and keypress do fire repeatedly when a key is held down, but both fire immediately before the value changes, so to read the new value you have to defer the handler to the next event loop using setTimeout(fn, 0) or similar, which slows down your app. Of course, like keyup, neither keydown nor keypress fires for non-keyboard input events, and all three can fire in cases where the value doesn't change at all (such as when pressing the arrow keys).

Read the full post...

React Samples

Learning a new library is always easier when you have working examples you can play with. jwh put many of them on his react-samples Github repo.

Some simple examples with Facebook's React framework

• Bootstrap action bar, modal and table #1, #2, #3, #4
• Comments #1, #2
• Data Table #1, #2, #3, #4, #5
• Filter Bar #1, #2, #3, #4, #5
• Fundoo Rating #1
• Line Char: #1, #2
• Multi tabs #1
• Select #1
• Simple Tabs #1, #2, #3, #4
• Toggle #1

React Chosen Wrapper

Cheng Lou wrote a wrapper for the Chosen input library called react-chosen. It took just 25 lines to be able to use jQuery component as a React one.

React.renderComponent(
  <Chosen noResultsText="No result" value="Harvest" onChange={doSomething}>
    <option value="Facebook">Facebook</option>
    <option value="Harvest">Harvest</option>
  </Chosen>
, document.getElementById('example'));

JSX and ES6 Template Strings

Domenic Denicola wrote a slide deck about the great applications of ES6 features and one slide shows how we could use Template Strings to compile JSX at run-time without the need for a pre-processing phase.

React Presentation

Tom Occhino and Jordan Walke, React developers, did a presentation of React at Facebook Seattle's office. Check out the first 25 minutes for the presentation and the remaining 45 for a Q&A. I highly recommend you watching this video.

Docs

Pete Hunt rewrote the entirety of the docs for v0.4. The goal was to add more explanation about why we built React and what the best practices are.

Guides

• Why React?
• Displaying Data
  • JSX in Depth
  • JSX Gotchas
• Interactivity and Dynamic UIs
• Multiple Components
• Reusable Components
• Forms
• Working With the Browser
  • More About Refs
• Tooling integration
• Reference

Over the past 2 months we've been taking feedback and working hard to make React even better. We fixed some bugs, made some under-the-hood improvements, and added several features that we think will improve the experience developing with React. Today we're proud to announce the availability of React v0.4!

This release could not have happened without the support of our growing community. Since launch day, the community has contributed blog posts, questions to the Google Group, and issues and pull requests on GitHub. We've had contributions ranging from documentation improvements to major changes to React's rendering. We've seen people integrate React into the tools they're using and the products they're building, and we're all very excited to see what our budding community builds next!

React v0.4 has some big changes. We've also restructured the documentation to better communicate how to use React. We've summarized the changes below and linked to documentation where we think it will be especially useful.

When you're ready, go download it!

React

• Switch from using id attribute to data-reactid to track DOM nodes. This allows you to integrate with other JS and CSS libraries more easily.
• Support for more DOM elements and attributes (e.g., <canvas>)
• Improved server-side rendering APIs. React.renderComponentToString(<component>, callback) allows you to use React on the server and generate markup which can be sent down to the browser.
• prop improvements: validation and default values. Read our blog post for details...
• Support for the key prop, which allows for finer control over reconciliation. Read the docs for details...
• Removed React.autoBind. Read our blog post for details...
• Improvements to forms. We've written wrappers around <input>, <textarea>, <option>, and <select> in order to standardize many inconsistencies in browser implementations. This includes support for defaultValue, and improved implementation of the onChange event, and circuit completion. Read the docs for details...
• We've implemented an improved synthetic event system that conforms to the W3C spec.
• Updates to your component are batched now, which may result in a significantly faster re-render of components. this.setState now takes an optional callback as its second parameter. If you were using onClick={this.setState.bind(this, state)} previously, you'll want to make sure you add a third parameter so that the event is not treated as the callback.

JSX

• Support for comment nodes <div>{/* this is a comment and won't be rendered */}</div>
• Children are now transformed directly into arguments instead of being wrapped in an array E.g. <div><Component1/><Component2/></div> is transformed into React.DOM.div(null, Component1(null), Component2(null)). Previously this would be transformed into React.DOM.div(null, [Component1(null), Component2(null)]). If you were using React without JSX previously, your code should still work.

react-tools

• Fixed a number of bugs when transforming directories
• No longer re-write require()s to be relative unless specified