react-on-rails
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React on Rails integrates Rails with (server rendering of) Facebook's React front-end framework.
Interested in optimizing your webpack setup for React on Rails including code splitting with react-router v4, webpack v4, and react-loadable with server side rendering? Contact Justin Gordon.
To provide an opinionated and optimal framework for integrating Ruby on Rails with React via the Webpacker gem especially in regards to React Server Rendering.
Given that rails/webpacker gem already provides basic React integration, why would you use "React on Rails"?
See the react-webpack-rails-tutorial for an example of a live implementation and code.
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React on Rails Pro provides Node server rendering and other performance enhancements for React on Rails.
For more information, see the React on Rails Pro Docs.
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ShakaCode can also help you with your custom software development needs. We specialize in marketplace and e-commerce applications that utilize both Rails and React. Because we own HawaiiChee.com, we can leverage that code for your app!
The article Why Hire ShakaCode? provides additional details about our projects.
Please email me (Justin Gordon), the creator of React on Rails, to see if I can help you or if you want an invite to our private Slack room for ShakaCode.
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Justin and his team were instrumental in assisting us in setting design foundations and standards for our transition to a react on rails application. Just three months of work with the team at Shaka code and we have a main page of our application server-side rendering at exponentially improved speeds.
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React on Rails supports older versions of Rails back to 3.x. Rails/webpacker requires version 4.2+.
Note, the best way to understand how to use ReactOnRails is to study a few simple examples. You can do a quick demo setup, either on your existing app or on a new Rails app.
See also the instructions for installing into an existing Rails app.
Create a new Rails app:
$ rails new my-app --webpack=react
$ cd my-app
Add the react_on_rails gem to Gemfile:
gem 'react_on_rails', '11.1.4' # Use the exact gem version to match npm version
Install the react_on_rails gem:
$ bundle install
Commit this to git (or else you cannot run the generator unless you pass the option --ignore-warnings).
Run the generator:
$ rails generate react_on_rails:install
Start the app:
$ rails s
With the code from running the React on Rails generator above:
app/views/hello_world/index.html.erb and set prerender to true.Below is the line where you turn server rendering on by setting prerender to true:
<%= react_component("HelloWorld", props: @hello_world_props, prerender: false) %>
config/initializers/react_on_rails.rb. You can adjust some necessary settings and defaults. See file docs/basics/configuration.md for documentation of all configuration options.config/webpacker.yml. If you used the generator and the default webpacker setup, you don't need to touch this file. If you are customizing your setup, then consult the spec/dummy/config/webpacker.yml example
compile: false for all envspublic_output_path must match your Webpack configuration for output of your bundles.cache_manifest to true in your production env.React component are rendered via your Rails Views. Here's an ERB sample:
<%= react_component("HelloWorld", props: @some_props) %>
Server-Side Rendering: Your react component is first rendered into HTML on the server. Use the prerender option:
<%= react_component("HelloWorld", props: @some_props, prerender: true) %>
The component_name parameter is a string matching the name you used to expose your React component globally. So, in the above examples, if you had a React component named "HelloWorld", you would register it with the following lines:
import ReactOnRails from 'react-on-rails';
import HelloWorld from './HelloWorld';
ReactOnRails.register({ HelloWorld });
Exposing your component in this way is how React on Rails is able to reference your component from a Rails view. You can expose as many components as you like, as long as their names do not collide. See below for the details of how you expose your components via the react_on_rails webpack configuration.
@some_props can be either a hash or JSON string. This is an optional argument assuming you do not need to pass any options (if you want to pass options, such as prerender: true, but you do not want to pass any properties, simply pass an empty hash {}). This will make the data available in your component:
# Rails View
<%= react_component("HelloWorld", props: { name: "Stranger" }) %>
This is what your HelloWorld.js file might contain. The railsContext is always available for any parameters that you always want available for your React components. It has nothing to do with the concept of the React Context. See Generator Functions and the RailsContext for more details on this topic.
import React from 'react';
export default (props, railsContext) => {
return (
<div>
Your locale is {railsContext.i18nLocale}.<br/>
Hello, {props.name}!
</div>
);
};
See the View Helpers API for more details on react_component and its sibling function react_component_hash.
Fragment caching is a React on Rails Pro feature. Fragment caching is a HUGE performance booster for your apps. Use the cached_react_component and cached_react_component_hash. The API is the same as react_component and react_component_hash, but for 2 differences:
cache_key takes the same parameters as any Rails cache view helper.some_slow_method_that_returns_props:<%= cached_react_component("App", cache_key: [@user, @post], prerender: true) do
some_slow_method_that_returns_props
end %>
Such fragment caching saves a ton of CPU work for your web server and greatly reduces the request time. It completely skips the evaluation costs of:
Note, even without server rendering (without step 3 above), fragment caching is still effective.
Default server rendering is done by ExecJS. If you want to use a Node.js server for better performing server rendering, email justin@shakacode.com. ShakaCode has built a premium Node rendering server that is part of React on Rails Pro.
For the React on Rails view helper react_component to use your React components, you will have to register them in your JavaScript code.
Use modules just as you would when using Webpack and React without Rails. The difference is that instead of mounting React components directly to an element using React.render, you register your components to ReactOnRails and then mount them with helpers inside of your Rails views.
This is how to expose a component to the react_component view helper.
// app/javascript/packs/hello-world-bundle.js
import HelloWorld from '../components/HelloWorld';
import ReactOnRails from 'react-on-rails';
ReactOnRails.register({ HelloWorld });
You may want different code for your server-rendered components running server side versus client side. For example, if you have an animation that runs when a component is displayed, you might need to turn that off when server rendering. One way to handle this is conditional code like if (window) { doClientOnlyCode() }.
Another way is to use a separate webpack configuration file that can use a different server side entry file, like 'serverRegistration.js' as opposed to 'clientRegistration.js.' That would set up different code for server rendering.
For details on techniques to use different code for client and server rendering, see: How to use different versions of a file for client and server rendering. (Requires creating a free account.)
You have two ways to specify your React components. You can either register the React component directly, or you can create a function that returns a React component. Creating a function has the following benefits:
railsContext. See documentation for the railsContext in terms of why you might need it. You need a generator function to access the railsContext.ReactOnRails will automatically detect a registered generator function. Thus, there is no difference between registering a React Component versus a "generator function."
Another reason to use a generator function is that sometimes in server rendering, specifically with React Router, you need to return the result of calling ReactDOMServer.renderToString(element). You can do this by returning an object with the following shape: { renderedHtml, redirectLocation, error }. Make sure you use this function with react_component_hash.
For server rendering, if you wish to return multiple HTML strings from a generator function, you may return an Object from your generator function with a single top-level property of renderedHtml. Inside this Object, place a key called componentHtml, along with any other needed keys. An example scenario of this is when you are using side effects libraries like React Helmet. Your Ruby code will get this Object as a Hash containing keys componentHtml and any other custom keys that you added:
{ renderedHtml: { componentHtml, customKey1, customKey2} }
For details on using react_component_hash with react-helmet, see the docs below for the helper API and docs/additional-reading/react-helmet.md.
You can enable the i18n functionality with react-intl. React on Rails provides an option for automatic conversions of Rails *.yml locale files into *.js files for react-intl. See the How to add I18n for a summary of adding I18n.
Browse the links in the Summary Table of Contents
Here are some highly recommended next articles to read:
Aloha, I'm Justin Gordon the creator and maintainer of React on Rails. I'm supporting my continued dedication to this project by project by offering a React on Rails Pro Support Plan. Please email me to see if I can help you.
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Bug reports and pull requests are welcome. See Contributing to get started, and the list of help wanted issues.
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The gem is available as open source under the terms of the MIT License.
[11.3.0] - 2019-05-24
Added method for retrieving any option from render_options PR 1213
by ashgaliyev.
html_options has an option for 'tag' to set the html tag name like this: html_options: { tag: "span" }.
PR 1208 by tahsin352.
FAQs
react-on-rails JavaScript for react_on_rails Ruby gem
The npm package react-on-rails receives a total of 49,872 weekly downloads. As such, react-on-rails popularity was classified as popular.
We found that react-on-rails demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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