real-world
Redux Real World Example
Huge thanks to @thejmazz for taking the time to write these notes about how the codebase works! 🍻
React-Redux App Architecture
Entrypoint
File: index.js
Imports: agent.js
, store.js
, ./components/*
Renders routes pointing to their associated components:
Agent
File: agent.js
Exports an object where each key is a "service" and a service has methods that internally run a request:
get
put
post
delete
For example, Auth
:
Thus, these services essentially take some options, map to a request, and return the promise of that request. The general type could be:
As well, agent.js
locally stores a token which can be set via the exported setToken
. As some config there is API_ROOT
.
Redux
Store
File: store.js
Imports: reducer.js
, middleware.js
Fairly simple store setup, applies promiseMiddleware
before localStorageMiddleware
, logger only on development.
Middleware
File: middleware.js
Imports: agent.js
promiseMiddleware
Intercepts all actions where action.payload
is a Promise. In which case it:
store.dispatch({ type: 'ASYNC_START', subtype: action.type })
action.payload.then
success:
store.dispatch({ type: 'ASYNC_END', promise: res })
error: sets
action.error = true
,store.dispatch({ type: 'ASYNC_END', promise: action.payload })
Then, for success and error, using the modified
action
object:store.dispatch(action)
localStorageMiddleware
Runs after promiseMiddleware
. Intercepts REGISTER | LOGIN
and either
a. sets token into localstorage and
agent.setToken(token)
b. sets token in localstorage to
''
and doesagent.setToken(null)
Reducers
File: reducer.js
Imports: ./reducers/*.js
Uses combineReducers
to export a reducer where each key is the reducer of the file with the same key.
General Reducer Patterns
map payload into piece of state
toggle loading states by casing on
ASYNC_START
andaction.subtype
toggle errors by taking
action.errors
if it is there (see middleware)
set state keys to null if they did not come in payload (Flow type issues?)
handle redirections (will be triggered by
componentWillReceiveProps
somewhere)
Components
Most mapStateToProps
won't be mentionned, as there are fairly simple. Take some objects, use them in render.
mapDispatchToProps
will be referred to as "handlers". Some will emerge as common ones. Dispatching some specific handlers on some specific lifecylce methods will also emerge as a pattern.
Handlers:
onLoad
onUnload
onSubmit
onClick
onX
onLoad
seems to be the most common one, used for any components that need ajax in data into store into props into their render method (which is basically everything on an SPA lol).
Patterns
onLoad
handlers pass a Promise or multiple promises viaPromise.all
sending multiple leads to magic
payload[0]
andpayload[1]
in reducer (seereducers/article.js
)pass a handler, e.g.
onClickTag
as a prop to a child component. child component then calls it with agent:props.onClickTag(tag, agent.Articles.byTag(tag))
. (does this only ever happen with a connectedindex.jsx
inside a folder?)to render or not to render:
similary, if you cannot call handlers yet since props are not ready:
use
componentWillReceiveProps
to call handlers if necessary, e.g. inEditor.js
:
Root Component - "/"
Imported components: Header
Handlers
onLoad: (payload, token) => dispatch({ type: 'APP_LOAD', payload, token, skipTracking: true })
onRedirect: () => dispatch({ type: 'REDIRECT' })
Lifecycle
Home Component - "/"
(<IndexRoute>
on "/")
Handlers
Lifecycle
Other Components
Should be self explanatory, follow patterns described above, it was just the home and index components are somewhat unique due to handling of routing.
This project template was built with Create React App, which provides a simple way to start React projects with no build configuration needed.
Projects built with Create-React-App include support for ES6 syntax, as well as several unofficial / not-yet-final forms of Javascript syntax such as Class Properties and JSX. See the list of language features and polyfills supported by Create-React-App for more information.
Available Scripts
In the project directory, you can run:
npm start
npm start
Runs the app in the development mode. Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits. You will also see any lint errors in the console.
npm run build
npm run build
Builds the app for production to the build
folder.
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes. Your app is ready to be deployed!
npm run eject
npm run eject
Note: this is a one-way operation. Once you eject
, you can’t go back!
If you aren’t satisfied with the build tool and configuration choices, you can eject
at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject
will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
You don’t have to ever use eject
. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
Last updated