8000 example with-redux-observable (#3272) · JavaScriptExpert/next.js@5260736 · GitHub
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Commit 5260736

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Tomekmularczyktimneutkens
Tomekmularczyk
authored and
timneutkens
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example with-redux-observable (vercel#3272)
* example with-redux-observable * fix styling with js standard-style
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‎examples/with-redux-observable/README.md

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# Redux-Observable example
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## How to use
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Download the example [or clone the repo](https://github.com/zeit/next.js):
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```bash
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curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/with-redux-observable
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cd with-redux-observable
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```
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Install it and run:
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```bash
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npm install
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npm run dev
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```
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### The idea behind the example
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Example is a page that renders information about Star-Wars characters. It fetches new character
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every 3 seconds having the initial character fetched on a server.
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Example also uses `redux-logger` to log every action.
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![demo page](demo.png)
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The main problem with integrating Redux, Redux-Observable and Next.js is probably making initial requests
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on a server. That's because it's not possible to wait until epics are resolved in `getInitialProps` hook.
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In order to have best of two worlds, we can extract request logic and use it separately.
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That's what `lib/api.js` is for. It keeps functions that return configured Observable for ajax request.
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You can notice that `fetchCharacter` method is used to get initial data in `pages/index.js`
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and also in `lib/reducer.js` within an epic.
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Other than above, configuration is pretty the same as in
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[with-redux example](https://github.com/zeit/next.js/tree/canary/examples/with-redux)
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and [redux-observable docs](https://redux-observable.js.org/). There is, however one important thing
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to note, that we are not using `AjaxObservable` from `rxjs` library because it doesn't work on Node.
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Because of this we use a library like [universal-rx-request](https://www.npmjs.com/package/universal-rx-request).
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‎examples/with-redux-observable/components/CharacterInfo.js

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import React from 'react'
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import { connect } from 'react-redux'
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const CharacterInfo = ({character, error, fetchCharacter, isFetchedOnServer = false}) => (
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<div className='CharacterInfo'>
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{
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error ? <p>We encountered and error.</p>
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: <article>
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<h3>Character: {character.name}</h3>
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<p>birth year: {character.birth_year}</p>
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<p>gender: {character.gender}</p>
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<p>skin color: {character.skin_color}</p>
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<p>eye color: {character.eye_color}</p>
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</article>
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}
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<p>
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( was character fetched on server? -
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<b>{isFetchedOnServer.toString()})</b>
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</p>
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<style jsx>{`
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article {
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background-color: #528CE0;
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border-radius: 15px;
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padding: 15px;
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width: 250px;
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margin: 15px 0;
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color: white;
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}
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button {
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margin-right: 10px;
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}
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`}</style>
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</div>
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)
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export default connect(
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state => ({
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character: state.character,
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error: state.error,
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isFetchedOnServer: state.isFetchedOnServer
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}),
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)(CharacterInfo)

‎examples/with-redux-observable/demo.png

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‎examples/with-redux-observable/lib/api.js

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/**
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* Ajax actions that return Observables.
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* They are going to be used by Epics and in getInitialProps to fetch initial data.
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*/
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import { ajax, Observable } from './rxjs-library'
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import { fetchCharacterSuccess, fetchCharacterFailure } from './reducer'
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export const fetchCharacter = (id, isServer) =>
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ajax({ url: `https://swapi.co/api/people/${id}` })
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.map(response => fetchCharacterSuccess(response.body, isServer))
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.catch(error => Observable.of(fetchCharacterFailure(error.response.body, isServer)))

‎examples/with-redux-observable/lib/index.js

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import { createStore, applyMiddleware } from 'redux'
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import thunkMiddleware from 'redux-thunk'
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import { createLogger } from 'redux-logger'
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import { combineEpics, createEpicMiddleware } from 'redux-observable'
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import starwarsReducer, { fetchUserEpic } from './reducer'
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const rootEpic = combineEpics(
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fetchUserEpic,
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)
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export default function initStore (initialState) {
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const epicMiddleware = createEpicMiddleware(rootEpic)
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const logger = createLogger({ collapsed: true }) // log every action to see what's happening behind the scenes.
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const reduxMiddleware = applyMiddleware(thunkMiddleware, epicMiddleware, logger)
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return createStore(starwarsReducer, initialState, reduxMiddleware)
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};

‎examples/with-redux-observable/lib/reducer.js

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import * as api from './api'
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import { Observable } from './rxjs-library'
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const FETCH_CHARACTER_SUCCESS = 'FETCH_CHARACTER_SUCCESS'
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const FETCH_CHARACTER_FAILURE = 'FETCH_CHARACTER_FAILURE'
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const START_FETCHING_CHARACTERS = 'START_FETCHING_CHARACTERS'
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const STOP_FETCHING_CHARACTERS = 'STOP_FETCHING_CHARACTERS'
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const INITIAL_STATE = {
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nextCharacterId: 1,
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character: {},
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isFetchedOnServer: false,
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error: null
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}
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export default function reducer (state = INITIAL_STATE, { type, payload }) {
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switch (type) {
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case FETCH_CHARACTER_SUCCESS:
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return {
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...state,
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character: payload.response,
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isFetchedOnServer: payload.isServer,
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nextCharacterId: state.nextCharacterId + 1
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}
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case FETCH_CHARACTER_FAILURE:
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return { ...state, error: payload.error, isFetchedOnServer: payload.isServer }
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default:
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return state
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}
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}
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export const startFetchingCharacters = () => ({ type: START_FETCHING_CHARACTERS })
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export const stopFetchingCharacters = () => ({ type: STOP_FETCHING_CHARACTERS })
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export const fetchUserEpic = (action$, store) =>
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action$.ofType(START_FETCHING_CHARACTERS)
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.mergeMap(
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action => Observable.interval(3000)
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.mergeMap(x => api.fetchCharacter(store.getState().nextCharacterId))
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.takeUntil(action$.ofType(STOP_FETCHING_CHARACTERS))
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)
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export const fetchCharacterSuccess = (response, isServer) => ({
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type: FETCH_CHARACTER_SUCCESS,
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payload: { response, isServer }
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})
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export const fetchCharacterFailure = (error, isServer) => ({
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type: FETCH_CHARACTER_FAILURE,
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payload: { error, isServer }
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})

‎examples/with-redux-observable/lib/rxjs-library.js

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// we bundle only what is necessary from rxjs library
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import 'rxjs/add/operator/mergeMap'
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import 'rxjs/add/operator/map'
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import 'rxjs/add/operator/delay'
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import 'rxjs/add/operator/takeUntil'
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import { Observable } from 'rxjs/Observable'
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import 'rxjs/add/observable/interval'
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import ajax from 'universal-rx-request' // because standard AjaxObservable only works in browser
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export {
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Observable,
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ajax
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}

‎examples/with-redux-observable/package.json

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{
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"name": "with-redux-observable",
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"version": "1.0.0",
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"scripts": {
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"dev": "next",
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"build": "next build",
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"start": "next start"
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},
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"author": "tomaszmularczyk(tomasz.mularczyk89@gmail.com)",
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"dependencies": {
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"next": "latest",
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"next-redux-wrapper": "^1.0.0",
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"react": "^16.0.0",
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"react-dom": "^16.0.0",
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"react-redux": "^5.0.1",
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"redux": "^3.6.0",
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"redux-logger": "^3.0.6",
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"redux-observable": "^0.17.0",
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"redux-thunk": "^2.1.0",
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"rxjs": "^5.5.2",
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"superagent": "^3.8.1",
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"universal-rx-request": "^1.0.3"
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},
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"license": "ISC"
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}

‎examples/with-redux-observable/pages/index.js

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import React from 'react'
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import Link from 'next/link'
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import withRedux from 'next-redux-wrapper'
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import initStore from '../lib'
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import { startFetchingCharacters, stopFetchingCharacters } from '../lib/reducer'
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import * as api from '../lib/api'
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import CharacterInfo from '../components/CharacterInfo'
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class Counter extends React.Component {
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static async getInitialProps ({ store, isServer }) {
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const nextCharacterId = store.getState().nextCharacterId
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const resultAction = await api.fetchCharacter(nextCharacterId, isServer).toPromise() // we need to convert observable to Promise
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store.dispatch(resultAction)
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return { isServer }
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}
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componentDidMount () {
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this.props.startFetchingCharacters()
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}
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componentWillUnmount () {
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this.props.stopFetchingCharacters()
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}
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render () {
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return (
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<div>
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<h1>Index Page</h1>
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<CharacterInfo />
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<br />
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<nav>
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<Link href='/other'><a>Navigate to "/other"</a></Link>
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</nav>
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</div>
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)
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}
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}
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export default withRedux(
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initStore,
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null,
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{
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startFetchingCharacters,
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stopFetchingCharacters
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},
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)(Counter)

‎examples/with-redux-observable/pages/other.js

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import React from 'react'
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import Link from 'next/link'
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const OtherPage = () => (
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<div>
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<h1>Other Page</h1>
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<Link href='/'>
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<a>Get back to "/"</a>
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</Link>
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</div>
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)
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export default OtherPage

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