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React速習会@Wantedly
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Kento Moriwaki
February 04, 2016
Technology
1
400
React速習会@Wantedly
社内でReactを浸透させるために行った速習会の資料
Kento Moriwaki
February 04, 2016
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Transcript
Reactशձ@Wantedly 2016/02/04
୭ʁ • Kento Moriwaki • 2015य़ɺ৽ଔೖࣾ • ϑϩϯτΤϯυ͖ • Angular৮ͬͯͨ
ࠓΔ͜ͱ • React৮ͬͯΈΔ • Flux(Redux)ͯ͠ΈΔ • αʔόʔαΠυͰϨϯμϦϯάͯ͠ΈΔ • ଞͷใ
४උ git clone
[email protected]
:KentoMoriwaki/react_sokushu.git cd react_sokushu npm install npm install
-g webpack • Nodeݹ͗͢Δͱಈ͔ͳ͍͔ • v5.3.0Ͱ֬ೝ
४උ • Chrome dev toolͰReactͷσόοά͕ग़དྷΔ https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi
Reactͱ(Α͘ฉ͘) • Facebook͕։ൃ • UIͷͨΊͷϥΠϒϥϦ • ϑϨʔϜϫʔΫͰͳ͍ • ԾDOM •
JSX
ͱΓ͋͑ͣಈ͔͢ git checkout component npm start webpack —watch • http://localhost:3000ʹΞΫηε
• ೖྗͰ͖ͳ͍ϑΥʔϜ͕දࣔ͞ΕΔ
components/App.js import React, { Component } from 'react' export default
class App extends Component { constructor(props) { super(props) this.state = { title: '', description: '' } } render() { return ( <form> <fieldset> <legend>Create Issue</legend> <input type="text" value={this.state.title} placeholder="Input title" /> <textarea value={this.state.description} placeholder="Input description" /> <button>Save</button> </fieldset> </form> ) } }
Component • Reactͷओ • View + Controller • ViewJSXͰɺrenderϝιουʹهड़͢Δ •
this.stateʹঢ়ଶΛอ࣋͢Δ
One-way data binding • ೖྗͯ͠σʔλมΘΒͳ͍ • ࣗͰ໌ࣔతʹมߋ͠ͳ͍ͱɺϏϡʔม ΘΒͳ͍ • σʔλ͕มΘΔͱϏϡʔ͕ࣗಈతʹมΘΔ
• this.setState(newState)Ͱมߋ
One-way data binding • onChange={} ʹϋϯυϥΛॻ͍ͯঢ়ଶΛมߋ͢Δ onChangeTitle(e) { this.setState({ title:
e.target.value }) } onChangeDescription(e) { this.setState({ description: e.target.value }) } render() { return ( <form> <fieldset> <legend>Create Issue</legend> <input type="text" value={this.state.title} onChange={this.onChangeTitle.bind(this)} /> <textarea value={this.state.description} onChange={this.onChangeDescription.bind(this)} /> <button>Save</button> </fieldset> </form> ) }
One-way data binding • σʔλ͕Ұํʹ͔͠ྲྀΕͳ͍ • ߟ͑Δ͜ͱ͕γϯϓϧʹͳΔ • σʔλ͔ΒͲ͏ͬͯϏϡʔΛ࡞Δ͔ •
σʔλΛͲ͏มߋ͢Δ͔
ෳίϯϙʔωϯτ • ೖྗͨ͠σʔλΛϦετͰද͍ࣔͨ͠ • git checkout list • ͖ͬ͞ͷAppΛIssueFormʹ •
৽͘͠IssueListίϯϙʔωϯτΛ࡞
ෳίϯϙʔωϯτ
components/App.js • IssueFormͰ࡞ΒΕͨΦϒδΣΫτΛIssueList ʹ͍ͨ͠ import React, { Component } from
'react' import IssueList from './IssueList' import IssueForm from './IssueForm' export default class App extends Component { render() { return ( <div> <IssueList /> <IssueForm /> </div> ) } }
Property • ίϯϙʔωϯτϓϩύςΟΛ࣋ͭ • JSXͷଐੑͱͯ͠ड͚औΕΔ • <IssueList issues={this.state.issues} /> •
ܕͷఆٛͳͲ͕ߦ͑Δ • PropTypesͱݺΕɺͲ͏͍͏ଐੑ໊ͰͲ͏͍͏ܕ ͷσʔλΛड͚औΔ͔ఆٛͰ͖Δ
components/App.js • IssueList͕issuesϓϩύςΟΛड͚औΔ export default class App extends Component {
constructor(props) { super(props) this.state = { issues: [ { id: 1, title: 'First Issue', description: 'foobarbaz' }, { id: 2, title: 'Incident', description: 'OMG' } ] } } render() { return ( <div> <IssueList issues={this.state.issues} /> <IssueForm /> </div> ) } }
components/App.js • IssueForm͕onSubmitϓϩύςΟΛड͚औΔ export default class App extends Component {
onSubmit(issue) { let issues = this.state.issues issue.id = issues.length + 1 this.setState({ issues: issues.concat(issue) }) } render() { return ( <div> <IssueList issues={this.state.issues} /> <IssueForm onSubmit={this.onSubmit.bind(this)} /> </div> ) } }
components/IssueList.js • this.props Ͱ͞ΕͨଐੑΛࢀরͰ͖Δ export default class IssueList extends Component
{ render() { return ( <table> { this.props.issues.map((issue) => { return ( <tr key={issue.id}> <td>{issue.id}</td> <td>{issue.title}</td> <td>{issue.description}</td> </tr> ) }) } </table> ) } }
components/IssueList.js • this.props Ͱ͞ΕͨଐੑΛࢀরͰ͖Δ export default class IssueList extends Component
{ constructor(props) { super(props) this.state = { title: '', description: '' } } onSubmit(e) { e.preventDefault() this.props.onSubmit(this.state) } render() { return ( <form onSubmit={this.onSubmit.bind(this)}> <fieldset> <legend>Create Issue</legend> <input type="text" value={this.state.title} …/> <textarea value={this.state.description} … /> <button>Save</button> </fieldset> </form> ) } }
StateͱProperty • StateMutable • PropertyImmutable • StateΛࢠComponentͷPropertyͱͯ͢͠ • ࢠComponent͔ΒState͕มߋ͞ΕΔ͜ͱͳ͍ •
มߋίʔϧόοΫͰ
Flux
Fluxͱ • Facebook͕ఏএͨ͠ΞʔΩςΫνϟ • ΞϓϦέʔγϣϯͱͯ͠σʔλϑϩʔҰํ ͚ͩʹྲྀΕΔ
MVC • Model͕ViewΛ࡞ΓɺView͕ModelΛมߋ͠ɺ͞Βʹ View͕มߋ͞ΕΔ
Flux • Action͕StoreΛมߋ͠ɺStore͕ViewΛͭ͘ΓɺView͕ ActionΛൃߦ͢Δ
ΣϒαΠτͱࣅͯΔ • యܕతͳΣϒαΠτ • αʔόʔ͕ϦΫΤετΛड͚औΓɺ DBͷσʔλΛߋ৽͢Δ • ৽͍͠σʔλΛݩʹϖʔδΛҰ͔ΒϨϯμϦϯά͢Δ • Flux
• Dispatcher͕ActionΛड͚औΓɺStoreΛߋ৽͢Δ • ৽͍͠StoreΛݩʹϖʔδΛҰ͔ΒϨϯμϦϯά͢Δ • ຊReact্͕ख͍͜ͱඞཁͳ෦͚ͩϨϯμϦϯάͯ͘͠ΕΔ
Flux࣮ • ΞʔΩςΫνϟͳͷͰ࣮͍Ζ͍Ζ • MVCϑϨʔϜϫʔΫ͕͍ͬͺ͍ଘࡏ͢ΔΈ ͍ͨʹ • ࠷ۙਓؾͷReduxΛ৮ͬͯΈΔ
Redux • Flux࣮ͷ̍ͭ • ಛ • ΞϓϦέʔγϣϯͷঢ়ଶΛ̍ͭͰѻ͏ • ঢ়ଶread-only •
มߋ७ਮͳؔͰॻ͚Δ • git checkout flux
Action • ΞΫγϣϯ໊ͱҾΛ·ͱΊͨΦϒδΣΫτ • ActionCreator • ActionΛฦؔ͢ export const ADD
= 'ADD_ISSUE' export const REFRESH = 'REFRESH_ISSUES' export function addIssue(issue) { return { type: ADD, issue: issue } } export function refreshIssues(issues) { return { type: REFRESH, issues: issues } }
Reducer • Actionͱݱࡏͷঢ়ଶΛड͚ͯɺ৽͍͠ঢ়ଶΛฦؔ͢ const initialState = [ { id: 1,
title: 'First issue', author: {id: 1}, assignee: {id: 1} } ] export default function issues(state, action) { if (typeof state == 'undefined') { return initialState } switch (action.type) { case ADD: let issue = action.issue return [ ...state, { id: state.length + 1, title: issue.title, description: issue.description } ] case REFRESH: return action.issues } return state }
Container • ಛผͳComponent • ReduxͱReactΛܨ͛Δଘࡏ • ҎԼͷͷΛpropertyͱͯ͠ड͚औΕΔΑ͏ʹͳΔ • ReducerʹΑͬͯ࡞ΒΕΔঢ়ଶ(store) •
ActionΛൃߦ͢ΔͨΊͷdispatchؔ
Container import React, { Component } from 'react' import {
bindActionCreators } from 'redux' import { addIssue, loadIssues } from '../actions/issues' class App extends Component { onAdd(issue) { this.props.dispatch(addIssue(issue)) } render() { const { dispatch, issues } = this.props return ( <div> <IssueList issues={issues} onAdd={this.onAdd.bind(this)} /> </div> ) } } function mapStateToProps(state) { return { issues: state.issues } } export default connect(mapStateToProps)(App)
Container issuesͱdispatch͕͞Ε͍ͯΔ
Fluxͯ͠ΈΔ • git checkout flux • saveͯ͠Ճ͞Εͳ͍ϑΥʔϜ͕͋Δ • TODO •
reducers/issues.js • containers/App.js
reducers/issues.js • ΞΫγϣϯ͕ൃߦ͞Εͨͱ͖ʹstate͕Ͳ͏ม ΘΔ͔ͷ͕ؔ͋Δ͚ͩ import { ADD, REFRESH } from
'../actions/issues' const initialState = [ { id: 1, title: 'First issue', author: {id: 1}, assignee: {id: 1} } ] export default function issues(state, action) { if (typeof state == 'undefined') { return initialState } switch (action.type) { case ADD: //TODO: Add new issue } return state }
reducers/issues.js • ADDΞΫγϣϯͰɺstateʹissueΛՃͨ͠৽ ͍͠stateΛฦ͍͍ͤ import { ADD, REFRESH } from
'../actions/issues' const initialState = [ { id: 1, title: 'First issue', author: {id: 1}, assignee: {id: 1} } ] export default function issues(state, action) { if (typeof state == 'undefined') { return initialState } switch (action.type) { case ADD: //TODO: Add new issue } return state }
reducers/issues.js • ৽͍͠ྻΛฦ͢ • stateʹೖ͍͚ͯ͠ͳ͍ case ADD: let issue =
action.issue return [ ...state, { id: state.length + 1, title: issue.title, description: issue.description } ]
containers/App.js • ϑΥʔϜͷίʔϧόοΫͰɺActionΛൃߦ͠ ͍ͨ import React, { Component } from
'react' import { connect } from 'react-redux' import IssueList from '../components/IssueList' import { addIssue } from '../actions/issues' class App extends Component { onAdd(issue) { //TODO: Dispatch addIssue action! } render() { return ( <div> <IssueList issues={this.props.issues} onAdd={this.onAdd.bind(this)} /> </div> ) } }
containers/App.js • addIssueؔͰฦ͞ΕΔΞΫγϣϯΛɺ this.props.dispatchʹ͢ import IssueList from '../components/IssueList' import {
addIssue } from '../actions/issues' class App extends Component { onAdd(issue) { this.props.dispatch(addIssue(issue)) } render() { return ( <div> <IssueList issues={this.props.issues} onAdd={this.onAdd.bind(this)} /> </div> ) } }
Ajax • αʔόʔ͔ΒσʔλΛऔಘ͍ͨ͠ • ActionͰΔͷ͕Ұൠత • redux-thunk ͱ͍͏middlewareΛ͏ • git
checkout ajax
Ajax • ActionCreatorͰdispatchΛड͚ΔؔΛฦ͢ export const ADD = 'ADD_ISSUE' export const
LOAD = 'LOAD_ISSUES' export const REFRESH = 'REFRESH_ISSUES' export function addIssue(issue) { return { type: ADD, issue: issue } } export function refreshIssues(issues) { return { type: REFRESH, issues: issues } } export function loadIssues() { return dispatch => { fetch('/api/issues') .then(res => res.json()) .then(json => { dispatch(refreshIssues(json)) }) } }
Ajax • ड͚औͬͨdispatchΛඇಉظͰ࣮ߦ͢Δ export const ADD = 'ADD_ISSUE' export const
LOAD = 'LOAD_ISSUES' export const REFRESH = 'REFRESH_ISSUES' export function addIssue(issue) { return { type: ADD, issue: issue } } export function refreshIssues(issues) { return { type: REFRESH, issues: issues } } export function loadIssues() { return dispatch => { fetch('/api/issues') .then(res => res.json()) .then(json => { dispatch(refreshIssues(json)) }) } }
Ajax • Reducer import { ADD, REFRESH } from '../actions/issues'
export default function issues(state, action) { if (typeof state == 'undefined') { return initialState } switch (action.type) { case ADD: let issue = action.issue return [ ...state, { id: state.length + 1, title: issue.title, description: issue.description } ] case REFRESH: return action.issues } return state }
αʔόʔͰϨϯμϦϯάͯ͠ ΈΔ
αʔόʔαΠυϨϯμϦϯά • SEOͷ؍ • Ϋϩʔϥʔ͕Ͳ͜·ͰJavaScriptΛ্ख͘ѻ͍͑ͯΔ͔ෆ҆ • ੩తͳϖʔδΛฦ͍ͨ͠ • Ϣʔβʔମݧ •
ϖʔδʹΞΫηε͔ͯ͠ΒɺReactͷ࣮ߦΛͬͯɺAPIϦ ΫΤετૹͬͯɺඳը͞ΕΔͷ͕ɺ͍
Έ • DOM৮ͬͯͳ͍ͷͰɺαʔόʔଆͰ࣮ߦͰ͖ΔJS ʹͳ͍ͬͯΔ • ΞϓϦέʔγϣϯͷঢ়ଶ͕ܾ·ΕɺϏϡʔܾ· Δ • DOMͱͯ͠Ͱͳ͘ɺจࣈྻͱͯ͠Ϩϯμʔ͢Δ •
ͦͷঢ়ଶͷΦϒδΣΫτΛಉ࣌ʹฦ͢
ͬͯΈΔ • git checkout ssr • npm start ͷ࠶ىಈ
server.js • client.jsͱେମಉ͡ • renderToStringͰHTMLจࣈ ྻ͕࡞ΒΕΔ //TODO: Interpolate html and
initialState function renderFullPage(html, initialState) { return … } function handler(req, res) { const store = createStore(issueApp) //TOOD: Set initial data const html = renderToString( <Provider store={store}> <App /> </Provider> ) const initialState = store.getState() res.send(renderFullPage(html, initialState)) } app.use(Express.static('static')) app.use('/api/issues', issuesHandler) app.use(handler) app.listen(port)
server.js • renderFullPageͰrenderToString͞ΕͨHTML ͱɺॳظstateΛςϯϓϨʔτʹૠೖ͢Δ͚ͩ //TODO: Interpolate html and initialState function
renderFullPage(html, initialState) { return ` <!doctype html> <html> <head> <title>React Sokushu</title> </head> <body> <div id="root"></div> <script src="/dist/bundle.js"></script> </body> </html> ` }
server.js • renderFullPageͰrenderToString͞ΕͨHTML ͱɺॳظstateΛςϯϓϨʔτʹૠೖ͢Δ͚ͩ function renderFullPage(html, initialState) { return `
<!doctype html> <html> <head> <title>React Sokushu</title> </head> <body> <div id="root">${html}</div> <script> window.__INITIAL_STATE__ = ${JSON.stringify(initialState)} </script> <script src="/dist/bundle.js"></script> </body> </html> ` }
view-source
client.js • ঢ়ଶ͕Viewͱҧ͏ͱαΠϨϯμʔ͞ΕΔͷ Ͱɺॳظstate͔ΒstoreΛͭ͘ΔΑ͏ʹ͢Δ const store = createStore( issueApp, window.__INITIAL_STATE__,
applyMiddleware(thunk) ) render( <Provider store={store}> <App /> </Provider>, document.getElementById("root") )
CSS in React
CSS in React • CSSͷ • ໊લͷিಥ • Ϋϥε໊Λ͍ͬͺ͍ߟ͑ͳ͍ͱ •
ΘΕͳ͘ͳͬͨίʔυ͕ফͤͳ͍ • ංେԽ͢Δcss • JSXͰϏϡʔΛ.jsͰॻ͘Α͏ʹͳͬͨͷͰɺελΠϧҰॹʹॻ͖ ͍ͨ
CSS in React • ΫϥεΛ͚ΔΘΓʹinlineͰॻ͘ • style={this.styles.base} Έ͍ͨʹ • ܧঝͱ͔ਏ͍
• :hoverͱ͔͔͚ͳ͍
Radium • coreͰΓͳ͍ػೳΛՃ • https://github.com/FormidableLabs/radium • :hoverͰ͖Δ • ܧঝͰ͖Δ
ॻ͍ͯΈΔ • git checkout css • IssueForm͕ͪΐͬͱ͚ͩ៉ྷʹ
components/IssueForm.js import React, { Component } from 'react' import Radium
from 'radium' import color from 'color' class IssueForm extends Component { render() { return ( <div> <form onSubmit={this.onSubmit.bind(this)}> <fieldset> <legend>Create Issue</legend> <input style={styles.input} type="text" value={this.state.title} …/> <textarea style={styles.input} value={this.state.description} … /> <button style={styles.button}>Save</button> </fieldset> </form> </div> ) } } const styles = { input: { display: 'block', width: '200px', padding: '6px 10px', margin: '10px 0', border: '1px solid #ccc' }, button: { backgroundColor: '#00A4BB', border: 'none', padding: '6px 15px', color: 'white', cursor: 'pointer', } } export default Radium(IssueForm)
components/IssueForm.js class IssueForm extends Component { render() { return (
<div> <form onSubmit={this.onSubmit.bind(this)}> <fieldset> <legend>Create Issue</legend> <input style={styles.input} type="text" value={this.state.title} …/> <textarea style={styles.input} value={this.state.description} … /> <button style={styles.button}>Save</button> </fieldset> </form> </div> ) } } inlineͰ͍ͯͯ͘ దͳΫϥε໊ߟ͑ΔΑΓ؆୯
components/IssueForm.js const styles = { input: { display: 'block', width:
'200px', padding: '6px 10px', margin: '10px 0', border: '1px solid #ccc' }, button: { backgroundColor: '#00A4BB', border: 'none', padding: '6px 15px', color: 'white', cursor: 'pointer', } } ΦϒδΣΫτͰهड़
ͬͯΈΔ • :hoverͰϘλϯͷ৭Λม͑Δ • textareaͷߴ͞Λม͑Δ
components/IssueForm.js import React, { Component } from 'react' import Radium
from 'radium' import color from 'color' const styles = { input: { display: 'block', width: '200px', padding: '6px 10px', margin: '10px 0', border: '1px solid #ccc' }, textarea: { height: '100px' }, button: { backgroundColor: '#00A4BB', border: 'none', padding: '6px 15px', color: 'white', cursor: 'pointer', ':hover': { backgroundColor: color('#00A4BB').darken(0.2).hexString(), } } }
components/IssueForm.js • mouseenter, mouseleaveͰؤு͚ͬͯସ͑ ͯ͘Δ const styles = { button:
{ backgroundColor: '#00A4BB', border: 'none', padding: '6px 15px', color: 'white', cursor: 'pointer', ':hover': { backgroundColor: color('#00A4BB').darken(0.2).hexString(), } } }
components/IssueForm.js • ྻͰࢦఆ͢Δͱɺoverrideͯ͘͠ΕΔ • style={[styles.input, styles.textarea]} class IssueForm extends Component
{ render() { return ( <div> <form onSubmit={this.onSubmit.bind(this)}> <fieldset> <legend>Create Issue</legend> <input style={[styles.input]} type="text" value={this.state.title} … /> <textarea style={[styles.input, styles.textarea]} value={this.state.description} … /> <button style={[styles.button]}>Save</button> </fieldset> </form> </div> ) } }
components/IssueForm.js • ྻͰࢦఆ͢Δͱɺoverrideͯ͘͠ΕΔ • style={[styles.input, styles.textarea]} class IssueForm extends Component
{ render() { return ( <div> <form onSubmit={this.onSubmit.bind(this)}> <fieldset> <legend>Create Issue</legend> <input style={[styles.input]} type="text" value={this.state.title} … /> <textarea style={[styles.input, styles.textarea]} value={this.state.description} … /> <button style={[styles.button]}>Save</button> </fieldset> </form> </div> ) } }
·ͱΊ • ΫϥΠΞϯταΠυͷॻ͖ํ͕େ͖͘มΘΔ • ϏϡʔCSSjsʹೖΕΔ • ίϯϙʔωϯτͷڍಈ͚ͦͩ͜ΈΕશ ͔ͯΔʂ • αʔόʔαΠυϨϯμϦϯά؆୯