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@Jack_Franklin

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The ideas in React are more important than React itself

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Component Architecture

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Header News Feed Nav Chat with Alice

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React Components

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } })

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } })

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } })

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return

Hello World!

;

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JSX https://facebook.github.io/react/docs/jsx-in-depth.html

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This is a good thing, trust me…

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It’s not HTML in your JavaScript

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It’s JavaScript in your JavaScript

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// Input (JSX): var app = ; // Output (JS): var app = React.createElement( Nav, { color: "blue" } );

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You could write this without JSX

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } }) ReactDOM.render( , document.getElementById('app') )

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } }) ReactDOM.render( , document.getElementById('app') )

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var HelloWorld = React.createClass({ render: function() { return

Hello World!

; } }) ReactDOM.render( , document.getElementById('app') )

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https://jsbin.com/fujaru/edit?html,js,output

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configuring components

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props

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var Person = React.createClass({ render: function() { return (

Name: { this.props.name }

Fav colour: { this.props.colour }

); } });

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ReactDOM.render( , document.body )

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https://jsbin.com/wulolu/edit?js,output

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props aren’t just for christmas!

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props: data the component doesn’t change

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components with just props are the best kind

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state

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var OnOff = React.createClass({ getInitialState: function() { return { on: false } }, render: function() { return (
Toggle

{ this.state.on ? 'ON' : 'OFF'}

) } })

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var OnOff = React.createClass({ getInitialState: function() { return { on: false } }, render: function() { return (
Toggle

{ this.state.on ? 'ON' : 'OFF'}

) } })

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events

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var OnOff = React.createClass({ ... render: function() { return (
Toggle
) } })

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var OnOff = React.createClass({ ... toggle: function() { this.setState({ on: !this.state.on }) }, … })

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http://jsbin.com/senedajafa/edit?js,output

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pure functions

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render: State -> VDOM render(x) => VDOM-X render(x) => VDOM-X render(y) => VDOM-Y

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state: data the component owns and will change

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use props by default

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Bonus: pure functional components

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Or: dumb components

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var ShowName = function(props) { return

Your name is { props.name }

; } ReactDOM.render( , document.body )

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var ShowName = function(props) { return

Your name is { props.name }

; } ReactDOM.render( , document.body ) http://jsbin.com/fawafahaqo/1/edit?js,output

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“This pattern is designed to encourage the creation of these simple components that should comprise large portions of your apps.”

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“In the future, we’ll also be able to make performance optimizations … by avoiding unnecessary checks and memory allocations” https://facebook.github.io/react/blog/2015/09/10/react-v0.14- rc1.html

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efficient rendering for free

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components in components in components in components

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omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co omponents in components in components in components in co components in components in components in components in c

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var Mailbox = React.createClass({ getInitialState: function() { return { messages: [{ id: 1, title: 'Hello', content: 'How is it going?', sender: 'Alice' }, {…}] } },

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render: function() { }

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var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var messages = this.state.messages; var mails = messages.map(function(message) { return (
    • ); }) return
      {mails}
    ;

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    var Message = React.createClass({ render() { return (

    { this.props.message.title }

    ); } });

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    http://jsbin.com/jagizaheqo/edit?js,output

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    reusable components

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    or: not hating yourself in 6 months time

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    var Person = React.createClass({ render() { return

    {this.props.name} has a favourite colour of {this.props.colour}

    } }) ReactDOM.render( , document.body )

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    ReactDOM.render( , document.body )

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    ReactDOM.render( , document.body )

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    propTypes

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    var types = React.PropTypes; var Person = React.createClass({ propTypes: { name: types.string.isRequired, colour: types.string.isRequired },

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    var types = React.PropTypes; var Person = React.createClass({ propTypes: { name: types.string.isRequired, colour: types.string.isRequired },

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    var types = React.PropTypes; var Person = React.createClass({ propTypes: { name: types.string.isRequired, colour: types.string.isRequired },

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    http://jsbin.com/wawevinesi/edit?js,output

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    encourage reuse use propTypes

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    propTypes aren’t checked in production

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    lifecycle

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    https://docs.google.com/drawings/ d/ 15yjhlRlNs2k8rDw1g_F9_nYWUL0 FsUDCFzAxMOGv5nI/edit

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    https://facebook.github.io/ react/docs/component- specs.html

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    componentWillMount

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    Talking to APIs

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    var GitHubPerson = React.createClass({ getInitialState: function() { return { data: {} }; }, componentWillMount: function() { getData().then(function(data) { this.setState({ data: data }) }.bind(this)); },

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    var GitHubPerson = React.createClass({ getInitialState: function() { return { data: {} }; }, componentWillMount: function() { getData().then(function(data) { this.setState({ data: data }) }.bind(this)); },

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    var GitHubPerson = React.createClass({ getInitialState: function() { return { data: {} }; }, componentWillMount: function() { getData().then(function(data) { this.setState({ data: data }) }.bind(this)); },

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    var GitHubPerson = React.createClass({ getInitialState: function() { return { data: {} }; }, componentWillMount: function() { getData().then(function(data) { this.setState({ data: data }) }.bind(this)); },

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    render: function() { return (

    { this.state.data.name } from { this.state.data.company }

    ); }

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    http://jsbin.com/nalozobapa/edit?js,output

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    https://facebook.github.io/ react/docs/thinking-in- react.html

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    There’s so much more!

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    URLs

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    https://github.com/ rackt/react-router

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    Data Management

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    http://redux.js.org/

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    As the requirements for JavaScript single-page applications have become increasingly complicated, our code must manage more state than ever before

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    STATE STORE

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    STATE STORE Uni-directional data flow

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    Universal React Testing React React Native React + CSS Modules

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    https://24ways.org/2015/ universal-react/ http://12devsofxmas.co.uk/ 2015/12/day-2-testing- react-applications/

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    One of the best (and overlooked) things about React is how much code you write that's just plain old JavaScript.

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    https:// facebook.github.io/react/

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    10th of June, London React Workshop http://www.whiteoctoberevents.co.uk/ event/reactjs-workshop-june-16/

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    @Jack_Franklin jack@pusher.com javascriptplayground.com

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    Questions?