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Bring your web application to the next level with React.JS @BastianHofmann

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?

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Application architecture

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Code and component  re-use

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Rapid Development

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Handling large code-bases

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With React.js

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With small and independent components

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webserver HTML browser JS controller

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webserver HTML browser JS Ajax controller

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webserver HTML browser JS Ajax controller

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de duplication ode duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplication code duplicatio code duplicat code duplic code dup code du code cod co co

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A few words about me

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http://speakerdeck.com/u/bastianhofmann

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Application architecture

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status quo

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webserver loadbalancer pgsql memcached mongodb services

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webserver

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webserver HTML browser JS Ajax controller

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MVC

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Duplication and only some Code re- use

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We can do  better

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Small components over big controllers

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Self contained

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Can be used everywhere

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JS is part of the component

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CSS can be part of the component

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http://facebook.github.io/react/

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JavaScript UI Library

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Many small, self contained, reusable components

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var HelloMessage = React.createClass(
 {
 render: function () {
 return
Hello {this.props.name}
;
 }
 }
 );
 
 ReactDOM.render(, mountNode);

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var Timer = React.createClass({
 getInitialState: function () {
 return {secs: 0};
 },
 tick: function () {
 this.setState({secs: this.state.secs + 1});
 },
 componentDidMount: function () {
 this.interval = setInterval(this.tick, 1000);
 },
 componentWillUnmount: function () {
 clearInterval(this.interval);
 },
 render: function () {
 return (
Seconds Elapsed: {this.state.secs}
);
 }
 });
 
 ReactDOM.render(, mountNode);

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var TodoList = React.createClass(
 {
 render: function () {
 var createItem = function (itemText) {
 return
  • {itemText}
    • ;
 };
 return (
      {this.props.items.map(createItem)}
    );
 }
 }
 );

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

    


    TODO

    
 

    
 );
 }
 });

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    Getting the data in there

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    PHP Backend JSON React Frontend

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    PHP Backend JSON React Frontend

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    PHP Backend JSON React Frontend

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    PHP Backend JSON React Frontend

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    var TodoApp = React.createClass({
 getInitialState: function () {
 return {items: […]};
 },
 render: function () {
 return (

    


    TODO

    
 

    
 );
 }
 });

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    Problematic

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    Remember

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    Self-contained

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    Reusable

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    PHP Backend JSON React Frontend

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    PHP Backend JSON React Frontend

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    PHP Backend JSON React Frontend

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    Overfetching

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    Underfetching

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    Solutions

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    Flux Datastores

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    PHP Backend React Frontend Datastores

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    Requirements

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    PHP Backend React Frontend

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Institution Menu React Frontend

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu PHP Backend Request Response Institution

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    LeftColumn Image Menu React Frontend

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    LeftColumn Image Menu Request Response PHP Backend

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    Remember:  self contained

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu Account Account Account Account Account Publication1 Publication2 Publication3 Institution

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    Do not fetch data directly

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    Sssssssllllooooowww

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    Require stuff

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    http://www.infoq.com/presentations/Evolution-of-Code- Design-at-Facebook/

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    No content

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    Widget Widget Widget Widget Preparer Resolver Resolver Services Connector Interfaces Connector Implementations

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    Widget Widget Widget Widget Preparer Fetch Requirements Resolver Resolver Services Connector Interfaces Connector Implementations

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    Widget Widget Widget Widget Preparer Resolver Resolver Services Connector Interfaces Connector Implementations Batch requirements and pass them to resolvers

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    Widget Widget Widget Widget Preparer Resolver Resolver Services Connector Interfaces Connector Implementations Call Services as effective as possible (Multi-GET,...)

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    Widget Widget Widget Widget Preparer Resolver Resolver Services Connector Interfaces Connector Implementations Attach fetched data to Requirements and pass them back to the preparer

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    Widget Widget Widget Widget Preparer Resolver Resolver Services Connector Interfaces Connector Implementations Distribute fetched data to the widgets that required it

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    public function collect() {
 return [
 new EntityRequirement(
 'account',
 Account::class,
 ['id' => $this->request->get('id')]
 ),
 ];
 }

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    Request Cache

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    Multi-GET

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    Futures

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    Data dependencies within a widget

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    public function collect() {
 yield [
 new EntityRequirement(
 'account',
 Account::class,
 ['id' => $this->request->get('id')]
 ),
 ];
 
 yield [
 new ServiceRequirement(
 'scienceDisciplines',
 AccountService::class,
 'getScienceDisciplines',
 ['account' => $this->account]
 )
 ];
 }

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    Assembling the tree

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu PHP Backend Request Response Institution

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    Widget Requirement

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    var TodoApp = React.createClass({
 getInitialState: function () {
 return {items: […]};
 },
 render: function () {
 return (

    


    TODO

    
 

    
 );
 }
 });

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    class PublicationKeywordSearch {
 
 public $publications;
 public $publicationListItems = [];
 
 public function collect() {
 yield [
 serviceRequirement(
 'publications',
 PublicationService::getCall()->getByKeywords(
 ['virology', 'cancer'], 10, 0
 )
 )
 ];
 foreach ($this->publications as $publication) {
 yield new WidgetRequirement(
 'publicationListItems',
 PublicationItem::CLASS,
 [ 'publicationId' => $publication->getId() ]
 );
 }
 }
 }

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    class PublicationItem {
 
 public $publicationId;
 public $publication;
 
 public function collect() {
 yield new RequestDataRequirement('publicationId');
 yield [
 new EntityRequirement(
 'publication',
 Publication::class,
 ['id' => $this->publicationId]
 )
 ];
 }
 }

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu Institution

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    Getting the data to React.js

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    public function getData() {
 return [
 'key' => 'value',
 'other' => 'data',
 'number' => 42,
 'subComponent' => $this->subComponent,
 'someArray' => [1, 2, 3],
 'subComponentList' => [ $this->items[0], $this->items[1] ]
 ];
 }

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    {
 "ParentComponent-1234": {
 "component": "ParentComponent.jsx",
 "id": "ParentComponent-1234",
 "data": {
 "key": "value",
 "other": "data",
 "number": 42,
 "subComponent": "SubComponent",
 "someArray": [1, 2, 3],
 "subComponentList": [ "ListItem-444", "ListItem-555"]
 }
 },
 "SubComponent": {
 "component": "SubComponent.jsx",
 "id": "SubComponent",
 "data": { "boolValue": true }
 },
 "ListItem-444": {
 "component": "ListItem",
 "id": "ListItem-444",
 "data": { "title": "444s title“ }
 },
 "ListItem-555": {
 "component": "ListItem",
 "id": "ListItem-555",
 "data": { "title": "555s title" }
 }
 }

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    var React = require('react');
 var SubComponent = require('SubComponent');
 var ListItem = require('ListItem');
 
 module.exports = React.createClass(
 {
 displayName: 'ParentComponent',
 render: function () {
 var items = [];
 
 for (var key in this.props.subComponentList) {
 if (this.props.subComponentList.hasOwnProperty(key)) {
 items.push(

  • 
 

    • 
 );
 }
 }
 
 return (

    


    {this.props.other} Hello PHP {this.props.number}

    
 

      {items}
    

    
 );
 }
 }
 );

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    var React = require('react');
 
 module.exports = React.createClass(
 {
 displayName: 'ListItem',
 render: function () {
 return (

    
 {this.props.title}

    
 );
 }
 }
 );

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    GraphQL http://graphql.org/

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    PHP Backend React Frontend GraphQL

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    Server side rendering

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    SEO

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    Better user experience

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    Several approaches

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    http://pecl.php.net/package/v8js V8js

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    Request HTML Preparer libV8 React PHP process Data array Rendered HTML string

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    NodeJS proxy

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    Request HTML Preparer nodeJS Proxy React PHP process Data JSON Rendered HTML string

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    NodeJS service

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    Request HTML Preparer nodeJS service PHP process Data JSON Rendered HTML string React

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    Whoa

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    This looks awfully complicated to debug

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    No content

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    Benefits

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    Enables developers to only focus on their components

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    Rapid prototyping

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    Easier Refactoring

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    Easy re-using of components

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    Error Handling

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu Institution

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu EXCEPTION Institution

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    Profile Publications Publication Publication Publication LeftColumn Image Menu Institution

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    Experiments (A/B Testing)

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    Feature toggles

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu Institution

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    Profile Publications Publication Publication Publication AboutMeNew LeftColumn Image Menu Institution

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    Caching of Components

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu Institution

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    Load components asynchronously

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    Profile Publications Publication Publication Publication AboutMe LeftColumn Image Menu
    loadWidget('/aboutMe', function(w) { w.render({ replace : '#placeholder' }); }) Institution

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    Conclusion?

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    Think about your architecture

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    Refactor and make it better continuously

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    Frontend and backend are part of the same application

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    Don't rewrite your whole codebase in one go

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    https://joind.in/talk/1f1aa

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    http://twitter.com/BastianHofmann http://lanyrd.com/people/BastianHofmann http://speakerdeck.com/u/bastianhofmann [email protected]