2016 SUTOL: React.js – High-Performance Client for Domino

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8th Sutol Conference, November 2016
React.js – High-Performance
Client for Domino
Knut Herrmann

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Thanks to our sponsors!

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Knut Herrmann
• Senior Software Architect
Leonso GmbH
• Notes Domino developer since version 2
• Web application developer
• StackOverflow contributor
E-Mail: knut.herrmann@leonso.de
Twitter: @KnutHerrmann
Skype: knut.herrmann

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Why React?

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Domino
Server
Notes
Client
Code
Data

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Domino
Server
XPages
Browser
Dojo
Data
HTML
JS

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Domino
Server
XPages
Browser
Dojo
Data
HTML
JS
Java

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Domino
Server
XPages
Browser
Dojo
Data
HTML
JS
Java
jQueryjqGrid
Select2 Bootstrap

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Domino
Server
XPages
Browser
Java
?
Code
Data
Database JSON UI
Wanted:

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Angular ?

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React !

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React
high performance
reusable components
declarative readable code
developed by Facebook

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GitHub Star Ranking
2013 May - first commit
2014 December - #33
2016 November - #5

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Websites built with React

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What is React?

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React
JavaScript library – not a framework
renders HTML on client side
virtual DOM
One-way data flow

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virtual DOM

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virtual DOM

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Component
component
state – internal data
render() – returns elements to render and event handling
lifecycle functions – mounting, changes, unmounting
props – data and functions as parameter
child componentscomponent component …
component component …

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Example
import React from 'react';
import ReactDOM from 'react-dom';
class App extends Component {
render() {
return (
<div>
<h1>{this.props.headline}</h1>
<Person name="Kurt Meier" />
<Person name="Hans Schulze" />
</div>
);
}
}
ReactDOM.render(<App headline="List of Attendees"/>,
document.getElementById('root'));
class Person extends Component {
render() {
return (
<div>
<h3>{this.props.name}</h3>
</div>
);
}
}

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Example
render() {
return (
<div>
</div>
);
}
}
ReactDOM.render(<App headline="List of Attendees"/>,
document.getElementById('root'));
JSX

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Example
import React from 'react';
import ReactDOM from 'react-dom';
render() {
return (
<div>
</div>
);
}
}
ES6 (ECMAScript2015)

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Babel
• converts JSX into normal JavaScript
<App headline="List of Attendees"/>
React.createElement(App, {headline:" List of Attendees "});
• converts ES6 into browser's JavaScript
version
you develop in a future language version 

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Events
deletePerson(person) {
this.setState(…)
}
…
<Person name={person}
deletePerson={this.deletePerson} />
class Person extends Component {
render() {
return (
<div>
<h3>{this.props.name}</h3>
<button onClick={() => this.props.deletePerson(this.props.name)}>
delete
</button>
</div>
);
}
}

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Events

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Events

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Events
Store

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Events
Store
Events Data

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Events
DispatcherStore
ActionsComponents
(previousState, action) => newState

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Redux
all data (state) is stored in a single
store
state can be changed by actions only
new state is a copy of current state
with changes
allows time travel

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Demo

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Demo's components
App
Row
Prices Price
ReservedSeats
ReservedSeat
Button
Seat
Theatre
Stage

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Development tools
• IDE
– Atom (free)
– WebStorm (my recommendation)
– Sublime Text
– Visual Studio Code (free)
• ESLint
– syntax check, rules
• Babel

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Development tools
• webpack
– bundles code/CSS/resources in one file
"bundle.js"
• npm
– package manager
• Node.js
– JavaScript runtime

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Development tools
• Browser Extensions for
Chrome and Firefox
– React Developer Tools
– Redux DevTools

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Why Domino ?

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Domino
database
Web server (XPages / Java / REST)
security
user management
cluster / replication

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Domino
our customers have Domino
in production
all in one file (.nsf)

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React and more ?

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React Router
keeps UI in sync with the URL
lazy code loading

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React Bootstrap
Bootstrap components
as easy to use as own components
buttons,
dialog boxes,
navigation,
page layout,
forms,
…

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React Native
iOS & Android
creates real mobile apps
uses native components
learn once – write anywhere
85-90% shared code

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Relay
uses GraphQL
data declaration
aggregated queries to fetch data
automatic data consistency
optimistic updates

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Found:
Domino
Server
XPages
Browser
Java
React
& Co.
Code
Data

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Benefits
– clear separation between client and server code
– great tools for client development
– reusable components
– high performance

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Try it out!
• install node.js
• install "Create React App"
– https://github.com/facebookincubator/create-react-app
• code

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Questions ?

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Thank you!
Sources:
Pictures virtual DOM:
http://teropa.info/blog/2015/03/02/change-and-its-detection-in-javascript-frameworks.html

2016 SUTOL: React.js – High-Performance Client for Domino

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