QCon 2015 - Thinking in components: A new paradigm for Web UI

PENSANDO EM
COMPONENTES: UM
PARADIGMA NOVO PARA
WEB UIS

1. Introdução
Uma (ultra-)breve História do Tempo

<form name="person-editor" >
<h2>Person Editor </h2>
<label for="firstName" >First Name</label>
<input id="firstName" class="form-control" type="text"
onchange="changed(event)"/>
<label for="lastName">Last Name</label>
<input id="lastName" class="form-control" type="text"
onchange="changed(event)"/>

<button type="button" class="btn btn-success" onclick="save
(event)">Save</button>
</form>
personeditor.html
VanillaJS

<head>
<script src="js/lib/jquery.js" ></script>
<script src="js/person.editor.plugin.js" ></script>
</head>
<body>
<div id="person-editor" ></div>
<script>
(function(){
function save(data){
// ... send to server
}
$('#person-editor' ).personEditor (save);
})();
</script>
</body>
personeditor.html
jQueryPlugin

AngularJS
<form name="person-editor" ng-controller ="personeditorController" >
<h2>Person Editor </h2>
<label for="firstName" >First Name</label>
<input id="firstName" class="form-control" type="text" ng-model="
person.firstName" />
<label for="lastName">Last Name</label>
<input id="lastName" class="form-control" type="text" ng-model="
person.lastName" />

<button type="button" class="btn btn-success" ng-click="save
($event)">Save</button>
</form>
personeditor.html

app.controller("personeditorController" , function($scope, $http){
$scope.person = {};
$scope.save = function(event){
var req = {
method: 'POST',
url: 'http://example.com/api/v1/person' ,
headers: {
'Content-Type' : 'application/json'
},
data: $scope.person
};
$http(req). then(function(){
// handle response
}, console.error);
}
});
personeditor.controller.js
AngularJS

2. Componentes
O novo paradigma

combinável
reutilizável
Componentes

<div class="container" >
<editor-frame title="Person" onsave="savePerson" >
<person-editor></person-editor>
</editor-frame>
<editor-frame title="Product" onsave="saveProduct" >
<product-editor></product-editor>
</editor-frame>
</div>
AngularDirectives

<h2>{{title}}</h2>
<div class="form-group" ng-transclude ></div>
<button class="btn btn-success" ng-click="requestSave (editorModel )"
>Save</button>
editorframe.html
AngularDirectives

angular.module('app.components.editorframe' , [])
.directive('editorFrame' , function() {
return {
templateUrl : 'components/ng/editorframe.html' ,
transclude: true,
scope : {
title : '@',
onsave : '='
},
controller : function($scope){
$scope. editorModel = {};
this.updateModel = function(model){
$scope. editorModel = model;
};
$scope.requestSave = function(editorModel) {
$scope. onsave(editorModel) ;
};
}
};
});
editorframe-component.js
AngularDirectives

<div class="row">
<div class="col-lg-6 col-sm-6" >
<label> First Name</label>
<input class="form-control" type="text" ng-change="changed()"
ng-model="person.firstName" />
</div>
<label> Last Name</label>
<input class="form-control" type="text" ng-change="changed()"
ng-model="person.lastName" />
</div>
<label> E-Mail</label>
<input class="form-control" type="email" ng-change="changed()"
ng-model="person.email" />
</div>
</div>
person-editor-component.html
AngularDirectives

angular.module('app.components.personeditor' , ['app.components.
editorframe' ])
.directive('personEditor' , function($rootScope) {
return {
require : "^editorFrame" ,
restrict : "AE",
scope : {
} ,
templateUrl : 'components/ng/person-editor-directive.html' ,
link : function($scope, element, attrs, frameCtrl)
{
$scope. changed = function(){
frameCtrl. updateModel ($scope.person);
}
}
};
});
person-editor-component.js
AngularDirectives

Bibliotéca para View
Performático
Sem dependências
Facebook (e Instagram)
ReactJS

Mostrar custom elementvar ReactApp = React. createClass ({
saveCustomer : function(customer) { /* ... */ },
saveProduct : function(product){ /* ... */ },
render: function () {
return (
<div>
<EditorFrame title="Customer Editor" onSave={this.saveCustomer }>
<CustomerEditor/>
</EditorFrame>
<EditorFrame title="Product Editor" onSave={this.saveProduct }>
<ProductEditor/>
</EditorFrame>
</div>
)
}
})
react-app.jsx
ReactJS

Mostrar custom elementvar EditorFrame = React.createClass(
{
propTypes: {
title: React.PropTypes.string.isRequired,
onSave: React.PropTypes.func.isRequired
},
getInitialState : function(){ return {data : {}}; },
change : function(data){ this.state.data = data; },
onSave: function (event) { this.props.onSave(this.state.data); },
// intercept the change callback
this.props.children.props.onChange = this.change;
return (
<div className="panel">
<h3 className="panel-title">{this.props.title}</h3>
<div className="panel-body">
{this.props.children}
<hr/>
<buttonclassName="btn" onClick={this.onSave}>Save</button>
</div>
</div>
)
}
}
);
editor-frame.jsx
ReactJS

Mostrar custom element
var CustomerEditor = React.createClass({
PropTypes: {
onChange : React.PropTypes.func.isRequired
},
getInitialState : function(){ return {data: {}}; },
editorDataChanged: function (event) {
this.state.data[event.target.name] = event.target.value;
this.props.onChange(this.state.data); // propagate data model
},
return (
<div>
<div className="form-group">
<input name="name" className="form-control" type="text"
onChange={this.editorDataChanged}/>
</div>
<div className="form-group">
<input name="email" className="form-control" type="text"
onChange={this.editorDataChanged}/>
</div>
</div>
)
}
});
customer-editor.jsx
ReactJS

Bibliotéca para View
Criado em cima da especificação
Web Components
Google
Catálogo de componentes tipo
Material Design
Polymer

<section data-route= "editor">
<paper-material elevation="1">
<editor-frame title="Person Editor" >
<editor-content-person/>
</editor-frame>
</paper-material>
<paper-material elevation="1">
<editor-frame title="Address Editor" >
<editor-content-address/>
</editor-frame>
</paper-material>
</section>
index.html
Polymer

Mostrar custom element<link rel="import" href="/bower_components/paper-button/paper-button.html" >
<link rel="import" href="../common/message-dialog.html" >
<dom-module id="editor-frame" >
<style>

</style>
<template>
<h1 class="paper-font-display1" ><span>{{title}}</span></h1>
<div id="content">
<content></content>
</div>
<paper-button class="button" on-click="save" raised>Save</paper-button>
<message-dialog id="dialog" title="Saved Data" message="[[editorData]]"
></message-dialog>
</template>
<script>

</script>
</dom-module>
Polymer

Mostrar custom element<script>
(function () {
Polymer({
is: 'editor-frame' ,
properties: {
editorData: String,
title: {
type: String,
notify: true
}
},
ready: function() {
this.addEventListener ('changed-model' , this.updateModel );
},
updateModel : function(event){
this.editorData = JSON.stringify(event.detail.model);
},
save: function () {
this.$.dialog.open();
}
});
})();
</script>
Polymer

Mostrar custom element<link rel="import" href="/bower_components/paper-input/paper-input.html" >
<link rel="import" href="editor-content-behaviour.html" >
<dom-module id="editor-content-person" >
<style>

</style>
<template>
<paper-input class="width-50" name="firstName" label="First Name" on-
change="handleChange" ></paper-input>
<paper-input class="width-50" name="lastName" label="Last Name" on-
change="handleChange" ></paper-input>
</template>
<script>
(function () {
"use strict" ;
Polymer({
is: 'editor-content-person' ,
behaviors : [EditorContentBehavior ]
});
})();
</script>
</dom-module>
editor-content-person.html
Polymer

3. Componentização
Novos mundos

Componentização
Encapsulamento
DOM
CSS
Javascript
Lifecycle
Virtual DOM
Shadow (Shady) DOM
Scoped Styles
Dados Compartilhados
Instâncias

Pensar em componentes
Fluxo de dados
Arquitetura
Desafios

Reusabilidade
Manutenibilidade
Robustez
Produtividade
Ganhos

Crescimento descontrolado
Black Box
Desenvolvimento Inicial
Riscos

3. Outlook
The next big thing?

Specificação W3C
Conjunto de 4 Sub-Specificações
Templates
Imports
Custom Elements
Shadow DOM
WebComponents
#document-fragment
<my-awesome-element/>
<link rel=”import”/>
<template/>

WebComponents
Templates
Imports
Custom Elements
Shadow DOM

Angular2.0
<html>
<head>
<title>Angular 2 Quickstart </title>
<script src="https://github.jspm.io/jmcriffey/bower-traceur-runtime@0.0.87
/traceur-runtime.js" ></script>
<script src="https://jspm.io/system@0.16.js" ></script>
<script src="https://code.angularjs.org/2.0.0-alpha.28/angular2.dev.js"
></script>
</head>
<body>

<my-app></my-app>
<script> System.import( 'app');</script>
</body>
</html>

Angular2.0
@Component({
selector: 'my-app'
})
@View({
template: '<h1>Hello {{ name }}</h1>'
})
// Component controller
class MyAppComponent {
name: string;
constructor() {
this.name = 'Alice';
}
}
bootstrap(MyAppComponent) ;

AuraJS
Aurelia
FlightJS
MithrilJS
SkateJS
...
Outros

oliver@devbutze.com
oliver.hager@dextra-sw.com
https://br.linkedin.com/in/oliverhager
Thnx!
Questions!

QCon 2015 - Thinking in components: A new paradigm for Web UI

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