PENSANDO EM COMPONENTES: UM PARADIGMA NOVO PARA WEB UIS
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PENSANDO EM COMPONENTES: UM PARADIGMA NOVO PARA WEB UIS
Oliver Häger
1. Introdução Uma (ultra-)breve História do Tempo
Intr
oduç
ão
Intr
oduç
ão
<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
Van
illa
JS
var httpRequest = new XMLHttpRequest() ;var person = {};
function changed(event){ person[event. target.id] = event.target.value;}
function save(){ httpRequest.onreadystatechange = function(){/* ... */}; httpRequest.open("POST", "http://www.neolithic.com/person" ); httpRequest.setRequestHeader ('Content-Type' , 'application/json' ); httpRequest.send( JSON.stringify(person) );}
personeditor.js
Van
illa
JS
<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 }
$('#person-editor' ).personEditor(save); })();</script></body>
personeditor.html
jQue
ry P
lugi
n
function PersonEditor(saveCallback){
var _personData = {};
this.render = function(target){ var form = document.createElement('form');
// create elements here ...
saveButton.addEventListener('click', function(event){ saveCallback(_personData); }); form.appendChild(inputFirstName); form.appendChild(inputLastName); form.appendChild(saveButton); target.appendChild(form); }}
(function($){ $.fn.personEditor = function(saveCallback){ this.each( function() { var editor = new PersonEditor(saveCallback); editor.render(this); }); };})(jQuery);
personeditor.plugin.js
jQue
ry P
lugi
n
Ang
ular
JS
<form name="person-editor" ng-controller="personeditorController" ><h2>Person Editor</h2>
<label for="firstName">First Name</label><input id="firstName" class="form-control" type="text" ng-model="
person.firstName" />
<label for="lastName">Last Name</label><input id="lastName" class="form-control" type="text" ng-model="
person.lastName" /> <!-- ... -->
<button type="button" class="btn btn-success" ng-click="save($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 };
$http(req).then(function(){ // handle response }, console.error);
}});
personeditor.controller.js
Ang
ular
JS
2. Componentes O novo paradigma
Com
pone
ntes
Com
pone
ntes
Com
pone
ntes
combinável
reutilizável
Com
pone
ntes
<div class="container"><editor-frame title="Person" onsave="savePerson">
<person-editor></person-editor> </editor-frame>
<editor-frame title="Product" onsave="saveProduct"> <product-editor></product-editor>
</editor-frame></div>A
ngul
ar D
irec
tive
s
<h2>{{title}}</h2><div class="form-group" ng-transclude></div><button class="btn btn-success" ng-click="requestSave(editorModel)">Save</button>
editorframe.html
Ang
ular
Dir
ecti
ves
angular.module('app.components.editorframe' , []) .directive('editorFrame', function() { return { templateUrl: 'components/ng/editorframe.html' , transclude: true, scope : { title : '@', onsave : '=' }, controller : function($scope){ $scope. editorModel = {};
this.updateModel = function(model){ $scope. editorModel = model; };
$scope.requestSave = function(editorModel) { $scope. onsave(editorModel); }; } }; });
editorframe-component.js
Ang
ular
Dir
ecti
ves
<div class="row"> <div class="col-lg-6 col-sm-6" > <label> First Name</label> <input class="form-control" type="text" ng-change="changed()" ng-model="person.firstName" /> </div> <div class="col-lg-6 col-sm-6" > <label> Last Name</label> <input class="form-control" type="text" ng-change="changed()" ng-model="person.lastName" /> </div> <div class="col-lg-6 col-sm-6" > <label> E-Mail</label> <input class="form-control" type="email" ng-change="changed()" ng-model="person.email" /> </div></div>
person-editor-component.html
Ang
ular
Dir
ecti
ves
angular.module('app.components.personeditor' , ['app.components.editorframe'])
.directive('personEditor' , function($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
Ang
ular
Dir
ecti
ves
Bibliotéca para ViewPerformático
Sem dependências
Facebook (e Instagram)
Rea
ctJS
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
Rea
ctJS
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); },
render: function () { // 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/> <button className="btn" onClick={this.onSave}>Save</button> </div> </div> ) } });
editor-frame.jsx
Rea
ctJS
Mostrar custom elementvar 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 },
render: function () { 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
Rea
ctJS
Bibliotéca para View
Criado em cima da especificação Web Components
Catálogo de componentes tipo Material Design
Poly
mer
Mostrar custom element
<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
Poly
mer
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> :host { display: block; } .button { margin-top: 1em; } @media (max-width: 600px) { h1.paper-font-display1 { font-size: 24px; } } </style>
<template><!-- part 2 -->
</template>
<script><!-- part 3 -->
</script></dom-module>
editor-frame.html (1/3)
Poly
mer
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>
<!-- part 1 --> </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><!-- part 3 -->
</script></dom-module>
editor-frame.html (2/3)
Poly
mer
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>
editor-frame.html (3/3)
Poly
mer
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>
<!-- encapsulated 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
Poly
mer
Mostrar custom element
<script> EditorContentBehavior = {
properties: { model : { type: Object, value : function () { return {}; } // not shared among instances } },
handleChange : function(e){ this.model[e.target.name] = e.target.value; this.fire('changed-model' , {model : this.model}); } };</script>
editor-content-behavior.html
Poly
mer
3. Componentização Novos mundos
Com
pone
ntiz
ação
EncapsulamentoDOM
CSSJavascript
Lifecycle
Virtual DOMShadow (Shady) DOM
Scoped Styles
Dados CompartilhadosInstâncias
Pensar em componentes
Fluxo de dados
Arquitetura
Des
afio
s
Reusabilidade
ManutenibilidadeRobustez
Produtividade
Gan
hos
Crescimento descontrolado
Black Box
Desenvolvimento Inicial
Ris
cos
3. Outlook The next big thing?
Specificação W3C Conjunto de 4 Sub-Specificações
TemplatesImports
Custom ElementsShadow DOM
Web
Com
pone
nts
#document-fragment
<my-awesome-element/>
<link rel=”import”/><template/>
Web
Com
pone
nts
Templates
Imports
Custom Elements
Shadow DOM
Ang
ular
2.0
<html><head> <title>Angular 2 Quickstart </title> <script src="https://github.jspm.io/jmcriffey/[email protected]/traceur-runtime.js" ></script> <script src="https://jspm.io/[email protected]" ></script> <script src="https://code.angularjs.org/2.0.0-alpha.28/angular2.dev.js"></script></head><body> <!-- The app component --> <my-app></my-app> <script>System.import( 'app');</script></body></html>
Ang
ular
2.0
@Component({ selector: 'my-app'})@View({ template: '<h1>Hello {{ name }}</h1>'})
// Component controllerclass MyAppComponent { name: string; constructor() { this.name = 'Alice'; }}
bootstrap(MyAppComponent) ;
AuraJSAurelia
FlightJSMithrilJSSkateJS
...
Out
ros
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