QCon 2015 - Thinking in components: A new paradigm for Web UI
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Slides of my talk hold at the international developer conference QCon in Rio de Janeiro in August 2015. I talked about the emerging trend of component based development (CDB) in frontend engineering. The presented examples cover similarities in current and emerging technologies applying the concept of CDB. Covered technologies are AngularJS (v1 e v2), ReactJS, Polymer, Web Components among others.
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QCon 2015 - Thinking in components: A new paradigm for Web UI
- 1. PENSANDO EM COMPONENTES: UM PARADIGMA NOVO PARA WEB UIS
- 2. Oliver Häger
- 3. 1. Introdução Uma (ultra-)breve História do Tempo
- 4. Introdução
- 5. Introdução
- 6. <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
- 7. 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 VanillaJS
- 8. <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 } $('#person-editor' ).personEditor (save); })(); </script> </body> personeditor.html jQueryPlugin
- 9. function PersonEditor(saveCallback){ var _personData = {}; this.render = function(target){ var form = document.createElement('form'); // create elements here ... saveButton.addEventListener('click', function(event){ saveCallback(_personData); }); form.appendChild(inputFirstName); form.appendChild(inputLastName); form.appendChild(saveButton); target.appendChild(form); } } (function($){ $.fn.personEditor = function(saveCallback){ this.each( function() { var editor = new PersonEditor(saveCallback); editor.render(this); }); }; })(jQuery); personeditor.plugin.js jQueryPlugin
- 10. AngularJS <form name="person-editor" ng-controller ="personeditorController" > <h2>Person Editor </h2> <label for="firstName" >First Name</label> <input id="firstName" class="form-control" type="text" ng-model=" person.firstName" /> <label for="lastName">Last Name</label> <input id="lastName" class="form-control" type="text" ng-model=" person.lastName" /> <!-- ... --> <button type="button" class="btn btn-success" ng-click="save ($event)">Save</button> </form> personeditor.html
- 11. 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 }; $http(req). then(function(){ // handle response }, console.error); } }); personeditor.controller.js AngularJS
- 12. 2. Componentes O novo paradigma
- 13. Componentes
- 14. Componentes
- 15. Componentes
- 17. <div class="container" > <editor-frame title="Person" onsave="savePerson" > <person-editor></person-editor> </editor-frame> <editor-frame title="Product" onsave="saveProduct" > <product-editor></product-editor> </editor-frame> </div> AngularDirectives
- 18. <h2>{{title}}</h2> <div class="form-group" ng-transclude ></div> <button class="btn btn-success" ng-click="requestSave (editorModel )" >Save</button> editorframe.html AngularDirectives
- 19. angular.module('app.components.editorframe' , []) .directive('editorFrame' , function() { return { templateUrl : 'components/ng/editorframe.html' , transclude: true, scope : { title : '@', onsave : '=' }, controller : function($scope){ $scope. editorModel = {}; this.updateModel = function(model){ $scope. editorModel = model; }; $scope.requestSave = function(editorModel) { $scope. onsave(editorModel) ; }; } }; }); editorframe-component.js AngularDirectives
- 20. <div class="row"> <div class="col-lg-6 col-sm-6" > <label> First Name</label> <input class="form-control" type="text" ng-change="changed()" ng-model="person.firstName" /> </div> <div class="col-lg-6 col-sm-6" > <label> Last Name</label> <input class="form-control" type="text" ng-change="changed()" ng-model="person.lastName" /> </div> <div class="col-lg-6 col-sm-6" > <label> E-Mail</label> <input class="form-control" type="email" ng-change="changed()" ng-model="person.email" /> </div> </div> person-editor-component.html AngularDirectives
- 21. angular.module('app.components.personeditor' , ['app.components. editorframe' ]) .directive('personEditor' , function($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
- 22. Bibliotéca para View Performático Sem dependências Facebook (e Instagram) ReactJS
- 23. 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
- 24. 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/> <buttonclassName="btn" onClick={this.onSave}>Save</button> </div> </div> ) } } ); editor-frame.jsx ReactJS
- 25. 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 }, 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 ReactJS
- 26. Bibliotéca para View Criado em cima da especificação Web Components Google Catálogo de componentes tipo Material Design Polymer
- 27. 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 Polymer
- 28. 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) Polymer
- 29. 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) Polymer
- 30. 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) Polymer
- 31. 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 Polymer
- 32. 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 Polymer
- 34. Componentização Encapsulamento DOM CSS Javascript Lifecycle Virtual DOM Shadow (Shady) DOM Scoped Styles Dados Compartilhados Instâncias
- 35. Pensar em componentes Fluxo de dados Arquitetura Desafios
- 37. Crescimento descontrolado Black Box Desenvolvimento Inicial Riscos
- 38. 3. Outlook The next big thing?
- 39. Specificação W3C Conjunto de 4 Sub-Specificações Templates Imports Custom Elements Shadow DOM WebComponents #document-fragment <my-awesome-element/> <link rel=”import”/> <template/>
- 41. 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> <!-- The app component --> <my-app></my-app> <script> System.import( 'app');</script> </body> </html>
- 42. Angular2.0 @Component({ selector: 'my-app' }) @View({ template: '<h1>Hello {{ name }}</h1>' }) // Component controller class MyAppComponent { name: string; constructor() { this.name = 'Alice'; } } bootstrap(MyAppComponent) ;