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El viaje de Angular 1 a Angular2

El viaje de Angular 1 a Angular2

Charla dada dentro de la Semana del Impulso TIC
DevFest Asturias, GDG Asturias
Avilés, Centro Niemeyer, 3 de noviembre de 2016

Angular 1 estaba muerto, en el verano de 2015 nadie quería programar. Sobre todo porque iba a salir Angular 2.
¿Qué hizo que esto cambiase? La salida de Angular 1.5 y la nueva arquitectura de componentes hizo que volviese a la vida y que el cambio a Angular 2 fuera mucho más simple.

Antonio de la Torre Fernández

November 03, 2016

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  1. El viaje de Angular1 a Angular2 Antonio de la Torre

    #DevFestAsturias 03/11/2016 @adelatorrefoss
  2. Angular “AngularJS is a structural framework for dynamic web apps.

    It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you would otherwise have to write. Angular teaches the browser new syntax through a construct we call directives.“ https://docs.angularjs.org/guide/introduction
  3. ¿Qué aporta Angular? • Completo. • Te ahorra la fontanería.

    • Bien documentado. • Mucha comunidad. • Patrón reconocido MVC. • ES6. • Opinionado (pero si no te gusta tengo otra)
  4. from angular.module('directives') .directive('pony', function(){ return { scope: { name: '='

    }, controllerAs: 'vm', controller: function($scope){ var vm = this; vm.name = $scope.name; // we have to add a watcher on $scope.name to make this work $scope.$watch('name', function(newName){ vm.name = newName; }); }, template: '<p>{{vm.name}}</p>' } });
  5. to angular.module('directives') .directive('pony', function(){ return { bindToController: { name: '='

    }, controllerAs: 'vm', scope: true, controller: function(){}, template: '<p>{{vm.name}}</p>' } });
  6. Three Principles of Redux Single source of truth The state

    of your whole application is stored in an object tree within a single store. State is read-only The only way to change the state is to emit an action, an object describing what happened. Changes are made with pure functions To specify how the state tree is transformed by actions, you write pure reducers. http://redux.js.org/docs/introduction/ThreePrinciples.html
  7. “The Javascript pendulum has swung from restrictive, monolithic frameworks to

    modular, boilerplate-hindered libraries.” Eric Clemmons https://medium.com/@ericclemmons/javascript-fatigue-48d4011b6fc4#.nzcp66xkh
  8. Don’t try to know everything – it’s impossible in modern

    web development. I find it important to remain human. Don’t overdo discipline, don’t become a life improvement machine. Periods of boredom and doing nothing are important for recuperating and inspiration. Axel Rauschmayer http://www.2ality.com/2016/02/js-fatigue-fatigue.html
  9. Guías de estilo de John Papa y Todd Motto para

    Angular 1.4 mejoró la situación https://github.com/johnpapa/angular-styleguide/blob/master/a1/README.md https://github.com/toddmotto/angular-styleguide
  10. Angular 1 Changelog 1.3.0 superluminal-nudge (2014-10-13) 1.4.0 jaracimrman-existence (2015-05-26) 1.3.20

    shallow-translucence (2015-09-29) 1.5.0 ennoblement-facilitation (2016-02-05) 1.2.30 patronal-resurrection (2016-07-21) only version branch that supports IE8 1.5.8 arbitrary-fallbacks (2016-07-22) 1.4.13 croaking-elderweed (2016-10-10) 1.6.0-rc.0 bracing-vortex (2016-10-26) https://github.com/angular/angular.js/blob/master/CHANGELOG.md
  11. Angular 2 Changelog 2.0.0-alpha.27 (2015-06-17) 2.0.0-alpha.55 (2015-12-15) 2.0.0-beta.17 (2016-04-28) 2.0.0-rc.0

    (2016-05-02) 2.0.0-rc.7 (2016-09-13) 2.0.0 proprioception-reinforcement (2016-09-14) https://github.com/angular/angular/blob/master/CHANGELOG.md 2.1.0 incremental-metamorphosis (2016-10-12) 2.2.0-beta.1 (2016-10-27) 2.1.2 (2016-10-27)
  12. La arquitectura de componentes • Solo controlan su propia vista

    y datos • Tienen una API bien definida • Una aplicación es un árbol de componentes • Eliminó la magia negra de las directivas • No hace falta conocer el ciclo de compilación a fondo • No es necesario acceder al $scope
  13. Migrating from 1.4 to 1.5 https://docs.angularjs.org/guide/migration Angular 1.5 takes a

    big step towards preparing developers for a smoother transition to Angular 2 in the future. Architecting your applications using components, multi-slot transclusion, one-way bindings in isolate scopes, using lifecycle hooks in directive controllers and relying on native ES6 features (such as classes and arrow functions) are now all possible with Angular 1.5.
  14. Guía de estilo Angular 1.5 de Todd Motto Scope -

    Stateful components - Stateless components Directives - Directives should be used solely for decorating the DOM. Eventos - Comunicación con el padre por eventos. $event
  15. Pasar datos de componentes hacia arriba: About events https://toddmotto.com/angular-1-5-lifecycle-hooks Okay,

    bear with me, we’re in the final phase. This is where things get… interesting. Instead of just passig back this.user into the function, we’re going to fake an $event Object, which complies with how Angular 2 does this (using EventEmitter), and also provides global consistency between your templates to fetch data back through the
  16. El lío del router • ngRoute para v1.4 • ngComponentRouter

    para v1.5 • RouterModule para v2 • ui-router (estándar de facto en todas)
  17. Ventajas • Componentes • Independiente de la plataforma • Web

    workers • Server side rendering • Typescript • Rx http://slides.com/gruizdevilla/angular-2-workshop#/ https://www.youtube.com/watch?v=7vSPfmHWIjA
  18. Ventajas • ES6 (Módulos y clases) • No ng-class, no

    ng-click, all are DOM native attributes. An Angular 2 Force Awakens - John Papa Ng Conf 2016 4 May
  19. some code... <html> <head> <title>Angular 2</title> </head> <!-- ... -->

    <body> <my-app>Loading...</my-app> </body> </html> https://angular.io/docs/ts/latest/tutorial/toh-pt1.html
  20. some code... import { Component } from '@angular/core'; export class

    Hero { id: number; name: string; } @Component({ selector: 'my-app', template: ` <h1>{{title}}</h1> <h2>{{hero.name}} details!</h2> <div><label>id: </label>{{hero.id}}</div> <div> <label>name: </label> <input [(ngModel)]="hero.name" placeholder="name"> </div> `}) export class AppComponent { title = 'Tour of Heroes'; hero: Hero = { id: 1, name: 'Windstorm' }; }
  21. some code... import { Component } from '@angular/core'; export class

    Hero { id: number; name: string; } const HEROES: Hero[] = [ { id: 11, name: 'Mr. Nice' },...]; @Component({ selector: 'my-app', template: ` <h1>{{title}}</h1> <h2>My Heroes</h2> <ul class="heroes"> <li *ngFor="let hero of heroes" [class.selected]="hero === selectedHero" (click)="onSelect(hero)"> <span class="badge">{{hero.id}}</span> {{hero.name}} </li> </ul> <div *ngIf="selectedHero"> <h2>{{selectedHero.name}} details!</h2> <div><label>id: </label>{{selectedHero.id}}</div> <div> <label>name: </label> <input [(ngModel)]="selectedHero.name" placeholder="name"/> </div> </div> `, styles: [`...`] }) export class AppComponent { title = 'Tour of Heroes'; heroes = HEROES; selectedHero: Hero; onSelect(hero: Hero): void { this.selectedHero = hero; } }
  22. Angular 2 Style Guide by John Papa The Angular 2

    Style Guide https://github.com/johnpapa/angular-styleguide/blob/master/a2/README.md “The Angular 2 Style Guide has been moved to the Official Angular 2 docs.”
  23. Angular 2 migration guide by Todd Motto “Convert your Angular

    1 knowledge into Angular 2. Select a topic and start learning!” http://ngmigrate.telerik.com/
  24. Angular + Redux Managing state with Redux and Angular 1

    http://blog.rangle.io/managing-state-redux-angular/ Angular 1.x Redux: Introduction https://egghead.io/courses/getting-started-with-redux Build Redux Style Applications with Angular2, RxJS, and ngrx/store https://egghead.io/courses/building-a-time-machine-with-angular-2-and-rxjs