Introduction to Angular 2

My talk about Angular 2 at #tkjs Dec 14, 2015
http://www.meetup.com/tokyojs/events/226903404/

Transcript

1. Introduction to Angular 2 Shuhei Kagawa Dec 14, 2015 #tkjs
2. Who are you? • Shuhei Kagawa • Front/Back-end developer @ M3, Inc. • Rails/Angular.js/Node.js • Building SPA >10000 lines of JavaScript
5. Choosing JS framework is hard
6. What I wanted 1.5 years • Data-binding (less boilerplate) • Amount of learning resources (for team development) • (Seemingly) Long-time support • Rich standard libraries (security, validation and etc.)
7. https://www.google.com/trends/
8. http://www.bennadel.com/blog/2439-my-experience-with-angularjs---the-super-heroic-javascript-mvw-framework.htm
9. Piled up APIs since 2009 https://en.wikipedia.org/wiki/File:Quebrada_de_Cafayate,_Salta_(Argentina).jpg
10. Angular: The Good Parts • Directive > Controller • Don't rely on scope inheritance • Directive API (controllerAs, bindToController)
12. Angular 2 • Thrown away outdated/unintuitive APIs • Completely rewritten with
13. What is Angular 2 like? • It's coming up soon(?) • Better syntax • Best-in-class performance • Cutting-edge architecture
14. alpha.53 Weekly Breaking Changes
15. beta is coming soon... Less Breaking Changes
17. Adoption at Google 100s developers
 Millions LOC
18. Better syntax • TypeScript is the first language (no more JS quirks) • Consistent template syntax • Scoped CSS • ES6 Modules (no more own module system)
19. Languages ES5 ES6 TypeScript Dart
20. ES6 Modules Class Decorator Class property import { Component, Injectable } from 'angular2/core'; @Injectable() class Hero { id: number; name: string; } @Component({ selector: 'my-app', templateUrl: './my-app.html', styleUrls: ['./my-app.css'] }) export class AppComponent { public title = 'Tour of Heroes'; public heroes = HEROES; public selectedHero: Hero; onSelect(hero: Hero) { this.selectedHero = hero; } getSelectedClass(hero: Hero) { return { selected: hero === this.selectedHero }; } } var HEROES: Hero[] = [ { "id": 11, "name": "Mr. Nice" }, // ... ];
21. <h1>{{title}}</h1> <h2>My Heroes</h2> <ul class="heroes"> <li *ngFor="#hero of heroes" (click)="onSelect(hero)" [ng-class]="getSelectedClass(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> <div><input [(ngModel)]="selectedHero.name" placeholder="name"></div> </div> </div> Text binding Loop Event handler (Seemingly)
 Two-way
 data binding
22. Template syntax • foo="bar" • [foo]="bar" • (foo)="bar()" Plain (passed as a string) Data binding (evaluated as expression) Event handler • ng-include="'hello.tpl'" • ng-href="https://google.com?q={{keyword}}"
23. Best-in-class performance • Ultra-fast change detection • View caching • One-time and offline compilation • (Change detection in Web Worker) • (Server-side rendering (Angular Universal))
24. https://www.youtube.com/watch?v=UxjgUjVpe24 http://info.meteor.com/blog/comparing-performance-of-blaze-react-angular-meteor-and-angular-2-with-meteor
25. https://www.youtube.com/watch?v=UxjgUjVpe24 http://info.meteor.com/blog/comparing-performance-of-blaze-react-angular-meteor-and-angular-2-with-meteor
26. Cutting-edge Architecture • Component-based • Uni-directional data flow • Rx.js built-in • Compatible with Immutable.js
27. import { Component } from 'angular2/core'; import { Control } from 'angular2/common'; import { Jsonp, JSONP_PROVIDERS } from 'angular2/http'; import { bootstrap } from 'angular2/platform/browser'; import { GitHubService } from './github-service'; @Component({ selector: 'my-app', templateUrl: 'app/my-app.html', styleUrls: ['app/my-app.css'] }) export class MyApp { searchText = new Control(); repos: any; constructor(private github: GitHubService) { this.repos = this.searchText.valueChanges .debounceTime(300) .flatMap(text => this.github.search(text)); ; } } bootstrap(MyApp, [JSONP_PROVIDERS, GitHubService]);
28. <h3>GitHub repositoy search</h3> <p> <input [ngFormControl]="searchText" placeholder="keyword" class="form-control"> </p> <ul class="repositories"> <li *ngFor="#repo of repos | async"> <a [href]="repo.html_url">{{repo.full_name}}</a> {{repo.stargazers_count}} stars </li> </ul>
29. import { Injectable } from 'angular2/core'; @Injectable() export class GitHubService { constructor(private jsonp: Jsonp) {} search(keyword) { return this.jsonp.get(`https://api.github.com/ search/repositories?callback=JSONP_CALLBACK&q=$ {keyword}&sort=stars`) .map(res => res.json()['data']['items']); } }
30. Upgrade from 1.x • Componentize everything • ngUpgrade • Mix ng1 components and ng2 components • ngForward • Write ng1 app with ng2 syntax
31. Libraries • ng1 libraries doesn't work on ng2 • But people started re-building popular ones with ng2 • ionic2, angular2_material, ng2-bootstrap, ng2- select and etc.
32. Browser support
34. More resources • angular.io • github.com/AngularClass/awesome-angular2 • egghead.io Angular 2 Lessons • gitter.im/angular/angular
35. Thanks! • shuhei@gihtub&npm • shuheikagawa@twitter