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Building Universal Applications with Angular 2 Minko Gechev github.com/mgechev twitter.com/mgechev blog.mgechev.com

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github.com/mgechev twitter.com/mgechev blog.mgechev.com

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Agenda What is Angular? What’s wrong with Angular 2? Introduction to Angular 2 Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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Agenda What is Angular 2? What’s wrong with Angular 2? What are the core concepts of Angular 2? Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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Agenda What is Angular 2? What’s wrong with Angular 2? What are the core concepts of Angular 2? Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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Agenda What is Angular 2? What’s wrong with Angular 2? What are the core concepts of Angular 2? Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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Agenda What is Angular 2? What’s wrong with Angular 2? What are the core concepts of Angular 2? Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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Agenda What is Angular 2? What’s wrong with Angular 2? What are the core concepts of Angular 2? Why Angular 2 is awesome? Should I use Angular 2 in my next project?

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What is Angular 2?

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Core concepts of Angular 2 • Directives • Components • Pipes • Services • Dependency Injection

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Directives

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Primitive used for encapsulation of basic UI related logic

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tooltip.ts @Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) export class Tooltip { private overlay:Overlay; private tooltip:string; constructor(private el:ElementRef, manager: OverlayManager) { this.el = el; this.overlay = manager.get(); } onMouseEnter() { this.overlay.open(this.el, this.tooltip); } onMouseLeave() { this.overlay.close(); } }

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tooltip.ts @Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) export class Tooltip { private overlay:Overlay; private tooltip:string; constructor(private el:ElementRef, manager: OverlayManager) { this.el = el; this.overlay = manager.get(); } onMouseEnter() { this.overlay.open(this.el, this.tooltip); } onMouseLeave() { this.overlay.close(); } }

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tooltip.ts @Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) export class Tooltip { private overlay:Overlay; private tooltip:string; constructor(private el:ElementRef, manager: OverlayManager) { this.el = el; this.overlay = manager.get(); } onMouseEnter() { this.overlay.open(this.el, this.tooltip); } onMouseLeave() { this.overlay.close(); } }

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Wait a minute… this looks like Java

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Angular 2 is written in TypeScript

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TypeScript is…

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superset of ECMAScript

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optional type checking

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open source

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…you can still use ES5…

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tooltip.js var Tooltip = ng.Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) .Class({ constructor: [ng.Inject(ng.ElementRef), ng.Inject(OverlayManager), function (tooltip, el, manager) { this.el = el; this.overlay = manager.get(tooltip); }], onMouseEnter() { this.overlay.open(this.el, this.tooltip); }, onMouseLeave() { this.overlay.close(); } });

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tooltip.js var Tooltip = ng.Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) .Class({ constructor: [ng.Inject(ng.ElementRef), ng.Inject(OverlayManager), function (tooltip, el, manager) { this.el = el; this.overlay = manager.get(tooltip); }], onMouseEnter() { this.overlay.open(this.el, this.tooltip); }, onMouseLeave() { this.overlay.close(); } });

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tooltip.js var Tooltip = ng.Directive({ selector: '[tooltip]', inputs: ['tooltip'], host: { '(mouseenter)': 'onMouseEnter()', '(mouseleave)': 'onMouseLeave()' } }) .Class({ constructor: [ng.Inject(ng.ElementRef), ng.Inject(OverlayManager), function (tooltip, el, manager) { this.el = el; this.overlay = manager.get(tooltip); }], onMouseEnter() { this.overlay.open(this.el, this.tooltip); }, onMouseLeave() { this.overlay.close(); } });

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Components

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Directives with views

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hello-world.ts @Component({ selector: 'hello-world', template: '

Hello, {{this.target}}!

' }) class HelloWorld { target:string; constructor() { this.target = 'world'; } }

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hello-world.ts @Component({ selector: 'hello-world', template: '

Hello, {{this.target}}!

' }) class HelloWorld { target:string; constructor() { this.target = 'world'; } }

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hello-world.ts @Component({ selector: 'hello-world', template: '

Hello, {{this.target}}!

' }) class HelloWorld { target:string; constructor() { this.target = 'world'; } }

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Pipes

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Encapsulate the data transformation logic

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lowercase-pipe.ts @Pipe({ name: 'lowercase' }) class LowerCasePipe implements PipeTransform { transform(value: string): string { if (!value) return value; if (typeof value !== 'string') { throw new Error('Invalid pipe value', value); } return value.toLowerCase(); } }

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Services

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Simply, ES2015 classes which can be wired together with…

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Dependency Injection

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di.ts import { provide, Injector, Injectable } from 'angular2/angular2'; class Http {} @Injectable() class DataMapper { constructor(private http: Http) {} } let injector = Injector.resolveAndCreate([ provide(Http, { useValue: new Http() }), DataMapper ]); injector.get(DataMapper);

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di.ts import { provide, Injector, Injectable } from 'angular2/angular2'; class Http {} @Injectable() class DataMapper { constructor(private http: Http) {} } let injector = Injector.resolveAndCreate([ provide(Http, { useValue: new Http() }), DataMapper ]); injector.get(DataMapper);

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di.ts import { provide, Injector, Injectable } from 'angular2/angular2'; class Http {} @Injectable() class DataMapper { constructor(private http: Http) {} } let injector = Injector.resolveAndCreate([ provide(Http, { useValue: new Http() }), DataMapper ]); injector.get(DataMapper);

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di.ts import { provide, Injector, Injectable } from 'angular2/angular2'; class Http {} @Injectable() class DataMapper { constructor(private http: Http) {} } let injector = Injector.resolveAndCreate([ provide(Http, { useValue: new Http() }), DataMapper ]); injector.get(DataMapper);

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Now you know the basics!

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Lets take a step back…

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Angular 2 is platform agnostic

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Not coupled with DOM, even HTML

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…and even more…

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Client Server

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Client Server

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Client Server GET / GET * loop

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Client Server GET / GET * loop Running JavaScript

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Client Server GET / GET * loop GET * loop

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Client Server GET / GET * loop GET * loop

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server-side rendering

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Client Server

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Client Server

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Client Server GET /

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Client Server GET / Running JavaScript

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Client Server GET / GET * loop

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Client Server GET / GET * loop Running JavaScript

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Client Server GET / GET * loop

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Change detection can be run into separate process

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so…what’s wrong with Angular 2?

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Google

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Google Angular 1

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Angular 2 Google Angular 1

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Angular 2 is…

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rewritten from scratch

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…developed in a different language

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…completely incompatible API

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…brand new building blocks

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Why?

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Web have moved forward

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WebWorkers

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Learnt lessons

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Mutable state

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Tangled data-flow

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…we will make the transition process boring…

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ngUpgrade

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How to migrate to Angular 2? (2 easy steps)

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Step 1

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A B C D E F

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Step 2

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Thank you! github.com/mgechev twitter.com/mgechev blog.mgechev.com