Micro-Apps and Angular Elements -- Talk from ngGraz, Sep. 2018

@ManfredSteyer Maintainable Client Architecture w/ Micro-Apps and Angular Elements Manfred
Steyer SOFTWAREarchitekt.at ManfredSteyer

@ManfredSteyer About me… • Manfred Steyer • SOFTWAREarchitekt.at • Angular
Trainings and Consultancy • Google Developer Expert (GDE) Page ▪ 2 Manfred Steyer Public: Vienna, München, Zürich In-House: everywhere http://www.softwarearchitekt.at

@ManfredSteyer ✓ Commodore 64 ✓ 1982 ✓ ~ 1 MHz
✓ 64 KB RAM ✓ Disks with 170 KB

@ManfredSteyer Version with two cores ;-) Challenge: Resources!

@ManfredSteyer Challenges today: Complexity

@ManfredSteyer There are milk products lasting longer than some JavaScript
frameworks

@ManfredSteyer Contents 1) Micro Apps 2) Web Components 3) Implementation
w/ Angular 4) DEMO 5) Recipes

@ManfredSteyer 1) Micro Apps

@ManfredSteyer Idea System

@ManfredSteyer Idea µService µService µService

@ManfredSteyer Idea µApp µApp µApp

@ManfredSteyer Folie▪ 18 Pro Contra

@ManfredSteyer UI Composition w/ Hyperlinks µApp SPA µApp SPA µApp
SPA

@ManfredSteyer

@ManfredSteyer ✓ Simple  Loosing State  Load a new
Application

@ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp
Shell ✓ iframes ✓ Bootstrapping several SPAs ✓ Web Components

@ManfredSteyer 2) Web Components

@ManfredSteyer Framework independent Components

@ManfredSteyer Can be dynamically loaded into the browser!

@ManfredSteyer Umbrella Term for several Standards

@ManfredSteyer Standards Templates HTML Imports Custom Elements Shadow DOM

@ManfredSteyer Custom Elements Custom HTML-Element, e. g. <date-picker> Behaves like
build-in ones Write once; consume with any framework Can be polyfilled for all current browser

@ManfredSteyer Examples <slider min="0" max="100"> … <customer-selector selected="selected()"> … <my-micro-app
state="sharedState" message="handle(…)">…

@ManfredSteyer Shadow DOM Isolate CSS Parent cannot influence Component's layout
Component cannot influence Parent or Siblings Can be emulated for all current browsers (w/ limitations)

@ManfredSteyer µService µApp3 µApp2 µApp1 Shell Web Components for Macro-Architecture
Shared Widget Shared Widget Shared Widget Web Components for Micro-Architecture

@ManfredSteyer 3) Implementation with Angular

@ManfredSteyer Shadow DOM • Baked-in • Emulation • @Component({ encapsulation:
ViewEncapsulation.Emulated }) • Default • Shadow DOM • @Component({ encapsulation: ViewEncapsulation.Native }) • Can be turned off: • @Component({ encapsulation: ViewEncapsulation.None })

@ManfredSteyer Custom Elements Angular Elements Wraps Angular Component Expose Custom
Element

@ManfredSteyer MicroApp as Angular Elements @NgModule({ imports: [BrowserModule], declarations: [MicroAppComponent],
bootstrap: [], entryComponents: [MicroAppComponent] }) export class AppModule { }

bootstrap: [], entryComponents: [MicroAppComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { } }

bootstrap: [], entryComponents: [MicroAppComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { const MicroAppElement = createCustomElement( MicroAppComponent, { injector: this.injector }); customElements.define('micro-app', MicroAppElement); } }

@ManfredSteyer Loading MicroApps <script src="micro-app.bundle.js"></script> <micro-app></micro-app>

@ManfredSteyer 4) DEMO

@ManfredSteyer 5) Recipes

@ManfredSteyer Communication

@ManfredSteyer Communication between Micro Apps <client-a state="appState" message="handle(event)"></client-a> <client-b state="appState"
message="handle(event)"></client-b> JavaScript in Shell

@ManfredSteyer Routing

@ManfredSteyer Routing /client-a/this/that /client-b/this/that /client-c/this/that :

@ManfredSteyer Lazy Loading

@ManfredSteyer Lazy Loading const content = document.getElementById('content');

@ManfredSteyer Lazy Loading const content = document.getElementById('content'); // Add script-Tag
const script = document.createElement('script'); script.src = [...]; content.appendChild(script);

@ManfredSteyer Lazy Loading const content = document.getElementById('content'); // Add script-Tag
const script = document.createElement('script'); script.src = [...]; content.appendChild(script); // Add Element const element: HTMLElement = document.createElement('client-a'); element.addEventListener('message', (event) => [...]); element.setAttribute('appState', [...]); content.appendChild(element);

@ManfredSteyer Bundling

@ManfredSteyer Bundles Custom Element 1 Custom Element 2 Custom Element
3 Libraries: Angular, Bootstrap, … Libraries: Angular, Bootstrap, …

@ManfredSteyer Tree Shaking + ngIvy (Angular 7?) Custom Element 1
Custom Element 2 Custom Element 3

@ManfredSteyer Sharing Libs Custom Element 1 Custom Element 2 Custom
Element 3 Libraries: Angular, Bootstrap, … UMD ngx-build-plus Drawbacks: Complexity, no isolation

@ManfredSteyer Conclusion Separate Deployment Less Coordination Mixing Technologies Shadow DOM
& Angular Elements Macro vs. Macro Level

@ManfredSteyer Blog > SOFTWAREarchitekt.at • A Software Architect's Approach Towards
Using Angular (And SPAs In General) For Microservices Aka Microfrontends • Micro Apps With Web Components Using Angular Elements • Angular Elements: A dynamic Dashboard … • Angular, React, Vue.Js And Co. Peacefully United Thanks To Micro Apps And Web Components

@ManfredSteyer Contact and Downloads [mail] [email protected] [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer
d http://www.softwarearchitekt.at Slides & Examples

Micro-Apps and Angular Elements -- Talk from ng...

Micro-Apps and Angular Elements -- Talk from ngGraz, Sep. 2018

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