Sustainable Web Frontends with Angular Elements and Micro Apps

@ManfredSteyer Sustainable Web Frontends with Angular Elements and Micro Apps
Manfred Steyer SOFTWAREarchitekt.at ManfredSteyer

@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 Coordination b/w teams

@ManfredSteyer Long Time Maintain- ability Maintain + Extend for 10
- 20 yrs

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

@ManfredSteyer Contents 1) Web Components 2) Micro Apps 3) Recipes
4) Evaluierung

@ManfredSteyer About me… • Manfred Steyer • SOFTWAREarchitekt.at • Angular
Trainings and Consultancy • Google Developer Expert (GDE) Page ▪ 10 Manfred Steyer Public: Frankfurt, Stuttgart, Wien In-House: everywhere http://softwarearchitekt.at/workshops

@ManfredSteyer 1) 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 Can be pollyfilled down to IE11

@ManfredSteyer API class CustomerSelector extends HTMLElement { […] }

@ManfredSteyer API class CustomerSelector extends HTMLElement { constructor() { super();
this.attachShadow({mode: 'open'}); this.shadowRoot.innerHTML = '<div>[…]</div>'; } […] }

@ManfredSteyer API class CustomerSelector extends HTMLElement { constructor() { super();
this.attachShadow({mode: 'open'}); this.shadowRoot.innerHTML = '<div>[…]</div>'; } […] } customElements.define('customer-selector', CustomerSelector);

@ManfredSteyer API <script src="customer-selector.min.js"></script> […] <customer-selector></customer-selector>

@ManfredSteyer Angular Elements

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

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

entryComponents: [DateComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { const DateElement = createCustomElement( DateComponent, { injector: this.injector }); customElements.define('date-picker', DateElement); } }

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

@ManfredSteyer 2) Micro Apps

@ManfredSteyer Idea System Team A Team B Framework Architecture Maintainability?
Hard to change!

@ManfredSteyer Idea µService µService µService

@ManfredSteyer Idea µApp µApp µApp

@ManfredSteyer Folie▪ 31 Pro Contra

@ManfredSteyer Deployment Monolith µService µService µService Client Fragment Client Fragment
Client Fragment ✓ Easy (Tooling) ✓ One optimized Bundle ✓ Consistent  No separate deployment  Mixing Technologies: Difficult Packages, Monorepo

@ManfredSteyer UI Composition w/ Hyperlinks µApp SPA µApp SPA µApp
SPA <a href="…>…</a> <a href="…>…</a>

@ManfredSteyer ✓ Simple  Loosing State  Load a new
Application  Consistent Look and Feel

@ManfredSteyer

@ManfredSteyer Web Components for Shared Widgets?

@ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp
Shell ▪ iframes ▪ Bootstrapping several SPAs ▪ Consider Lazy Loading!

@ManfredSteyer Common Interface for µApps • Shell should not know
details of µApp and used Frameworks! • µApp provides events • µApp consumes events • Wrap µApp as Web Component?

@ManfredSteyer 3) DEMO

@ManfredSteyer µService µApp3 µApp2 µApp1 Shell Web Components for Shell-Architecture
Shared Widget Shared Widget Shared Widget Web Components for shared Widgets

@ManfredSteyer 3) Recipes

@ManfredSteyer Communication

@ManfredSteyer Communication b/w Web Components <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 + Ivy (Angular 8) 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 4) Choosing a Solution

@ManfredSteyer Some General Advice Shared state, navigation b/w apps Hyperlinks
Legacy Apps or *very very* strong isolation? iframes Separate Deployment/ mix Technologies? Bootstrap several SPAs Monorepo little much yes no yes no Not a good fit for public web sites Wrap as Web Component?

@ManfredSteyer Shared Widgets Packages (e. g. w/ Web Components) Lazy
Loaded Web Components Inner Sourcing Seperate Ways …

@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 Conclusion Web Components: Decoupling from your Framework Micro App:
Decoupling b/w Teams & Projects Web Components + Micro App = ❤️ Best Technology for your current project

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

Sustainable Web Frontends with Angular Elements...

Sustainable Web Frontends with Angular Elements and Micro Apps

More Decks by Manfred Steyer

Other Decks in Programming

Featured

Transcript