Sustainable Web Frontends with Angular Elements and Micro Apps

Transcript

1. @ManfredSteyer Sustainable Web Frontends with Angular Elements and Micro Apps Manfred Steyer SOFTWAREarchitekt.at ManfredSteyer
2. @ManfredSteyer ✓ Commodore 64 ✓ 1982 ✓ ~ 1 MHz ✓ 64 KB RAM ✓ Disks with 170 KB
3. @ManfredSteyer Version with two cores ;-) Challenge: Resources!
4. @ManfredSteyer Challenges today: Complexity
5. @ManfredSteyer Coordination b/w teams
6. @ManfredSteyer Long Time Maintain- ability Maintain + Extend for 10 - 20 yrs
7. @ManfredSteyer There are milk products lasting longer than some JavaScript frameworks
8. @ManfredSteyer Contents 1) Web Components 2) Micro Apps 3) Recipes 4) Evaluierung
9. @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
10. @ManfredSteyer 1) Web Components
11. @ManfredSteyer Framework independent Components
12. @ManfredSteyer Can be dynamically loaded into the browser!
13. @ManfredSteyer Umbrella Term for several Standards
14. @ManfredSteyer Standards Templates HTML Imports Custom Elements Shadow DOM
15. @ManfredSteyer Can be pollyfilled down to IE11
16. @ManfredSteyer API class CustomerSelector extends HTMLElement { […] }
17. @ManfredSteyer API class CustomerSelector extends HTMLElement { constructor() { super(); this.attachShadow({mode: 'open'}); this.shadowRoot.innerHTML = '<div>[…]</div>'; } […] }
18. @ManfredSteyer API class CustomerSelector extends HTMLElement { constructor() { super(); this.attachShadow({mode: 'open'}); this.shadowRoot.innerHTML = '<div>[…]</div>'; } […] } customElements.define('customer-selector', CustomerSelector);
19. @ManfredSteyer API <script src="customer-selector.min.js"></script> […] <customer-selector></customer-selector>
20. @ManfredSteyer Angular Elements
21. @ManfredSteyer Angular Elements @NgModule({ imports: [BrowserModule], declarations: [DateComponent], bootstrap: [], entryComponents: [DateComponent] }) export class AppModule { }
22. @ManfredSteyer Angular Elements @NgModule({ imports: [BrowserModule], declarations: [DateComponent], bootstrap: [], entryComponents: [DateComponent] }) export class AppModule { }
23. @ManfredSteyer Angular Elements @NgModule({ imports: [BrowserModule], declarations: [DateComponent], bootstrap: [], entryComponents: [DateComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { } }
24. @ManfredSteyer Angular Elements @NgModule({ imports: [BrowserModule], declarations: [DateComponent], bootstrap: [], entryComponents: [DateComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { const DateElement = createCustomElement( DateComponent, { injector: this.injector }); customElements.define('date-picker', DateElement); } }
25. @ManfredSteyer Loading MicroApps <script src="date-element.bundle.js"></script> <micro-app></micro-app>
26. @ManfredSteyer 2) Micro Apps
27. @ManfredSteyer Idea System Team A Team B Framework Architecture Maintainability? Hard to change!
28. @ManfredSteyer Idea µService µService µService
29. @ManfredSteyer Idea µApp µApp µApp
30. @ManfredSteyer Folie▪ 31 Pro Contra
31. @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
32. @ManfredSteyer UI Composition w/ Hyperlinks µApp SPA µApp SPA µApp SPA <a href="…>…</a> <a href="…>…</a>
33. @ManfredSteyer ✓ Simple  Loosing State  Load a new Application  Consistent Look and Feel
34. @ManfredSteyer
35. @ManfredSteyer Web Components for Shared Widgets?
36. @ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp Shell ▪ iframes ▪ Bootstrapping several SPAs ▪ Consider Lazy Loading!
37. @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?
38. @ManfredSteyer 3) DEMO
39. @ManfredSteyer µService µApp3 µApp2 µApp1 Shell Web Components for Shell-Architecture Shared Widget Shared Widget Shared Widget Web Components for shared Widgets
40. @ManfredSteyer 3) Recipes
41. @ManfredSteyer Communication
42. @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
43. @ManfredSteyer Routing
44. @ManfredSteyer Routing /client-a/this/that /client-b/this/that /client-c/this/that :
45. @ManfredSteyer Routing /client-a/this/that /client-b/this/that /client-c/this/that :
46. @ManfredSteyer Lazy Loading
47. @ManfredSteyer Lazy Loading const content = document.getElementById('content');
48. @ManfredSteyer Lazy Loading const content = document.getElementById('content'); // Add script-Tag const script = document.createElement('script'); script.src = [...]; content.appendChild(script);
49. @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);
50. @ManfredSteyer Bundling
51. @ManfredSteyer Bundles Custom Element 1 Custom Element 2 Custom Element 3 Libraries: Angular, Bootstrap, … Libraries: Angular, Bootstrap, …
52. @ManfredSteyer Tree Shaking + Ivy (Angular 8) Custom Element 1 Custom Element 2 Custom Element 3
53. @ManfredSteyer Sharing Libs Custom Element 1 Custom Element 2 Custom Element 3 Libraries: Angular, Bootstrap, … UMD ngx-build-plus Drawbacks: Complexity, no isolation
54. @ManfredSteyer 4) Choosing a Solution
55. @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?
56. @ManfredSteyer Shared Widgets Packages (e. g. w/ Web Components) Lazy Loaded Web Components Inner Sourcing Seperate Ways …
57. @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
58. @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
59. @ManfredSteyer Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer d Slides & Examples http://softwarearchitekt.at/workshops