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Web Components with Angular Elements: Beyond the Basics @ngconf 2019
Manfred Steyer
PRO
May 01, 2019
Programming
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Web Components with Angular Elements: Beyond the Basics @ngconf 2019
Manfred Steyer
PRO
May 01, 2019
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Transcript
@ManfredSteyer Web Components with Angular Elements: Beyond the Basics Manfred
Steyer SOFTWAREarchitekt.at ManfredSteyer
@ManfredSteyer
@ManfredSteyer [Igor Minar, Angular Connect 2018 Keynote]
@ManfredSteyer
@ManfredSteyer Angular Elements
@ManfredSteyer Custom Elements: Framework independent components
@ManfredSteyer Possibilities Component Libraries Enriching existing Apps CMS Integration Dynamic
Loading
@ManfredSteyer Contents • Basics (just one slide) • Dynamically adding
elements • Lazy loading elements • External elements • Bundle Size
@ManfredSteyer About me … • Manfred Steyer SOFTWAREarchitekt.at • Angular
Trainings and Consultancy • Google Developer Expert (GDE) • Angular Trusted Collaborator Page ▪ 9 Manfred Steyer Public: Vienna, Munich, Frankfurt In-House: Everywhere in Europe http://www.softwarearchitekt.at/workshops
@ManfredSteyer 1) Basics
@ManfredSteyer Angular Elements Wrap Angular Components: createCustomElement(…) Register it with
browser: customElements.define(…)
@ManfredSteyer 2) Dynamic Elements
@ManfredSteyer Adding Custom Elements dynamically const tile = document.createElement('dashboard-tile');
@ManfredSteyer Adding Custom Elements dynamically const tile = document.createElement('dashboard-tile‘); tile['prop']
= 123; tile.setAttribute('class', 'col-lg-4 col-md-3 col-sm-2') tile.addEventListener([…])
@ManfredSteyer Adding Custom Elements dynamically const tile = document.createElement('dashboard-tile'); tile['prop']
= 123; tile.setAttribute('class', 'col-lg-4 col-md-3 col-sm-2') tile.addEventListener([…]) otherElement.appendChild(tile); Angular uses Domino to simulate document for SSR!
@ManfredSteyer DEMO
@ManfredSteyer 3) Lazy Loading
@ManfredSteyer 2 Steps for Lazy Elements Register module in angular.json
Load with with NgModuleFactoryLoader
@ManfredSteyer Register in angular.json "lazyModules": [ "[…]/lazy-dashboard-tile.module" ],
@ManfredSteyer Loading your module @Injectable({ providedIn: 'root' }) export class
LazyDashboardTileService { }
@ManfredSteyer Loading your module @Injectable({ providedIn: 'root' }) export class
LazyDashboardTileService { constructor( private loader: NgModuleFactoryLoader, private injector: Injector ) {} }
@ManfredSteyer Loading your module @Injectable({ providedIn: 'root' }) export class
LazyDashboardTileService { constructor( private loader: NgModuleFactoryLoader, private injector: Injector ) {} load(): Promise<void> { const path = '[…]/lazy-dashboard-tile.module‘; […] } }
@ManfredSteyer Loading your module @Injectable({ providedIn: 'root' }) export class
LazyDashboardTileService { constructor( private loader: NgModuleFactoryLoader, private injector: Injector ) {} load(): Promise<void> { const path = '[…]/lazy-dashboard-tile.module'; return this.loader.load(path).then(moduleFactory => { }); } }
@ManfredSteyer Loading your module @Injectable({ providedIn: 'root' }) export class
LazyDashboardTileService { constructor( private loader: NgModuleFactoryLoader, private injector: Injector ) {} load(): Promise<void> { const path = '[…]/lazy-dashboard-tile.module'; return this.loader.load(path).then(moduleFactory => { moduleFactory.create(this.injector); }); } }
@ManfredSteyer DEMO
@ManfredSteyer 4) External Elements
@ManfredSteyer Project A Custom Element Custom Element Bundle Project B
@ManfredSteyer Create application for Custom Elements Compile application to self
contained bundle Load bundle into consumer 3 Steps
@ManfredSteyer Compile to self-contained bundle
@ManfredSteyer ng add ngx-build-plus
@ManfredSteyer One of the simplest bundle loaders … const script
= document.createElement('script'); script.src = 'assets/external-dashboard-tile.bundle.js'; document.body.appendChild(script);
@ManfredSteyer DEMO
@ManfredSteyer 5) Bundle Size
@ManfredSteyer Bundles Custom Element 1 Custom Element 2 Custom Element
3 Libraries: Angular, RxJS, … Libraries: Angular, RxJS, …
@ManfredSteyer Angular Elements + Ivy Custom Element 1 Custom Element
2 Custom Element 3
@ManfredSteyer Where Ivy can help ✓ UI-based Widgets ✓ Libraries
@ManfredSteyer Sharing Libs Custom Element 1 Custom Element 2 Custom
Element 3 Libraries: Angular, RxJS, … Drawbacks: Complexity, non-default build, …
@ManfredSteyer Summary Reuse with other technologies Dynamically Adding Lazy Loading
External Elements Ivy for UI-based Code Sharing Dependencies
@ManfredSteyer Sometimes, all we want is a greasy pizza!
@ManfredSteyer Blog > SOFTWAREarchitekt.at • Angular Elements, Part I: A
Dynamic Dashboard In Four Steps With Web Components […] • Angular Elements, Part V: Your Options For Building Angular Elements With The CLI
@ManfredSteyer Workshop: Tomorrow A Deep Look at Angular Elements With
live coding and exercises for you on StackBlitz Thu, May 2:30 pm - 4:30 pm
@ManfredSteyer Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer
d http://softwarearchitekt.at/workshops Slides & Examples