Table Of Content

Fullstack Web Components The Complete Guide to Building UI Libraries and Web Applications with Web Components Written by Steve Belovarich Edited by Nate Murray © 2020 Fullstack.io All rights reserved. No portion of the book manuscript may be reproduced, stored in a retrieval system, or transmitted in any form or by any means beyond the number of purchased copies, except for a single backup or archival copy. The code may be used freely in your projects, commercial or otherwise. The authors and publisher have taken care in preparation of this book, but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequential damagers in connection with or arising out of the use of the information or programs container herein. Published by \newline Contents BookRevision . . . . . . . . . . . . . . . . . . . . . . . . . 1 JoinOurDiscord . . . . . . . . . . . . . . . . . . . . . . . 1 BugReports . . . . . . . . . . . . . . . . . . . . . . . . . . 1 BenotifiedofupdatesviaTwitter . . . . . . . . . . . . . 1 We’dlovetohearfromyou!. . . . . . . . . . . . . . . . . 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Abouttheauthor . . . . . . . . . . . . . . . . . . . . . . . 3 WebComponents. . . . . . . . . . . . . . . . . . . . . . . 4 Aboutthisbook . . . . . . . . . . . . . . . . . . . . . . . . 5 Whoisthisbookfor . . . . . . . . . . . . . . . . . . . . . 5 IntroductiontoWebComponents . . . . . . . . . . . . . 6 WhatareWebComponents? . . . . . . . . . . . . . . . . 11 ThemanyusesofWebComponents . . . . . . . . . . . . 17 ImplementingadesignsystemwithWebComponents . 19 ConventionsusedinthisBook . . . . . . . . . . . . . . . 20 Storybook . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Application . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Cypress . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Storyshots . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Monorepo . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Settingupthedevelopmentenvironment . . . . . . . . . 25 Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . 25 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 CONTENTS PartOne . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 PartOne . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Specification . . . . . . . . . . . . . . . . . . . . . . . . . 32 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 33 DevelopinginPartOne . . . . . . . . . . . . . . . . . . . 34 GettingtoKnowWebComponents. . . . . . . . . . . . . . 35 ChapterOne. . . . . . . . . . . . . . . . . . . . . . . . . . 35 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 35 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 38 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 38 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 39 ScaffoldingCardComponent . . . . . . . . . . . . . . . . 39 Structurecontentwithtemplateslots . . . . . . . . . . . 45 Createcontrolsforthestory . . . . . . . . . . . . . . . . 49 Styling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Testingthecard . . . . . . . . . . . . . . . . . . . . . . . . 60 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Form-associatedcustomelements . . . . . . . . . . . . . . 74 ChapterTwo . . . . . . . . . . . . . . . . . . . . . . . . . 74 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 76 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 79 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 79 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 80 ScaffoldingTextInputComponent . . . . . . . . . . . . . 80 Structurethecontent . . . . . . . . . . . . . . . . . . . . . 82 Definethestory. . . . . . . . . . . . . . . . . . . . . . . . 84 FormAssociatedandElementInternals . . . . . . . . . . 86 HandlingValidation . . . . . . . . . . . . . . . . . . . . . 89 Listeningforattributechanges . . . . . . . . . . . . . . . 98 Userfeedback . . . . . . . . . . . . . . . . . . . . . . . . . 112 HandlingDisabledState . . . . . . . . . . . . . . . . . . . 115 CONTENTS Makestories . . . . . . . . . . . . . . . . . . . . . . . . . . 116 StylingwithCSSvariables . . . . . . . . . . . . . . . . . 119 EmulatingHTMLInputElement . . . . . . . . . . . . . . . 123 Makingaform . . . . . . . . . . . . . . . . . . . . . . . . 129 HandlingFormData . . . . . . . . . . . . . . . . . . . . . 137 TestingTextInputComponent . . . . . . . . . . . . . . . . 139 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Customizedbuilt-inelements . . . . . . . . . . . . . . . . . 146 ChapterThree. . . . . . . . . . . . . . . . . . . . . . . . . 146 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 149 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 150 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 151 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 151 ScaffoldingButtonComponent . . . . . . . . . . . . . . . 151 StylingButtonComponent . . . . . . . . . . . . . . . . . . 155 Makingtheformaccessible . . . . . . . . . . . . . . . . . 167 TestingButtonComponent . . . . . . . . . . . . . . . . . 179 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 PartTwo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 PartTwo . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 UILibrary . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 184 DevelopinginPartTwo . . . . . . . . . . . . . . . . . . . 184 Micro-library . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 ChapterFour . . . . . . . . . . . . . . . . . . . . . . . . . 186 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Whatisamicro-library? . . . . . . . . . . . . . . . . . . . 190 Codinginamonorepo . . . . . . . . . . . . . . . . . . . . 190 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 192 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 192 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 192 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 193 CONTENTS ClassDecorator . . . . . . . . . . . . . . . . . . . . . . . . 193 MethodDecorator . . . . . . . . . . . . . . . . . . . . . . 227 DefinetheListendecorator . . . . . . . . . . . . . . . . . 231 RefactorTextInputComponent . . . . . . . . . . . . . . . 238 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 CompoundCustomElements . . . . . . . . . . . . . . . . . 243 ChapterFive. . . . . . . . . . . . . . . . . . . . . . . . . . 243 ComponentCommunication . . . . . . . . . . . . . . . . 243 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 247 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 247 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 247 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 248 MockingTableDatainStorybook . . . . . . . . . . . . . 248 CodingCompoundComponents . . . . . . . . . . . . . . 260 AttributeDrilling . . . . . . . . . . . . . . . . . . . . . . . 260 BroadcastChannel . . . . . . . . . . . . . . . . . . . . . . 264 RenderingColumnsandRows . . . . . . . . . . . . . . . 266 StylingTableComponent . . . . . . . . . . . . . . . . . . 272 HandlingCRUDEventswithBroadcastChannel . . . . . 275 MakingtheTableEditable . . . . . . . . . . . . . . . . . . 280 TestingtheTable . . . . . . . . . . . . . . . . . . . . . . . 313 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 PoweringDialogswithHTMLTemplates . . . . . . . . . . 324 ChapterSix . . . . . . . . . . . . . . . . . . . . . . . . . . 324 HTMLTemplates . . . . . . . . . . . . . . . . . . . . . . . 324 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 328 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 328 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 328 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 329 MockingtheDialoginStorybook . . . . . . . . . . . . . 329 DialogComponent . . . . . . . . . . . . . . . . . . . . . . 337 ModalandTooltip . . . . . . . . . . . . . . . . . . . . . . 343 QueryingDOMAcrossShadowBoundaries . . . . . . . 350 CONTENTS DialogStack . . . . . . . . . . . . . . . . . . . . . . . . . . 362 TestingDialogs . . . . . . . . . . . . . . . . . . . . . . . . 372 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 DistributingCustomElementLibraries . . . . . . . . . . . 380 ChapterSeven. . . . . . . . . . . . . . . . . . . . . . . . . 380 UILibraries . . . . . . . . . . . . . . . . . . . . . . . . . . 380 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 384 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 384 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 385 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 385 DistributingCustomElementUILibraries . . . . . . . . 386 ProvidingDocumentationwithCustomElementsMani- festandStorybook . . . . . . . . . . . . . . . . . . 398 SetupContinuousIntegrationwithGithubActions . . . 412 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 423 PartThree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425 PartThree . . . . . . . . . . . . . . . . . . . . . . . . . . . 425 Application . . . . . . . . . . . . . . . . . . . . . . . . . . 425 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 425 DevelopinginPartThree . . . . . . . . . . . . . . . . . . 426 ApplicationDevelopmentwithCustomElements . . . . . 428 ChapterEight . . . . . . . . . . . . . . . . . . . . . . . . . 428 ApplicationDevelopmentwithCustomElements . . . . 428 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 430 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 431 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 431 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 432 LandingPage . . . . . . . . . . . . . . . . . . . . . . . . . 432 AppHeader . . . . . . . . . . . . . . . . . . . . . . . . . . 436 CookieFooter . . . . . . . . . . . . . . . . . . . . . . . . . 447 LandingPageContent . . . . . . . . . . . . . . . . . . . . 460 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 467 CONTENTS RoutingCustomElementsinaSPA . . . . . . . . . . . . . . 469 ChapterNine . . . . . . . . . . . . . . . . . . . . . . . . . 469 RoutingCustomElementsinaSPA . . . . . . . . . . . . 469 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 472 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 472 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 472 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 472 Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473 LoginView . . . . . . . . . . . . . . . . . . . . . . . . . . 483 DashboardView . . . . . . . . . . . . . . . . . . . . . . . 498 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 506 Server-sideRenderingwithDeclarativeShadowDOM . . 508 ChapterTen . . . . . . . . . . . . . . . . . . . . . . . . . . 508 Server-SideRenderingCustomElements . . . . . . . . . 508 Whatyouwillbuild . . . . . . . . . . . . . . . . . . . . . 516 Whatyouwilllearn . . . . . . . . . . . . . . . . . . . . . 517 Acceptancecriteria . . . . . . . . . . . . . . . . . . . . . . 517 Gettingstarted . . . . . . . . . . . . . . . . . . . . . . . . 517 DeclarativeShadowDOMTemplates . . . . . . . . . . . 517 Shim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 532 Ponyfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . 536 ExpressMiddleware . . . . . . . . . . . . . . . . . . . . . 537 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 551 FullstackWebComponents . . . . . . . . . . . . . . . . . . 553 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 553 Specification . . . . . . . . . . . . . . . . . . . . . . . . . 554 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556 Thefutureisbright . . . . . . . . . . . . . . . . . . . . . . 558 Changelog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560 Revision1(04-04-2022). . . . . . . . . . . . . . . . . . . . 560 Revision2(12-06-2022). . . . . . . . . . . . . . . . . . . . 560 CONTENTS 1 Book Revision Revision1-Initialpre-releaseofthebook-04-04-2022 Revision2-Changebookcover-12-06-2022 Join Our Discord Come chat with other readers of the book in the official newline Discordchannel: Joinhere:https://newline.co/discord/webcomponents¹ Bug Reports Ifyou’dliketoreportanybugs,typos,orsuggestionsjustemailus at:[email protected]. Be notified of updates via Twitter Ifyou’dliketobenotifiedofupdatestothebookonTwitter,follow usat@fullstackio². We’d love to hear from you! Did you like the book? Did you find it helpful? We’d love to add your face to our list of testimonials on the website! Email us at: [email protected]³. ¹https://newline.co/discord/webcomponents ²https://twitter.com/fullstackio ³mailto:[email protected] Introduction Acknowledgements FormywifeSusanne. Foreword This is a book about Web Components. UI components are a commonpatterninmanyfrontendwebdevelopmentframeworks likeAngular,ReactorVue,butcodinguserinterfacesinthecontext of a framework usually makes sharing those components difficult. Angularcomponentscan’tbeeasilyloadedinthecontextofReact, forinstance.Theframeworkisaclosedsystem. If you can move past the framework, and possibly enjoy the simplification and standardization offered by web specifications, coding with Web Components can be quite rewarding. Working directly with specifications opens up a world once obscured by the framework. The web platform is yours to explore and find interestingwaystoutilizepartsofHTML,CSS,andJavaScript.By using web specifications to code UI components you can achieve extraordinaryresults.Whenusedresponsibly,adoptingWebCom- ponents as your UI component pattern can lead to stellar perfor- mance,compliancewithaccessibilitystandards,andreusability. Atenterprisecorporationsitcanberathercostlytosupportseveral development teams. One way to reduce operational overhead is to standardize UI components and reuse them across a software product. This cuts down on teams “reinventing the wheel”. I’ve witnessed teams struggle with user interface development at sev- eral companies. It can be quite difficult to coordinate the use

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by Steve Belovarich, Nate Murray (ed.)

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Author:	Steve Belovarich; Nate Murray (ed.)
Publication Year:	2020
ISBN:	3432592
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