book

Real-World Svelte

Name: Real-World Svelte
Author: Tan Li Hau
ISBN: 9781804616031

by Tan Li Hau

December 2023

Intermediate to advanced

282 pages

6h 25m

English

Packt Publishing

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Real-World Svelte
ForewordContributorsAbout the authorAbout the reviewer
Preface
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesConventions usedGet in touchShare Your ThoughtsDownload a free PDF copy of this book
Part 1: Writing Svelte Components
Chapter 1: Lifecycles in Svelte
Technical requirementsUnderstanding the Svelte lifecycle functionsInitializing the componentMounting the componentUpdating the componentDestroying the componentThe one rule for calling lifecycle functionsRefactoring lifecycle functionsWhich component to register?Reusing lifecycle functions in Svelte componentsExercise 1 – Update counterComposing lifecycle functions into reusable hooksCoordinating lifecycle functions across componentsExercise 2 – Scroll blockerSummary
Chapter 2: Implementing Styling and Theming
Technical requirementsStyling Svelte components in six different waysStyling with the style attributeUsing style: directivesAdding the <style> blockAdding the class attributeSimplifying the class attribute with the class: directiveApplying styles from external CSS filesChoosing which method to style Svelte componentsStyling Svelte with Tailwind CSSSetting up Tailwind CSSTheming Svelte components with CSS custom propertiesDefining CSS custom propertiesExample – implementing a dark/light theme modeAllowing users to change the styles of a componentAligning the fallback valueSummary
Chapter 3: Managing Props and State
Technical requirementsDefining props and stateDefining propsDefining stateProps versus stateUnderstanding bindingsOne-way versus two-way data flowDeriving states from props with a reactive declarationManaging complex derived statesUpdating props using derived statesSummary
Chapter 4: Composing Components
Technical requirementsManipulating how a child component looksPassing dynamic content through slotsProviding default slot contentHaving multiple slots with named slotsPassing data through slot propsRendering different HTML element or component typesCreating recursive components for recursive dataExample – a JSON tree viewerThe Container/Presentational patternSummary
Part 2: Actions
Chapter 5: Custom Events with Actions
Technical requirementsDefining actionsReusing DOM event logic with custom eventsEncapsulating logic into a componentEncapsulating logic into an actionPassing parameters to an actionExample – validating form inputs with custom eventsExercise – creating a drag-and-drop eventSummary
Chapter 6: Integrating Libraries with Actions
Technical requirementsIntegrating vanilla JavaScript UI libraries into SvelteWhy use Svelte actions to integrate a UI library?Using Svelte actionsAdding data to Svelte actionsAn alternative to Svelte actionsChoosing between Svelte actions and Svelte componentsExample – integrating Tippy.jsExample – integrating CodeMirrorUsing UI libraries written in other frameworksCreating components in various frameworksCleaning up the components in various frameworksUpdating the component in various frameworksIntegrating react-calendar into SvelteSummary

Chapter 7: Progressive Enhancement with Actions
Technical requirementsWhat is progressive enhancement?Progressively enhancing the web experienceBuilding web pages in layersSvelte actions for progressive enhancementsExample – previewing a link with a <a> elementExample – progressively enhancing a formThe default form behaviorImplementing the enhance actionSummary
Part 3: Context and Stores
Chapter 8: Context versus Stores
Defining Svelte contextUsing an object as a context keyChanging the context valueDefining the Svelte storeUsing the observer patternDefining the subscribe functionDefining a Svelte storeCreating Svelte stores with built-in functionsAuto-subscribing to a Svelte storeChoosing between a Svelte context and a Svelte storePassing dynamic context using a Svelte storeSummary
Chapter 9: Implementing Custom Stores
Technical requirementsCreating a Svelte store from user eventsEnsuring the event listener is only added onceExerciseCreating an undo/redo storeImplementing the undo/redo logicExerciseCreating a debounced higher-order Svelte storeDebouncing store value changesSubscribing and unsubscribing original store on demandDeriving a new Svelte store with the derived() functionUsing the derived methodExerciseSummary
Chapter 10: State Management with Svelte Stores
Technical requirementsManaging states with Svelte storesTip 1 – simplify complex state updates with unidirectional data flowTip 2 – prefer smaller self-contained state objects over one big state objectTip 3 – derive a smaller state object from a bigger state objectUsing state management libraries with SvelteExample – using Valtio as a Svelte storeExercise – transforming an XState state machine into a Svelte storeSummary
Chapter 11: Renderless Components
Technical requirementsWhat are renderless components?Exploring reusable renderless componentsExample – building a renderless carousel componentWriting a renderless carousel componentExercise 1 – a renderless autocomplete componentTurning a declarative description into imperative instructionsWriting declarative Canvas componentsExercise 2 – expanding shape componentsSummary
Chapter 12: Stores and Animations
Technical requirementsIntroducing the tweened and spring storesUsing the tweened and spring storesUsing tweened and spring stores with arrays and objectsExamples – creating an animated graph with the tweened and spring storesExercise – creating an animating line graphCreating custom tweened interpolatorsExamples – creating an animated image previewSummary
Part 4: Transitions
Chapter 13: Using Transitions
Technical requirementsAdding transitions to elementsSvelte’s built-in transitionsCustomizing a transitionWhen are the transitions played?Handling mixed transition and static elementsOther Svelte logical blocks for transitionsThe global modifierHow Svelte transition works under the hoodCreating animations with CSSCreating animations with JavaScriptAnimating transitions in SvelteSummary
Chapter 14: Exploring Custom Transitions
Technical requirementsThe transition contractThe css functionThe tick functionWriting a custom CSS transition using the css functionWriting a custom JavaScript transition using the tick functionSummary
Chapter 15: Accessibility with Transitions
Technical requirementsWhat is web accessibility?Understanding user preference with prefers-reduced-motionReducing motion for Svelte transitionHaving alternative transitions for inaccessible usersSummary
Index
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Content preview from Real-World Svelte

5 Custom Events with Actions

Actions are one of the most powerful features of Svelte.

They are a lightweight alternative to a component that encapsulates logic and data into a reusable unit. They help us reuse the same logic on different elements.

While components have life cycle methods such as onMount and onDestroy that run when all the elements within the component are added to or removed from the DOM, actions are designed to handle the logic for individual elements, running only when that specific element is added to or removed from the DOM.

While components can receive and react to prop changes, you can pass data to actions from a parent component to a child component. The actions will react when the data is changed and you can specify ...

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ISBN: 9781804616031

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Real-World Svelte

by Tan Li Hau

5

Custom Events with Actions

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.