Sveltekit - Introduction

SvelteKit is a framework for developers to build web applications with Svelte. It handles common challenges in web development, like routing, data fetching, and server-side rendering. This chapter provides a comprehensive introduction to SvelteKit.

What is a Sveltekit?

SvelteKit is an application framework designed for developers to create production-ready applications. While Svelte focuses on developing individual components, SvelteKit deals with bigger challenges in app development.

Key Features of SvelteKit

SvelteKit efficiently handles common challenges in web application development that are mentioned below:

• Routing: SvelteKit allows you to manage how users navigate between different pages in your application.
• Server-side Rendering (SSR): SvelteKit enables server-side rendering. It renders pages on the server before sending them to the client, improving performance and SEO.
• Data Fetching: SvelteKit provides a simplified way to retrieve data for your application.
• Service Workers: SvelteKit supports offline capabilities and background tasks.
• TypeScript Integration: SvelteKit allows developers to use TypeScript for better type safety.
• Prerendering: It generates static HTML at build time for faster load times.
• Single-page Applications (SPA): SvelteKit can function like a single-page application, where only parts of the page update without a full reload.

How SvelteKit Works?

SvelteKit apps start by rendering on the server for fast loading times and better SEO. Then, they switch to client-side navigation for a smoother user experience without reloading the whole page.

You can begin with basic features and gradually add complexity as needed.

Project Structure

The following are the lists of files and their overview used in svelteKit.

• package.json: Package.json file in svelteKit is used to list project dependencies and scripts for running the app.
• svelte.config.js: Svelte.config.js file Contains configuration settings for your SvelteKit project.
• vite.config.js: It contains configuration for Vite, which helps with development features like hot reloading.
• src: The folder where your application code lives.
• src/routes: This file defines various routes in your application.
• static: It contains static files like images that are served directly.

Example

The following is a simple example of color picker that allows users to select a color and see its hex value created with the help of svelteKit.

<!--App.svelte-->
<script>
    let color = '#ff0000'; // Default color

    function updateColor(event) {
    color = event.target.value;
    }
</script>

<main>
    <h1>Color Picker</h1>
    <input type="color" bind:value={color} on:input={updateColor} />
    <div class="color-display" style="background-color: {color};">
    <p>{color}</p>
    </div>
</main>

<style>
    main {
        max-width: 400px;
        margin: 0 auto;
        text-align: center;
        font-family: Arial, sans-serif;
        padding: 20px;
    }

    h1 {
    color: #333;
    }

    .color-display {
        margin-top: 20px;
        padding: 20px;
        border: 1px solid #ccc;
        border-radius: 4px;
        color: white;
        font-weight: bold;
    }
</style>

Output