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Labs

Guided: Create Interactive Svelte Components with Advanced Features

Elevate your Svelte skills by building a dynamic feedback application from the ground up. In this lab, you will move beyond the basics to master advanced features such as Svelte Runes for reactive state management, custom events for clean component communication, and built-in transitions for a polished user experience. You'll leave with a tangible project and the confidence to build sophisticated, interactive web applications with Svelte 5.

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Path Info

Level
Clock icon Beginner
Duration
Clock icon 40m
Last updated
Clock icon Sep 15, 2025

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Table of Contents

  1. Challenge

    Step 1: Introduction and Setup

    Welcome to the Svelte Advanced Features lab! In this lab, you'll build a Feedback Hub, an interactive application where users can submit ratings and comments.

    The Application

    You will implement:

    • A form to submit new feedback.
    • A dynamic list that displays all submitted feedback.
    • Global state management using modern Svelte Runes.
    • Smooth animations for a polished user experience.

    File Structure

    The initial project contains a basic SvelteKit structure. You will primarily work in these files:

    • src/App.svelte: The main app component.
    • src/app.css: The global stylesheet.
    • src/lib/components/: Directory for your FeedbackForm and FeedbackList components.
    • src/lib/store.svelte: File for creating the shared state.

    Running the Application

    In the Terminal tab, start the development server by running the following command:

    npm run dev

    This will start the application, and you can view your progress in the Web Browser.

  2. Challenge

    Step 2: Apply Global Styles and Metadata

    A great application starts with a consistent look and feel. You'll begin by setting up global styles and importing a custom font for your app.

    In Svelte, the src/App.svelte file is the main component. This is the perfect place to include elements that appear on every page, such as metadata in the document <head>. You'll use the special <svelte:head> element to inject a <link> tag for a Google Font. Next, you'll add some basic styling in src/app.css. SvelteKit automatically includes this stylesheet globally when it's imported in the root layout, which you just completed. These styles will define the background color, font, and container layout for the app.

  3. Challenge

    Step 3: Manage State with Svelte Runes

    To manage data that needs to be shared across multiple components, you need a state management solution.

    Svelte 5 introduces Runes, a powerful and fine-grained reactivity system.

    You will use the $state rune to create a reactive variable that holds our array of feedback items. When this variable is updated from any component, every component that uses it will automatically re-render. This is much simpler than traditional Svelte stores.

    Now it's time to create a dedicated file for your shared state.

  4. Challenge

    Step 4: Build the Feedback Form Component

    Build the component for submitting new feedback. This component will have its own internal state to manage the form inputs before submission.

    You'll start by creating the form's HTML structure and defining its local state using the $state rune again. Svelte's $bind rune provides a simple and elegant way to create a two-way data binding. When the user types in the input, the variable updates. If the variable changes programmatically, the input value updates.

    To make the form interactive, link the state variables (rating and comment) to the HTML input elements with $bind. To make the form interactive, we need to link our state variables (rating and comment) to the HTML input elements. Svelte's $bind rune provides a simple and elegant way to create a two-way data binding. When the user types in the input, the variable updates, and if the variable changes programmatically, the input's value updates.

  5. Challenge

    Step 5: Implement Custom Event Handling

    The FeedbackForm component needs a way to send its data to a parent component. Instead of passing down callback functions, a cleaner pattern is for the child component to dispatch a custom event. The parent can then listen for this event.

    You'll create a handleSubmit function to manage the form submission process. In Svelte 5, you can get a dispatch function from the special $props() rune. This function allows you to send named events with a data payload.

    Inside the handleSubmit function, after preventing the default behavior, you'll dispatch the custom event.

  6. Challenge

    Step 6: Create a Dynamic and Animated Feedback List

    Now you'll build the component that displays the feedback. This component will read data directly from the global feedbackItems store you created earlier.

    You'll use Svelte's {#each} block to dynamically render a list of elements from an array. This is the core of rendering dynamic data in Svelte. To make the UI feel more alive, you can easily add animations using Svelte's built-in transitions. The transition directive allows elements to animate in and out of the DOM.

    You'll import the fade transition and apply it to the list items. You also need to provide a unique key to the {#each} block so Svelte can correctly track which items are being added or removed.

  7. Challenge

    Step 7: Wire Everything Together

    The final step is to bring all the pieces together in the App component, src/routes/App.svelte. This component acts as the orchestrator. It will:

    1. Render the FeedbackForm and FeedbackList.
    2. Listen for the addfeedback event from the form.
    3. Update the global feedbackItems state, which will cause the FeedbackList to automatically update.

    First, set up the script to handle the incoming event and update the store. Now, update the markup to render the components and connect the event listener. Have the <FeedbackForm> component call the handler function whenever it dispatches the addfeedback event.

Tom Bell - Labs - Tom
Author
Tom Bell

Tom is a staff author at Pluralsight helping to develop Hands-On content. Tom's background in software development, UI/UX, and instructional design was developed over the years while working as a faculty member at the School of Computing at Weber State University in Utah, and continues to grow as he develops Projects and Labs for Pluralsight. When he's not creating content to allow learners to gain real-life experience, he enjoys spending time with his family.

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