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SvelteKit Tutorial - 37 - Preload Data

3 min read 7 months ago
Published on Aug 06, 2024 This response is partially generated with the help of AI. It may contain inaccuracies.

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Introduction

This tutorial will guide you through the process of preloading data in SvelteKit using attributes to enhance the performance of your web application. By preloading data, you can improve user experience by reducing load times when navigating between pages.

Step 1: Set Up Preloading on a Link

  1. Open your SvelteKit project and navigate to the root page file.
  2. Locate the link to the products page. Add the following attribute to the link:
    data-sveltekit-preload-data="hover"
  3. This setting will start preloading data when a user hovers over the link, allowing for quicker loading once the link is clicked.

Step 2: Test Preloading in the Browser

  1. Open the browser and refresh the homepage.
  2. With the Network tab open, hover over the products link.
  3. Observe that data and code requests are sent to the server before you click the link.
  4. Click the link, and notice how the page loads almost instantly due to the preloaded data.

Step 3: Explore Different Preloading Values

  • Hover: Initiates preloading when the mouse hovers over the link.
  • Tap: Initiates preloading only when the user taps or clicks the link. To set this, change the attribute to:
    data-sveltekit-preload-data="tap"

Testing Tap Value

  1. Refresh the homepage.
  2. Hover over the products link; there should be no preloading.
  3. Click and hold the mouse button on the link to see that preloading begins.

Step 4: Apply Preloading to Multiple Links

  1. To apply the preload attribute to multiple links, add it to the <body> tag in app.html:
    <body data-sveltekit-preload-data="hover">
  2. This will ensure that all links within the body respect this preload setting.

Testing Body-Level Preloading

  1. Refresh the browser.
  2. Hover over an individual product link to confirm that preloading still works.

Step 5: Customize Preloading for Specific Links

  1. If you want a specific link to not preload, you can set its preload attribute to off:
    data-sveltekit-preload-data="off"
  2. Apply this to the products link in the homepage to prevent preloading for just that link.

Testing Custom Preloading Settings

  1. Refresh the homepage.
  2. Hover over the products link and confirm that there is no preloading.
  3. Check that preloading still functions on other product links.

Conclusion

Preloading data in SvelteKit can significantly enhance the performance of your web application, making transitions smoother for users. By using the data-sveltekit-preload-data attribute, you can control when and how data is fetched. Experiment with different preload settings to find the best configuration for your site. As you continue to optimize, consider exploring additional attributes in SvelteKit for further enhancements.

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