How to update the page and query parameters in SvelteKit?

Updating pages and query parameters in SvelteKit can be achieved primarily by using the goto function from the $app/navigation module. This function enables navigation to different routes within the application while modifying the query parameters in the URL.

Basic Usage

Updating Pages

To navigate to another page on the same website, use the goto function as follows:

javascript
import { goto } from '$app/navigation';

// Navigate to another page on the website
goto('/another-page');

This causes the browser to load the new page and display the corresponding content.

Updating Query Parameters

To change the current URL's query parameters while remaining on the same page, do the following:

javascript
import { goto } from '$app/navigation';

// Update query parameters
goto('?newParam=value');

This updates the URL's query parameters without reloading the entire page. This feature is particularly useful for implementing features like search filtering, where users can observe changes in query parameters and the page content updates dynamically.

Advanced Usage

In scenarios where you need to construct complex URLs based on application state or user interactions—such as updating a product list based on selected filters—you can do the following:

javascript
import { goto } from '$app/navigation';

function updateFilters(filters) {
  const searchParams = new URLSearchParams();

  for (let key in filters) {
    if (filters[key]) {
      searchParams.append(key, filters[key]);
    }
  }

  goto(`?${searchParams}`);
}

Here, filters is an object containing user-selected filter conditions. We use URLSearchParams to build the query string and update the page and query parameters via the goto function.

Important Notes

• When using the goto function, ensure you handle relative paths or complete URLs to avoid navigation errors.
• If updating query parameters and you do not want the page to scroll to the top, include the additional parameter { noscroll: true } in the goto function call.

With the above examples, you can effectively update pages and query parameters in SvelteKit. This is a valuable feature for enhancing user experience and application interactivity.