Filter using query string is not working in SvelteKit. How to solve this?

If you are facing issues with filtering data using query strings in SvelteKit, you’re not alone. Many developers have encountered this problem and struggled to find a solution. In this blog post, we will explore a couple of approaches to solve this issue.

1. Using the $page.query object

SvelteKit provides a built-in object called $page.query that allows you to access the query string parameters. You can use this object to filter your data based on the provided query string values.

Here’s an example of how you can implement filtering using the query string:

    import { page } from '$app/stores';
    import { onMount } from 'svelte';

    let filteredData = [];

    onMount(() => {
      const { filter } = $page.query;
      
      // Perform filtering logic here based on the 'filter' value
      
      // Example: Filtering an array of data
      filteredData = data.filter(item => item.name.includes(filter));
    });
  

In the above code snippet, we import the page store from $app/stores and use the onMount lifecycle function to perform the filtering logic. We access the filter value from the $page.query object and apply the desired filtering logic.

2. Using the svelte-query library

If you prefer a more structured approach to handling data fetching and filtering, you can utilize the svelte-query library. This library provides a powerful set of tools for managing data in SvelteKit applications.

First, install the library by running the following command:

npm install svelte-query

Next, create a query using the useQuery function from svelte-query. Here’s an example:

    import { useQuery } from 'svelte-query';

    const fetchFilteredData = async (filter) => {
      // Perform API request or data filtering logic here
      
      // Example: Filtering an array of data
      return data.filter(item => item.name.includes(filter));
    };

    const MyComponent = () => {
      const { data: filteredData } = useQuery('filteredData', fetchFilteredData, {
        initialData: [],
      });

      // Render your component using the filteredData
      
      return (
        

          

            {#each filteredData as item}
              
{item.name}
            {/each}
          
        
      );
    };
  

In the above code snippet, we define a function fetchFilteredData that performs the filtering logic. We use the useQuery function to create a query named 'filteredData' and pass the fetchFilteredData function as the query function. The initialData option allows you to provide an initial value for the filtered data.

Inside the MyComponent component, we access the filteredData from the query result and render the component accordingly.

By using the svelte-query library, you can easily manage your data fetching and filtering logic in a structured manner.

Conclusion

Filtering data using query strings in SvelteKit can be achieved through various approaches. You can utilize the built-in $page.query object to access the query string parameters and perform filtering logic. Alternatively, you can leverage the svelte-query library for a more structured approach to data management.

Choose the approach that best suits your project requirements and start filtering your data with ease in SvelteKit!