Preventing Loading State in Redux Toolkit When Data Is Already Fetched

Описание: Discover how to prevent unnecessary loading states in Redux Toolkit when users navigate back to previously visited pages after data has been fetched.
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How to Prevent Loading State in Redux Toolkit When Data Has Already Been Fetched

Navigating between pages within a React application is a common practice. However, one frustrating aspect of many web applications is the reappearance of loading states when users return to a previously visited page that already has data fetched. For instance, when a user visits the profile page, moves to the dashboard, and then returns to the profile page, you might want to avoid displaying the loading state again if the data has already been loaded. In this guide, we'll explore effective methods to address this problem using Redux Toolkit.

Understanding the Problem

In Redux, maintaining an efficient loading state is essential for a smooth user experience. When data is being retrieved, showing a loading state is a reasonable approach. However, if the data has already been fetched and is still in the store, displaying a loading element once again can be unnecessary and disruptive.

Current Implementation Overview

Consider the following code snippet where data fetching occurs:

[[See Video to Reveal this Text or Code Snippet]]

In this example:

status determines what to show (loading, fulfilled, or error).

If status === 'loading', a loader is displayed. On fulfillment, the fetched data is presented.

Here's how the reducer currently reacts to different fetching states:

[[See Video to Reveal this Text or Code Snippet]]

In the above reducer, the loading state is invoked every time the fetchProfile action is dispatched.

Solution Approaches

To prevent showing the loading state unnecessarily, you can implement one of two methods:

Method 1: Check Data Before Calling the API

In this approach, an API call is only made if the data is not already present. This means that once data is fetched, it will not be fetched again unless it's cleared or refreshed. Here’s how you can implement it:

[[See Video to Reveal this Text or Code Snippet]]

Key Points:

The API call is skipped if the data exists.

This ensures that the loading state is not triggered again.

Method 2: Check for Data in Pending State

In the second method, you adjust the pending state logic to manage what happens if data is already loaded. This allows you to update data in the background without displaying the loading state:

[[See Video to Reveal this Text or Code Snippet]]

Key Points:

The reducer checks if data is available before setting the status to 'loading'.

This approach allows data refreshes in the background while keeping users engaged without disruption.

Conclusion

Managing loading states efficiently enhances user experience by allowing users to interact with your application seamlessly. By utilizing either of the methods above in your Redux Toolkit setup, you can prevent unnecessary loading indicators and make your app more user-friendly. Choose the method that best suits your application's requirements and improve the way users navigate through your React application.

Now that you're equipped with these strategies, you can better control when loading states appear in your Redux Toolkit setup.