How to Fetch Data Only Once in React/Redux and Angular 6+

Learn how to efficiently fetch data from an API only once when the component or screen is first accessed in React/Redux and Angular 6+ .
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How to Fetch Data Only Once in React/Redux and Angular 6+

Fetching data from an API is a common task in web development, especially when you're building dynamic applications. However, there are instances when you only want to fetch data once—such as when you're opening a modal dialog that requires specific configuration data. In this guide, we'll discuss how to implement this in both React with Redux and Angular 6+ .

The Problem

Imagine you have a feature where a modal dialog needs to display specific configuration settings. When the user first opens this dialog, you want to fetch the necessary data from an API. But, when they return to the dialog later, you don't need to fetch the configuration data again. The goal is to minimize unnecessary API calls while ensuring your application runs smoothly.

The Solution: Implementing in React/Redux

Step 1: Setting Up Redux State

In your Redux store, you'll need to initialize the state for the modal configuration. Here's how you can do it:

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

Step 2: Fetching Data in the Modal Component

In your modal component, you can leverage React hooks to manage the API call. Here's an example of how to implement this:

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

Step 3: Updating the Reducer

Next, you will need to define how the Redux reducer updates the state when the API call returns successfully. Here’s a simple reducer example:

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

Important Notes

Ensure you handle errors appropriately when fetching data.

You can enhance this approach by adding loading states or caching mechanisms for better user experience.

The Solution: Implementing in Angular 6+

If you are working with Angular 6+ , the approach is slightly different, but the principle remains the same.

Step 1: Service to Fetch Data

Start by creating a service that will handle fetching the configuration data from the API.

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

Step 2: Using the Service in Component

In your component, you can call this service when the modal is opened.

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

Important Notes

Utilizing tap from RxJS allows you to cache the data efficiently.

Ensure that the service is provided at the root level for global access.

Conclusion

Fetching data only once can greatly enhance the performance of your application and provide a smoother user experience. In both React/Redux and Angular 6+ , there are effective strategies for achieving this functionality. By effectively managing state and caching API responses, you can avoid unnecessary API calls while keeping your application responsive.

By following the steps outlined above, you can implement a solution that meets your needs and optimizes behavior when interacting with data-dependent components. Happy coding!