Fixing the Angular Spinner Hide Issue

Описание: Discover how to resolve the spinning loader not hiding in your Angular application, including troubleshooting practical tips and best practices.
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This video is based on the question https://stackoverflow.com/q/68526307/ asked by the user 'Grim Stone' ( https://stackoverflow.com/u/15572368/ ) and on the answer https://stackoverflow.com/a/68526867/ provided by the user 'godhar' ( https://stackoverflow.com/u/6364117/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Angular Spinner Hide Issue: A Comprehensive Guide

Are you having trouble with an Angular Spinner that refuses to hide even when your HTTP GET requests are finished? You're not alone! This is a common issue that can frustrate many developers. In this guide, we'll break down the problem and offer a clear solution to get everything working smoothly.

Understanding the Problem

The issue arises when you have a spinner service that should hide the spinner after all of your HTTP requests complete. However, in some cases—like the one where the spinner isn't hiding even after the network requests seem completed—this can be confusing. The first step in solving this problem is understanding the asynchronous nature and behavior of your HTTP requests within Angular.

Symptoms

Spinner remains visible after GET requests finish.

HTTP calls seem to complete successfully according to the network tab in developer tools, but spinner remains visible on the UI.

Analyzing the Code

Let's take a closer look at the relevant pieces of code you are currently working with.

Spinner Service Example

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

HTTP Service Example

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From these code snippets, we can see that the spinner is intended to show whenever an HTTP request begins and hide at the end of the request. The issue appears to lie in how the HTTP requests are handled.

An Important Insight

The HTTP client requests in Angular are cold, meaning they do not execute until you actively subscribe to them. If a request is not subscribed, the code in the finalize block may never run, and consequently, the spinner never hides.

The Solution

To fix the issue, you need to ensure that your HTTP calls are subscribed to, allowing the spinner to behave as expected. Here's how you can modify the HTTP request in the service:

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

Key Changes Made:

Subscription to the Observable: Calling .subscribe() ensures the HTTP request executes.

Hide Spinner Immediately: Now, when the request successfully completes, the spinner is hidden right after the subscription callback is executed.

Conclusion

By subscribing to your HTTP requests, you not only ensure that the requests execute but also control the visibility of your spinner effectively. It's crucial to understand the behavior of Observables and how they interact with UI elements like spinners in Angular.

If you continue to experience issues, double-check your HTTP calls, ensure all parts of your service are functioning correctly, and that your spinner service is being called properly.

By implementing these best practices, you can create a seamless user experience in your Angular applications. Happy coding!