How to Display a Loading Spinner During Component Navigation in Angular 2

Discover how to effectively show a `spinner` or `loading` screen when navigating between components in Angular 2. Learn to enhance user experience during asynchronous operations.
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This video is based on the question https://stackoverflow.com/q/66412665/ asked by the user 'Codemaster' ( https://stackoverflow.com/u/14639530/ ) and on the answer https://stackoverflow.com/a/66412930/ provided by the user 'prashant Jha' ( https://stackoverflow.com/u/6054836/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display a Loading Spinner During Component Navigation in Angular 2

In the world of modern web applications, a seamless user experience is paramount. However, there are moments when users must wait for a response, especially during navigation between components or when waiting for asynchronous data to load. This guide addresses a common challenge faced by Angular developers: how to display a spinner while waiting for the observable and query parameters during navigation between components.

The Problem at Hand

Imagine you have two components in your Angular application: Checkout and OrderSummary. When a user completes an order in the Checkout component by clicking a button, a service called createOrder() is invoked. This service fetches order details asynchronously and, once completed, navigates to the OrderSummary component while passing the order object as query parameters.

While this process is happening, users can be left staring at a blank screen while they wait for the navigation to complete. This can be frustrating, which is why we need to implement a loading spinner to indicate that a process is taking place.

Solution: Displaying a Spinner During Navigation

To effectively show a loading spinner during the navigation process, we can leverage Angular's navigation promise feature. Here’s how you can accomplish this in a few simple steps:

Step 1: Modify the onSubmit Method

First, you'll need to enhance the onSubmit method in the Checkout component to show the spinner before the navigation and hide it afterward.

Here's how to implement this:

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Step 2: Implement the Loader Methods

Now that you've modified the onSubmit method to handle the spinner, you need to implement the methods showLoader and hideLoader. Here's a simple example of what these methods could look like:

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

In your HTML template, you can then conditionally display the spinner based on the isLoading variable, for example:

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

Step 3: Style the Spinner

To enhance user experience, don’t forget to style your spinner. Here is a sample CSS:

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

Conclusion

By following the steps outlined above, you can greatly improve the user experience in your Angular application by displaying a loading spinner during navigation. Not only does this visual feedback reassure users that their actions are being processed, but it also adds a professional touch to your application. Happy coding!

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