How to Update a List Instantly After Deleting an Item in Angular 13

Описание: Learn how to update your Angular 13 component's list immediately after an object deletion without refreshing the page.
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This video is based on the question https://stackoverflow.com/q/74729357/ asked by the user 'Aakash Singh' ( https://stackoverflow.com/u/20622036/ ) and on the answer https://stackoverflow.com/a/74729484/ provided by the user 'Aakash Singh' ( https://stackoverflow.com/u/20622036/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Update a List Instantly After Deleting an Item in Angular 13

When building a web application in Angular, one common challenge arises when dealing with dynamic lists. Specifically, how do you ensure that your list updates immediately after an item is deleted? This is crucial for maintaining a smooth user experience, particularly when users expect to see changes without page refreshes.

In this guide, we’ll walk through a practical example to demonstrate how you can easily achieve this in Angular 13.

Understanding the Scenario

Imagine you have a list of items that users can delete. After the deletion, you want the list to reflect this change right away. Let's explore how to effectively manage this in your Angular component.

The Current Code Setup

Let's review the provided code snippets to better understand what we have:

1. component.ts

Here, we see the function for deleting the source:

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

In this code:

We have a method deleteSource that takes an id.

The user is prompted to confirm the deletion.

Upon confirmation, the deleteSource method from the service is called, but we don’t currently perform any action to update the list.

2. service.ts

This is where the HTTP request for deletion is handled:

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

Here, we see a straightforward HTTP DELETE request that removes the item from the server.

3. component.html

The HTML button to trigger the deletion looks like this:

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

Users click this button to delete an item, but the list doesn't update afterward.

Implementing the Solution

To ensure the list updates immediately after a deletion, we need to call the method that retrieves the updated list in the subscription of our delete service. Here’s how to do it:

Step-by-Step Solution

Update the Delete Function: Modify the deleteSource method in your component to include a call to refresh the list after the deletion is confirmed.

Here’s the improved code:

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

Add the Method to Retrieve Sources: You may already have a method (commonly called getSources()) that fetches the updated list. Here’s a brief example:

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

Ensure Proper Subscription Handling: When deleting the source, ensure that the subscription observes what happens after the server responds, allowing your application to react accordingly.

Complete Component Example

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

Conclusion

By implementing the provided solution, you ensure that your Angular 13 application updates the list immediately after an item is deleted. Not only does this enhance usability, but it also contributes to a more engaging user experience.

To summarize, always ensure you fetch the updated list in the subscription to the deletion service, which allows you to maintain an accurate representation of your data without needing to refresh the page.