How to Hide One Collapse and Open Another with a Single Button in Angular and Bootstrap 4

Learn how to effectively use Angular and Bootstrap 4 to control collapsible elements, enabling the functionality to hide one collapse and open another using a single button click.
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How to Hide One Collapse and Open Another with a Single Button in Angular and Bootstrap 4

When developing user interfaces in Angular, especially with Bootstrap 4, you might encounter a scenario where you want to create collapsible elements that can be toggled. A common challenge is making one collapse section disappear while opening another with a single button. This post will walk you through how to achieve this functionality smoothly and effectively.

Understanding the Problem

Let’s say you have three collapsible sections (A, B, and C) laid out using Bootstrap. You want to ensure that when a user clicks on one section to open it, the currently opened section automatically closes. This creates a better user experience by preventing multiple sections from being opened at once, thereby keeping the interface clean and manageable.

The Initial Code

To start with, you may have a code structure similar to this:

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

In your TypeScript file, you’ll define the collapsed states:

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

The Issue

With this setup, when you click on section B, it only opens section B without closing section A first. This is where you need to implement a solution that keeps only one section open at a time.

Solution: Implementing Toggle Logic

Step 1: Modify the Click Event

To achieve the desired behavior, modify the click event of your nav links. Instead of directly toggling the collapsible elements, you can call a function that handles the closing and opening logic. For example, here’s how to change the click event:

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

Step 2: Create the Toggle Function

Next, create the toggle function in your TypeScript file. This function will handle which section is opening and ensure the others close:

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

Step 3: Update Collapse Directives Accordingly

Now when a user clicks on a section header, all others will close automatically, thanks to the boolean flags you set within the toggle function.

Final Implementation

Here’s how your final TypeScript component might look like:

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

Conclusion

By implementing the toggle function as demonstrated, you can efficiently manage the collapse of elements in your Angular application using Bootstrap 4. This not only improves user experience by making navigation simple but also ensures your UI remains neat and focused.

Don't hesitate to explore and customize this logic further to cater to your specific application needs!