Скачать или смотреть How to Enforce a Div to Maintain Its Size During Collapse in Bootstrap 4.3.1

Learn how to prevent a div from resizing when toggling collapsed elements in Bootstrap 4.3.1 by using the visibility property.
---
This video is based on the question https://stackoverflow.com/q/63759376/ asked by the user 'Johnny Wu' ( https://stackoverflow.com/u/2896880/ ) and on the answer https://stackoverflow.com/a/63764686/ provided by the user 'Johnny Wu' ( https://stackoverflow.com/u/2896880/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: how to enforce a div to size itself to include the collapsed elements

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Enforce a Div to Maintain Its Size During Collapse in Bootstrap 4.3.1

When working with Bootstrap 4.3.1, you may encounter scenarios where you want to have collapsed elements within a div, but you don't want the div itself to change size when these elements are toggled. If you've found yourself in this situation, you're not alone. This issue often leads to an unattractive layout where the parent div expands and collapses awkwardly every time child elements are shown or hidden. Fortunately, there's a straightforward solution to this problem.

The Problem: Resizing Divs with Collapsible Elements

Let's say you have a div, styled as a "white rounded box," that contains buttons and other elements, including a collapsible component. When you toggle the visibility of the collapsed elements (for example, through a button click), the div expands and contracts, which can lead to a frustrating user experience due to the constantly changing layout.

Your HTML structure might look something like this:

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

In this example, MyBox represents the collapsed element, and the question is how to keep the "white rounded box" from resizing when MyBox is toggled.

The Solution: Using the Visibility Property

To tackle this problem effectively, you can modify how Bootstrap handles the visibility of the collapsible elements. By default, Bootstrap often uses the display: none; style when elements are collapsed. This causes the parent div to resize accordingly since the child elements no longer occupy space.

Step-by-Step Guide

Change Collapse Methodology: Instead of relying on Bootstrap's default collapse behavior, you can make your collapsible elements maintain their space by manipulating the visibility property instead of display. Here's how this works:

Normally, display: none; removes the element from the document flow, causing the parent to adjust sizing.

Using visibility: hidden; keeps the element in the document flow but makes it invisible. Thus, the parent div will not resize.

Implement Custom JavaScript: You can write a function that will toggle the visibility of your collapsible elements. Here’s a simple example:

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

Modify the Button Behavior: Next, link the button actions to this visibility toggle rather than the Bootstrap collapse function:

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

Benefits of This Approach

Consistent Layout: Your div will maintain its size regardless of whether the collapsed elements are shown or hidden, providing a stable user interface.

Simple Implementation: This method doesn't require extensive changes to your existing Bootstrap setup; you merely need to make minor adjustments to JavaScript and CSS.

Conclusion

In conclusion, managing the size of a div containing collapsible elements in Bootstrap 4.3.1 can be effectively handled by switching from the default collapse method to manipulating the visibility property. This approach ensures your "white rounded box" remains consistently sized, improving the overall aesthetic and functionality of your application. Give it a try, and see how it transforms your layout!