Encountering difficulties when combining the Bootstrap 4 d-flex and d-none classes

Is there a way to hide an entire <div> by adding the d-none class with a jQuery function? It seems like the .d-none class does not work when combined with the .d-flex class.

Original Code

<div class="row d-flex align-items-center ping gatewayBtn reset"> </div>

Updated Code

<div class="row d-flex align-items-center ping gatewayBtn reset d-none"> </div>

I have checked the Bootstrap CSS and noticed that both classes use the !important rule.

An article mentioned that it cannot be overridden.

htmljquerycssbootstrap-4

Answer №1

Cascading Style Sheets (CSS) operate on a system where the "last declared takes precedence."

Within the bootstrap.css file, these styles are specified in a specific order:

.d-none { ... .d-flex { ...

This means that the second style will take precedence over the first (assuming all other factors are equal, such as the use of the !important rule and the display: property).

It's important to note that the order in which these classes appear in an element's class list is irrelevant; what matters is the order in which they are defined in the .css file.

As demonstrated in bootstrap 4.6, the display: property of d-flex will override that of d-none.

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="53313c3c27202721322313677d657d63">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">

<div id='div' class='d-flex d-none'>
example
</div>

The key is to redefine the d-none class after the d-flex class:

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ea8885859e999e988b9aaadec4dcc4da">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">

<style>
.d-none { display:none !important; }
</style>

<div id='div' class='d-flex d-none'>
example
</div>

While it's possible to make this adjustment directly in the bootstrap.css file, it's generally not recommended.

Instead, you should add a definition for d-none in your site.css and include site.css after all other CSS files - as shown in the example above with the <style> tag, to ensure it takes precedence over conflicting styles.

Answer №2

In addition to my previous solution, I have also devised a method using a jQuery function

var className = "gatewayBtn";

$('.'+className).toggleClass('d-flex').toggleClass('d-none');

Before adding the .d-none class, I first remove the .d-flex class.

The rationale behind this is that the d-flex class is meant to adjust the column within the row, but in this case, I want to hide the <div>. The d-flex class is only necessary when displaying the content of the <div>, so I remove the d-flex class before adding the d-none class.

Answer №4

It's true that the d-flex class takes precedence over d-none, as mentioned in all of the comments above. To tackle this issue, I opted for utilizing d-flex as an inline style instead of a class.

<div class="row align-items-center ping gatewayBtn reset" style="display: flex"> </div>

Subsequently, I resorted to using JavaScript to modify the style attribute to "display: none". This approach should prove useful for those employing the .show() or .toggle() JavaScript methods as well.

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