Customize the header color of open panels in Bootstrap 4

Within my HTML templates, which are based on Bootstrap 4.3.1, I successfully altered the behavior of accordions thanks to support from the Stack Overflow community. Now, only one panel can be open at a time, automatically closing any previously opened panels when a new one is activated. To customize the active panel's appearance, I utilized aria attributes like so:

.accordion .card .card-header button[aria-expanded="true"] {
  background-color:#0965AC;
  color: #ffffff;
}

You can view a demonstration on this CodePen (the relevant code is located towards the end of the CSS).

However, upon loading the page with a specific panel set to initially display using class="collapse show", the card header of that panel does not reflect the blue background. Only after toggling the panel closed and then open again does the desired background appear.

Does anyone have suggestions on how I can ensure that the blue background is applied to the open panel upon page load?

I attempted the following without success:

.accordion .card .card-header button[class="collapse show"] {
  background-color:#0965AC;
  color: #ffffff;
}
htmlcssbootstrap-4bootstrap-accordion

Answer №1

To modify your CSS, adjust the aria-expanded="false" value in your JavaScript to aria-expanded="true" depending on the specific element you wish to expand. Replace the line $(value).find(...) with the code below to automatically expand the first element upon loading:

if (num == 1) {
     $(value).find(".card-header > .card-title").wrapInner( "<button  class=\"btn btn-link\" type=\"button\" data-toggle=\"collapse\" aria-expanded=\"true\"></button>");
} else {
     $(value).find(".card-header > .card-title").wrapInner( "<button  class=\"btn btn-link\" type=\"button\" data-toggle=\"collapse\" aria-expanded=\"false\"></button>");
}

The reason why 

.accordion .card .card-header button[class="collapse show"]
is not functioning can be attributed to two factors. Firstly, ensure that you use 
.accordion .card .card-header button.collapse.show
, indicating that the button element should have both the collapse and show classes for the specified CSS rules to apply. Moreover, these classes are not applied to the button upon clicking it, necessitating a toggle of the show class for the CSS changes to take effect.

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