Bootstrap 4 Collapse - Ensuring that collapsed elements remain open when expanding other accordions

Can someone help me figure out how to keep an element open when another one is opened? Here is an example: https://getbootstrap.com/docs/4.0/components/collapse/

<div id="exampleAccordion" data-children=".item">
   <div class="item">
      <a data-toggle="collapse" data-parent="#exampleAccordion" href="#exampleAccordion1" aria-expanded="true" aria-controls="exampleAccordion1">
  Toggle item
      </a>
      <div id="exampleAccordion1" class="collapse show" role="tabpanel">
        <p class="mb-3">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed pretium lorem non vestibulum scelerisque. Proin a vestibulum sem, eget tristique massa. Aliquam lacinia rhoncus nibh quis ornare.
        </p>
      </div>
   </div>


<div class="item">
   <a data-toggle="collapse" data-parent="#exampleAccordion" href="#exampleAccordion2" aria-expanded="false" aria-controls="exampleAccordion2">
  Toggle item 2
   </a>
   <div id="exampleAccordion2" class="collapse" role="tabpanel">
      <p class="mb-3">
    Donec at ipsum dignissim, rutrum turpis scelerisque, tristique lectus. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vivamus nec dui turpis. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
      </p>
   </div>
</div>
</div>
javascripthtmlcssbootstrap-4

Answer №1

Give this a try, it should do the trick,

HTML
-----
<div class="container">
  <div class="accordion-option">
    <h3 class="title">Lorem Ipsum</h3>
    <a href="javascript:void(0)" class="toggle-accordion active" accordion-id="#accordion"></a>
  </div>
  <div class="clearfix"></div>
  <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
    <div class="panel panel-default">
      <div class="panel-heading" role="tab" id="headingOne">
        <h4 class="panel-title">
        <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
          Collapsible Group Item #1
        </a>
      </h4>
      </div>
      <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
        <div class="panel-body">
         content 1
        </div>
      </div>
    </div>
    <div class="panel panel-default">
      <div class="panel-heading" role="tab" id="headingTwo">
        <h4 class="panel-title">
        <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="true" aria-controls="collapseTwo">
          Collapsible Group Item #2
        </a>
      </h4>
      </div>
      <div id="collapseTwo" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingTwo">
        <div class="panel-body">
          content 2
        </div>
      </div>
    </div>
    <div class="panel panel-default">      
      </div>
    </div>
  </div>
</div>

CSS:
----
body {
  color: #6a6c6f;
  background-color: #f1f3f6;
  margin-top: 30px;
}

.container {
  max-width: 960px;
}

.panel-default>.panel-heading {
  color: #333;
  background-color: #fff;
  border-color: #e4e5e7;
  padding: 0;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.panel-default>.panel-heading a {
  display: block;
  padding: 10px 15px;
}

.panel-default>.panel-heading a:after {
  content: "";
  position: relative;
  top: 1px;
  display: inline-block;
  font-family: 'Glyphicons Halflings';
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  float: right;
  transition: transform .25s linear;
  -webkit-transition: -webkit-transform .25s linear;
}

.panel-default>.panel-heading a[aria-expanded="true"] {
  background-color: #eee;
}

.panel-default>.panel-heading a[aria-expanded="true"]:after {
  content: "\2212";
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}

.panel-default>.panel-heading a[aria-expanded="false"]:after {
  content: "\002b";
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}

.accordion-option {
  width: 100%;
  float: left;
  clear: both;
  margin: 15px 0;
}

.accordion-option .title {
  font-size: 20px;
  font-weight: bold;
  float: left;
  padding: 0;
  margin: 0;
}

.accordion-option .toggle-accordion {
  float: right;
  font-size: 16px;
  color: #6a6c6f;
}

.accordion-option .toggle-accordion:before {
  content: "Expand All";
}

.accordion-option .toggle-accordion.active:before {
  content: "Collapse All";
}

Javascript:
-----------
$(document).ready(function() {

  $(".toggle-accordion").on("click", function() {
    var accordionId = $(this).attr("accordion-id"),
      numPanelOpen = $(accordionId + ' .collapse.in').length;

    $(this).toggleClass("active");

    if (numPanelOpen == 0) {
      openAllPanels(accordionId);
    } else {
      closeAllPanels(accordionId);
    }
  })

  openAllPanels = function(aId) {
    console.log("setAllPanelOpen");
    $(aId + ' .panel-collapse:not(".in")').collapse('show');
  }
  closeAllPanels = function(aId) {
    console.log("setAllPanelclose");
    $(aId + ' .panel-collapse.in').collapse('hide');
  }

});

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