Collapse other sections when one is expanded

Question

I am working on Bootstrap 4 Collapse. Wanted to collapse other sections when one is expanded

So far I did is:

<p>
  <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
    content 1
  </a>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample2" aria-expanded="false" aria-controls="collapseExample2">
    Content 2
  </button>
</p>

<div class="collapse" id="collapseExample">
  <div class="card card-body">
    Content one here
  </div>
</div>
<div class="collapse" id="collapseExample2">
  <div class="card card-body">
    Content 2 here
  </div>
</div>

Live demo: Live Demo

Answer 1

Make use of data-parent attribute:

<div class="container" id="myGroup">
    <p>
        <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
            content 1
        </a>
        <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample2" aria-expanded="false" aria-controls="collapseExample2">
            Content 2
        </button>
    </p>

    <div class="collapse" id="collapseExample" data-parent="#myGroup">
        <div class="card card-body">
            Content 1 here 
        </div>
    </div>
    <div class="collapse" id="collapseExample2" data-parent="#myGroup">
        <div class="card card-body">
            Content 2 here 
        </div>
    </div>
</div>

I added the id to your container and also added the data-parent to your content sections, referencing this container through the id.