Div splits into two when positioned absolutely

Currently, I am playing around with Bootstrap 4 and have a card nested inside a card-columns:

<div class="card-columns">
   <div class="card">
      <div class="card-block">
         <h4 class="card-title">iPhone 5S</h4>
         <h6 class="card-subtitle text-muted">Rp. 8.999.999</h6>
      </div>
      <img data-src="holder.js/100%x200" alt="100%x200" data-holder-rendered="true" style="height: 200px; width: 100%; display: block;">
      <div class="card-block">
         <p class="card-text">Apple iPhone 5S is the most advanced phone from Apple. Get it at a special price from Shopoza! Enjoy 0% installment
         </p>
         <div class="btn-group open">
            <a href="#" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">Add to cart</a>
            <div class="dropdown-menu" style="
               /* min-height: 100%; */
               /* overflow: auto; */
               /* max-height: 100%; */
               /* height: 100%; */
               ">
               <a class="dropdown-item" href="#">Action</a>
               <a class="dropdown-item" href="#">Another action</a>
            </div>
         </div>
         <a href="#" class="btn btn-secondary card-link">Quick checkout</a>
      </div>
      <!-- card block -->
   </div>
   <!-- card -->
</div>

The card-columns itself is within a container that has a row with a single col-sm-12 column.

This is what appears on the screen:

Button menu displayed into half

What seems to be the issue here? The dropdown-menu div class has absolute positioning.

csstwitter-bootstraptwitter-bootstrap-4bootstrap-4

Answer №1

The layout in your example utilizes the .card-column class, which relies on the CSS property column. By default, the column-count within the .card-column layout is set to 3.

Despite the position value of absolute for the .dropdown-menu, there may not be enough space for it to display in the first column due to insufficient height. As a result, it may appear at the top of the next column.

An initial solution could involve increasing the margin-bottom of the .card elements. However, this approach would introduce gaps between columns and create issues when adjusting the column-count for smaller screens or adding more items to the 

.dropdown-menu</code.</p>

<p>A more effective resolution is to implement a <code>.card-deck
layout with display: flex. Below is an illustration:

@import url('https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha/css/bootstrap.min.css');

.card-deck {
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
}

.card-deck .card {
  flex: 0 1 22.5rem;
  margin: 0 .25rem .50rem;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha/js/bootstrap.min.js"></script>

<div class="container">
  <div class="row">
    <div class="card-deck">
      <div class="card">
        <div class="card-block">
          <h4 class="card-title">iPhone 5S</h4>
          <h6 class="card-subtitle text-muted">Rp. 8.999.999</h6>
        </div>
        <img src="http://placehold.it/380x200" class="img-responsive"/>
        <div class="card-block">
          <p class="card-text">Apple iPhone 5S adalah handphone tercanggih dari Apple. Dapatkan
            dengan harga khas dari Shopoza! Nikmati cicilan 0%
          </p>
          <div class="btn-group">
            <a href="#" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Add to cart</a>
            <div class="dropdown-menu">
              <a class="dropdown-item" href="#">Action</a>
              <a class="dropdown-item" href="#">Another action</a>
            </div>
          </div>
          <a href="#" class="btn btn-secondary card-link">Quick checkout</a>
        </div>
      </div>
      <!-- additional cards -->
    </div>
  </div>
</div>

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