Tips for inserting a dropdown arrow below caret on Bootstrap 4

I'm currently utilizing the dropdown feature in Bootstrap 4.

My goal is to include an upward arrow for the dropdown menu positioned in the top left corner.

In Bootstrap 3, we could utilize caret markup on the button to easily add the arrow to the dropdown menu.

However, in Bootstrap 4, there isn't a caret markup available; adding only the caret through the dropdown-toggle class.

Is there a way to add an arrow to the dropdown menu in this scenario?

Here's an example from Bootstrap 3 that showcases the desired functionality:

https://www.bootply.com/QD8FO89DcY

The same level of functionality is required for Bootstrap 4 as well.

htmlcss

Answer №1

If you're using Bootstrap 4, the caret/arrow in dropdown menus has been removed. You can add it yourself by using custom CSS like in the snippet below.

.dropdown-menu-arrow {
  top: -25px;
  left: 50%;
  width: 0;
  height: 0;
  position: relative;
}
.dropdown-menu-arrow:before,
.dropdown-menu-arrow:after {
  content: "";
  position: absolute;
  display: block;
  width: 0;
  height: 0;
  border-width: 7px 8px;
  border-style: solid;
  border-color: transparent;
  z-index: 1001;
}
.dropdown-menu-arrow:after {
  bottom: -18px;
  right: -8px;
  border-bottom-color: #fff;
}
.dropdown-menu-arrow:before {
  bottom: -17px;
  right: -8px;
  border-bottom-color: rgba(0,0,0,.15);
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

<div class="btn-group">
  <div class="btn-group">
    <button id="customDropdown" type="button" class="btn btn-outline-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </button>
    <div class="dropdown-menu" aria-labelledby="customDropdown">
      <span class="dropdown-menu-arrow"></span>
      <a class="dropdown-item" href="#">Dropdown link</a>
      <a class="dropdown-item" href="#">Dropdown link</a>
    </div>
  </div>
</div>

Answer №2

Give this a shot

.dropdown-menu::before {
    border-bottom: 9px solid rgba(0, 0, 0, 0.2);
    border-left: 9px solid rgba(0, 0, 0, 0);
    border-right: 9px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    left: 5%; /* position */
    position: absolute;
    top: -8px;
}

.dropdown-menu::after {
    border-bottom: 8px solid #FFFFFF;
    border-left: 9px solid rgba(0, 0, 0, 0);
    border-right: 9px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    left: 5%; /* position */
    position: absolute;
    top: -7px;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

<div class="btn-group">
  <div class="btn-group">
    <button id="customDropdown" type="button" class="btn btn-outline-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown
    </button>
    <div class="dropdown-menu" aria-labelledby="customDropdown">
      <a class="dropdown-item" href="#">Dropdown link</a>
      <a class="dropdown-item" href="#">Dropdown link</a>
    </div>
  </div>

/* for shadow */
.dropdown-menu::before {
    border-bottom: 9px solid rgba(0, 0, 0, 0.2);
    border-left: 9px solid rgba(0, 0, 0, 0);
    border-right: 9px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    left: 5%; /* position */
    position: absolute;
    top: -8px;
}

.dropdown-menu::after {
    border-bottom: 8px solid #FFFFFF;
    border-left: 9px solid rgba(0, 0, 0, 0);
    border-right: 9px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    left: 5%; /* position */
    position: absolute;
    top: -7px;
}

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