What is the best way to incorporate animation into Bootstrap dropdowns?

Is there a way to incorporate animation into the dropdown feature? I'm assuming it can be achieved by adjusting popperConfig, but how exactly?

Currently, the dropdown-menu has an automatically generated inline style, for example:

position: absolute; inset: 0px auto auto 0px; margin: 0px; transform: translate3d(0px, 40px, 0px);

Adding transition: translate .3s ease is one option, but what if I want to customize the direction or implement something more intricate?

Answer №1

Let's take a look at an example where the dropdown menu, named dm-example, will be displayed.
The HTML structure closely resembles Bootstrap5 examples:

    <div class="dropdown">
        <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
          Dropdown button
        </button>
        <ul id="dm-example" class="dropdown-menu " aria-labelledby="dropdownMenuButton1 ">
            <li><a class="dropdown-item " href="# ">Action</a></li>
            <li><a class="dropdown-item " href="# ">Another action</a></li>
            <li><a class="dropdown-item " href="# ">Something else here</a></li>
        </ul>
    </div>

When it comes to CSS animations:
#dm-example.show - this sets the initial styles for the block;
#dm-example.show .dropdown-item - this sets the initial styles for inner items;
dm-animation - refers to the animation on the block;
item-animation - refers to the animation on each item.

    <!-- Animate dropdown -->
     <style>
        #dm-example.show {
            position: fixed;
            animation-name: dm-animation;
            animation-duration: 2s;
        }
        
        #dm-example.show .dropdown-item {
            margin-bottom: 0;
            animation-name: item-animation;
            animation-duration: 2s;
        }
        
        @keyframes dm-animation {
            0% {
                margin-top: 0px;
            }
            50% {
                margin-top: 25px;
            }
            75% {
                margin-top: 5px;
            }
            100% {
                margin-top: 0px;
            }
        }
        
        @keyframes item-animation {
            0% {
                margin-bottom: 0px;
            }
            50% {
                margin-bottom: 25px;
            }
            75% {
                margin-bottom: 5px;
            }
            100% {
                margin-bottom: 0px;
            }
        }
    </style>

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