Transitioning Dropdowns in Angular UI Bootstrap

Hello everyone, I am completely new to both Stack Overflow and AngularJS. I'm attempting to incorporate a fade-in animation into my dropdown (using UI Bootstrap's dropdown directive) without success.

This issue is quite similar to the following question: Bootstrap 3 dropdown transition However, I am curious if there is an Angular (without jQuery) method for achieving this?

I am thrilled to be posting my very first question here.

Below is the code snippet I am working with (taken directly from UI Bootstrap's default Dropdown):

<div class="btn-group" dropdown is-open="status.isopen">
    <button type="button" class="btn btn-primary dropdown-toggle" dropdown-toggle ng-disabled="disabled">
      Button dropdown <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" role="menu">
      <li><a href="#">Action</a></li>
      <li><a href="#">Another action</a></li>
      <li><a href="#">Something else here</a></li>
      <li class="divider"></li>
      <li><a href="#">Separated link</a></li>
    </ul>
  </div>

Here is the plunker showcasing the issue: http://plnkr.co/edit/CmAZv4DTeda4X0bnkQwQ

cssangularjsangular-ui-bootstrap

Answer №1

Enhanced to include fadein/out transition effects.

Check out this sleek CSS-only implementation. Please note that older browsers (< IE10) do not support CSS3 animations. Below is a guide on applying CSS3 animations to bootstrap's dropdown feature.

CSS transitions are activated when the specified property (or properties) change their values. For detailed information, refer to this article from MDN: https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions

For a Plunker demo, visit: http://plnkr.co/edit/bFj6NkfrVk0qJbG3gwFx?p=preview

CSS Styles 

.open > .dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.dropdown-menu {
  display: block;
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 500ms ease, visibility 500ms ease;
  -moz-transition: opacity 500ms ease, visibility 500ms ease;
  -o-transition: opacity 500ms ease, visibility 500ms ease;
  transition: opacity 500ms ease, visibility 500ms ease;
}

If you omit display: block, the transitions will not function correctly. Alternatively, using the visibility property maintains the desired effect. I previously had another example without visibility, but it necessitated managing the z-index which seemed less optimal.

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