quay/static/directives/dropdown-select.html

<div class="dropdown-select-element" ng-class="selectedItem ? 'has-item' : ''">
  <div class="current-item">
    <div class="dropdown-select-icon-transclude"></div>
    <input type="text" class="lookahead-input form-control" placeholder="{{ placeholder }}"
           ng-readonly="!lookaheadItems || !lookaheadItems.length"></input>
  </div>
  <div class="dropdown">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">
      <span class="caret"></span>
    </button>    
    <div class="dropdown-select-menu-transclude"></div>
  </div>
  <div class="transcluded" ng-transclude>
</div>