openproject/frontend/app/components/wp-relations/wp-relations-create/wp-relations-autocomplete/wp-relations-autocomplete.template.html

<form name="add_relation_form" class="form">
   <div class="dropdown-wrapper">
      <ui-select
              ui-select-focus-fix
              class="inplace-edit--select -full-width"
              ng-model="selectedWpId"
              on-select="onSelect($model)"
              append-to-body="true"
              required
              theme="select2"
              tabindex="0">
        <ui-select-match tabindex="-1">{{ $select.selected.to_s }}</ui-select-match>
        <ui-select-choices
          refresh-delay="250"
          refresh="autocompleteWorkPackages($select.search)"
          repeat="item.id as item in options | filter: item.config.canAdd">
            <div ng-bind="item.to_s"></div>
        </ui-select-choices>
      </ui-select>
    </div>
</form>