量角器：从弹出值中选择元素

Question

我们有一些文本框，需要从弹出列表中选择值。元素和弹出窗口是这样的：相关的html代码如下：<div _ngcontent-c6="" class="col px-0">  <input _ngcontent-c6="" aria-multiline="false" autocapitalize="off"     autocorrect="off" class="form-control ng-dirty ng-valid open ng-touched"    formcontrolname="ESYSITENAME" id="esySiteName" name="" placeholder=""     role="combobox" type="text" autocomplete="off" aria-autocomplete="list"    aria-expanded="true" aria-activedescendant="ngb-typeahead-2-0"     aria-owns="ngb-typeahead-2">  <ngb-typeahead-window class="dropdown-menu show ng-star-inserted"     role="listbox" id="ngb-typeahead-2" style="top: 39px; left: 0px;">    <button class="dropdown-item ng-star-inserted active" role="option"       type="button" id="ngb-typeahead-2-0">      <ngb-highlight _ngcontent-c6="" _nghost-c25="" class="ng-star-inserted">          <span _ngcontent-c25="" class="ngb-highlight ng-star-inserted">              Bull Run Elementary School          </span>      </ngb-highlight>    </button>  </ngb-typeahead-window></div>我尝试使用不同的策略来选择Popup元素，例如：let EsyNamePopup = $('#ngb-typeahead-2-0 > ngb-highlight > span');await helpers.waitForElementVisibility(EsyNamePopup);await helpers.clickWhenClickable(EsyNamePopup);// or following way:let EsyNamePopup = element(by.cssContainingText('span', 'Bull Run Elementary School,));await EsyNamePopup.click();他们都不工作，但收到以下错误消息：NoSuchElementError：使用定位器找不到任何元素：By（css选择器，＃ngb-typeahead-2-0> ngb-highlight> span）是否有更好的策略来选择这些元素？