我在表單中有兩個下拉菜單。第一個下拉菜單有4個值,但是第二個下拉菜單隻有在第一個下拉菜單中選擇了具有索引3的值時纔有值,否則爲空。只有在AngularJs中具有值時才需要下拉菜單
代碼我總是進行驗證並檢查兩個下拉列表是否都有值。 有沒有一種簡單的方法來進行預成型的第二次下拉驗證,只要它的內部有值? 換句話說,如果下拉不爲空,那麼用戶必須選擇值。
這是我的下拉菜單代碼:
<form name="addNewTestSession" class="form-horizontal" novalidate>
<div class="row">
<div class="col-md-2" ng-class="{ 'has-error has-feedback': addNewTestSession.event.$touched && addNewTestSession.event.$invalid }">
<label for="event">Event<span class="mandatory">*</span></label>
<select id="event" name="event" class="form-control" ng-model="newTestSessionCtrl.formData.event"
ng-options="event.name for event in newTestSessionCtrl.viewData.events"
ng-required="true">
<option value="" disabled selected>Select</option>
</select>
<span ng-show="addNewTestSession.event.$touched && addNewTestSession.event.$invalid"
class="form-control-feedback fa fa-warning"
uib-popover="This field is required."
popover-trigger="'mouseenter'"
popover-placement="auto right"
popover-class="additional-info"></span>
</div>
<div class="col-md-2" ng-class="{ 'has-error has-feedback': addNewTestSession.subevent.$touched && addNewTestSession.subevent.$invalid }">
<label for="subevent">Sub-Event<span class="mandatory">*</span></label>
<select id="subevent" name="subevent" class="form-control" ng-model="newTestSessionCtrl.formData.subevent"
ng-options="subevent.name for subevent in newTestSessionCtrl.formData.event.subevents"
ng-required="true">
<option value="" disabled selected>Select</option>
</select>
<span ng-show="addNewTestSession.subevent.$touched && addNewTestSession.subevent.$invalid"
class="fa fa-warning form-control-feedback"
uib-popover="This field is required."
popover-trigger="'mouseenter'"
popover-placement="auto right"
popover-class="additional-info"></span>
</div>
</div>
</form>
正如你可以看到「子事件」下拉始終是必需的。我如何才能將其更改爲僅在內部具有值時才需要?