AngularJS 재질 드롭 다운 옵션이 작동하지 않습니다.

Question

AngularJS 재질을 사용하여 양식을 작성하려고하는데 내 드롭 다운 옵션이 표시되는 데 문제가 있습니다. 내 HTML이 내 서버 스크립트의 개체 배열에 저장됩니다. 아래에서 내가 뭘 잘못하고 있니?

<md-input-container class="md-block" flex-gt-sm ng-switch-when="choice"> 
    <label for="{{element.section_element_name}}">{{element.section_element_label}}</label> 
    <md-select id={ {element.section_element_name}} type="selectbasic" value={{element.q_value}}> 
     <md-option ng-repeat="option in element.section_element_choices" value="{{option.element_choice_value}}"> 
      {{option.element_choice_label}} 
     </md-option> 
    </md-select> 
</md-input-container> 

Answer 1

<md-input-container class="md-block" flex-gt-sm ng-switch-when="choice"> 
    <label for="{{element.section_element_name}}">{{element.section_element_label}}</label> 
    <md-select id={ {element.section_element_name}} type="selectbasic" ng-model="selectedItem"> 
    <md-option ng-repeat="option in element.section_element_choices" value="{{option.element_choice_value}}"> 
     {{option.element_choice_label}} 
    </md-option> 
</md-select>