IE8上的Angular，select元素中的显示数据无法正常工作

Question

我尝试用角度来构建一个处方集但是在select元素中显示数据并不起作用......

formulary.cs.html：

    <table style="display: inline-block; float: left; max-width: 510px;">
        <tr data-ng-repeat="question in group.questions">
            <td>{{question.name}}</td>
            <td>
                 <div ng-switch on="question.control" style="display: inline-block;">
                     <div ng-switch-when="input">
                          <input type="text" style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}" placeholder="{{question.default_value}}" maxlength="{{question.max_length}}" />
                     </div>
                     <div ng-switch-when="textarea">
                      <textarea style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}" placeholder="{{question.default_value}}"></textarea>
                     </div>
                     <div ng-switch-when="checkbox">
                          <input type="checkbox" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}" />{{question.default_value}}
                     </div>
                     //MY PROBLEM HERE !
                     <div ng-switch-when="select">
                          <select style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}">
                                                <option ng-repeat="choice in question.default_value" value="{{choice.value}}">{{choice.name}}</option>
                          </select>

                          <select style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}" ng-model="question" ng-options="choice.value for choice in question.default_value">
                          </select>

                      </div>
                      <div ng-switch-when="p">
                           <p style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}"><b>{{question.default_value}}</b></p>
                      </div>
                      <div ng-switch-default>
                           <!-- default action -->
                      </div>
                  </div>
             </td>
             <td>
                  <div ng-if="question.unity_variable == true">
                       <select>
                           <option ng-repeat="unit in question.unity">{{unit.value}}</option>
                       </select>
                  </div>
                  <div ng-if="!question.unity_variable">
                       {{question.unity}}
                  </div>
             </td>
        </tr>
   </table>

我看了Using AngularJS, how do I bind a <select> element to an attribute that updates via a service

在我的浏览器中，显示标签，但不显示选择中的选项。

左边的

方法：

<select style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}" ng-model="question" ng-options="choice.value for choice in question.default_value">
</select>

在右边，方法：

<select style="width: {{ question.size }};" data-isnull="{{question.isnull}}" name="{{question.dbcolumn}}" id="{{question.dbcolumn}}">
      <option ng-repeat="choice in question.default_value" value="{{choice.value}}">{{choice.name}}</option>
</select>

你能帮我找一下我的错误吗？ THX

Answer 1

请勿ng-repeat使用select/option。描述here的正确用法是：

<select ng-model="form.question"
    ng-options="choice.value as choice.name for choice in question.default_value">
</select>

为了使所选选项正确显示，choice.value部分必须等于ng-model定义的值（在前面的示例form.question中）。我不知道你的模型，让我们考虑一下：

question.default_value = [
    {name: "Alpha", value: "a"},
    {name: "Beta",  value: "b"}
];

如果form.question === "a"，则选择第一个选项;如果是form.question === "b"第二个，依此类推。您可以选择整个对象：

<select ng-model="form.question"
    ng-options="choice.name for choice in question.default_value">
</select>

在这种情况下，将form.question初始化为：

form.question = question.default_value[0];
// the index, in this example 0, is that of the selected element

在这种情况下，对象必须与===相等;它们的属性不足以匹配。