Question

对不起，如果这已经得到了回答，但有角度的md-select的行为让我开始喝酒。

我遇到的情况是我创建了一个包含一些字段和一个select元素的对象数组。我想预先选择select元素中的值，并且我得到了奇怪的行为。

这是HTML（使用角度材质）：

  <md-list>
    <md-list-item ng-repeat="condition in conditions track by $index">
      <div layout="row" flex>
        <div flex="5">
          &nbsp;&nbsp;
        </div>
        <div flex="25">
          <md-input-container>
            <label>From</label>
            <input required type="number" name="from" minvalue=0 maxvalue="100" ng-model="condition.from">
          </md-input-container>
        </div>
        <div flex="5">
          &nbsp;&nbsp;
        </div>
        <div flex="25">
          <md-input-container>
            <label>To</label>
            <input required type="number" name="to" minvalue=0 maxvalue="100" ng-model="condition.to">
          </md-input-container>
        </div>
        <div flex="5">
          &nbsp;&nbsp;
        </div>
        <div flex="25">
          <md-input-container>
            <label>Select Question</label>
            <md-select ng-model="condition.question[$index]" ng-model-options="{trackBy: '$value._id'}" required name="cQuestion">
            <md-option ng-repeat="question in questions | orderBy : '_id'" ng-selected="{{condition.question._id === question._id ? true : false}}" ng-value={{question}}>
              {{question.title}}
            </md-option>
            </md-select>               
          </md-input-container>
        </div>
        <div flex="5">
          &nbsp;&nbsp;
        </div>
      </div>
    </md-list-item>
  </md-list>

这里是创建我试图测试的值的js：

$scope.questions = [
  {title: 'Question 1', qtype: 1, _id:1},
  {title: 'Question 2', qtype: 2, _id:2},
  {title: 'Question 3', qtype: 3, _id:3},
  {title: 'Question 4', qtype: 4, _id:4},
  {title: 'Question 5', qtype: 5, _id:5}
];
$scope.conditions = [];
var condition = {};
condition.from = '';
condition.to ='';

condition.question = {title: 'Question 2', qtype: 2, _id:3};
$scope.conditions.push(condition);
 condition.from = '';
condition.to ='';

condition.question = {title: 'Question 5', qtype: 5, _id:5};
$scope.conditions.push(condition);

如果你运行它，你会发现两行都选择了问题5。看起来这个模型很困惑。

有关解决此问题需要采取哪些措施的想法？

Answer 1

您使用旧的＆＃34;条件＆＃34; -Object两次。但是你必须在推送后创建一个新的＆＃34;条件＆＃34; -Object。

var condition = {};
condition.from = '';
condition.to ='';

condition.question = {title: 'Question 2', qtype: 2, _id:3};
$scope.conditions.push(condition);

condition = {}; // <= this line was added
condition.from = '';
condition.to ='';

condition.question = {title: 'Question 5', qtype: 5, _id:5};
$scope.conditions.push(condition);

如何在ng-repeat内的md-select上设置初始值？

1 个答案: