AngularJS:如何在ng-repeat中获取索引值？

Question

我是新来的angularjs，我想获取ng-repeat中的索引值，这意味着我想将md-option值设置为索引值，我的代码是:

<md-input-container class="md-block" flex-gt-sm>
    <label>Filterable Columns</label>
        <md-select ng-model="visualization.filterable_columns" ng-change="drawFilters()" multiple="true" ng-init="index = 1">
            <md-option ng-repeat="filterable_column in vm.filterable_columns" value="{{index++}}">
                {{filterable_column.label}
            </md-option>
        </md-select>
</md-input-container>

有人可以帮我吗？

Answer 1

您可以这样尝试:

<md-input-container class="md-block" flex-gt-sm>
    <label>Filterable Columns</label>
        <md-select ng-model="visualization.filterable_columns" ng-change="drawFilters()" multiple="true">
            <md-option ng-repeat="filterable_column in vm.filterable_columns" ng-value="{{$index}}">
                {{filterable_column.label}}
            </md-option>
        </md-select>
</md-input-container>