javascript - 获取 Angular 中所选选项的 $index

Question

例如：

<select ng-model="selectedCategory" ng-options="category as category.title for category in categories"></select>

显然，这是行不通的：

<button ng-click="removeCategory($index)">remove</button>

如果不在中继器中，如何访问 $index？

Answer 1

您不需要跟踪索引，只需从 removeCategory 函数中的类别模型中删除 selectedCategory ：

你的控制器可能看起来像这样JSFiddle：

app.controller("myCtrl", ['$scope', function($scope){
  $scope.model = {
    selectedCategory: {},
    categories: [
        {title: "Cat1"},
        {title: "Cat2"}
    ]
  }
  //init
  $scope.model.selectedCategory = $scope.model.categories[0];

  $scope.removeCategory = function(){
    var ind = $scope.model.categories.indexOf( $scope.model.selectedCategory );
    $scope.model.categories.splice( ind, 1 );
    $scope.model.selectedCategory = $scope.model.categories[0];
  }
}])