AngularJS - 如何根据下拉选项更改键值

Question

我正在将键推送到一个数组，我正在迭代它以获取dropdown中的选项。创建（键，值）对，数组中的键和选项是相同的。当我们更改下拉列表中的选项时，相应的值应以HTML格式呈现。

以下是代码：

$scope.viewItemKeys = [pencils, pens, books];

$scope.viewItemObj = {
    "pencils": {
      "0": {},
      "1": {},
      "2": {}
    },
    "pens": {
      "0": {},
      "1": {},
      "2": {},
      "3": {},
      "4": {}
    },
    "5": {},
    "6": {},
    "7": {}
  },
  "books": {
    "0": {},
    "1": {},
    "2": {},
    "3": {},
    "4": {}
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<select id="selId" ng-options="key as value for (key , value) in viewItemkeys" ng-model="selectedItem" ng-change='onItemChange()'></select>

如果我选择了关于键的笔（即1到7，内部笔），请帮助我，我需要渲染{}值

Answer 1

看看这个小提琴手here

你的viewItemObj有点不对劲

$scope.viewItemObj = {
"pencils": {
  "0": {},
  "1": {},
  "2": {}
},
"pens": {
  "0": {},
  "1": {},
  "2": {},
  "3": {},
  "4": {},
  "5": {},
  "6": {},
  "7": {}
},
"books": {
  "0": {},
  "1": {},
  "2": {},
  "3": {},
  "4": {}
}

};

那里有一个额外的'}'。 我修改了HTML如下

<select id="selId" ng-options="value as key for (key , value) in viewItemObj" ng-model="selectedItem" ng-change='onItemChange()'></select><br/>
  Selected Item - {{selectedItem | json}}

这将呈现您选择的键的值 如果您正在寻找，请告诉我。

修改
根据您的评论，我为您here创建了一个新的FIddle。这个新的小提琴将显示所选对象的值。我稍微修改了一下HTML：

<div ng-controller="MyCtrl">
  <select id="selId" ng-options="value as key for (key , value) in viewItemObj" ng-model="selectedItem" ng-change='onItemChange()'></select>
  <div ng-repeat="item in selectedItem">
    {{item.Name}}
  </div>
</div>

我还在你的对象中添加了一些虚拟数据

$scope.viewItemObj = {
    "pencils": {
      "0": {
        Name: "Camel"
      },
      "1": {
        Name: "Nataraj"
      },
      "2": {
        Name: "Space"
      }
    },
    "pens": {
      "0": {
        Name: "Camel"
      },
      "1": {
        Name: "Parker"
      },
      "2": {
        Name: "Fountain"
      },
      "3": {
        Name: "Dealer"
      },
      "4": {
        Name: "Gel"
      },
      "5": {
        Name: "Inker"
      },
      "6": {
        Name: "Mountain View"
      },
      "7": {
        Name: "Decor"
      }
    },
    "books": {
      "0": {
        Name: "The Da Vinci Code"
      },
      "1": {
        Name: "How to kill a Mocking Bird"
      },
      "2": {
        Name: "Tooth and Nails"
      },
      "3": {
        Name: "A song of Ice and Fire"
      },
      "4": {
        Name: "Dance with the Dragons"
      }
    }
  };