javascript - ng-model 未从控制器中定义

Question

小提琴

你好，

为什么foo()函数的值未定义？

我发现问题在于型号名称是否只是brand但是，这不是我的问题。我的模型名称是car.brand.

所以我的问题是 - 如何从 ctrl 访问模型？

HTML：

<div ng-controller="MyCtrl">
  <div ng-if="cars" ng-repeat="car in cars">
    <br>
    <label>{{car.name}}</label>
    <br>
    <label>brand</label>
    <select ng-model="car.brand" ng-options="car as car.name for car in brands" ng-change="loadBrands($index)">
      <option value="">select</option>
    </select>
    <label>model</label>
    <select ng-model="brand.model" ng-options="car as car.model for car in cars[$index].models">
      <option value="">select</option>
    </select>

  </div>
  <button ng-click="foo()">
    save all
  </button>
</div>

JS：

$scope.foo = function() {
   alert("foo: " + $scope.car.brand);
 }

谢谢。

Answer 1

当您使用ng-repeat时，您将拥有许多汽车，因此您的模型将被填充到汽车中：

$scope.foo = function() {
   for(var i in $scope.cars) {
     alert("foo: " + $scope.cars[i].brand);
   }   
}

Answer 2

您需要使用car.brand as或car.model as

<div ng-controller="MyCtrl">
  <div ng-if="cars" ng-repeat="car in cars">
    <br>
    <label>{{car.name}}</label>
    <br>
    <label>brand</label>
    <select ng-model="car.brand" ng-options="car.brand as car.name for car in brands" ng-change="loadBrands($index)">
      <option value="">select</option>
    </select>
    <label>model</label>
    <select ng-model="brand.model" ng-options="car.model as car.model for car in cars[$index].models">
      <option value="">select</option>
    </select>

  </div>
  <button ng-click="foo()">
    save all
  </button>
</div>

或者做

<div ng-controller="MyCtrl">
  <div ng-if="cars" ng-repeat="car in cars">
    <br>
    <label>{{car.name}}</label>
    <br>
    <label>brand</label>
    <select ng-model="car" ng-options="car as car.name for car in brands" ng-change="loadBrands($index)">
      <option value="">select</option>
    </select>
    <label>model</label>
    <select ng-model="brand" ng-options="car.brand as car.model for car in cars[$index].models">
      <option value="">select</option>
    </select>

  </div>
  <button ng-click="foo()">
    save all
  </button>
</div>

之前的任何东西都是将获得as的价值ng-model