如何基于在Angularjs

Question

一些条件使范围的变量在控制器

我在Angularjs控制器代码如下：

$scope.validElements = [          
           { 
            "id": "One",    
           }, 
           { 
            "id": "Two", 
           }, 
           { 
            "id": "Three", 
           }, 
           { 
            "id": "Four", 
           } 
          ]; 

我怎样才能让validElements根据病情 (if(someService.someElement == "ABC"))然后

$scope.validElements = [          
           { 
            "id": "One",    
           }, 
           { 
            "id": "Three", 
           }  
         ]; 

是不同的

否则

$scope.validElements = [          
           { 
            "id": "One",    
           }, 
           { 
            "id": "Two", 
           }, 
           { 
            "id": "Three", 
           }, 
           { 
            "id": "Four", 
           } 
         ]; 

PLE如果有可能或者有任何粗略的想法，可以提出建议

Answer 1

看来你想创建另一个作用域变量，并将其设置为someService，然后在someSome元素上放置一个监视器。然后，您可以在监视功能中处理该情况。我这样做是为了观察服务变量

$scope.validElements = [ // set default here    
     { 
      "id": "One",    
     } // ... 
    ]; 
    $scope.someService = someService; 
    $scope.$watch('someService.someElement', function(newValue, oldValue) { 
     // or a switch statment 
     if(newValue == 'ABC'){ 
      $scope.validElements = [          
        { 
         "id": "One",    
        }, 
        { 
         "id": "Three", 
        }  
      ]; 
     }else{ 
      // handle else condition 
      $scope.validElements = [          
        { 
         "id": "One",    
        }, 
        { 
         "id": "Two", 
        }, 
        { 
         "id": "Three", 
        }, 
        { 
         "id": "Four", 
        } 
      ]; 
     } 
    }); 

希望这有助于！祝您好运