当范围更改时，Angualrjs从工厂获得价值

Question

我有工厂用于获取具有条件的数据。我想要的是什么时候换工厂也需要更新。

$scope.format=1;  
homefact.get_download_format($scope.format).then(function (response) { 
     $scope.download = response; 
    }); 

//watch scople format 
    $scope.$watch("format", function (newValue, oldValue) { 
     if ($scope.format === 1) { 
     //recall the get_donwload_format here with new value 

     } else { 
      //recall the get_donwload_format here with new value 
     } 
    }); 

谢谢！

Answer 1

包裹服务周围的函数，调用它的手表功能

$scope.format=1;  
callDownload($scope.format); 

function callDownload(newValue){ 
homefact.get_download_format(newValue).then(function (response) { 
    $scope.download = response; 
}); 
} 

$scope.$watch("format", function (newValue, oldValue) { 
     if ($scope.format === 1) { 
     callDownload(newValue) 

     } else { 
      //recall the get_donwload_format here with new value 
     } 
}); 

Answer 2

里面我看不到的if/else使用，因为你要调用与newValue每当$scope.format变化的服务方法。

所以这是可以做到这样的：

$scope.format=1;  
    homefact.get_download_format($scope.format).then(function (response) { 
     $scope.download = response; 
    }); 

    //watch scople format 
    $scope.$watch("format", function (newValue, oldValue) { 
    if(newValue != oldValue && newValue) { 
     homefact.get_download_format(newValue).then(function (response) { 
      $scope.download = response; 
     }); 
    } 
    });