如何将一些值从 $scope.$on 返回到 $scope.$emit

Question

注释部分将位于$scope.$on下。我需要将选项返回到我保存$scope.$emit的地方。请帮忙

!!

if (gridConfig.Batch) {
                gridOption.dataSource.transport["parameterMap"] = function (options, operation) {
                    var data = {
                        options: options,
                        operation: operation
                    };
                    $scope.$emit('parameterMap', data);
                    //if (operation !== "read" && options.models) {
                    //    angular.forEach(options.models, function (value) {
                    //        value.MfgDt = kendo.toString(value.MfgDt, "s");
                    //        value.ExpDt = kendo.toString(value.ExpDt, "s");
                    //        value.ProductType = value.ProductType.Id;
                    //    })
                    //    return options;
                    //}
                }
            }

Answer 1

我不确定我是否理解你的问题，但如果我理解，你想要一个从你的$scope.$on到你的$scope.emit的回调函数。如果是这样，下面的代码将为您提供帮助，请告诉我它是否有效，因为我还没有测试过它。

if (gridConfig.Batch) {
            gridOption.dataSource.transport["parameterMap"] = function (options, operation) {
                var data = {
                    options: options,
                    operation: operation
                };
                $scope.$emit('parameterMap', data,function(returnedData){
                      //returnedData.options = the updated options
                });
            }
        }

$scope.$on：

$scope.$on('parameterMap', function (e, data,callback) {
    if (data.operation !== "read" && data.options.models) {
        angular.forEach(options.models, function (value) {
            value.MfgDt = kendo.toString(value.MfgDt, "s");
            value.ExpDt = kendo.toString(value.ExpDt, "s");
            value.ProductType = value.ProductType.Id;
        })
        callback(data);
    }
})

Answer 2

我认为你可以让它比其他答案简单得多，只需调整指令中的数据，并将其用作返回值。

if (gridConfig.Batch) {
            gridOption.dataSource.transport["parameterMap"] = function (options,   operation) {
                var data = {
                    options: options,
                    operation: operation
                };
                $scope.$emit('parameterMap', data);
                // by the time we reach here the directive 
                // will have altered the data object
                if (data.operation !== "read" && data.options.models) {
                    angular.forEach(options.models, function (value) {
                        value.MfgDt = kendo.toString(value.MfgDt, "s");
                        value.ExpDt = kendo.toString(value.ExpDt, "s");
                        value.ProductType = value.ProductType.Id;
                    })
                    return options;
                }
            }
        }

在指令中：

$scope.$on('parameterMap', function (e, data) {
   data.operation = "write" ; 
   data.options = {models: 'something here'} 
   // do something else here, whatever the purpose of the directive is
}