Angularjs 角度+；D3-从单击事件获取要在模板中显示的范围值

我正在使用D3和Angular开发一个地图应用程序，在模板中显示点击事件的范围值时遇到了一个问题

我的指示：

angular.module("maineMap")
    .directive("ngMap", ["appConfig", function(config){

        function countyClickHandler(d, i, scope){
            scope.currentCounty(d.properties.fips);
                console.log(scope.countySelection);
        }

        function initMap() {

            //.... other code

            g.append("g")
            .attr("class", "counties")
            .selectAll("path")
            .data(scope.mapData.features)
            .enter()
            .append("path")
            .attr("d", path)
            .attr("class", function(d){
                return d.properties.name;
            })
            .on("click", function(d, i){
                countyClickHandler(d, i, scope);
            });

        }

        return {
            restrict : "E",
            link : function(scope, el, attrs){
                initMap(scope, el);
            }
        };
    }]);

我的控制器：

angular.module("maineMap")
.controller('MapCtrl', ['$scope','MapService', function($scope, MapService){
    //execute data fetches via promises on template load
    $scope.mapData = MapService.getMapPaths().getData();
    $scope.cityData = MapService.getCityPositions().getData();
    $scope.countyData = MapService.getMapData().getData();

    $scope.countySelection = {};
    $scope.currentCounty = function(fips){
        $scope.countySelection = getCountyData($scope, fips);
        console.log($scope.countySelection);
    };

}]);

//helper function to extract data from external JSON file
function getCountyData($scope, fips){
    for(var i = 0; i < $scope.countyData.properties.length; i++) {
        if ($scope.countyData.properties[i].FIPS === fips){
            return $scope.countyData.properties[i];
        }
    }
}

countyData

div的唯一输出是County元素的一对空

{}

countySelection.POP2000

为空

---

鉴于此布局，如何通过

单击事件

更新模板的作用域值？

解决方案是在单击处理程序中使用

$apply

：

function countyClickHandler(d, i, scope){
        scope.$apply(function(){
            scope.currentCounty(d.properties.fips);
        });
}

function countyClickHandler(d, i, scope){
        scope.$apply(function(){
            scope.currentCounty(d.properties.fips);
        });
}