范围不会将数据发送到html

Question

我给我的地图拉特和lon，但是在地图上它并不接受它。 有人可以帮忙吗？

图片1：

图片2：

这是控制器：

        angular.module('todoController', ['ngMap' , 'firebase'])

            // inject the Todo service factory into our controller
            .controller('mainController', ['$scope' , '$firebaseArray' , function($scope , $firebaseArray ,NgMap , $timeout ) {
         // check the ng-map docs for api url and api key       
        $scope.mapsApiUrl = 'AIzaSyA3ZMA6KlxboXRuA7ItNNSlJp3xcgjaB0M'; 
            $scope.$onInit = onInit;

函数onInit初始化地图

        function onInit() {
            NgMap.getMap().then(function (mapInstance) {
            var center = mapInstance.getCenter();

            google.maps.event.trigger(mapInstance, 'resize');
            mapInstance.setCenter(center);

            $timeout(function () {
                $scope.map = mapInstance;
            });
            }) ; }

firebase参考

               // CREATE A FIREBASE REFERENCE
                var config = {
                    apiKey: "AIzaSyAKoDxaWtWmvnDAvMBwddPeGt16gRPzALg",
                    authDomain: "trackeur-backend.firebaseapp.com",
                    databaseURL: "https://trackeur-backend.firebaseio.com",
                    projectId: "trackeur-backend",
                    storageBucket: "trackeur-backend.appspot.com",
                    messagingSenderId: "981610558503"
                };
                firebase.initializeApp(config);

这是运行应用程序的功能

         $scope.addTodo = function () {
                var lat = firebase.database().ref().child('coordinates').child('lat');
                var lon = firebase.database().ref().child('coordinates').child('lon');
                setInterval(() => {
                            lat.on("value", function(snapshot) {
                                    // This isn't going to show up in the DOM immediately, because
                                    // Angular does not know we have changed this in memory.
                                    // $scope.data = snapshot.val();
                                    // To fix this, we can use $scope.$apply() to notify Angular that a change occurred.
                                    $scope.$apply(function() {
                                    $scope.data = snapshot.val();
                                    });
                                });

                            lon.on("value", function(snapshot) {
                                    // This isn't going to show up in the DOM immediately, because
                                    // Angular does not know we have changed this in memory.
                                    // $scope.data = snapshot.val();
                                    // To fix this, we can use $scope.$apply() to notify Angular that a change occurred.
                                    $scope.$apply(function() {
                                    $scope.data1 = snapshot.val();
                                    });
                            });

                            // here I provide the latitude and longitude to my map 

                                console.log($scope.data  +' ,  '+ $scope.data1 ) ; 
                                $scope.coord ={
                                    lat: $scope.data , 
                                    lon: $scope.data1
                                } ; 


                            }, 1000);


                };

我的问题是我从firebase获得了纬度和经度但是当我将它们发送到我的HTML时它并没有标记我得到的坐标，实际上它根本没有移动，这里＆＃39;是标记：

<marker position="[{{$coord.lat}} , {{$coord.lon}}] " icon="car2.png"></marker>

Answer 1

最好在属性中仅使用一个双花括号，{{ }}，interpolation：

<marker position="{{'['+data+','+data1+']'}}"  icon="car2.png">
</marker>

这减少了模板中观察者的数量。

还使用已从异步块中应用的$scope个变量。