我为什么在尝试访问我的嵌入谷歌地图时无法读取未定义的属性“getCenter”?

时间:2016-01-24 17:27:37

标签: javascript angularjs google-maps google-maps-api-3

这是我在我的网页上构建谷歌地图的方式:

var initialize = function(latitude, longitude, boundaries) {

            // Uses the selected lat, long as starting point
            var myLatLng = {lat: selectedLat, lng: selectedLong};

            // If map has not been created...
            if (!map){
                // Create a new map and place in the index.html page
                var map = new google.maps.Map(document.getElementById('map'), {
                    zoom: 12,
                    center: myLatLng
                });
            }

            if(boundaries.length > 0){
                //we don't have a permission for using real GPS of the user
                var bounds = new google.maps.LatLngBounds(
                    new google.maps.LatLng(boundaries[0], boundaries[1]),
                    new google.maps.LatLng(boundaries[2], boundaries[3]) );

                map.fitBounds(bounds);
            }else{
                //we have a permission, let's mark his location with a marker
                // Set initial location as a bouncing red marker
                var initialLocation = new google.maps.LatLng(latitude, longitude);

                var marker = new google.maps.Marker({
                    position: initialLocation,
                    animation: google.maps.Animation.BOUNCE,
                    map: map,
                    icon: 'http://www.google.com/mapfiles/dd-start.png'//'http://maps.google.com/mapfiles/ms/icons/red-dot.png'
                });
                //lastMarker = marker;

            }


            refreshDataOnMap(longitude, latitude, map);

正如您所见,我尝试将创建的地图传递给refreshDataOnMap方法:

   var refreshDataOnMap = function(long, lat, mymap) {

        console.log("refresh!!");
        var calculatedDistance = calculateRadiusInMiles(mymap);
   }

此方法调用calculateRadiusInMiles

// get the viewable map radius
        var calculateRadiusInMiles = function(map){

            var bounds = map.getBounds();

            var center = bounds.getCenter();
            var ne = bounds.getNorthEast();

            // r = radius of the earth in statute miles
            var r = 3963.0;

            // Convert lat or lng from decimal degrees into radians (divide by 57.2958)
            var lat1 = center.lat() / 57.2958;
            var lon1 = center.lng() / 57.2958;
            var lat2 = ne.lat() / 57.2958;
            var lon2 = ne.lng() / 57.2958;

            // distance = circle radius from center to Northeast corner of bounds
            var dis = r * Math.acos(Math.sin(lat1) * Math.sin(lat2) +
                    Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1));
            return dis;
        };

我的控制台中的结果显示:

  

刷新!!

     

angular.js:12520 TypeError:无法读取属性'getCenter'   未定义       在calculateRadiusInMiles(gservice.js:112)       在refreshDataOnMap(gservice.js:48)       初始化时(gservice.js:214)       在Object.googleMapService.refresh(gservice.js:36)       在对象。 (gservice.js:225)       at Object.invoke(angular.js:4523)       at Object.enforcedReturnValue [as $ get](angular.js:4375)       at Object.invoke(angular.js:4523)       在angular.js:4340       在getService(angular.js:4482)(匿名函数)@ angular.js:12520(匿名函数)@ angular.js:9292Scope。$ apply @   angular.js:16157bootstrapApply @ angular.js:1679invoke @   angular.js:4523doBootstrap @ angular.js:1677bootstrap @   angular.js:1697angularInit @ angular.js:1591(匿名函数)@   angular.js:29013fire @ jquery.js:3182self.fireWith @   jquery.js:3312jQuery.extend.ready @ jquery.js:3531completed @   的jquery.js:3547

     

刷新!!

因此我无法正确使用我页面上的地图。我不知道这里可能有什么问题,对我而言,在我尝试调用其属性之后看起来地图加载了,但是 - 如果这是正确的 - 我该如何防止它?

由于

EDIT ===========

这里有一个细节,因为它可能有助于调试此问题:

我加载谷歌地图并根据用户的IP地址居中,但是当浏览器检测到gps数据时,地图会重新加载并指向特定的gps点。这就是为什么在我的console.log中你可以看到refresh!!!两次

1 个答案:

答案 0 :(得分:0)

必须是bounds未定义,因此map尚未生效。您是否已将map传递给calculateRadiusInMiles()?你检查过bounds了吗?地图已经加载了吗?

Google Maps Api v3 - getBounds is undefined

编辑勺子:

看起来v3中的事件确实如此:

`google.maps.event.addListener(map, 'bounds_changed', function() {
     alert(map.getBounds());
});

`google.maps.event.addListener(map, 'idle', function() {
     alert(map.getBounds());
});