Question

我正在尝试使用AngularJs和Google Maps API在地图上显示标记。但是，由于某种原因，我无法显示标记。我不确定我是否错误地从数据库中提取数据，但是如果有人可以帮我解决这个问题会很棒！

.controller('MapCtrl', ['$scope', '$state', '$cordovaGeolocation', '$ionicSideMenuDelegate', '$ionicModal', 'LocationService', function($scope, $state, $cordovaGeolocation, $ionicSideMenuDelegate, $ionicModal, LocationService) {
    $scope.locations = [];

    LocationService.getLocations().then(function (result) {
      $scope.locations = result.data;
    });

    var mapOptions = {
        zoom: 4,
        center: new google.maps.LatLng(40.0000, -98.0000),
        mapTypeId: google.maps.MapTypeId.ROADMAP
    }

    $scope.map = new google.maps.Map(document.getElementById('map'), mapOptions);

    $scope.markers = [];

    var infoWindow = new google.maps.InfoWindow();

    var createMarker = function (info){

        var marker = new google.maps.Marker({
            map: $scope.map,
            position: new google.maps.LatLng(info.lat, info.long),
            title: info.name
        });

        marker.content = '<div class="infoWindowContent">' + info.name + '</div>';

        google.maps.event.addListener(marker, 'click', function(){
            infoWindow.setContent('<h2>' + marker.title + '</h2>' + marker.content);
            infoWindow.open($scope.map, marker);
        });

        $scope.markers.push(marker);

    }  

    for (i = 0; i < $scope.locations.length; i++){
        createMarker($scope.locations[i]);
    }

    $scope.openInfoWindow = function(e, selectedMarker){
        e.preventDefault();
        google.maps.event.trigger(selectedMarker, 'click');
    }
}])

.service('LocationService', function ($http, Backand) {
  var baseUrl = '/1/objects/';
  var objectName = 'locations/';

  function getUrl() {
    return Backand.getApiUrl() + baseUrl + objectName;
  }

  function getUrlForId(id) {
    return getUrl() + id;
  }

  getLocations = function () {
    return $http.get(getUrl());
  };

  return {
    getLocations: getLocations
  }
})

数据如何存储在数据库中

{
     "id": 1,
      "name": "Ballentine Hall",
      "lat": 39.165935,
      "long": -86.521287
}

Answer 1

嗯，我得到了它的工作。很确定这不是正确/最有效的方法，但至少它的工作。

所以，我发现createMarker函数无法读取位置变量中存储的数据。为了解决这个问题，我只是将地图的所有代码放在从数据库获取位置数据的函数中。这解决了获取数据的问题。

第二个问题是它没有从这些位置获取正确的数据。因此，在getList函数中，我将代码更改为：$scope.locations = response.data.data;然后一切都开始工作了。

.controller('MapCtrl', ['$scope', '$state', '$cordovaGeolocation', '$ionicSideMenuDelegate', '$ionicModal', 'dataService', '$http', 'Backand', function($scope, $state, $cordovaGeolocation, $ionicSideMenuDelegate, $ionicModal, dataService, $http, Backand) {

  $scope.locations = [];

    dataService.getList('locations').then(function(response) {
    $scope.locations = response.data.data;

    var mapOptions = {
        zoom: 4,
        center: new google.maps.LatLng(40.0000, -98.0000),
        mapTypeId: google.maps.MapTypeId.ROADMAP
    }

    $scope.map = new google.maps.Map(document.getElementById('map'), mapOptions);

    $scope.markers = [];

    var infoWindow = new google.maps.InfoWindow();

    var createMarker = function (info){

        var marker = new google.maps.Marker({
            map: $scope.map,
            position: new google.maps.LatLng(info.lat, info.long),
            title: info.name
        });


        marker.content = '<div class="infoWindowContent">' + info.name + '</div>';

        google.maps.event.addListener(marker, 'click', function(){
            infoWindow.setContent('<h2>' + marker.title + '</h2>' + marker.content);
            infoWindow.open($scope.map, marker);
        });

        $scope.markers.push(marker);
    }  

 for (i = 0; i < $scope.locations.length; i++){
        createMarker($scope.locations[i]);
    }

    $scope.openInfoWindow = function(e, selectedMarker){
        e.preventDefault();
        google.maps.event.trigger(selectedMarker, 'click');
    } 
  });

Answer 2

您是否在调用createMarker函数时检查是否将数据输入$ scope.locations。使用console.log查看

 for (i = 0; i < $scope.locations.length; i++){
        console.log($scope.locations);
        createMarker($scope.locations[i]);
    }

由于javascript异步性质，它将转到下一行并执行程序，然后一旦你的promise解析它将绑定数据。

AngularJs和Google Maps问题：不显示标记？

2 个答案: