AngularJS，传单。如何从第三方服务动态获取纬度和经度坐标？

Question

我有一个简单的应用程序，它通过纬度和经度坐标显示您的当前位置并显示在地图上。但目前它是静态的，必须手动指定坐标。应用的完整代码：

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <link rel="stylesheet" type="text/css" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css" />
    <link rel="stylesheet" type="text/css" href="css/main.css">
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-leaflet-directive/0.10.0/angular-leaflet-directive.min.js"></script>
    <script src="https://code.angularjs.org/1.2.28/angular-route.min.js"></script>
    <script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script>
</head>
    <body ng-app="NearMeApp">

        <div class="header">
            <div class="container-fluid">
                <h1 class="pull-left">NearMe</h1>
                <a class="pull-right" href="#/about">About</a>
            </div>
        </div>

        <div ng-view></div>

        <script src="js/app.js"></script>

        <script src="js/controllers/MainController.js"></script>
        <script src="js/controllers/AboutController.js"></script>

    </body>
</html>

main.css 在 pasteBin

main.html

<div class="main">
    <div class="container-fluid" id="map-canvas">
        <leaflet center="mapCenter"></leaflet>
    </div>
</div>

about.html

<div class="about">
    <div class="container-fluid">
        <h1>Meet NearMe</h1>
        <h2>The best place to discover new places around you.</h2>
        <a class="btn btn-primary" href="#/">Start exploring</a>
    </div>
</div>

app.js

var app = angular.module('NearMeApp', ['ngRoute', 'leaflet-directive']);

app.config(function($routeProvider) {
    $routeProvider
    .when('/', {
        controller: 'MainController',
        templateUrl: 'views/main.html'
    })
    .when('/about', {
        controller: 'AboutController',
        templateUrl: 'views/about.html'
    })
    .otherwise({
        redirectTo: '/'
    });

});

AboutController.js

app.controller('AboutController', ['$scope', function($scope) {

}]);

MainController.js

app.controller('MainController', ['$scope', function($scope) {

    $scope.mapCenter = {
        lat: 40.741934,
        lng: -74.004897,
        zoom: 17
    };

}]);

如何从第三方服务动态获取纬度和经度？例如，来自 JSON IP API

听说可以通过某种方式获取JSON数据

app.factory('latlon', ['$http', function($http) {
    return $http.get('http://ip-api.com/json')
        .success(function(data) {
            return data;
        })
        .error(function(err) {
            return err;
        });
}]);

但我不知道在我的情况下该做什么以及如何使用它。你能帮我解决这个问题吗？

已解决

问题已解决

MainController.js

app.controller('MainController', ['$scope', '$http', function($scope, $http) {
    $scope.mapCenter = {};
    $http.get('http://ip-api.com/json')
        .success(function(data) {

            $scope.mapCenter.lat = data.lat;
            $scope.mapCenter.lng = data.lon;
            $scope.mapCenter.zoom = 17;

        });
}]);

Answer 1

不太确定“我如何确保数据（纬度和经度）是动态的”是什么意思，但您可以利用 HTML5 geolocation功能：navigator.geolocation.getCurrentPosition(success[, error[, options]])

您应该将其抽象为一个单独的服务或工厂，以使其更易于重用并避免对 window

的依赖

angular.module('app', []).factory('GeolocationService', ['$q', '$window', function ($q, $window) {

    function getPosition() {
      var deferred = $q.defer();

      if (!$window.navigator.geolocation) { // check if geolocation is supported
        deferred.reject('Geolocation is not supported.');
        return;
    }

    $window.navigator.geolocation.getCurrentPosition( // get the current position 
        function (position) { // ok
            deferred.resolve(position);
        },
        function (err) { // error
            deferred.reject(err);
        });

    return deferred.promise; // returned as a promise
  }

  return {
    getCurrentPosition: getCurrentPosition
  };
}]);

然后你可以像这样从你的控制器调用它

geolocationSvc.getPosition().then(
   function success(position){
     $scope.mapCenter = {
      lat: pos.coords.latitude,
      lng: pos.coords.longitude,
      zoom: 17      
}, 
function error(err){
  console.log('ERROR(' + err.code + '): ' + err.message);
});

请注意，此代码尚未经过实际测试，但应为您提供有关如何实施的概要。

AngularJS，传单。如何从第三方服务动态获取纬度和经度坐标？

AngularJS, Leaflet. How can I get lat and lon coordinates dynamically from a third-party service?

javascript

json

geolocation

angularjs

leaflet

已解决