How can I use HTML5 geolocation in angularjs

问题:

How can I use HTML5 geolocation in angularjs? I can get it using HTML5; but how can I pass it to angularjs scope in controller? any sample jsfiddle will save my day!

回答1:

you can do something

myApp.controller('fooCtrl', function($scope){
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position){
      $scope.$apply(function(){
        $scope.position = position;
      });
    });
  }
})

you need to do $scope.$apply to trigger the digest cycle when the geolocation arrives and to update all the watchers.

回答2:

I'd suggest abstracting this into a service so your controller doesn't have a dependency on window.navigator, and to avoid the unnecessary use of $scope.$apply(). Here's what I'm using in my project:

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

    'use strict';

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

        if (!$window.navigator.geolocation) {
            deferred.reject('Geolocation not supported.');
        } else {
            $window.navigator.geolocation.getCurrentPosition(
                function (position) {
                    deferred.resolve(position);
                },
                function (err) {
                    deferred.reject(err);
                });
        }

        return deferred.promise;
    }

    return {
        getCurrentPosition: getCurrentPosition
    };
}]);

Then I consume it in my controller like this:

function captureUserLocation() {
    geolocationSvc.getCurrentPosition().then(onUserLocationFound);
}

回答3:

You can use ngGeolocation. It is simple and does the job.

angular.module('appName', ['ngGeolocation'])
    .controller('appCtrl', function($scope, $geolocation) {
         $geolocation.getCurrentPosition().then(function(position) {
            console.log(position, 'current position');
         });
    });

回答4:

Due to firefox's issue not getting feedback from user on prompting that website needs to access your location when user clicking "Not now", X or outside prompt box (more here), below is a tiny example to trigger fallback action for this case. Plunker

// GeoLocationService
angular.module('myApp').factory('GeoLocationService', function($q, $window, $timeout) {
    var factoryObj = {};

    factoryObj.getPosition = function() {
        var deferred;
        var promiseTimeout = $timeout(function() {
            deferred.reject(1); // return 1 if browser waited for user input for more than timeout delay
        }, 3000);

        deferred = $q.defer();

        if(!$window.navigator.geolocation) { // check if geoLocation is not supported by browser
            $timeout.cancel(promiseTimeout);
            deferred.reject(false); // return false if geoLocation is not supported
        }
        else { // geoLocation is supported
            $window.navigator.geolocation.getCurrentPosition(function(position) {
                $timeout.cancel(promiseTimeout);
                return deferred.resolve(position);
            }, function(error) {
                $timeout.cancel(promiseTimeout);
                return deferred.reject(error.code || 1);
            });
        }

        return deferred.promise;
    };

    return factoryObj;
});

And your app js.

// App
var app = angular.module('myApp', []).controller('myCtrl', function($scope, $log, GeoLocationService) {
    $scope.position = {};

    GeoLocationService.getPosition().then(
        function(position) { // 
            $scope.position = position;
            $log.debug(position);
        },
        function(errorCode) {
            if(errorCode === false) {
                alert('GeoLocation is not supported by browser.');
            }
            else if(errorCode == 1) {
                alert('User either denied GeoLocation or waited for long to respond.');
            }
        }
    );
});