6

我有以下功能可以检查浏览器是否支持地理位置，然后获取用户的地理位置并将其放在地图上。

我需要添加什么才能让我从用户的地理位置向用户提供指向固定位置（这不会改变）的方向？

if (navigator.geolocation)
{
  navigator.geolocation.getCurrentPosition(function(position)
  {                                                              
    var latitude = position.coords.latitude;                    
    var longitude = position.coords.longitude;                 
    var coords = new google.maps.LatLng(latitude, longitude);
    var directionsDisplay;
    var directionsService = new google.maps.DirectionsService();
    var mapOptions = 
    {
      zoom: 15,  
      center: coords, 
      mapTypeControl: true, 
      navigationControlOptions:
      {
        style: google.maps.NavigationControlStyle.SMALL
      },
       mapTypeId: google.maps.MapTypeId.ROADMAP
    };
     map = new google.maps.Map(document.getElementById("mapContainer"), mapOptions);
     var marker = new google.maps.Marker( 
       {
         position: coords, 
         map: map,                 
        });
   });
}
else
{
   alert("Geolocation API is not supported in your browser.");

我已将此功能添加到我的代码中：

  function calcRoute() {
    var start = position;
    var end = "London";
    var request = {
      origin: start,
      destination: end,
      travelMode: google.maps.TravelMode.DRIVING
    };
    directionsService.route(request, function (result, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        directionsDisplay.setDirections(result);
      }
    });
  }

HTML： <div id="mapContainer" onload="calcRoute()"></div>

但它似乎仍然没有工作。

4

2 回答 2

12

让它使用以下代码：

if (navigator.geolocation) { //Checks if browser supports geolocation
   navigator.geolocation.getCurrentPosition(function (position) {                                                              //This gets the
     var latitude = position.coords.latitude;                    //users current
     var longitude = position.coords.longitude;                 //location
     var coords = new google.maps.LatLng(latitude, longitude); //Creates variable for map coordinates
     var directionsService = new google.maps.DirectionsService();
     var directionsDisplay = new google.maps.DirectionsRenderer();
     var mapOptions = //Sets map options
     {
       zoom: 15,  //Sets zoom level (0-21)
       center: coords, //zoom in on users location
       mapTypeControl: true, //allows you to select map type eg. map or satellite
       navigationControlOptions:
       {
         style: google.maps.NavigationControlStyle.SMALL //sets map controls size eg. zoom
       },
       mapTypeId: google.maps.MapTypeId.ROADMAP //sets type of map Options:ROADMAP, SATELLITE, HYBRID, TERRIAN
     };
     map = new google.maps.Map( /*creates Map variable*/ document.getElementById("map"), mapOptions /*Creates a new map using the passed optional parameters in the mapOptions parameter.*/);
     directionsDisplay.setMap(map);
     directionsDisplay.setPanel(document.getElementById('panel'));
     var request = {
       origin: coords,
       destination: 'BT42 1FL',
       travelMode: google.maps.DirectionsTravelMode.DRIVING
     };

     directionsService.route(request, function (response, status) {
       if (status == google.maps.DirectionsStatus.OK) {
         directionsDisplay.setDirections(response);
       }
     });
   });
 }
于 2013-02-02T15:54:45.547 回答
0

获得 后position，使用方向服务在地图上呈现方向。

您可以在此处找到示例代码 - https://developers.google.com/maps/documentation/javascript/directions#DisplayingResults

于 2013-01-29T17:50:20.517 回答