使用位置从W3C地理返回

问题描述：

function FindMyLocation(callback) { 
if (navigator.geolocation) { 

    var locationMarker = null; 
    if (locationMarker) { 
     return; 
    } 
    navigator.geolocation.getCurrentPosition(
     function(position){ 
      pos = new google.maps.LatLng(position.coords.latitude,position.coords.longitude); 
      map.setCenter(new google.maps.LatLng(position.coords.latitude,position.coords.longitude)); 
      addMarker(
      position.coords.latitude, 
      position.coords.longitude, 
      "You are here" 
      ); 
      setTimeout(function(window) { 
       callback.call(pos); 
      }, 1000); 
     }, 
     function (geoPositionError) { 
     switch (geoPositionError.code) { 
      case 0: 
       alert('An unknown error occurred, sorry'); 
       break; 
      case 1: 
       alert('Permission to use Geolocation was denied'); 
       break; 
      case 2: 
       alert('Couldn\'t find you...'); 
       break; 
      case 3: 
       alert('The Geolocation request took too long and timed out'); 
       break; 
      default: 
     } 
    }, 
    timeoutCallback, 10, {maximumAge:60000, timeout:50000, enableHighAccuracy:true} 
    ); 

var positionTimer = navigator.geolocation.watchPosition(
    function(position){ 
     updateMarker(
      locationMarker, 
      position.coords.latitude, 
      position.coords.longitude, 
      "Updated/Accurate Position" 
     ); 
    } 
); 
setTimeout(
    function(){ 
     // Clear the position watcher. 
     navigator.geolocation.clearWatch(positionTimer); 
    }, 
    (1000 * 60 * 5) 
); 

} else { 
    alert("Your phone browser doesn't support geolocation."); 
} 
} 
function timeoutCallback(){ 
    alert('Hi there! we are trying to locate you but you have not answered the security question yet.\n\nPlease choose "Share My Location" to enable us to find you.'); 
}

我有这样的代码我的网页中运行：

FindMyLocation(function() { 
myPos = this; 
});

当我CONSOLE.LOG回调里面myPos，我见价值。不过，我希望能够在此回调之外使用myPos来进行距离计算。现在，它不会工作。

请帮忙。

什么问题？ – David

@David：当我尝试提醒或console.log myPos（声明为全局）时，我得到未定义的值。有任何想法吗？对于这个问题，我在回调和JavaScript方面不够强大。 “ – Mina

”'但是，我希望能够在此回调之外使用myPos来进行距离计算。“为什么不在回调中计算距离？或者，如果您定期执行距离计算或响应某个事件，只需在计算之前测试是否定义了“myPos”（并且如果还没有设置，则显示一条消息，如“仍在获取位置...” ）。 – apsillers

答

    <script lang="JavaScript" type="text/javascript"> 
         $.post(window.baseUrl + 'includes/tagmap.php', 
           { name:"<?php echo $value->business_name; ?>", 
           x: "<?php echo $value->x; ?>", 
           y: "<?php echo $value->y; ?>", 
           action:"populate"}, function(data){ 
            var locdata = $.parseJSON(data);   
            function ShowMyLocation() { 
             FindMyLocation(function(myPos) { 
              myPos = this;                                  addMarker(locdata.x,locdata.y,locdata.name); 
             }) 
             FindMyLocation(); 
            } 
            ShowMyLocation();         
           });         
        </script>

使用位置从W3C地理返回

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