HTML5地理位置表是重新加载全图不仅位置 [英] HTML5 geolocation watchposition is reloading full map not only position

问题描述

我有一个代码，但问题是表位（）是重新映射完整的地图，不仅是位置，我想要的是当我缩放，即使位置发生变化，它也会将标记更改为该位置。

 < p id =demo>点击按钮以获取您的位置：< / p> 
 
< button onclick =getLocation（）>试试< / button> 
 
< div id =mapholder>< / div> 
 
< script src =http://maps.google.com/maps/api/js?sensor=false>< / script> 
 
< script> 
 var x = document.getElementById（demo）; 
函数getLocation（）{
 if（navigator.geolocation）{
 navigator.geolocation.watchPosition（showPosition，showError）; 
} else {
 x.innerHTML =此浏览器不支持地理定位。;} 
} 
 
函数showPosition（position）{
 lat = position.coords.latitude; 
 lon = position.coords.longitude; 
 latlon = new google.maps.LatLng（lat，lon）
 mapholder = document.getElementById（'mapholder'）
 mapholder.style.height ='250px'; 
 mapholder.style.width ='500px'; 
 
 var myOptions = {
 center：latlon，zoom：14，
 mapTypeId：google.maps.MapTypeId.ROADMAP，
 mapTypeControl：false，
 navigationControlOptions：{style：google.maps.NavigationControlStyle.SMALL} 
} 
 
 var map = new google.maps.Map（document.getElementById（mapholder），myOptions）; 
 var marker = new google.maps.Marker（{position：latlon，map：map，title：You are here！}）; 
} 
 
 function showError（error）{
 switch（error.code）{$ b $ case case.PERMISSION_DENIED：
 x.innerHTML =User denied地理位置请求。 
休息; 
 case error.POSITION_UNAVAILABLE：
 x.innerHTML =位置信息不可用。 
休息; 
 case error.TIMEOUT：
 x.innerHTML =请求获取用户位置超时。 
休息; 
 case error.UNKNOWN_ERROR：
 x.innerHTML =发生未知错误。 
休息; 
} 
} 
< / script> 
< / body> 
< / html> 
  

解决方案

这是因为您正在重新载入地图。你应该改变中心。

所以你应该修改你的代码有2个函数：

1- inizialize map。

 函数初始化（位置）{
 lat = position.coords.latitude; 
 lon = position.coords.longitude; 
 latlon = new google.maps.LatLng（lat，lon）
 mapholder = document.getElementById（'mapholder'）
 mapholder.style.height ='250px'; 
 mapholder.style.width ='500px'; 
 
 var myOptions = {
 center：latlon，zoom：14，
 mapTypeId：google.maps.MapTypeId.ROADMAP，
 mapTypeControl：false，
 navigationControlOptions：{style：google.maps.NavigationControlStyle.SMALL} 
} 
 
 var map = new google.maps.Map（document.getElementById（mapholder），myOptions）; 
 var marker = new google.maps.Marker（{position：latlon，map：map，title：You are here！}）; 
} 
  

2-改变焦点

 函数showPosition（position）{
 
 map.setCenter（position）; 
 
} 
  

I have a code but the problem is the watchposition() is relaoding the full map,not only the position,what i want is when i zoom even if position changes it will just change the marker to that position

<p id="demo">Click the button to get your position:</p>

<button onclick="getLocation()">Try It</button>

<div id="mapholder"></div>

<script src="http://maps.google.com/maps/api/js?sensor=false"></script>

<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
    navigator.geolocation.watchPosition(showPosition,showError);
} else { 
    x.innerHTML = "Geolocation is not supported by this browser.";}
}

 function showPosition(position) {
 lat = position.coords.latitude;
 lon = position.coords.longitude;
  latlon = new google.maps.LatLng(lat, lon)
 mapholder = document.getElementById('mapholder')
 mapholder.style.height='250px';
 mapholder.style.width='500px';

 var myOptions={
 center:latlon,zoom:14,
 mapTypeId:google.maps.MapTypeId.ROADMAP,
mapTypeControl:false,
navigationControlOptions:{style:google.maps.NavigationControlStyle.SMALL}
}

var map = new google.maps.Map(document.getElementById("mapholder"),myOptions);
var marker = new google.maps.Marker({position:latlon,map:map,title:"You are here!"});
 }

 function showError(error) {
switch(error.code) {
    case error.PERMISSION_DENIED:
        x.innerHTML = "User denied the request for Geolocation."
        break;
    case error.POSITION_UNAVAILABLE:
        x.innerHTML = "Location information is unavailable."
        break;
    case error.TIMEOUT:
        x.innerHTML = "The request to get user location timed out."
        break;
    case error.UNKNOWN_ERROR:
        x.innerHTML = "An unknown error occurred."
        break;
      }
     }
     </script>
    </body>
      </html>

解决方案

That's because you are reloading the map. You should change the center.

So you should modify your code to have 2 functions:

1- To inizialize the map.

     function initialize(position) {
       lat = position.coords.latitude;
       lon = position.coords.longitude;
       latlon = new google.maps.LatLng(lat, lon)
       mapholder = document.getElementById('mapholder')
       mapholder.style.height='250px';
       mapholder.style.width='500px';

       var myOptions={
        center:latlon,zoom:14,
        mapTypeId:google.maps.MapTypeId.ROADMAP,
        mapTypeControl:false,
        navigationControlOptions:{style:google.maps.NavigationControlStyle.SMALL}
     }

     var map = new google.maps.Map(document.getElementById("mapholder"),myOptions);
     var marker = new google.maps.Marker({position:latlon,map:map,title:"You are here!"});
}

2- To change the focus.

 function showPosition(position) {

  map.setCenter(position);

 }

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