使用地理定位创建一个显示我当前位置的按钮

Question

我想创建一个使用地理定位显示我当前位置的按钮。这是我从开发人员页面获取的代码。

<!DOCTYPE html>
<html>
  <head>
    <title>Geolocation</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }

    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>

    <script>
// Note: This example requires that you consent to location sharing when
// prompted by your browser. If you see a blank space instead of the map, this
// is probably because you have denied permission for location sharing.

var map;

function initialize() {
  var mapOptions = {
    zoom: 16
  };
  map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  // Try HTML5 geolocation
  if(navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
      var pos = new google.maps.LatLng(position.coords.latitude,
                                       position.coords.longitude);

      var infowindow = new google.maps.InfoWindow({
        map: map,
        position: pos,
        content: 'Location found using HTML5.'
      });

      map.setCenter(pos);
    }, function() {
      handleNoGeolocation(true);
    });
  } else {
    // Browser doesn't support Geolocation
    handleNoGeolocation(false);
  }

  var centerControlDiv = document.createElement('div');
  var centerControl = new CenterControl(centerControlDiv, map, chicago);

  centerControlDiv.index = 1;
  map.controls[google.maps.ControlPosition.BOTTOM_LEFT].push(centerControlDiv);

}

function handleNoGeolocation(errorFlag) {
  if (errorFlag) {
    var content = 'Error: The Geolocation service failed.';
  } else {
    var content = 'Error: Your browser doesn\'t support geolocation.';
  }

  var options = {
    map: map,
    position: new google.maps.LatLng(60, 105),
    content: content
  };

  var infowindow = new google.maps.InfoWindow(options);
  map.setCenter(options.position);


}






google.maps.event.addDomListener(window, 'load', initialize);




    </script>
  </head>
  <body>
    <div id="map-canvas"></div>



  </body>
</html>

我在这些论坛上发现 post 说要使用此代码：

var myloc = new google.maps.Marker({
    clickable: false,
    icon: new google.maps.MarkerImage('//maps.gstatic.com/mapfiles/mobile/mobileimgs2.png',
                                                    new google.maps.Size(22,22),
                                                    new google.maps.Point(0,18),
                                                    new google.maps.Point(11,11)),
    shadow: null,
    zIndex: 999,
    map: // your google.maps.Map object
});

if (navigator.geolocation) navigator.geolocation.getCurrentPosition(function(pos) {
    var me = new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude);
    myloc.setPosition(me);
}, function(error) {
    // ...
});

但它似乎对我不起作用。我不知道为什么。任何人都可以尝试向我解释并告诉我将代码放在哪里以使其正常工作吗？

我宁愿用一个"custom control"来显示我现在的位置，如果有人能帮我做一个这样的，这样我就可以把它放在任何我想放的地方。

Answer 1

这是一个简单示例，说明如何创建自定义控件并将点击事件侦听器绑定到地理定位 用户。

var map;

function initialize() {

    var mapOptions = {
        center: new google.maps.LatLng(10, 10),
        zoom: 5
    };

    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

    // Create the DIV to hold the control and call the constructor passing in this DIV
    var geolocationDiv = document.createElement('div');
    var geolocationControl = new GeolocationControl(geolocationDiv, map);

    map.controls[google.maps.ControlPosition.TOP_CENTER].push(geolocationDiv);
}

function GeolocationControl(controlDiv, map) {

    // Set CSS for the control button
    var controlUI = document.createElement('div');
    controlUI.style.backgroundColor = '#444';
    controlUI.style.borderStyle = 'solid';
    controlUI.style.borderWidth = '1px';
    controlUI.style.borderColor = 'white';
    controlUI.style.height = '28px';
    controlUI.style.marginTop = '5px';
    controlUI.style.cursor = 'pointer';
    controlUI.style.textAlign = 'center';
    controlUI.title = 'Click to center map on your location';
    controlDiv.appendChild(controlUI);

    // Set CSS for the control text
    var controlText = document.createElement('div');
    controlText.style.fontFamily = 'Arial,sans-serif';
    controlText.style.fontSize = '10px';
    controlText.style.color = 'white';
    controlText.style.paddingLeft = '10px';
    controlText.style.paddingRight = '10px';
    controlText.style.marginTop = '8px';
    controlText.innerHTML = 'Center map on your location';
    controlUI.appendChild(controlText);

    // Setup the click event listeners to geolocate user
    google.maps.event.addDomListener(controlUI, 'click', geolocate);
}

function geolocate() {

    if (navigator.geolocation) {

        navigator.geolocation.getCurrentPosition(function (position) {

            var pos = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);

            // Create a marker and center map on user location
            marker = new google.maps.Marker({
                position: pos,
                draggable: true,
                animation: google.maps.Animation.DROP,
                map: map
            });

            map.setCenter(pos);
        });
    }
}

initialize();

JSFiddle demo

使用地理定位创建一个显示我当前位置的按钮

Creating a button that shows my current location using geolocation

javascript

api

geolocation

google-maps-api-3