谷歌映射JS API v3 -简单多标记示例

谷歌Maps Api相当新。我有一个数据数组，我想循环遍历并在地图上绘制。看似相当简单，但我发现的所有多标记教程都相当复杂。

让我们以谷歌网站的数据数组为例:

var locations = [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

我只是想绘制所有这些点，并在单击时弹出一个infoWindow来显示名称。

当前回答

我想我将把这个放在这里，因为它似乎是那些开始使用谷歌地图API的一个流行的着陆点。在客户端呈现多个标记可能是许多映射应用程序性能下降的原因。很难进行基准测试、修复，在某些情况下甚至很难确定存在问题(由于浏览器实现的差异、客户端可用的硬件、移动设备等等)。

开始解决这个问题的最简单方法是使用标记集群解决方案。其基本思想是将地理上相似的位置分组，并显示点的数量。当用户放大地图时，这些组会展开，显示出下面的单个标记。

也许最简单的实现是markerclusterer库。基本实现如下(在库导入之后):

<script type="text/javascript">
  function initialize() {
    var center = new google.maps.LatLng(37.4419, -122.1419);

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 3,
      center: center,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var markers = [];
    for (var i = 0; i < 100; i++) {
      var location = yourData.location[i];
      var latLng = new google.maps.LatLng(location.latitude,
          location.longitude);
      var marker = new google.maps.Marker({
        position: latLng
      });
      markers.push(marker);
    }
    var markerCluster = new MarkerClusterer({map, markers});
  }
  google.maps.event.addDomListener(window, 'load', initialize);
</script>

标记不是直接添加到映射中，而是添加到数组中。然后将该数组传递给为您处理复杂计算的库，并将其附加到映射。

这些实现不仅极大地提高了客户端性能，而且在许多情况下，它们还会导致更简单、更整洁的UI，更容易在更大范围内消化数据。

谷歌提供了其他实现。

希望这能帮助到那些刚接触映射的人。

2014-01-29 12:02:32

其他回答

根据Daniel Vassallo的回答，下面是一个以更简单的方式处理闭包问题的版本。

因为所有的标记都有一个单独的InfoWindow，而且JavaScript并不关心你是否给对象添加了额外的属性，你所需要做的就是给标记的属性添加一个InfoWindow，然后调用InfoWindow本身的.open() !

编辑:有了足够的数据，页面加载可能会花费很多时间，因此与其使用标记构造InfoWindow，不如只在需要时进行构造。注意，用于构造InfoWindow的任何数据都必须作为属性(data)追加到Marker。还要注意，在第一次单击事件之后，infoWindow将作为它的标记的属性持久化，因此浏览器不需要不断地重构。

var locations = [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

var map = new google.maps.Map(document.getElementById('map'), {
  center: new google.maps.LatLng(-33.92, 151.25)
});

for (i = 0; i < locations.length; i++) {  
  marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    map: map,
    data: {
      name: locations[i][0]
    }
  });
  marker.addListener('click', function() {
    if(!this.infoWindow) {
      this.infoWindow = new google.maps.InfoWindow({
        content: this.data.name;
      });
    }
    this.infoWindow.open(map,this);
  })
}

2016-06-30 03:00:38

var arr = new Array();
    function initialize() { 
        var i;  
        var Locations = [
                {
                  lat:48.856614, 
                  lon:2.3522219000000177, 
                  address:'Paris',
                  gval:'25.5',
                  aType:'Non-Commodity',
                  title:'Paris',
                  descr:'Paris'           
                },        
                    {
                  lat: 55.7512419, 
                  lon: 37.6184217,
                  address:'Moscow',
                  gval:'11.5',
                  aType:'Non-Commodity',
                  title:'Moscow',
                  descr:'Moscow Airport'              
                },     

                {
              lat:-9.481553000000002, 
              lon:147.190242, 
              address:'Port Moresby',
              gval:'1',
              aType:'Oil',
              title:'Papua New Guinea',
              descr:'Papua New Guinea 123123123'              
            },
            {
           lat:20.5200,
           lon:77.7500,
           address:'Indore',
            gval:'1',
            aType:'Oil',
            title:'Indore, India',
            descr:'Airport India'
        }
    ];

    var myOptions = {
        zoom: 2,
        center: new google.maps.LatLng(51.9000,8.4731),
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    var map = new google.maps.Map(document.getElementById("map"), myOptions);

    var infowindow =  new google.maps.InfoWindow({
        content: ''
    });

    for (i = 0; i < Locations.length; i++) {
            size=15;        
            var img=new google.maps.MarkerImage('marker.png',           
                new google.maps.Size(size, size),
                new google.maps.Point(0,0),
                new google.maps.Point(size/2, size/2)
           );

        var marker = new google.maps.Marker({
            map: map,
            title: Locations[i].title,
            position: new google.maps.LatLng(Locations[i].lat, Locations[i].lon),           
                icon: img
        });

        bindInfoWindow(marker, map, infowindow, "<p>" + Locations[i].descr + "</p>",Locations[i].title);  

    }

}

function bindInfoWindow(marker, map, infowindow, html, Ltitle) { 
    google.maps.event.addListener(marker, 'mouseover', function() {
            infowindow.setContent(html); 
            infowindow.open(map, marker); 

    });
    google.maps.event.addListener(marker, 'mouseout', function() {
        infowindow.close();

    }); 
}

完整的工作示例。你可以复制，粘贴和使用。

2013-10-17 07:14:24

异步版本:

<script type="text/javascript">
  function initialize() {
    var locations = [
      ['Bondi Beach', -33.890542, 151.274856, 4],
      ['Coogee Beach', -33.923036, 151.259052, 5],
      ['Cronulla Beach', -34.028249, 151.157507, 3],
      ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
      ['Maroubra Beach', -33.950198, 151.259302, 1]
    ];

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 10,
      center: new google.maps.LatLng(-33.92, 151.25),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var infowindow = new google.maps.InfoWindow();

    var marker, i;

    for (i = 0; i < locations.length; i++) {  
      marker = new google.maps.Marker({
        position: new google.maps.LatLng(locations[i][1], locations[i][2]),
        map: map
      });

      google.maps.event.addListener(marker, 'click', (function(marker, i) {
        return function() {
          infowindow.setContent(locations[i][0]);
          infowindow.open(map, marker);
        }
      })(marker, i));
    }
}

function loadScript() {
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = 'https://maps.googleapis.com/maps/api/js?v=3.exp&' +
      'callback=initialize';
  document.body.appendChild(script);
}

window.onload = loadScript;
  </script>

2014-06-06 12:58:16

在程序中添加标记非常简单。你只需要添加以下代码:

var marker = new google.maps.Marker({
  position: myLatLng,
  map: map,
  title: 'Hello World!'
});

当你构造一个标记时，下面的字段是特别重要和经常设置的:

position(必选)指定标识标记初始位置的LatLng。检索LatLng的一种方法是使用地理编码服务。 map(可选)指定放置标记的map。如果在构建标记时没有指定映射，则会创建标记，但不会附加到(或显示在)映射上。稍后可以通过调用标记的setMap()方法添加标记。

注意，在本例中，标题字段设置了将作为工具提示显示的标记标题。

您可以在这里查阅谷歌api文档。

这是在地图中设置一个标记的完整示例。注意，你必须用你的谷歌API密钥替换YOUR_API_KEY:

<!DOCTYPE html>
<html>
<head>
   <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
   <meta charset="utf-8">
   <title>Simple markers</title>
<style>
  /* Always set the map height explicitly to define the size of the div
   * element that contains the map. */
  #map {
    height: 100%;
  }
  /* Optional: Makes the sample page fill the window. */
  html, body {
    height: 100%;
    margin: 0;
    padding: 0;
  }
</style>
</head>
<body>
 <div id="map"></div>
<script>

  function initMap() {
    var myLatLng = {lat: -25.363, lng: 131.044};

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 4,
      center: myLatLng
    });

    var marker = new google.maps.Marker({
      position: myLatLng,
      map: map,
      title: 'Hello World!'
    });
  }
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>

现在，如果你想在map中绘制数组的标记，你应该这样做:

var locations = [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

function initMap() {
  var myLatLng = {lat: -33.90, lng: 151.16};

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 10,
    center: myLatLng
    });

  var count;

  for (count = 0; count < locations.length; count++) {  
    new google.maps.Marker({
      position: new google.maps.LatLng(locations[count][1], locations[count][2]),
      map: map,
      title: locations[count][0]
      });
   }
}

这个例子给出了如下结果:

你也可以在你的pin中添加一个infoWindow。你只需要这段代码:

var marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[count][1], locations[count][2]),
    map: map
    });

marker.info = new google.maps.InfoWindow({
    content: 'Hello World!'
    });

你可以在这里找到谷歌关于infoWindows的文档。

现在，我们可以在标记像这样“点击”时打开infoWindow:

var marker = new google.maps.Marker({
     position: new google.maps.LatLng(locations[count][1], locations[count][2]),
     map: map
     });

marker.info = new google.maps.InfoWindow({
     content: locations [count][0]
     });


google.maps.event.addListener(marker, 'click', function() {  
    // this = marker
    var marker_map = this.getMap();
    this.info.open(marker_map, this);
    // Note: If you call open() without passing a marker, the InfoWindow will use the position specified upon construction through the InfoWindowOptions object literal.
            });

注意，您可以在谷歌developer中获得一些关于Listener的文档。

最后，如果用户点击它，我们可以在标记中绘制一个infoWindow。这是我的完整代码:

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Info windows</title>
    <style>
    /* Always set the map height explicitly to define the size of the div
    * element that contains the map. */
    #map {
        height: 100%;
    }
    /* Optional: Makes the sample page fill the window. */
    html, body {
        height: 100%;
        margin: 0;
        padding: 0;
    }
    </style>
</head>
<body>
    <div id="map"></div>
    <script>

    var locations = [
        ['Bondi Beach', -33.890542, 151.274856, 4],
        ['Coogee Beach', -33.923036, 151.259052, 5],
        ['Cronulla Beach', -34.028249, 151.157507, 3],
        ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
        ['Maroubra Beach', -33.950198, 151.259302, 1]
    ];


    // When the user clicks the marker, an info window opens.

    function initMap() {
        var myLatLng = {lat: -33.90, lng: 151.16};

        var map = new google.maps.Map(document.getElementById('map'), {
            zoom: 10,
            center: myLatLng
            });

        var count=0;


        for (count = 0; count < locations.length; count++) {  

            var marker = new google.maps.Marker({
                position: new google.maps.LatLng(locations[count][1], locations[count][2]),
                map: map
                });

            marker.info = new google.maps.InfoWindow({
                content: locations [count][0]
                });


            google.maps.event.addListener(marker, 'click', function() {  
                // this = marker
                var marker_map = this.getMap();
                this.info.open(marker_map, this);
                // Note: If you call open() without passing a marker, the InfoWindow will use the position specified upon construction through the InfoWindowOptions object literal.
                });
        }
    }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
</body>
</html>

通常，你会得到这样的结果:

2017-04-12 05:54:33