javascript - 单击另一个标记时，Google map 会关闭之前的信息窗口

Question

考虑以下位置:

 var locations =
        [{ "id": 1, "ReferenceNumber": "52525252525", "Address" : "School" , "Latitude": "21.585486", "Longitude": "50.258745" },
         { "id": 2, "ReferenceNumber": "6262626262", "Address" : "University", "Latitude": "21.54484411", "Longitude": "50.14846648" },
         { "id": 3, "ReferenceNumber": "424242424", "Address": "PUMPING STATION ", "Latitude": "21.9856341", "Longitude": "61.2587466" }];

使用以下代码，单击多个标记将打开多个信息窗口。如何防止这种情况发生并确保在打开新窗口之前关闭前一个信息窗口？

$.each(locations, function(i, item) {

    var marker = new google.maps.Marker({
        'position': new google.maps.LatLng(item.Latitude, item.Longitude),
        'map': map,
        'title': item.Latitude + "," + item.Longitude
    });

    marker.setIcon('http://maps.google.com/mapfiles/ms/icons/red-dot.png')

    var infowindow = new google.maps.InfoWindow({
        content: "<div class='infoDiv'><h3>Reference#: </h3> <h6>" + item.ReferenceNumber + "<h3>Location: </h3> <h6>" + item.Address + "</div></div>"
    });

    google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map, marker);
    });

    google.maps.event.addListener(map, "click", function(event) {
        infowindow.close();
        //autoCenter();
    });
})

任何帮助将不胜感激。

Answer 1

如果您只需要一次打开一个信息窗口，请不要创建多个信息窗口。您只需要 Infowindow 对象的一个​​实例，并使用 setContent() 方法根据您单击的标记设置其内容。

您还需要在标记单击监听器周围使用闭包。类似这样的事情:

google.maps.event.addListener(marker, 'click', (function(marker) {

  return function() {

    // Something here
  }

})(marker));

更多信息请点击:Using Closures in Event Listeners

下面的工作示例(使用 jQuery)

function initialize() {

  var mapOptions = {
    zoom: 5,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    center: new google.maps.LatLng(1, 1)
  };

  var locations = [
    [new google.maps.LatLng(0, 0), 'Marker 1', 'Infowindow content for Marker 1'],
    [new google.maps.LatLng(0, 1), 'Marker 2', 'Infowindow content for Marker 2'],
    [new google.maps.LatLng(0, 2), 'Marker 3', 'Infowindow content for Marker 3'],
    [new google.maps.LatLng(1, 0), 'Marker 4', 'Infowindow content for Marker 4'],
    [new google.maps.LatLng(1, 1), 'Marker 5', 'Infowindow content for Marker 5'],
    [new google.maps.LatLng(1, 2), 'Marker 6', 'Infowindow content for Marker 6']
  ];

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

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

  $.each(locations, function(i, item) {

    var marker = new google.maps.Marker({
      position: item[0],
      map: map,
      title: item[1],
    });

    google.maps.event.addListener(marker, 'click', (function(marker) {

      return function() {
        infowindow.setContent(item[2]);
        infowindow.open(map, marker);
      }

    })(marker));
  });

}

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

#map-canvas {
  height: 150px;
}

<div id="map-canvas"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?libraries=places&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>

这里是 Vanilla Javascript 中的相同解决方案(无 jQuery)

function initialize() {

    var mapOptions = {
        zoom: 5,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        center: new google.maps.LatLng(1, 1)
    };

    var locations = [
        [new google.maps.LatLng(0, 0), 'Marker 1', 'Infowindow content for Marker 1'],
        [new google.maps.LatLng(0, 1), 'Marker 2', 'Infowindow content for Marker 2'],
        [new google.maps.LatLng(0, 2), 'Marker 3', 'Infowindow content for Marker 3'],
        [new google.maps.LatLng(1, 0), 'Marker 4', 'Infowindow content for Marker 4'],
        [new google.maps.LatLng(1, 1), 'Marker 5', 'Infowindow content for Marker 5'],
        [new google.maps.LatLng(1, 2), 'Marker 6', 'Infowindow content for Marker 6']
    ];

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

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

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

        var marker = new google.maps.Marker({
            position: locations[i][0],
            map: map,
            title: locations[i][1]
        });

        google.maps.event.addListener(marker, 'click', (function (marker, i) {

            return function () {
                infowindow.setContent(locations[i][2]);
                infowindow.open(map, marker);
            }

        })(marker, i));
    }
}

initialize();

#map-canvas {
  height: 150px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=places&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>