Google 地图下拉选择器显示信息窗口

Question

我创建了一个 Google 带有聚类标记的地图和一个显示每个位置的下拉菜单。这个想法是，当您 select 从下拉菜单中选择一个位置时，会显示信息窗口。

一切正常 - 除了最后一点。

当某个位置被 select 编辑时，我无法让 Select 下拉菜单显示信息窗口。

代码如下：

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=[API-KEY]&amp;callback=initMap&amp;language=en"></script>
<script src="../markerclustererplus@4.0.1.min.js"></script>

<script type="text/javascript">
var gmarkers = [];
var side_bar_html = "";

function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 1, lng: 1},
  zoom: 3,
    minZoom: 1, 
    maxZoom: 16,
    mapTypeControl: false,
    streetViewControl: false,
    scrollwheel: false
});
var infoWin = new google.maps.InfoWindow();
var markers = locations.map(function(location, i) {
var marker = new google.maps.Marker({
  position: location,
    icon: '../images/location-marker.png'
});
google.maps.event.addListener(marker, 'click', function(evt) {
  infoWin.setContent(location.info);
  infoWin.open(map, marker);
})
return marker;
});

var markerCluster = new MarkerClusterer(map, [], {
imagePath: '../images/m' 
});
markerCluster.setStyles(markerCluster.getStyles().map(function (style) {
style.textColor = '#fff';
return style;
}));
markerCluster.addMarkers(markers)
}

var locations = [
{
title: "Marker 1",
lat: 0,
lng:  0,
info: "Info Window 1"
},
{
title: "Marker 2",
lat: 0,
lng:  1,
info: "Info Window 2"
},
{
title: "Marker 3",
lat: 0,
lng:  2,
info: "Info Window 3"
},
{
title: "Marker 4",
lat: 1,
lng:  0,
info: "Info Window 4"
},
{
title: "Marker 5",
lat: 1,
lng:  1,
info: "Info Window 5"
},
{
title: "Marker 6",
lat: 1,
lng:  2,
info: "Info Window 6"
},
];

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

document.getElementById("side_bar").innerHTML = "<select onchange='myclick(this.value);' name=\"country\" class=\"wpcf7-form-control wpcf7-select form-control\" aria-invalid=\"false\"><option value=\"Please choose your country...\">Please choose your country...</option>"+side_bar_html+"</select>";

function addMarker(i) {
var draftMarker = locations[i];
var myLatLng = new google.maps.LatLng(draftMarker.lat, draftMarker.lng);
var marker = new google.maps.Marker({
    position: myLatLng,
    map: map,
    title: draftMarker.title,
    icon: '../images/location-marker.png'
});

google.maps.event.addListener(location, 'click', function () {
    info.setContent(draftMarker.info);
    info.open(map, location);
});
gmarkers.push(location);
side_bar_html += '<option value=' + (gmarkers.length-1) + '>' + draftMarker.title + '<\/option>';

return marker;
}

// This function picks up the click and opens the corresponding info window
function myclick(i) {
map.setCenter(gmarkers[i].getPosition());
google.maps.event.trigger(gmarkers[i], "click");
}

google.maps.event.addDomListener(window, "load", initMap);

</script>

在 Google Chrome

的控制台中查看时出现以下错误

Uncaught TypeError: gmarkers[i].getPosition is not a function

我尝试更改最后一位

function myclick(i) {
map.setCenter(gmarkers[i].getPosition());
google.maps.event.trigger(gmarkers[i], "click");
}

到

function myclick(i) {
var draftMarker = locations[I];
map.setCenter(new google.maps.LatLng(draftMarker.lat, draftMarker.lng));
google.maps.event.trigger(gmarkers[i], "click");
}

但是我得到了错误

Uncaught TypeError: map.setCenter is not a function

Answer 1

您的代码中存在多个问题。首先，确保始终考虑范围。您需要将一些变量设置为全局变量，以便在您未明确设置它们的函数中检索它们的值：

var infoWin;
var map;

这就是您收到“gmarkers[i].getPosition 不是函数”错误的原因。

然后，您将在 initMap 和 addMarker 中添加标记及其对应的点击事件监听器，但是当您点击它们时，您只会触发第一个事件监听器，即信息 windows 无法打开的另一个原因。您只需要在一个地方添加所有代码一次，例如在 addMarker。此外，当您应该推送实际标记实例时，您正在使用 gmarkers.push(location)，即 gmarkers.push(marker).

我已将您的 JS 代码修复如下：

var gmarkers = [];
var side_bar_html = "";
var infoWin;
var map;
var locations = [
  {
    title: "Marker 1",
    lat: 0,
    lng: 0,
    info: "Info Window 1"
  },
  {
    title: "Marker 2",
    lat: 0,
    lng: 1,
    info: "Info Window 2"
  },
  {
    title: "Marker 3",
    lat: 0,
    lng: 2,
    info: "Info Window 3"
  },
  {
    title: "Marker 4",
    lat: 1,
    lng: 0,
    info: "Info Window 4"
  },
  {
    title: "Marker 5",
    lat: 1,
    lng: 1,
    info: "Info Window 5"
  },
  {
    title: "Marker 6",
    lat: 1,
    lng: 2,
    info: "Info Window 6"
  }
];

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 10, lng: 10 },
    zoom: 3,
    minZoom: 1,
    maxZoom: 16,
    mapTypeControl: false,
    streetViewControl: false,
    scrollwheel: false
  });
  infoWin = new google.maps.InfoWindow();

  var markers = locations.map(function (location, i) {
    return addMarker(i);
  });

  // put the assembled side_bar_html contents into the side_bar div
  document.getElementById("side_bar").innerHTML =
    '<select onchange=\'myclick(this.value);\' name="country" class="wpcf7-form-control wpcf7-select form-control" aria-invalid="false"><option value="Please choose your country...">Please choose your country...</option>' +
    side_bar_html +
    "</select>";

  var markerCluster = new MarkerClusterer(map, [], {
    imagePath: "https://www.takagi-j.com/test/marker-clusterer-example/images/m"
  });
  markerCluster.setStyles(
    markerCluster.getStyles().map(function (style) {
      style.textColor = "#fff";
      return style;
    })
  );
  markerCluster.addMarkers(markers);
}

function addMarker(i) {
  infoWin = new google.maps.InfoWindow();
  var draftMarker = locations[i];
  var myLatLng = new google.maps.LatLng(draftMarker.lat, draftMarker.lng);
  var marker = new google.maps.Marker({
    position: myLatLng,
    map: map,
    title: draftMarker.title,
    icon:
      "https://www.takagi-j.com/test/marker-clusterer-example/images/location-marker.png"
  });
  google.maps.event.addListener(marker, "click", function (evt) {
    infoWin.setContent(draftMarker.info);
    infoWin.open(map, marker);
  });
  gmarkers.push(marker);
  side_bar_html +=
    "<option value=" +
    (gmarkers.length - 1) +
    ">" +
    draftMarker.title +
    "</option>";

  return marker;
}

// This function picks up the click and opens the corresponding info window
function myclick(i) {
  map.setCenter(gmarkers[i].getPosition());
  google.maps.event.trigger(gmarkers[i], "click");
}

google.maps.event.addDomListener(window, "load", initMap);

Google 地图下拉选择器显示信息窗口

Google Maps Dropdown Selector to show InfoWindow

javascript

google-maps

google-maps-api-3

google-maps-markers

markerclusterer