我有一个谷歌地图，使用市政当局的json文件：
的javascript：
var infoWindow = new google.maps.InfoWindow();
map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
map.data.loadGeoJson('js/neighborhoods_geojson2.json');
json看起来像这样：
{
"type": "FeatureCollection",
"features": [
{
{
"type": "Feature",
"properties": {
"name": "muniname",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 50,
"population": "1,785",
"beds": "20", "bedsratio": "11.20"
},
"geometry": {
"type": "MultiPolygon",
"coordinates": [
(coordinate pairs go here)
]
}
},
(next municipality)
]
}
我希望能够将鼠标移到市政当局并获得信息。但是如何识别市政府的坐标？
map.data.addListener('mouseover', function (e) {
var thisMuni = e.feature.geometry.getProperty('coordinates'); //doesn't work
strContent = "<h2>" + e.feature.getProperty('name') + "</h2>\
<table>\
<tr><td>Population</td><td class='population'>" + e.feature.getProperty('population') + "</td></tr>\
<tr><td>Beds</td><td class='beds'>" + e.feature.getProperty('beds') + "</td></tr>\
<tr><td>Beds per 1000</td><td class='bedsratio'>" + e.feature.getProperty('bedsratio') + "</td></tr>\
</table>";
infoWindow.open(map, this); //infowindow doesn't pop up on municipality
});
如何识别地图上的市政当局，以便我可以在其上弹出信息窗口？
答案 0 :(得分：1)
如果您没有在marker上打开信息窗口，则无法使用第二个参数打开，您必须自己设置信息窗口的位置。
map.data.addListener('mouseover', function (e) {
var strContent = "<h2>" + e.feature.getProperty('name') + "</h2>\
<table>\
<tr><td>Population</td><td class='population'>" + e.feature.getProperty('population') + "</td></tr>\
<tr><td>Beds</td><td class='beds'>" + e.feature.getProperty('beds') + "</td></tr>\
<tr><td>Beds per 1000</td><td class='bedsratio'>" + e.feature.getProperty('bedsratio') + "</td></tr>\
</table>";
infoWindow.setPosition(e.latLng);
infoWindow.setContent(strContent);
infoWindow.open(map);
});
代码段
var map;
var infoWindow = new google.maps.InfoWindow();
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {
lat: -28,
lng: 137
}
});
// Load GeoJSON.
map.data.addGeoJson(googleJson);
// [START snippet]
// Color each letter gray. Change the color when the isColorful property
// is set to true.
map.data.setStyle(function(feature) {
var color = 'gray';
if (feature.getProperty('isColorful')) {
color = feature.getProperty('color');
}
return /** @type {google.maps.Data.StyleOptions} */ ({
fillColor: color,
strokeColor: color,
strokeWeight: 2
});
});
// When the user clicks, set 'isColorful', changing the color of the letters.
map.data.addListener('click', function(event) {
event.feature.setProperty('isColorful', true);
});
// When the user hovers, tempt them to click by outlining the letters.
// Call revertStyle() to remove all overrides. This will use the style rules
// defined in the function passed to setStyle()
map.data.addListener('mouseover', function(event) {
map.data.revertStyle();
map.data.overrideStyle(event.feature, {
strokeWeight: 8
});
});
map.data.addListener('mouseover', function(e) {
var strContent = "<h2>" + e.feature.getProperty('name') + "</h2>\
<table>\
<tr><td>Population</td><td class='population'>" + e.feature.getProperty('population') + "</td></tr>\
<tr><td>Beds</td><td class='beds'>" + e.feature.getProperty('beds') + "</td></tr>\
<tr><td>Beds per 1000</td><td class='bedsratio'>" + e.feature.getProperty('bedsratio') + "</td></tr>\
</table>";
infoWindow.setPosition(e.latLng);
infoWindow.setContent(strContent);
infoWindow.open(map);
});
map.data.addListener('mouseout', function(event) {
map.data.revertStyle();
});
// [END snippet]
}
google.maps.event.addDomListener(window, "load", initMap);
var googleJson = {
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"properties": {
"letter": "G",
"color": "blue",
"rank": "7",
"ascii": "71",
"name": "muniname",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 50,
"population": "2,500",
"beds": "25",
"bedsratio": "11.20"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[123.61, -22.14],
[122.38, -21.73],
[121.06, -21.69],
[119.66, -22.22],
[119.00, -23.40],
[118.65, -24.76],
[118.43, -26.07],
[118.78, -27.56],
[119.22, -28.57],
[120.23, -29.49],
[121.77, -29.87],
[123.57, -29.64],
[124.45, -29.03],
[124.71, -27.95],
[124.80, -26.70],
[124.80, -25.60],
[123.61, -25.64],
[122.56, -25.64],
[121.72, -25.72],
[121.81, -26.62],
[121.86, -26.98],
[122.60, -26.90],
[123.57, -27.05],
[123.57, -27.68],
[123.35, -28.18],
[122.51, -28.38],
[121.77, -28.26],
[121.02, -27.91],
[120.49, -27.21],
[120.14, -26.50],
[120.10, -25.64],
[120.27, -24.52],
[120.67, -23.68],
[121.72, -23.32],
[122.43, -23.48],
[123.04, -24.04],
[124.54, -24.28],
[124.58, -23.20],
[123.61, -22.14]
]
]
}
}, {
"type": "Feature",
"properties": {
"letter": "o",
"color": "red",
"rank": "15",
"ascii": "111",
"name": "muniname1",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 51,
"population": "3,000",
"beds": "23",
"bedsratio": "11.22"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[128.84, -25.76],
[128.18, -25.60],
[127.96, -25.52],
[127.88, -25.52],
[127.70, -25.60],
[127.26, -25.79],
[126.60, -26.11],
[126.16, -26.78],
[126.12, -27.68],
[126.21, -28.42],
[126.69, -29.49],
[127.74, -29.80],
[128.80, -29.72],
[129.41, -29.03],
[129.72, -27.95],
[129.68, -27.21],
[129.33, -26.23],
[128.84, -25.76]
],
[
[128.45, -27.44],
[128.32, -26.94],
[127.70, -26.82],
[127.35, -27.05],
[127.17, -27.80],
[127.57, -28.22],
[128.10, -28.42],
[128.49, -27.80],
[128.45, -27.44]
]
]
}
}, {
"type": "Feature",
"properties": {
"letter": "o",
"color": "yellow",
"rank": "15",
"ascii": "111",
"name": "muniname2",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 52,
"population": "4,000",
"beds": "23",
"bedsratio": "11.23"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[131.87, -25.76],
[131.35, -26.07],
[130.95, -26.78],
[130.82, -27.64],
[130.86, -28.53],
[131.26, -29.22],
[131.92, -29.76],
[132.45, -29.87],
[133.06, -29.76],
[133.72, -29.34],
[134.07, -28.80],
[134.20, -27.91],
[134.07, -27.21],
[133.81, -26.31],
[133.37, -25.83],
[132.71, -25.64],
[131.87, -25.76]
],
[
[133.15, -27.17],
[132.71, -26.86],
[132.09, -26.90],
[131.74, -27.56],
[131.79, -28.26],
[132.36, -28.45],
[132.93, -28.34],
[133.15, -27.76],
[133.15, -27.17]
]
]
}
}, {
"type": "Feature",
"properties": {
"letter": "g",
"color": "blue",
"rank": "7",
"ascii": "103",
"name": "muniname",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 55,
"population": "1,000",
"beds": "25",
"bedsratio": "11.24"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[138.12, -25.04],
[136.84, -25.16],
[135.96, -25.36],
[135.26, -25.99],
[135, -26.90],
[135.04, -27.91],
[135.26, -28.88],
[136.05, -29.45],
[137.02, -29.49],
[137.81, -29.49],
[137.94, -29.99],
[137.90, -31.20],
[137.85, -32.24],
[136.88, -32.69],
[136.45, -32.36],
[136.27, -31.80],
[134.95, -31.84],
[135.17, -32.99],
[135.52, -33.43],
[136.14, -33.76],
[137.06, -33.83],
[138.12, -33.65],
[138.86, -33.21],
[139.30, -32.28],
[139.30, -31.24],
[139.30, -30.14],
[139.21, -28.96],
[139.17, -28.22],
[139.08, -27.41],
[139.08, -26.47],
[138.99, -25.40],
[138.73, -25.00],
[138.12, -25.04]
],
[
[137.50, -26.54],
[136.97, -26.47],
[136.49, -26.58],
[136.31, -27.13],
[136.31, -27.72],
[136.58, -27.99],
[137.50, -28.03],
[137.68, -27.68],
[137.59, -26.78],
[137.50, -26.54]
]
]
}
}, {
"type": "Feature",
"properties": {
"letter": "l",
"color": "green",
"rank": "12",
"ascii": "108",
"name": "muniname5",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 60,
"population": "500",
"beds": "15",
"bedsratio": "12.0"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[140.14, -21.04],
[140.31, -29.42],
[141.67, -29.49],
[141.59, -20.92],
[140.14, -21.04]
]
]
}
}, {
"type": "Feature",
"properties": {
"letter": "e",
"color": "red",
"rank": "5",
"ascii": "101",
"name": "muniname6",
"created_at": "2013-02-19T19:11:52.458Z",
"updated_at": "2013-02-19T19:11:52.719Z",
"cartodb_id": 70,
"population": "10,000",
"beds": "200",
"bedsratio": "11.27"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[144.14, -27.41],
[145.67, -27.52],
[146.86, -27.09],
[146.82, -25.64],
[146.25, -25.04],
[145.45, -24.68],
[144.66, -24.60],
[144.09, -24.76],
[143.43, -25.08],
[142.99, -25.40],
[142.64, -26.03],
[142.64, -27.05],
[142.64, -28.26],
[143.30, -29.11],
[144.18, -29.57],
[145.41, -29.64],
[146.46, -29.19],
[146.64, -28.72],
[146.82, -28.14],
[144.84, -28.42],
[144.31, -28.26],
[144.14, -27.41]
],
[
[144.18, -26.39],
[144.53, -26.58],
[145.19, -26.62],
[145.72, -26.35],
[145.81, -25.91],
[145.41, -25.68],
[144.97, -25.68],
[144.49, -25.64],
[144, -25.99],
[144.18, -26.39]
]
]
}
}]
};html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>