Google 地图 API v3 信息 Window setContent 语法错误

Question

我正在尝试设置信息的内容 window，但在访问 JSON 对象时遇到语法错误。

Example from elsewhere on Stack Overflow I am following

JavaScript 片段：

        var localLayer = new google.maps.Data();
        localLayer.loadGeoJson('JSON/local.geojson');
        localLayer.setMap(map);

        var localInfoWindow = new google.maps.InfoWindow({
            var address = localLayer.features.properties.Address;
            content: "<h3>" + address + "</h3>"
        });

        google.maps.event.addListener(localLayer, 'click', function(event){
            localInfoWindow.setPosition(event.feature.getGeometry().get());
            localInfoWindow.open(map, localLayer);
        });

我做错了什么？

JSON 片段：

{
"type": "FeatureCollection",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },

"features": [
{ "type": "Feature", "properties": { "OBJECTID": 1, "Address": "14300 McMullen Highway SW", "City": "Cumberland", "State": "MD", "Zip_Code": 21502, "Type": "Detention Center", "Agency_Nam": "Allegany County Detention Center", "County": "Allegany" }, "geometry": { "type": "Point", "coordinates": [ -78.823195987258302, 39.598971947812366 ] } },
{ "type": "Feature", "properties": { "OBJECTID": 2, "Address": "131 Jennifer Road", "City": "Annapolis", "State": "MD", "Zip_Code": 21401, "Type": "Detention Center", "Agency_Nam": "Anne Arundel County Detention Center", "County": "Anne Arundel" }, "geometry": { "type": "Point", "coordinates": [ -76.530041483218611, 38.988903980495373 ] } }, . . .

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Maryland Prisoner Map</title>
    <!--jQuery-->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <!--Google Maps API-->
    <script src="http://maps.googleapis.com/maps/api/js"></script>
    <!--Stamen Basemaps-->
    <script type="text/javascript" src="http://maps.stamen.com/js/tile.stamen.js?v1.3.0"></script>
    <!--CSS-->
    <link href="style.css" rel="stylesheet" type="text/css">
    <!--JavaScript-->
    <script src="script.js" type="text/javascript"></script>
</head>
<body class="page-wrap">
        <h1 id="header">Maryland Prisoner Map</h1>
        <p></p>
        <div id="map"></div>
</body>
</html>

CSS:

#header {
    text-align: center;
}

#map {
    height: 450px;
    width: 80%;
    margin: 0 auto;
    border: 1px solid black;
    box-shadow: 2px 2px 1px 2px gray;
}

* {
    margin: 0;
}
html, body {
    height: 100%;
}

JavaScript:

    $(document).ready(function() {
        var layer = "toner-lite";
        var map = new google.maps.Map(document.getElementById("map"), {
            center: new google.maps.LatLng(39.290385, -76.612189),
            zoom: 10,
            mapTypeId: layer,
            mapTypeControlOptions: {
                mapTypeIds: [layer, google.maps.MapTypeId.HYBRID]
            }
        });
        map.mapTypes.set(layer, new google.maps.StamenMapType(layer));
        //load data into map
        var localLayer = new google.maps.Data();
        localLayer.loadGeoJson('JSON/local.geojson');
        localLayer.setMap(map);

        var localInfoWindow = new google.maps.InfoWindow({
            var address = localLayer.features.properties.Address;
            content: "<h3>" + address + "</h3>"
        });

        google.maps.event.addListener(localLayer, 'click', function(event){
            localInfoWindow.setPosition(event.feature.getGeometry().get());
            localInfoWindow.open(map, localLayer);
        });

        var stateLayer = new google.maps.Data();
        stateLayer.loadGeoJson('JSON/state.geojson');
        stateLayer.setMap(map);

        var stateInfoWindow = new google.maps.InfoWindow({
            content: "I am a state level jail or prison"
        });

        google.maps.event.addListener(stateLayer, 'click', function(event){
            stateInfoWindow.setPosition(event.feature.getGeometry().get());
            stateInfoWindow.open(map, stateLayer);
        });

        var federalLayer = new google.maps.Data();
        federalLayer.loadGeoJson('JSON/federal.geojson');
        federalLayer.setMap(map);

        var federalInfoWindow = new google.maps.InfoWindow({
            content: "I am a federal level jail or prison"
        });

        google.maps.event.addListener(federalLayer, 'click', function(event){
            federalInfoWindow.setPosition(event.feature.getGeometry().get());
            federalInfoWindow.open(map, federalLayer);
        });


        var marylandLayer = new google.maps.Data();
        marylandLayer.loadGeoJson('JSON/maryland.geojson');
        //give the map style
        marylandLayer.setStyle(function(feature) {
            return {
                fillColor: getColor(feature.getProperty('Difference')), // call function to get color for state based on the COLI (Cost of Living Index)
                fillOpacity: 0.9,
                strokeColor: '#FFFFFF',
                strokeWeight: 1,
                zIndex: 1
            };
        });
        //set layer to map
        marylandLayer.setMap(map)
        //get some color
        function getColor(Difference) {
        return Difference >= 94 ? '#b10026' :
               Difference > 76 ? '#e31a1c' :
               Difference > 58 ? '#fc4e2a' :
               Difference > 38 ? '#fd8d3c' :
               Difference > 20 ? '#feb24c' :
               Difference > 7 ? '#fed976' :
               Difference > 1 ? '#ffffb2' :
               Difference > -1 ? '#FFFFFF' :
               '#000000';
        };

    // Add mouseover and mouse out styling for the GeoJSON Maryland data
    marylandLayer.addListener('mouseover', function(e) {
        marylandLayer.overrideStyle(e.feature, {
            strokeColor: '#2a2a2a',
            strokeWeight: 2,
            zIndex: 2
        });
    });
    marylandLayer.addListener('mouseout', function(e) {
        marylandLayer.revertStyle();
    });

    var polygonInfoWindow = new google.maps.InfoWindow({
        content: marylandLayer.features.properties.Difference
    });
    google.maps.event.addListener(marylandLayer, 'click', function(event){
        polygonInfoWindow.setPosition(event.feature.getGeometry().get());
        polygonInfoWindow.open(map, marylandLayer);
    });
});

Answer 1

您需要将内容加载到 'click' 层侦听器内的信息窗口中。在该函数内 evt 是对该功能的引用，您可以调用 getProperty 方法来访问该功能的属性：

localLayer.addListener('click', function (evt) {
    var address = evt.feature.getProperty("Address");
    localInfoWindow.setContent("<h3>" + address + "</h3>");
    localInfoWindow.setPosition(evt.feature.getGeometry().get());
    localInfoWindow.open(map);
});

proof of concept fiddle

Google 地图 API v3 信息 Window setContent 语法错误

Google Maps API v3 Info Window setContent syntax error

json

google-maps

google-maps-api-3

dynamic

infowindow