我创建了一个在DataLayer：Drag and Drop教程中工作的JSON FeatureCollection。到目前为止它只是2条道路的集合，但我无法弄清楚如何加载JSON文件。它现在是一个本地文件，所以我认为调用它并设计它ala教程会让我走上正确的道路。但它没有用。这是HTML和JSON文件。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<title>FMRE Main Map</title>
<!-- Style Section for the Window -->
<style>
html { height: 610px; width: 575px; }
body { height: 610px; width:575px; margin: 0; padding: 0 }
#map-canvas { height: 604px; width: 566px;}
}
</style>
<!-- Calling the Google Map API version 3 -->
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<!-- Styling the Custom Main Map -->
<script>
var fmreMain = new google.maps.LatLng(29.681418,-95.714802);
var MY_MAPTYPE_ID = 'custom_style';
<!-- Styling for the Different Features on the Map from Google -->
function initialize() {
var featureOpts = [
{
"featureType": "poi.sports_complex",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.attraction",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.business",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "landscape.man_made",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.medical",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.government",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.place_of_worship",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.attraction",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.park",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "poi.park",
"elementType": "labels.text",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "administrative.land_parcel",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.local",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.arterial",
"elementType": "labels.text",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.highway",
"elementType": "labels.icon",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.highway",
"elementType": "labels.text",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.highway",
"elementType": "geometry",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.arterial",
"elementType": "geometry",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.arterial",
"elementType": "labels.text",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "road.arterial",
"elementType": "labels.icon",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "water",
"elementType": "labels.text",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "water",
"stylers": [
{ "color": "#0000ff" }
]
},
{
"featureType": "landscape.natural.landcover",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "landscape.natural.terrain",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "administrative.locality",
"stylers": [
{ "visibility": "off" }
]
},
{
"featureType": "administrative.neighborhood",
"stylers": [
{ "visibility": "off" }
]
}
];
<!-- Setting for the Main Map -->
var mapOptions = {
center: fmreMain,
backgroundColor: "#330033",
zoom: 11,
maxZoom: 12,
minZoom: 10,
zoomControl: false,
mapTypeControl: false,
streetViewControl: false,
panControl: false,
mapTypeId: MY_MAPTYPE_ID
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
<!-- Settings for the Custom View Box -->
var styledMapOptions = {
name: 'FMRE',
alt: 'Katy Areas'
};
var customMapType = new google.maps.StyledMapType(featureOpts, styledMapOptions);
map.data.loadGeoJson('\JSON_MAP_COMPONENTS\Area_Main_Roads.json');
var featureStyle = {
strokeColor: '#ff3333',
strokeWeight: 4
}
map.data.setStyle(featureStyle);
map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
GeoJSON文件
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]
},
"properties": {
"name": "beltway8"
}
}
]
}
答案 0 :(得分：3)
我不希望loadGeoJSON使用本地文件（出于安全考虑，大多数浏览器默认禁止访问本地文件系统）。如果要使用本地数据，请使用addGeoJSON方法：
var data = {... your GeoJSON ...};
map.data.addGeoJson(data);
var featureStyle = {
strokeColor: '#ff3333',
strokeWeight: 4
}
map.data.setStyle(featureStyle);
这适用于我在Chrome中的本地计算机：
（SO_20140815_data.js如下）：
<!-- Calling the Google Map API version 3 -->
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script src="SO_20140815_data.js"></script>
在初始化结束时
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
<!-- Settings for the Custom View Box -->
var styledMapOptions = {
name: 'FMRE',
alt: 'Katy Areas'
};
var customMapType = new google.maps.StyledMapType(featureOpts, styledMapOptions);
map.data.addGeoJson(data);
var featureStyle = {
strokeColor: '#ff3333',
strokeWeight: 4
}
map.data.setStyle(featureStyle);
map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);
SO_20140815_data.js
var data = { "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry":
{ "type": "LineString",
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},
"properties": {"name": "US90A"}
},
{ "type": "Feature",
"geometry":{
"type": "LineString",
"coordinates": [[ -95.443899579354223, 29.596551757594483 ],[ -95.450711550556974, 29.596484410458228 ],[ -95.45277832877342, 29.596462723335119 ],[ -95.45356724676536, 29.596499811907325 ],[ -95.454353644075795, 29.596564170654567 ],[ -95.455136735454545, 29.596655778795721 ],[ -95.45591495406353, 29.59677442440762 ],[ -95.456686734752026, 29.596919892830492 ],[ -95.457381279038472, 29.59709116724034 ],[ -95.458067954181161, 29.597285101420141 ],[ -95.458745995832203, 29.597501158248217 ],[ -95.459414622832455, 29.597739145305841 ],[ -95.460072268112356, 29.597998849392376 ],[ -95.460718162351412, 29.598279734717035 ],[ -95.461351533466939, 29.598581437290846 ],[ -95.463276789092376, 29.599511264356774 ],[ -95.464685045741405, 29.600188541465812 ],[ -95.46854040288855, 29.601866776479294 ],[ -95.473923714541257, 29.604273032904768 ],[ -95.476934942436216, 29.605718447810595 ],[ -95.480400133276476, 29.607309524771566 ],[ -95.483843080659824, 29.608909555267655 ],[ -95.486513278910948, 29.610116556280001 ],[ -95.489106794010056, 29.611312031891693 ],[ -95.493886416648991, 29.613552388324642 ],[ -95.495670092148671, 29.61438838323145 ],[ -95.496562499795544, 29.6148320294066 ],[ -95.500388952514228, 29.617062606614923 ],[ -95.501303319592438, 29.617555805086603 ],[ -95.502232662657988, 29.618025656379043 ],[ -95.503177768799176, 29.618472184994413 ],[ -95.504137084846761, 29.618894830235377 ],[ -95.505109046665112, 29.619293208653353 ],[ -95.506094454690611, 29.619666998584208 ],[ -95.510863881626875, 29.621520540100246 ],[ -95.511482803464602, 29.62179255826964 ],[ -95.512088445235847, 29.622084688405721 ],[ -95.512681608069855, 29.622396612064549 ],[ -95.513260731305806, 29.622727768933142 ],[ -95.513825827437429, 29.623077987650749 ],[ -95.514374555254321, 29.623446522783393 ],[ -95.514906935766419, 29.623832856677883 ],[ -95.516322721289569, 29.624977836241506 ],[ -95.518154168081537, 29.62651674184098 ],[ -95.520811518798681, 29.628749287154772 ],[ -95.524148403078357, 29.631583919128758 ],[ -95.537081997353297, 29.642482136629464 ]]
},
"properties": {"name": "beltway8"}
}]};
答案 1 :(得分：2)
使用此example作为指南，我能够将GeoJSON数据放入本地文件中并加载它。
html文件：
<!DOCTYPE html>
<html style="height:100%;margin:0;padding:0">
<body style="height:90%;margin:10;padding:0">
<h1>Google Maps</h1>
<div id="gmap" style="width:100%;height:80%;"></div>
<script>
var coordinates;
function showMap() {
var script = document.createElement("script");
script.src = "my_geojson.js";
document.getElementsByTagName("head")[0].appendChild(script);
}
window.geojson_callback = function(results) {
console.log(results.geometry.coordinates);
coordinates = results.geometry.coordinates;
var centerCoord = new google.maps.LatLng(coordinates[0], coordinates[1]);
var mapCanvas = document.getElementById("gmap");
var mapOptions = {center: centerCoord, zoom: 8};
var map = new google.maps.Map(mapCanvas, mapOptions);
var marker = new google.maps.Marker({position:centerCoord});
marker.setMap(map);
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=showMap"></script>
</body>
</html>
my_geojson.js文件：
geojson_callback({
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [44.6294281206632,-123.060811758041]
},
"properties": {
"name": "In London"
}
});
注意：
在Firefox 51.0.1和Opera 42.0上测试。