我有一个地图和一个包含餐馆信息的JSON文件。我需要从 JSON 文件向地图添加 20 家餐厅的标记,但我只是无法让地图加载带有标记。我认为我没有正确从 JSON 文件中检索数据。如果能有正确的方向,将不胜感激。
这是我的代码:
var map;
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(55.9753905, -1.6236163),
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new
google.maps.Map(document.getElementById("EstablishmentCollection"),
mapOptions);
$.getJSON("'FHRS_json.json'", function(json1) {
$.each(json1, function(key, data) {
var latLng = new google.maps.LatLng(data.lat, data.lng);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
title: data.BusinessName
});
marker.setMap(map);
});
});
然后这是 JSON 文件开头的示例。有很多餐馆,所以我不会全部发布。
{
"FHRSEstablishment": {
"-xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
"Header": {
"ExtractDate": "2018-02-03",
"ItemCount": "2369",
"ReturnCode": "Success"
},
"EstablishmentCollection": {
"EstablishmentDetail": [
{
"FHRSID": "1011573",
"LocalAuthorityBusinessID": "17/00395/MIXED",
"BusinessName": "#Central",
"BusinessType": "Pub/bar/nightclub",
"BusinessTypeID": "7843",
"AddressLine1": "15 Marlborough Crescent",
"AddressLine2": "Newcastle upon Tyne",
"PostCode": "NE1 4EE",
"RatingValue": "AwaitingInspection",
"RatingKey": "fhrs_awaitinginspection_en-GB",
"RatingDate": { "-xsi:nil": "true" },
"LocalAuthorityCode": "416",
"LocalAuthorityName": "Newcastle Upon Tyne",
"LocalAuthorityWebSite": "http://www.newcastle.gov.uk/",
"LocalAuthorityEmailAddress": "psr@newcastle.gov.uk",
"SchemeType": "FHRS",
"NewRatingPending": "False",
"Geocode": {
"Longitude": "-1.62244200000000",
"Latitude": "54.96785900000000"
}
},
我认为您遇到的主要问题是您需要解析浮点数。目前它们只是字符串。您可以使用以下函数创建标记。只需将建立作为对象传递到函数中,它就会为您创建标记:
function createMarker(obj) {
const LatLng = new google.maps.LatLng(
parseFloat(obj.geocode.Latitude),
parseFloat(obj.gecode.Longitude)
); marker = new google.maps.Marker({
position: LatLng,
map: map,
title: obj.BusinessName
});
}
尝试将循环更改为:
$.each(json1.EstablishmentCollection.EstablishmentDetail, function(key, data) {
var coords = data.Geocode;
//look in browser console for errors and/or proper lat/lng object
console.log(coords)
var latLng = new google.maps.LatLng(+coords.Latitude, +coords.Longitude);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
title: data.BusinessName
});
marker.setMap(map);
});
将循环处理更改为通过 JSON 数据中的数组进行处理:
$.each(jsonData.EstablishmentCollection.EstablishmentDetail, function(key, data) {
var latLng = new google.maps.LatLng(data.Geocode.Latitude, data.Geocode.Longitude);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
title: data.BusinessName
});
marker.setMap(googleMap);
});
概念验证小提琴
代码片段:
html,
body,
#googleMap {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="googleMap"></div>
<script>
function initialize() {
var center = new google.maps.LatLng(54.9753905, -1.6236163);
var mapCanvas = document.getElementById("googleMap");
var mapOptions = {
center: center,
zoom: 12
};
var googleMap = new google.maps.Map(mapCanvas, mapOptions);
$.each(jsonData.EstablishmentCollection.EstablishmentDetail, function(key, data) {
var latLng = new google.maps.LatLng(data.Geocode.Latitude, data.Geocode.Longitude);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
title: data.BusinessName
});
marker.setMap(googleMap);
});
}
</script>
<script>
var jsonData = {
"EstablishmentCollection": {
"EstablishmentDetail": [{
"FHRSID": "1011573",
"LocalAuthorityBusinessID": "17/00395/MIXED",
"BusinessName": "#Central",
"BusinessType": "Pub/bar/nightclub",
"BusinessTypeID": "7843",
"AddressLine1": "15 Marlborough Crescent",
"AddressLine2": "Newcastle upon Tyne",
"PostCode": "NE1 4EE",
"RatingValue": "AwaitingInspection",
"RatingKey": "fhrs_awaitinginspection_en-GB",
"RatingDate": {
"-xsi:nil": "true"
},
"LocalAuthorityCode": "416",
"LocalAuthorityName": "Newcastle Upon Tyne",
"LocalAuthorityWebSite": "http://www.newcastle.gov.uk/",
"LocalAuthorityEmailAddress": "psr@newcastle.gov.uk",
"SchemeType": "FHRS",
"NewRatingPending": "False",
"Geocode": {
"Longitude": "-1.62244200000000",
"Latitude": "54.96785900000000"
}
}]
}
}
</script>
<script async defer src="https://maps.googleapis.com/maps/api/js?callback=initialize"></script>