谷歌地图实时跟踪问题与折线 [英] google maps live tracking issue with Polylines
问题描述
我试图通过谷歌地图开始实时跟踪通过ajax从数据库获取新位置,它工作正常,但问题是绘制多段线我得到这个错误InvalidValueError:在索引0:不是LatLng或LatLngLiteral :不是一个对象,这意味着行变量值不能用作这里的一个点
错误告诉你这:
var line ={lat:+ lat +,lng:+ lon +},;
不是 google.maps.LatLng
或 google.maps.LatLngLiteral
,因为它不是,它是一个字符串。
这会是一个有效的 google.maps.LatLngLiteral
:
var line = {lat :lat,lng:lon};
程式码片段:
var map = new google.maps.Map(document.getElementById('map'),{zoom:15,mapTypeId:google var initLevel = 42; var initlon = -72; var increment = 0.001; var count = 0; var flightPlanCoordinates = []; function autoUpdate(){/ * $。 post('ajax / track.php',{car:'1'})。done(function(data){* / data = JSON.stringify({lat:+(initlat + increment * count),lon:+ initlon + increment * count)}); // data ={lat:+(initlat + increment * count)+,lon:+(initlon + increment * count)+}; count ++; var parsed = JSON.parse(data); var lat =解析.lat,lon = parsed.lon; var newPoint = new google.maps.LatLng(lat,lon); // var line ={lat:+ lat +,lng:+ lon +},; var line = {lat:lat,lng:lon}; flightPlanCoordinates.push(线);如果(标记){/ /标记已经创建 - 移动它marker.setPosition(newPoint); var flightPath = new google.maps.Polyline({path:flightPlanCoordinates,geodesic:true,strokeColor:'#FF0000',strokeOpacity:1.0,strokeWeight:2}); flightPath.setMap(地图); } else {marker = new google.maps.Marker({position:newPoint,map:map,icon:{url:https://maps.gstatic.com/intl/en_us/mapfiles/markers2/measle.png, size:new google.maps.Size(7,7),anchor:new google.maps.Point(3.5,3.5)}}); } map.setCenter(newPoint); //}); setTimeout(autoUpdate,5000);} autoUpdate();
html,body,#map {height:100%;宽度:100%; margin:0px; < script src =https:// //maps.googleapis.com/maps/api/js\"></script><div id =map>< / div>
I'm trying to start a live tracking via google maps fetching new locations from a database via ajax and it works fine but the problem is with drawing Polylines I get this error "InvalidValueError: at index 0: not a LatLng or LatLngLiteral: not an Object" which means the "line" variable value can't be used as a point as in here google maps link. Here's the code
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var marker = null;
function autoUpdate() {
$.post('ajax/track.php',{car:'1'}).done(function (data) {
var parsed = JSON.parse(data);
var lat = parsed.lat,
lon = parsed.lon;
var newPoint = new google.maps.LatLng(lat,lon);
var line = "{lat: "+lat+", lng: "+lon+"},";
if (marker) {
// Marker already created - Move it
marker.setPosition(newPoint);
var flightPlanCoordinates = [
];
flightPlanCoordinates.push(line);
var flightPath = new google.maps.Polyline({
path: flightPlanCoordinates,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(map);
}
else {
marker = new google.maps.Marker({
position: newPoint,
map: map,
icon: 'images/1.png',
});
}
map.setCenter(newPoint);
});
setTimeout(autoUpdate, 5000);
}
autoUpdate();
UPDATE as suggested by @geocodezip: var line = {lat: lat, lng: lon}; I got this error "InvalidValueError: at index 0: not a LatLng or LatLngLiteral: in property lat: not a number" so I changed it into
var line = {lat: parseFloat(lat), lng: parseFloat(lon)};
in console I get the last location only not an array of locations
The error is telling you that this:
var line = "{lat: "+lat+", lng: "+lon+"},";
Is not a google.maps.LatLng
or a google.maps.LatLngLiteral
, because it isn't, it is a string.
This would be a valid google.maps.LatLngLiteral
:
var line = {lat: lat, lng: lon};
code snippet:
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var marker = null;
var initlat = 42;
var initlon = -72;
var increment = 0.001;
var count = 0;
var flightPlanCoordinates = [];
function autoUpdate() {
/* $.post('ajax/track.php', {
car: '1'
}).done(function(data) { */
data = JSON.stringify({
lat: +(initlat + increment * count),
lon: +(initlon + increment * count)
});
// data = "{lat:" + (initlat + increment * count) + ",lon:" + (initlon + increment * count) + "}";
count++;
var parsed = JSON.parse(data);
var lat = parsed.lat,
lon = parsed.lon;
var newPoint = new google.maps.LatLng(lat, lon);
// var line = "{lat: " + lat + ", lng: " + lon + "},";
var line = {
lat: lat,
lng: lon
};
flightPlanCoordinates.push(line);
if (marker) {
// Marker already created - Move it
marker.setPosition(newPoint);
var flightPath = new google.maps.Polyline({
path: flightPlanCoordinates,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(map);
} else {
marker = new google.maps.Marker({
position: newPoint,
map: map,
icon: {
url: "https://maps.gstatic.com/intl/en_us/mapfiles/markers2/measle.png",
size: new google.maps.Size(7, 7),
anchor: new google.maps.Point(3.5, 3.5)
}
});
}
map.setCenter(newPoint);
// });
setTimeout(autoUpdate, 5000);
}
autoUpdate();
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>
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