问题
Hey everybody! Im trying to use getLatLng() to geocode a list of postal/zip codes and store the generated point in the database to be placed on a map later. This is what I've got so far:
$(".geocodethis").click(function () {
var geocoder = new GClientGeocoder();
var postalCode = $(this).siblings(".postal").val();
var id = $(this).siblings(".id").val();
geocoder.getLatLng(postalCode, function (point) {
if (!point) {
alert(postalCode + " not found");
} else {
alert(point);
var serializedPoint = $.param(point);
//Geocode(id, point);
}
});
});
function Geocode(id, point) {
alert(point);
$.post("/Demographic/Geocode/" + id, point, function () {
alert("success?");
});
}
but I'm getting this.lat is not a function in my error console when i try to serialize the point object or use it in $.post()
From my research, I understand that geocoder.getLatLng() is asynchronous, how would that affect what I'm trying to do? I'm not running this code in a loop, and I'm trying to post the point using the anonymous callback function.
How can I save the information from point to use later?
Update
Creating a marker and trying to post that still results in the this.lat is not a function in the error console.
$(".geocodethis").click(function () {
var geocoder = new GClientGeocoder();
var postalCode = $(this).siblings(".postal").val();
var id = $(this).siblings(".id").val();
geocoder.getLatLng(postalCode, function (point) {
if (!point) {
alert(postalCode + " not found");
} else {
alert(point);
var marker = new GMarker(point);
$.post("/Demographic/Geocode/" + id, marker, function () {
alert("success?");
});
}
});
});
** Another Update **
I really need to save the geocoded address for later, even if I store the latitude/longitude values in my database and remake the marker when I'm ready to put it onto a map. Again, serializing or posting - seemingly using the point in any way other than in google maps functions gives the this.lat is not a function exception in my error log.
I'm using asp.net mvc - are there any frameworks out there that would make this easier? I really need help with this. Thanks.
回答1:
If your stuck for 2 days maybe a fresh v3 start would be a good thing, this snipped does a similair job for me...
function GetLocation(address) {
var geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'address': address }, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
ParseLocation(results[0].geometry.location);
}
else
alert('error: ' + status);
});
}
}
function ParseLocation(location) {
var lat = location.lat().toString().substr(0, 12);
var lng = location.lng().toString().substr(0, 12);
//use $.get to save the lat lng in the database
$.get('MatchLatLang.ashx?action=setlatlong&lat=' + lat + '&lng=' + lng,
function (data) {
// fill textboss (feedback purposes only)
//with the found and saved lat lng values
$('#tbxlat').val(lat);
$('#tbxlng').val(lng);
$('#spnstatus').text(data);
});
}
回答2:
Have you tried this?
$(".geocodethis").click(function () {
var geocoder = new GClientGeocoder();
var postalCode = $(this).siblings(".postal").val();
var id = $(this).siblings(".id").val();
geocoder.getLatLng(postalCode, function (point) {
if (!point) {
alert(postalCode + " not found");
} else {
alert(point);
var marker = new GMarker(point);
map.addOverlay(marker);
obj = {lat: marker.position.lat(),
lng: marker.position.lng()};
$.post("/Demographic/Geocode/" + id, obj, function () {
alert("success?");
});
}
});
});
I haven't used V2 in a long time, so I'm not sure about the exact syntax, but the point is to create an object from the information you need (lat/lng) and serialize that.
Also, an upgrade to V3 is much recommended, if plausible.
回答3:
You need to set a marker on the map, which takes a lat/long. You can save that info however you want or display immediately. (Code truncated for demo purpose)
map = new google.maps.Map(document.getElementById("Map"), myOptions);
geocoder.geocode({ 'address': address }, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var marker = new google.maps.Marker({
position: results[0].geometry.location
});
marker.setMap(map);
}
}
UPDATE (FOR v2)
$(".geocodethis").click(function () {
var geocoder = new GClientGeocoder();
var postalCode = $(this).siblings(".postal").val();
var id = $(this).siblings(".id").val();
geocoder.getLatLng(postalCode, function (point) {
if (!point) {
alert(postalCode + " not found");
} else {
map.setCenter(point, 13);
var marker = new GMarker(point);
map.addOverlay(marker);
}
});
});
回答4:
In V3 the coordinates must be first serialized as a string as shown by Arnoldiuss, before sending as json post data.
var lat = latlong.lat().toString().substr(0, 12); var lng = latlong.lng().toString().substr(0, 12);
回答5:
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<%@ taglib prefix="s" uri="/struts-tags"%>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?key=AIzaSyDS1d1116agOa2pD9gpCuvRDgqMcCYcNa8&sensor=false"></script>
<script type="text/javascript">
function initialize() {
var latitude = document.getElementById("latitude").value;
latitude = latitude.split(",");
var longitude = document.getElementById("longitude").value;
longitude = longitude.split(",");
var locName = document.getElementById("locName").value;
locName = locName.split(",");
var RoadPathCoordinates = new Array();
RoadPathCoordinates.length = locName.length;
var locations = new Array();
locations.length = locName.length;
var infowindow = new google.maps.InfoWindow();
var marker, i;
var myLatLng = new google.maps.LatLng(22.727622,75.895719);
var mapOptions = {
zoom : 16,
center : myLatLng,
mapTypeId : google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
//To Draw a line
for (i = 0; i < RoadPathCoordinates.length; i++)
RoadPathCoordinates[i] = new google.maps.LatLng(latitude[i],longitude[i]);
var RoadPath = new google.maps.Polyline({
path : RoadPathCoordinates,
strokeColor : "#FF0000",
strokeOpacity : 1.0,
strokeWeight : 2
});
//Adding Marker to given points
for (i = 0; i < locations.length; i++)
locations[i] = [locName[i],latitude[i],longitude[i],i+1];
for (i = 0; i < locations.length; i++)
{marker = new google.maps.Marker({
position : new google.maps.LatLng(locations[i][1], locations[i][2]),
map : map
});
//Adding click event to show Popup Menu
var LocAddress ="";
google.maps.event.addListener(marker, 'click', (function(marker, i)
{ return function()
{
GetAddresss(i);
//infowindow.setContent(locations[i][0]);
infowindow.setContent(LocAddress);
infowindow.open(map, marker);
}
})(marker, i));}
function GetAddresss(MarkerPos){
var geocoder = null;
var latlng;
latlng = new google.maps.LatLng(latitude[MarkerPos],longitude[MarkerPos]);
LocAddress = "91, BAIKUNTHDHAAM"; //Intializing just to test
//geocoder = new GClientGeocoder(); //not working
geocoder = new google.maps.Geocoder();
geocoder.getLocations(latlng,function ()
{
alert(LocAddress);
if (!response || response.Status.code != 200) {
alert("Status Code:" + response.Status.code);
} else
{
place = response.Placemark[0];
LocAddress = place.address;
}
});
}
//Setting up path
RoadPath.setMap(map);
}
</script>
</head>
<body onload="initialize()">
<s:form action="mapCls" namespace="/">
<s:hidden key="latitude" id="latitude"/>
<s:hidden key="longitude" id="longitude"/>
<s:hidden key="locName" id="locName"/>
<div id="map_canvas" style="float:left;width:70%;height:100%"></div>
</s:form>
</body>
</html>
I am doing reverse Geocoding, and want address of marker using lat and longitude. M facing problem with function "GetAddresss()", line "geocoder.getLocations(latlng,function ()" is not working properly. what should I Do?
来源：https://stackoverflow.com/questions/5782611/how-do-i-use-google-maps-geocoder-getlatlng-and-store-its-result-in-a-database