ComputeDistanceBetween returning NaN instead of distance

Question

See the code below, I am amateur at javascript so sorry if it is really bad. Basically my function someFunc() is activated upon the press of a button after it has got the eventlocation and the currentlocation through some of forms and the other functions. I assume NaN is an error and I reckon that this has to be a fairly simple fix, I just done have a clue.

The two global variables globalevent and globalcurrent echo the correct coordinates using the doc set value in the someFunc() but the calculate distance isn't working. When I 'POST' the coords and bring them back as php variables it calculates just fine.

UPDATE: The following works @geocodezip put me in the right direction.

var map;
var pos;
var geocoder;

function initialize() {
  geocoder = new google.maps.Geocoder();
  var latlng = new google.maps.LatLng(-34.397, 150.644);
  var mapOptions = {
zoom: 3,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById('map-canvas'),
  mapOptions);
  }

function getLocation(){
if(navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
  pos = new google.maps.LatLng(position.coords.latitude,
                                   position.coords.longitude);
document.getElementById('distance').value = pos;  
}, function() {
  handleNoGeolocation(true);
});
} else {
// Browser doesn't support Geolocation
handleNoGeolocation(false);
}
}


function handleNoGeolocation(errorFlag) {
 if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}

var options = {
map: map,
position: new google.maps.LatLng(60, 105),
content: content
};

var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}

function createLine()
{

geocoder = new google.maps.Geocoder();
var address = document.getElementById('distance').value;
var address2 = document.getElementById('address').value;

var temp, temp2;

geocoder.geocode({ 'address': address }, function (results, status) {
temp = results[0].geometry.location;
geocoder.geocode({ 'address': address2 }, function (results, status) {
    temp2 = results[0].geometry.location;

var route = [
  temp,
  temp2
];

var polyline = new google.maps.Polyline({
    path: route,
    strokeColor: "#ff0000",
    strokeOpacity: 0.6,
    strokeWeight: 5
});

var lengthInMeters = google.maps.geometry.spherical.computeLength(polyline.getPath());
var distance = lengthInMeters/1000*0.621371192;

document.getElementById('distance2').value = distance;

polyline.setMap(map);
});
});
}

google.maps.event.addDomListener(window, 'load', initialize);

Answer 1

There is no computeDistanceBetween method in the Google Maps Javascript API v2, use GLatLng.distanceFrom in that version of the Google Maps Javascript API.

from the documentation

Note: The Google Maps JavaScript API Version 2 was officially deprecated on May 19, 2010. The original deprecation period has been extended from May 19, 2013 until November 19, 2013. As of this date, all applications requesting v2 will be served a special, wrapped version of the v3 API instead. We expect this wrapped version of the API will work for most simple maps, but we strongly encourage you to migrate your code to version 3 of the Maps JavaScript API before this date.

This creates a string:

globalcurrent = position.coords.latitude+","+position.coords.longitude;

This creates a GLatLng with those coordinates:

for v2:

globalcurrent = new GLatLng(position.coords.latitude,position.coords.longitude);

for v3:

globalcurrent = new google.maps.LatLng(position.coords.latitude,position.coords.longitude);