async calls to google service using javascript

Question

I have one array

SchoolAddress[0] = Abelsvej 98, 4100, Ringsted;
SchoolAddress[1] = Prstevej 19, 4100, Ringsted;
SchoolAddress[2] = Haraldsvej 77, 4100, Ringsted;

I have to get latitude & longitude for this address.

I am using google geocoder for this.

for (var i = 0; i < schools.length; i++) 
{
    var address = schools[i][1];
    var geocoder = new google.maps.Geocoder();
    geocoder.geocode({ 'address': address }, function (results, status) 
    {
        var location = results[0].geometry.location;
        schoolslat[i] = location.lat() + ', ' + location.lng();
    });
} 

Here what happens is as call takes some time, the values coming from call do not go to proper schoolslat[i].

Answer 1

You may use closure to freeze variable i in your request:

for (var i = 0; i < schools.length; i++) 
{
    (function(i){
        var address = schools[i];
        var geocoder = new google.maps.Geocoder();
        geocoder.geocode({ 'address': address }, function (results, status) 
        {
            var location = results[0].geometry.location;
            schoolslat[i] = location.lat() + ', ' + location.lng();
        });
    }(i));
}

UPD:

JSFiddle example.