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].

Community · Accepted Answer · 2017-05-23 11:49:59Z

3

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.

edited May 23, 2017 at 11:49

CommunityBot

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answered Apr 13, 2013 at 8:50

fedosov

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8 Comments

fedosov Over a year ago

Can you provide array content of schools?

vaibhav shah Over a year ago

my array is [Abelsvej 98, 4100, Ringsted], [Almstoftevej 71, 4100, Ringsted], [Balstrupvej 35, 4100, Ringsted], [Ejlstrupvej 101, 4100, Ringsted], [Ejlstrupvej 101 C 101, 4100, Ringsted], [Ejlstrupvej 90 90, 4100, Ringsted], [Haraldsvej 7 7, 4100, Ringsted], [Løngangen 43 65, 4100, Ringsted], [Vetterslev Bygade 21 21, 4100, Ringsted], [Østergade 25, Høm 25, 4100, Ringsted], [Østergade 3, høm 3, 4100, Ringsted]

fedosov Over a year ago

In that case schools[i][1] always gives you the second character of an address as a search term, so you searching for b, l, a, j etc.

fedosov Over a year ago

I fixed this example jsfiddle.net/fedosov/Ypf8v/10 (missing semicolon). But you must provide some timeout between requests, otherwise you get OVER_QUERY_LIMIT error.

fedosov Over a year ago

let us continue this discussion in chat

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