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Editorial Team
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Asked: 2026-05-21T16:42:37+00:00

Hi I am working with google maps API I have this huge code, so

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Hi I am working with google maps API
I have this huge code, so I dont want to scare away people with code
Basically this is what I need to do

I have a javascript(1) function that I call from Html after someone clicks a button,
from that function I do some processing to calculate the latitudes and longitudes and call a custom function which uses the latitudes and longitudes and calls a google maps function. I need to pass that the value from the google maps call back function back to the javascript function (1)

here is how it goes

————–File First.html—————-

<script type="text/javascript" src="functions.js"></script>
<script type="text/javascript">
function docalculation
{
  .....some calculations for latlng......
  var value = get_value(latlng);
}
</script>
<html>
  .....html file....
  <input type="button" value="Create Directions" onClick="docalculation()">
</html>

——————-file functions.js—————-

var return_val;
function get_val(latlng)
{
  geocoder = new google.maps.Geocoder();
  geocoder.geocode({'latLng': latlng}, function(results, status) {

  return_val = (results[0].address_components[i].long_name);
  alert(return_val); //here I get the value that I need in alert
  }

alert (return_val); // here the value suddenly becomes undefined
return val; // hence returns undefined
}

Please help I am stuck here and could not find a solution even after 2 days of googling and trying everything I know.

any help appreciated thanks

The simplest solution that I am looking for would be some way to store the value of return_val into variable value

Thanks

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1 Answer

  1. Editorial Team

    That’s because geocode() is asynchronous: it returns immediately but the callback function is invoked as soon as the response arrives. You need to accept a callback in get_val() and pass the value to this method instead of trying to return it (it’s impossible):

    function get_val(latlng, cb) {
    geocoder = new google.maps.Geocoder();
    geocoder.geocode({
        'latLng': latlng
    }, function (results, status) {
        cb(results[0].address_components[i].long_name);
    });
}

    Usage:

    get_value(latlng, function(longName) {
    /* do something */
});
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