Passing data from a method callback to a function and returning a variable in the same function

Question

Passing data from a method callback to a function and returning a variable in the same function

Is there a way to properly return the latlon variable from the codeAddress function? The typical 'return latlon' doesn't seem to work, possibly due to scope issues. Any suggestions on how to resolve this?

function codeAddress(addr) { 
       if (geocoder) { 
           geocoder.geocode({ 'address': addr}, function(results, status) {
                    if (status == google.maps.GeocoderStatus.OK) {
                    var latlon = results[0].geometry.location.c+","+results[0].geometry.location.b;  
                    } else {
                       alert("Geocode was not successful for the following reason: " + status);
                   }

       });
     }  
   }

javascript function callback return

Answer 1

Answer №1

Initialize a variable in the outer function, modify it in the inner function, and then return it from the outer function:

function updateLocation(location) { 
  var success = false;
  if (geocoder) { 
    geocoder.geocode({ 'address': location}, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        var coordinates = results[0].geometry.location.lat() + "," + results[0].geometry.location.lng();
        success = true;
      } else {
        alert("Geocoding was not successful due to: " + status);
      }
    });
  }  
  return success;
}

PLEASE NOTE: The functionality is dependent on immediate execution of the inner function!

Answer 2

Initialize a variable in the outer function, modify it in the inner function, and then return it from the outer function:

function updateLocation(location) { 
  var success = false;
  if (geocoder) { 
    geocoder.geocode({ 'address': location}, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        var coordinates = results[0].geometry.location.lat() + "," + results[0].geometry.location.lng();
        success = true;
      } else {
        alert("Geocoding was not successful due to: " + status);
      }
    });
  }  
  return success;
}

PLEASE NOTE: The functionality is dependent on immediate execution of the inner function!

Answer 3

Answer №2

It is important to note that you should not attempt to return the result of geocoder.geocode directly within the codeAddress function. The result will be returned to the callback or closure provided to geocoder.geocode. Instead, you must utilize a callback function as an argument in your codeAddress function.

Attempting to return anything from the callback provided to geocoder.geocode back to geocoder.geocode itself will not serve any purpose in your application. You need to trigger a separate function within your application from the callback associated with geocoder.geocode.

You can find more information on this topic in the Geocoding Requests section of the API documentation.

Answer 4

It is important to note that you should not attempt to return the result of geocoder.geocode directly within the codeAddress function. The result will be returned to the callback or closure provided to geocoder.geocode. Instead, you must utilize a callback function as an argument in your codeAddress function.

Attempting to return anything from the callback provided to geocoder.geocode back to geocoder.geocode itself will not serve any purpose in your application. You need to trigger a separate function within your application from the callback associated with geocoder.geocode.

You can find more information on this topic in the Geocoding Requests section of the API documentation.

Passing data from a method callback to a function and returning a variable in the same function

Answer №1

Answer №2

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