Returning values from Callback

Question

I don\'t have any previous javascript experience.

I\'m trying to implement the following function which I wish to use to return the values lat and lng:

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Answer 1

Declare variables lat and lng outside callback function.

Answer 2

In header section add google library:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>

correct syntax errors and then start the function: DEMO

CODE (with jquery onload):

var lat = "";
var lng = "";

function getLatLng(callback) {
    lat = callback.lat();
    lng = callback.lng();
    alert(lat +" "+lng);
}

$(function() {
    var geocoder = new google.maps.Geocoder()

    geocoder.geocode({
        address: "SE-17270 Sverige"
    }, function(locResult) {
        getLatLng(locResult[0].geometry.location);
    });
});

Answer 3

you could use global variables or return the values in an array for instance:

global variables method:

lat = "";
lng = "";

function get_address() {
    var geocoder = new google.maps.Geocoder()

    geocoder.geocode({ address: "SE-17270 Sverige"}, 
    function(locResult) {

    lat = locResult[0].geometry.location.lat();
    lng = locResult[0].geometry.location.lng();
    alert(lat);
    alert(lng);
    })
}

array method:

function get_address() {
    var geocoder = new google.maps.Geocoder()

    geocoder.geocode({ address: "SE-17270 Sverige"}, 
    function(locResult) {

    var lat = locResult[0].geometry.location.lat();
    var lng = locResult[0].geometry.location.lng();

    thearray = [];
    thearray.push(lat);
    thearray.push(lng);
    return thearray;
    })
}

Answer 4

Use a callback to handle the geocoding results:

function myCallback(lat, lng) {
  // Process lat and lng.
}

function get_address(callback) {
    var geocoder = new google.maps.Geocoder()

    geocoder.geocode({ address: "SE-17270 Sverige"}, 
      function(locResult) {
          var lat = locResult[0].geometry.location.lat();
          var lng = locResult[0].geometry.location.lng();
          callback(lat, lng);
      }
    );
}
....
get_address(myCallback);