How to Get the value from function in JQuery

debugcn Published at Dev

user3654570

Does someone know how can I return the value from a function that contains getJSON The issue is I'm trying to call that function from other function in order to get the value but its all the time undefined!!!! how can I make it work??!?

function TranslateLatLanToAddress(LatLng) {
            var latlng = "34.1574183,-118.437125";
            var url = "http://maps.googleapis.com/maps/api/geocode/json?latlng=" + latlng + "&sensor=false";
            $ = jQuery;
            $.getJSON(url, function (data) {
                for (var i = 0; i < data.results.length; i++) {
                    var address = data.results[i].formatted_address;
                    //                 var address = data.results[i].address_components[4].long_name + data.results[i].address_components[6].short_name;
                    //alert(address);
                    //                alert(address);
                    return false;
                }
            });
        }



  function GetVal()
    {
    var retVal =TranslateLatLanToAddress(LatLng);
    alert(retVal); //Its undefined!!!
    }

jasonscript

AJAX calls are asynchronous. This means that while the request is being sent to the server (Google Maps) your script will continue.

This is a good thing because it means your page will continue to load while waiting for the result.

To use this to your advantage, you can use callback methods.

function TranslateLatLanToAddress(LatLng, fnCallback) {
    var latlng = "34.1574183,-118.437125";
    var url = "http://maps.googleapis.com/maps/api/geocode/json?latlng=" + latlng + "&sensor=false";
    $ = jQuery;
    $.getJSON(url, function (data) {                                // getJSON is asynchronous
        for (var i = 0; i < data.results.length; i++) {
            var address = data.results[i].formatted_address;        // get the result
            fnCallback(address);                                    // execute the callback from the parameters
        }
    });
}


function GetVal() {
    TranslateLatLanToAddress(LatLng, function(address){             // note the new callback that takes an address as a parameter
        alert(address);                                             // the callback is fired from within the SUCCESS method and now address has a value
    });
}

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