Process taken from https://gist.github.com/gabesumner/1801479

geocoding-process.js

// Google Maps doesn't like line-breaks, remove them 
CurrentAddress = CurrentAddress.replace(/\n/g, "");

// Create a new Google geocoder
var geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'address': CurrentAddress }, function (results, status) {

    // The code below only gets run after a successful Google service call has completed.  
    // Because this is an asynchronous call, the validator has already returned a 'true' result
    // to supress an error message and then cancelled the form submission.  The code below 
    // needs to fetch the true validation from the Google service and then re-execute the 
    // jQuery form validator to display the error message.  Futhermore, if the form was 
    // being submitted, the code below needs to resume that submit.

    // Google reported a valid geocoded address
    if (status == google.maps.GeocoderStatus.OK) {

        // Get the formatted Google result
        var address = results[0].formatted_address;

        // Count the commas in the fomatted address.   
        // This doesn't look great, but it helps us understand how specific the geocoded address
        // is.  For example, "CA" will geocde to "California, USA".  
        numCommas = address.match(/,/g).length;

        // A full street address will have at least 3 commas.  Alternate techniques involve 
        // fetching the address_components returned by Google Maps.  That code looks even more ugly.
        if (numCommas >= 3) {

            // Replace the first comma found with a line-break
            address = address.replace(/, /, "\n");

            // Remove USA from the address (remove this, if this is important to you)
            address = address.replace(/, USA$/, "");

            // Check for the map_canvas, if it exists then position the Google Map
            if ($("#map_canvas").exists()) {
                $("#map_canvas").show();
                Map("map_canvas", results[0].geometry.location);
            }

            // Set the textarea value to the geocoded address
            $(element).val(address);

            // Cache this latest result
            $(element).data("LastAddressValidated", address);

            // We have a valid geocoded address
            $(element).data("IsValid", true);
        } else {
            // Google Maps was able to geocode the address, but it wasn't specific
            // enough (not enough commas) to be a valid street address.
            $(element).data("IsValid", false);
        }

        // Otherwise the address is invalid
    } else {
        $(element).data("IsValid", false);
    }

    // We're no longer in the midst of validating
    $(element).data("IsChecking", false);

    // Get the parent form element for this address field
    var form = $(element).parents('form:first');

    // This code is being run after the validation for this field,
    // if the form was being submitted before this validtor was 
    // called then we need to re-submit the form.
    if ($(element).data("SubmitForm") == true) {
        form.submit();
    } else {
        // Re-validate this property so we can return the result.
        form.validate().element(element);
    }
});