To

    var Location = function() { };
    Location.prototype = {
        fill: function(item) {
            if (!Location.isStorableData(item)) {
                return;
            }
            var geoname = {
                labels: [],
                value: item[this.store]
            };

            for(var i = 0; i < this.store.length; i++) {
                this._mapItemValues(geoname, item, i);
            }
            geoname.label = geoname.labels.join(" - ");

            return geoname;
        },
        _mapItemValues: function(geoname, item, index) {
            geoname[this.store[index]] = item[this.store[index]];
            geoname.labels.push(item[this.labels[index]]);
        }
    };
    Location.isStorableData = function(item) {
        return item.fclass === City.code || item.fcode === State.code || item.fcode === Country.code;
    };
    Location.fill = function(item) {
        return new City().fill(item) || new State().fill(item) || new Country().fill(item);
    };

    var City = function() {
        this.labels = ["countryName", "toponymName", "name"];
        this.store = ["countryCode", "adminCode1", "name"];
        this.value = "name";
        this.code = "P";
    };
    City.prototype = new Location();

    var State = function() {
        this.labels = ["countryName", "toponymName"];
        this.store = ["countryCode", "adminCode1"];
        this.value = "adminCode1";
        this.code = "ADM1";
    };
    State.prototype = new Location();

    var Country = function() {
        this.labels = ["countryName"];
        this.store = ["countryCode"];
        this.value = "countryCode";
        this.code = "PCLI";
    };
    Country.prototype = new Location();

    //
    // Filter
    //
    var LocationAutocompleteFilter = function($el) {
        this.$el = $el;
    };
    LocationAutocompleteFilter.prototype = {
        start: function(selectCallback) {
            var self = this;
            this.$el.autocomplete({
                minLength: 3,
                source: function(request, response) {
                    self.remoteSource(request.term, response);
                },
                open: function() {
                    $(this).removeClass("ui-corner-all").addClass("ui-corner-top");
                },
                focus: function(event, ui) {
                    self.$el.val(ui.item.label);
                    return false;
                },
                select: function(event, ui) {
                    self.fillDOMWith(ui.item.label, {
                        city: ui.item.name,
                        state: ui.item.adminCode1,
                        country: ui.item.countryCode
                    });
                    if (selectCallback) {
                        selectCallback();
                    }
                    return false;
                },
                change: function() {
                    if (self.$el.val() === "") {
                        self.fillDOMWith("");
                    }
                    return false;
                },
                close: function() {
                    $(this).removeClass("ui-corner-top").addClass("ui-corner-all");
                }
            });
        },
        remoteSource: function(searchTerm, fillWith) {
            $.ajax({
                url: "//ws.geonames.org/searchJSON",
                dataType: "jsonp",
                data: {
                    maxRows: 15,
                    q: searchTerm,
                    username: this.$el.data('username'),
                    lang: this.$el.data('locale')
                },
                success: function(data) {
                    fillWith( $.map(data.geonames, function(item) {
                        return Location.fill(item);
                    }) );
                }
            });
        },
        fillDOMWith: function(elValue, siblingsValues) {
            this.$el.val(elValue);
            this.$el.siblings("[name='group[city]']").val(siblingsValues.city || elValue);
            this.$el.siblings("[name='group[state]']").val(siblingsValues.state || elValue);
            this.$el.siblings("[name='group[country]']").val(siblingsValues.country || elValue);
        }
    };

    window.LocationAutocompleteFilter = LocationAutocompleteFilter;