una/template/location_field_plain_auto.html

<div class="bx-form-input-location-auto-cont bx-clearfix">
    <div>__input__</div>
    <div id="__id_status__" class="bx-def-padding-sec-left">
        <span>__location_string__</span>
        <div id="__id_status__copyright" class="bx-def-margin-thd-top bx-def-font-small bx-def-font-grayed"></div>
    </div>    
</div>

<input type="hidden" name="__name___lat" value="__lat__" />
<input type="hidden" name="__name___lng" value="__lng__" />
<input type="hidden" name="__name___country" value="__country__" />
<input type="hidden" name="__name___state" value="__state__" />
<input type="hidden" name="__name___city" value="__city__" />
<input type="hidden" name="__name___zip" value="__zip__" />
<input type="hidden" name="__name___street" value="__street__" />
<input type="hidden" name="__name___street_number" value="__street_number__" />

<script>
    var eForm = $('#__form_id__');
    eForm.find('input[name=__name__][type=checkbox]').on('change', function () {
        var _self = this;
        var callbackOnLocationReset = function (error) {
            eForm.find('[name="__name___lat"]').val('');
            eForm.find('[name="__name___lng"]').val('');
            eForm.find('#__id_status__ span').html("<bx_text_js:_sys_location_field_label />");
            $(_self).prop("checked", false);
            $(_self).parents('.bx-switcher-cont').removeClass('on').addClass('off');
        }

        var callbackOnLocationSucess = function (position) {

            var iTimeout = 200;
            if ('undefined' !== typeof(glBxLocationFieldPlainAutoGeocodingRequest) && glBxLocationFieldPlainAutoGeocodingRequest) { // cancel previous request
                clearTimeout(glBxLocationFieldPlainAutoGeocodingRequest);
                glBxLocationFieldPlainAutoGeocodingRequest = null;
                iTimeout = 1000;
            }

            glBxLocationFieldPlainAutoGeocodingRequest = setTimeout(function () {
                $.getJSON('__nominatim_server__/reverse?lat=' + encodeURIComponent(position.coords.latitude) + '&lon=' + encodeURIComponent(position.coords.longitude) + '&format=json&addressdetails=1&email=__nominatim_email__', function (oResult) {

                    glBxLocationFieldPlainAutoGeocodingRequest = false;

                    if (('object' === typeof oResult) && ('undefined' !== typeof oResult.display_name) && ('undefined' !== typeof oResult.address) && ('undefined' !== typeof oResult.address.country_code)) {
                        eForm.find('[name="__name___lat"]').val(position.coords.latitude);
                        eForm.find('[name="__name___lng"]').val(position.coords.longitude);

                        eForm.find('[name="__name___country"]').val(oResult.address.country_code.toUpperCase());

                        if ('undefined' !== typeof oResult.address.suburb)
                            eForm.find('[name="__name___city"]').val(oResult.address.suburb);
                        else if ('undefined' !== typeof oResult.address.town)
                            eForm.find('[name="__name___city"]').val(oResult.address.town);
                        else if ('undefined' !== typeof oResult.address.city)
                            eForm.find('[name="__name___city"]').val(oResult.address.city);

                        var oMap = {
                            'postcode': '__name___zip',
                            'state': '__name___state',
                            'road': '__name___street',
                            'house_number': '__name___street_number',
                        }
                        $.each(oMap, function (i) {
                            if ('undefined' !== typeof oResult.address[i])
                                eForm.find('[name="' + this + '"]').val(oResult.address[i]);
                        });

                        eForm.find('#__id_status__ span').html(oResult.display_name);
                        if  ('undefined' !== typeof oResult.licence)
                            eForm.find('#__id_status__copyright').html(oResult.licence);

                    } 
                    else {
                        eForm.find('#__id_status__ span').html(position.coords.latitude + ', ' + position.coords.longitude);
                    }
                });
            }, iTimeout);


        }

        if ($(this).is(':checked')) {
            eForm.find('#__id_status__ span').html('<bx_text_js:_sys_location_determining />');
            if (navigator.geolocation)
                navigator.geolocation.getCurrentPosition(callbackOnLocationSucess, callbackOnLocationReset);
            else
                eForm.find('#__id_status__ span').html('<bx_text_js:_sys_location_geolocation_not_supported_by_browser />');
        }
        else {
            callbackOnLocationReset();
        }
    });
</script>