WP Geo + Gravity Forms

add_filter('gform_pre_render', 'gravityforms_wpgeo_mashup');
function gravityforms_wpgeo_mashup($form) {
    include_once( WPGEO_DIR . 'admin/admin.php' );

    //REPLACE 1 with your actual form id
    $my_geo_form = 2;
    if($form["id"] !=$my_geo_form)
        return $form;

    // find IDs of latitude&longitude custom fields
    foreach($form["fields"] as &$field){
            if($field["postCustomFieldName"]=="_wp_geo_longitude") $field_lng = $field["id"];
            if($field["postCustomFieldName"]=="_wp_geo_latitude") $field_lat = $field["id"];
            //print_r($field);
    }

    // show map only if latitude&longitude custom fields exist
    if($field_lng && $field_lat ) :
        // load "WP Geo" plugin
        require_once( WP_PLUGIN_DIR . '/WP-Geo-3.2.dev/wp-geo.php' );
        global $wpgeo;
        $wpgeo = new WPGeo();
        $wpgeo->admin = new WPGeo_Admin();
        $zoom = 2;
        $map = $wpgeo->mapScriptsInit( 20, 0,$zoom, true, false );
        $map .='
            <input type="hidden" name="wpgeo_map_settings_zoom" id="wpgeo_map_settings_zoom" value="" />
            <input type="hidden" name="wpgeo_map_settings_type" id="wpgeo_map_settings_type" value="" />
            <input type="hidden" name="wpgeo_map_settings_centre" id="wpgeo_map_settings_centre" value="" />
            <input name="wp_geo_latitude" type="hidden" size="25" id="wp_geo_latitude" value="" />
            <input name="wp_geo_longitude" type="hidden" size="25" id="wp_geo_longitude" value="" />
            <script type="text/javascript">
                <!--
                jQuery(document).ready(function() {';

                    $map .='var my_geo_form= '.$my_geo_form.';';
                    $map .='var field_lng= '.$field_lng.';';
                    $map .='var field_lat= '.$field_lat.';';
                    $map .='
                    jQuery("#wp_geo_map").click(function(e) {

                        jQuery("#input_"+my_geo_form+"_"+field_lat).val(jQuery("#wp_geo_latitude").val());
                        jQuery("#input_"+my_geo_form+"_"+field_lng).val(jQuery("#wp_geo_longitude").val());

                    });

                });
            -->
            </script>
            <div id="wp_geo_map" style="width:auto; height:400px"></div>';

        // find ID of section with cssClass "wpgeo" and put the map into description
        foreach($form["fields"] as &$field){
                if($field["cssClass"]=="wpgeo")$field["description"].=$map;
        }
    endif;
    return $form;
}