Dropdown Country City

<?php
/**
 * PHP Grid Component
 *
 * @author Abu Ghufran <gridphp@gmail.com> - http://www.phpgrid.org
 * @version 1.5.2
 * @license: see license.txt included in package
 */

// include db config
include_once("../../config.php");

// set up DB
mysql_connect(PHPGRID_DBHOST, PHPGRID_DBUSER, PHPGRID_DBPASS);
mysql_select_db(PHPGRID_DBNAME);

// include and create object
include(PHPGRID_LIBPATH."inc/jqgrid_dist.php");

$g = new jqgrid();

$col = array();
$col["title"] = "Id"; // caption of column
$col["name"] = "id";
$col["width"] = "10";
$cols[] = $col;

$col = array();
$col["title"] = "Country";
$col["name"] = "country_id";
$col["dbname"] = "store.country_id";
$col["width"] = "100";
$col["align"] = "left";
$col["search"] = true;
$col["editable"] = true;
$col["edittype"] = "select"; // render as select
# fetch data from database, with alias k for key, v for value

# on change, update other dropdown
$str = $g->get_dropdown_values("select distinct id as k, name as v from country");
$col["editoptions"] = array(
            "value"=>":;".$str,
            "onchange" => array(    "sql"=>"select distinct id as k, name as v from state WHERE country_id = '{country_id}'",
                                    "update_field" => "state_id" )
                            );

$col["formatter"] = "select"; // display label, not value
$col["stype"] = "select"; // enable dropdown search
$col["searchoptions"] = array("value" => ":;".$str);

$cols[] = $col;

$col = array();
$col["title"] = "State";
$col["name"] = "state_id";
$col["dbname"] = "store.state_id";
$col["width"] = "100";
$col["search"] = true;
$col["editable"] = true;
$col["edittype"] = "select"; // render as select
$str = $g->get_dropdown_values("select id as k, name as v from state");
$col["editoptions"] = array(
            "value"=>$str,
            "onchange" => array(    "sql"=>"select distinct id as k, name as v from city WHERE state_id = '{state_id}'",
                                    "update_field" => "city_id" )
                            );

$col["editoptions"]["onload"]["sql"]="select distinct id as k, name as v from state WHERE country_id = '{country_id}'";

$col["formatter"] = "select"; // display label, not value
$col["stype"] = "select"; // enable dropdown search
$col["searchoptions"] = array("value" => ":;".$str);

$cols[] = $col;

$col = array();
$col["title"] = "City";
$col["name"] = "city_id";
$col["dbname"] = "store.city_id";
$col["width"] = "100";
$col["search"] = true;
$col["editable"] = true;
$col["edittype"] = "select"; // render as select
$str = $g->get_dropdown_values("select id as k, name as v from city");
$col["editoptions"] = array(
            "value"=>$str,
                            );

$col["editoptions"]["onload"]["sql"]="select distinct id as k, name as v from city WHERE state_id = '{state_id}'";

$col["formatter"] = "select"; // display label, not value
$col["stype"] = "select"; // enable dropdown search
$col["searchoptions"] = array("value" => ":;".$str);

$cols[] = $col;


$col = array();
$col["title"] = "Store";
$col["name"] = "name";
$col["dbname"] = "store.name";
$col["width"] = "50";
$col["editable"] = true; // this column is editable
$col["editoptions"] = array("size"=>20); // with default display of textbox with size 20
$col["editrules"] = array("required"=>true); // and is required
$cols[] = $col;

$grid["sortname"] = 'id'; // by default sort grid by this field
$grid["sortorder"] = "asc"; // ASC or DESC
$grid["caption"] = "Stores Location - Country/State/City wise"; // caption of grid
$grid["autowidth"] = true; // expand grid to screen width
$grid["add_options"]["afterShowForm"] = "function(){ setup_fields(); }";
$grid["edit_options"]["afterShowForm"] = "function(){ setup_fields(); }";

$g->set_options($grid);

$g->set_actions(array(
                        "add"=>true, // allow/disallow add
                        "edit"=>true, // allow/disallow edit
                        "delete"=>true, // allow/disallow delete
                        "rowactions"=>true, // show/hide row wise edit/del/save option
                        "autofilter" => true, // show/hide autofilter for search
                    )
                );

$g->select_command = "SELECT store.id, store.country_id, store.state_id, store.city_id, store.name from store
                        left JOIN country on country.id = store.country_id
                        INNER JOIN city on city.id = store.city_id
                        INNER JOIN state on state.id = store.state_id
                        ";

// this db table will be used for add,edit,delete
$g->table = "store";

// pass the cooked columns to grid
$g->set_columns($cols);

// generate grid output, with unique grid name as 'list1'
$out = $g->render("list1");
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
<head>
    <link rel="stylesheet" type="text/css" media="screen" href="../../lib/js/themes/redmond/jquery-ui.custom.css"></link>
    <link rel="stylesheet" type="text/css" media="screen" href="../../lib/js/jqgrid/css/ui.jqgrid.css"></link>

    <script src="../../lib/js/jquery.min.js" type="text/javascript"></script>
    <script src="../../lib/js/jqgrid/js/i18n/grid.locale-en.js" type="text/javascript"></script>
    <script src="../../lib/js/jqgrid/js/jquery.jqGrid.min.js" type="text/javascript"></script>
    <script src="../../lib/js/themes/jquery-ui.custom.min.js" type="text/javascript"></script>
</head>
<body>
    <div style="margin:10px">
    <?php echo $out?>
    </div>

    <script>
    function setup_fields()
    {
        if ($('#country_id').val() == '')
        {
            $('#tr_city_id').hide();
            $('#tr_state_id').hide();
        }

        $('#country_id').change(function(){
            if ($('#country_id').val() == '')
            {
                $('#tr_city_id').hide();
                $('#tr_state_id').hide();
            }
            else
            {
                $('#tr_city_id').show();
                $('#tr_state_id').show();
            }
        });
    }
    </script>
</body>
</html>