gistfile1.txt

<!-- THE SCRIPT -->

<?php echo do_shortcode('[gravityform id="3" name="Competition Entry" ajax="true"]'); ?>

<script type="text/javascript">
	jQuery(document).ready(function($) {
		
			var countryClass = '.dealer-country select',
				dealerClass  = '.dealer-name select';
			
			// disable dealer name before county county selected
			$(dealerClass).attr('disabled','disabled');
			
			$(countryClass).change(function(){
			    
				var countrySelect = $(this),
					country = countrySelect.val(),
			    	dealerSelect = countrySelect.parents('.gform_fields').find(dealerClass);
			           
			 	if(country != 0){
			    	
			   		dealerSelect.attr('disabled','disabled');
			        
			    	$.ajax({
						type: 'POST',
						url: '<?php echo admin_url('admin-ajax.php'); ?>',
						data: { dealerCountry : country, action: 'get_dealer_name' },
						success: function(data){
							dealerSelect.empty();
							var options = $.parseJSON(data);
							for(i=0;i<options.length;i++){
								dealerSelect.append('<option value="'+options[i].value+'">'+options[i].text+'</option>');
							}
							dealerSelect.removeAttr('disabled');
						}
			    	});
			        
			    } else {
			    
			        dealerSelect.attr('disabled','disabled');
			        $('option',dealerSelect).removeAttr('selected');
			      
			    }
			    
			});
			
	});
</script>


<!-- THE FUNCTIONS.PHP -->

<?php

// GO DEALER COUNTRY
add_filter("gform_pre_render", "populate_dropdown_dealer_country");
add_filter("gform_admin_pre_render", "populate_dropdown_dealer_country");
function populate_dropdown_dealer_country($form){

    if($form["id"] != 3)
       return $form;

    $terms = get_terms("dealer-country");

    $items = array();

    $items[] = array( "text" => __('Select country...','mission-theme'), "value" => '0' );

    foreach($terms as $term)
  	$items[] = array( "text" => $term->name, "value" => $term->slug );
    
    foreach($form["fields"] as &$field){
        if($field["id"] == 6){
            $field["cssClass"] = 'dealer-country';
            $field["choices"] = $items;
        }
	}
    return $form;
    
}

// GO DEALER NAME
add_filter("gform_pre_render", "populate_dropdown_dealer_name");
add_filter("gform_admin_pre_render", "populate_dropdown_dealer_name");
function populate_dropdown_dealer_name($form){

    if($form["id"] != 3)
       return $form;

    $dealers = get_posts(array(
    	"post_type" => "dealer",
    	"post_status" => "publish",
    	"orderby" => "title",
    	"order" => "ASC",
    	"posts_per_page"  => -1
    ));

    $items = array();

    $items[] = array( "text" => __('Select dealer...','mission-theme'), "value" => '0' );

    foreach($dealers as $dealer)
        $items[] = array( "text" => $dealer->post_title, "value" => $dealer->post_name );
      
    foreach($form["fields"] as &$field){
        if($field["id"] == 7){
			$field["cssClass"] = 'dealer-name';
			$field["choices"] = $items;
        }
	}
    return $form;
    
}

function get_dealer_name_fn(){
	$dealerCountry = $_POST['dealerCountry'];
	$dealers = get_posts(array(
        "post_type" => "dealer",
        "dealer-country" => $dealerCountry,
        "post_status" => "publish",
        "orderby" => "title",
        "order" => "ASC",
        "posts_per_page"  => -1
	));
	$items = array();
	$items[] = array( "text" => __('Select dealer...','mission-theme'), "value" => 0 );
	foreach($dealers as $dealer){
		$items[] = array( "text" => $dealer->post_title, "value" => $dealer->post_name );
	}
	echo json_encode($items);
	die;
}
add_action('wp_ajax_get_dealer_name', 'get_dealer_name_fn');
add_action('wp_ajax_nopriv_get_dealer_name', 'get_dealer_name_fn');

?>