/**
  * AJAX geocode
  */
 public static function ajaxGeocode()
 {
     // ID
     $post_id = filter_input(INPUT_POST, 'post_ID', FILTER_SANITIZE_NUMBER_INT);
     // Latitude
     $latitude = filter_input(INPUT_POST, Pronamic_Google_Maps_Post::META_KEY_LATITUDE, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
     update_post_meta($post_id, Pronamic_Google_Maps_Post::META_KEY_LATITUDE, $latitude);
     // Longitude
     $longitude = filter_input(INPUT_POST, Pronamic_Google_Maps_Post::META_KEY_LONGITUDE, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
     update_post_meta($post_id, Pronamic_Google_Maps_Post::META_KEY_LONGITUDE, $longitude);
     // Status
     $status = filter_input(INPUT_POST, Pronamic_Google_Maps_Post::META_KEY_GEOCODE_STATUS, FILTER_SANITIZE_STRING);
     update_post_meta($post_id, Pronamic_Google_Maps_Post::META_KEY_GEOCODE_STATUS, $status);
     // Result
     $result = new stdClass();
     $result->success = true;
     // Next post
     $query = new WP_Query();
     $query->query(Pronamic_Google_Maps_Admin::getGeocodeQueryArgs());
     $result->foundPosts = $query->found_posts;
     while ($query->have_posts()) {
         $query->the_post();
         $pgm = pronamic_get_google_maps_meta();
         $result->nextPost = new stdClass();
         $result->nextPost->ID = get_the_ID();
         $result->nextPost->title = get_the_title();
         $result->nextPost->address = $pgm->address;
         $result->nextPost->latitude = $pgm->latitude;
         $result->nextPost->longitude = $pgm->longitude;
     }
     $response = json_encode($result);
     header('Content-Type: application/json');
     exit($response);
     /*
     Queries to empty latitude, longitude and geocode status meta
     UPDATE wp_postmeta SET meta_value = '' WHERE meta_key IN ('_pronamic_google_maps_latitude', '_pronamic_google_maps_longitude');
     UPDATE wp_postmeta SET meta_value = '' WHERE meta_key = '_pronamic_google_maps_geocode_status';
     */
 }
<?php

$pgm = pronamic_get_google_maps_meta();
wp_nonce_field('save-post', Pronamic_Google_Maps_Maps::NONCE_NAME);
?>
<div id="pgm">
	<input id="pgm-map-type-field" name="<?php 
echo Pronamic_Google_Maps_Post::META_KEY_MAP_TYPE;
?>
" value="<?php 
echo esc_attr($pgm->mapType);
?>
" type="hidden" />
	<input id="pgm-zoom-field" name="<?php 
echo Pronamic_Google_Maps_Post::META_KEY_ZOOM;
?>
" value="<?php 
echo esc_attr($pgm->zoom);
?>
" type="hidden" />

	<table class="form-table">
		<tr>
			<th scope="row">
				<label for="pgm-active-field"><?php 
_e('Active', 'pronamic_google_maps');
?>
</label>
			</th>
			<td>
				<input id="pgm-active-field" name="<?php