Non capisco cosa non funzioni.. :(

[Onaxxis]

Buona sera a tutti...


ho instalato questo plugin per wordpress che tramite ajax salva ogni 10 secondi il form di Gravity Forms qualora restasse inutilizzato per poter riprendere la compilazione in un momento successivo..

Salvare, salva.. quello che non funziona è che il pulsante dovrebbe avere queste 3 visualizzazini:

Salva
Salvataggio in corso...
Salvato

Il tutto s'intoppa dopo aver cliccato su salva.. appare Salvataggio in corso... che dovrebbe restare per 3 secondi per poi far apparire la scritta Salvato (questo non accade).

Il codice è il seguente:

<?php
/*
Plugin Name: Gravity Forms - Data Persistence Reloaded - Save Button
Description: Extends the 'Gravity Forms - Data Persistence Reloaded' plugin to add a save button to the form footer - allowing users to instantly save their form, and providing the reassurance that the form has been saved.
Version: 1.1
Author: Adrian Gordon
License: GPL2
*/

add_action('admin_notices', array('ITSP_GF_DPR_Save_Button', 'admin_warnings'), 20);

if (!class_exists('ITSP_GF_DPR_Save_Button')) {
    class ITSP_GF_DPR_Save_Button
    {
		private static $name = 'Gravity Forms - Data Persistence Reloaded - Save Button';
		private static $slug = 'itsp_gp_drp_save_button';
		
		/**
         * the save button template
         */
		public static $save_button =  "<input type='button' value='Salva' class='button gform_next_button itsg_gf_save_button' onclick='itsg_gf_save_button_ajax_function();'> "; 

        /**
         * Construct the plugin object
         */
		 public function __construct()
        {
            // register actions
            if ((self::is_gravityforms_installed())) {
			// start the plugin
			add_action('gform_enqueue_scripts', array(&$this,'itsg_gf_save_button_button_ajax'), 90, 3);
			
			}
        } // END __construct
		
		/**
         * Place the save button before the 'Next' button
         */
		function itsg_gf_next_button_markup( $next_button, $form ) {
			$save_button = self::$save_button;
			return $save_button.$next_button;
			
			

		} // END my_next_button_markup
		
		/**
         * Place the save button before the 'Submit' button
         */
		function itsg_gf_submit_button_markup( $submit_button, $form ) {
			$save_button = self::$save_button;
			return $save_button.$submit_button;
			
			
		} // END my_submit_button_markup

		/**
         * If Ajax data persistence is enabled, user is logged in and current form is not a user registration form - enqueue javascript and buttons
         */
		public function itsg_gf_save_button_button_ajax($form, $is_ajax) {
	
			if($form['ri_gfdp_persist'] == 'ajax' && is_user_logged_in() && !self::is_user_registration_form($form)) {
			
				add_action('wp_footer', array(&$this,'itsg_gf_save_button_ajax'));
				add_filter( 'gform_next_button', array(&$this,'itsg_gf_next_button_markup'), 10, 2 );
				add_filter( 'gform_submit_button', array(&$this,'itsg_gf_submit_button_markup'), 10, 2 );
				
			}
		} // END itsg_gf_save_button_button_ajax
		
		/**
         * Ajax to handle button press - 
		 *     activates the 'salva' command, 
		 *     sets the button value to 'Salvato' whilst being saved, 
		 *     sets the button value to 'Salvataggio in corso...' for three seconds to confirm to the user that the save completed,
		 *     sets the button value back to 'Salva'
         */
		public static function itsg_gf_save_button_ajax() {
		?>
				<script type="text/javascript" >
				function itsg_gf_save_button_ajax_function() {
				jQuery('.gform_body').find('.itsg_gf_save_button').prop('value', '<?php _e('Salvataggio attivo...', self::$slug); ?>');
				
					changed = true; 
					gfdp_ajax();
					jQuery(document).ajaxComplete(function(event, request, settings ) {
						if ( settings.url === '<?php echo admin_url('admin-ajax.php'); ?>' && request.responseText === 'Salvato' ) {
							itsg_gf_save_button_ajax_reset_button_function();
						}
					});
				}
								
				function itsg_gf_save_button_ajax_reset_button_function() {
					jQuery('.gform_body').find('.itsg_gf_save_button').prop('value', '<?php _e('Salvato', self::$slug); ?>');
					setTimeout(function(){
						jQuery('.gform_body').find('.itsg_gf_save_button').prop('value', '<?php _e('Salva', self::$slug); ?>');
					}, 3000);
				}
				
				</script> <?php
		} // END itsg_gf_save_button_ajax

		/*
         * Warning message if Gravity Forms is not installed and enabled
         */
		public static function admin_warnings() {
			if ( !self::is_gravityforms_installed() ) {
				$gf_message = __('Requires Gravity Forms to be installed.', self::$slug);
			}
			if ( !self::is_dpr_installed() ) {
				$gfdpr_message = __('Requires Gravity - Data Persistence Reloaded to be installed.', self::$slug);
			}
			
			if (!empty($gf_message)) {
			?>
			<div class="error">
				<p>
					<?php _e('The plugin ', self::$slug); ?><strong><?php echo self::$name; ?></strong> <?php echo $gf_message; ?><br />
					<?php _e('Please ',self::$slug); ?><a href="http://www.gravityforms.com/"><?php _e(' download the latest version',self::$slug); ?></a><?php _e(' of Gravity Forms and try again.',self::$slug) ?>
				</p>
			</div>
			<?php
			}
			
			if (!empty($gfdpr_message)) {
			?>
			<div class="error">
				<p>
					<?php _e('The plugin ', self::$slug); ?><strong><?php echo self::$name; ?></strong> <?php echo $gfdpr_message; ?><br />
					<?php _e('Please ',self::$slug); ?><a href="https://wordpress.org/plugins/gravity-forms-data-persistence-add-on-reloaded/"><?php _e(' download the latest version',self::$slug); ?></a><?php _e(' of Gravity Forms Data Persistence Add-On Reloaded and try again.',self::$slug) ?>
				</p>
			</div>
			<?php
			} 
			
		} // END admin_warnings

		/*
         * Check if GF is installed
         */
        private static function is_gravityforms_installed()
        {
            return class_exists('GFAPI');
        } // END is_gravityforms_installed
		
		/*
         * Check if Gravity Forms - Data Persistence Reloaded is installed
         */
        private static function is_dpr_installed() 
        {
            return function_exists('ri_gfdp_ajax');
        } // END is_dpr_installed
		
		private static function is_user_registration_form($form)
		{
		global $wpdb;
		
		$form_id = $form[id];
		$table_user_reg = $wpdb->prefix . "rg_userregistration";
		
		$sql = "SELECT userreg.form_id
		FROM $table_user_reg as userreg 
		WHERE userreg.form_id = $form_id";
		
		$results = $wpdb->get_results($sql);
		
		if (!empty($results)) {
			return true;
			} 
		}
		
	}
    $ITSP_GF_DPR_Save_Button = new ITSP_GF_DPR_Save_Button();
}

?>

Ringrazio anticipatamente chiunque possa dirmi come risolvere il problema.