add some user feedback to ajax result

booking.emails_admin.inc

@@ -375,6 +375,7 @@ function booking_manual_email_form($form, &$form_state)
     '#title' => t('Preselect Attendees'),
     '#options' => $preselection_options,
     '#default_value' => '---',
+    '#suffix' => '<div id="booking_email_preselection_suffix_wrapper"></div>',
     '#ajax' => array(
       'event' => 'change',
       'callback' => '_booking_email_get_default_selection_callback',
@@ -529,6 +530,8 @@ function _booking_email_get_default_selection_callback($form, $form_state) {
   );
   
   $output_html = render($replacementform_data['booking-email-default-ids']);
+  $feedback_html = t("<div id=\"booking_email_preselection_suffix_wrapper\">Number of people selected: <b>:num</b></div>",
+    array(':num' => count($defaults)));
   //watchdog('booking_debug', "<pre>Manual Email ajax html\n@info</pre>", array('@info' => print_r( $output_html, true)));
   
   //return a sequence of commands to run
@@ -536,6 +539,7 @@ function _booking_email_get_default_selection_callback($form, $form_state) {
     '#type' => 'ajax',
     '#commands' => array(
       ajax_command_replace("#booking_email_default_ids_wrapper", $output_html),
+      ajax_command_replace("#booking_email_preselection_suffix_wrapper", $feedback_html),
       // This will call the command bookingEmailIDs in our custom JS file.
       array('command' => 'bookingAjaxCheckboxes', 
         'formDataElement' => 'booking_email_default_ids', //name of the hidden form element that contains the json data