Index: css/ctools.css
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/ctools/css/ctools.css,v
retrieving revision 1.3
diff -u -r1.3 ctools.css
--- css/ctools.css	22 Apr 2009 22:31:28 -0000	1.3
+++ css/ctools.css	13 Jul 2009 14:29:49 -0000
@@ -12,7 +12,8 @@
 }
 
 a.ctools-ajaxing,
-input.ctools-ajaxing {
+input.ctools-ajaxing,
+select.ctools-ajaxing {
   padding-right: 18px !important;
   background: url(../images/status-active.gif) right center no-repeat;
 }
Index: includes/ajax.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/ctools/includes/ajax.inc,v
retrieving revision 1.9
diff -u -r1.9 ajax.inc
--- includes/ajax.inc	9 Jul 2009 00:07:04 -0000	1.9
+++ includes/ajax.inc	13 Jul 2009 14:29:49 -0000
@@ -363,3 +363,61 @@
   ctools_ajax_render($commands);
 }
 
+/**
+ * Modify a form element of #type select to take ajax actions.
+ *
+ * This is a helper function to easily populate a select form element
+ * which can be used for on select change ajax functionality. By assigning
+ * a destination url to a select form element the selected value will be
+ * sent to the url via ajax when the element's onchange event fires.
+ *
+ * You would call this function on a select form element in the form
+ * function like this:
+ *
+ * @code
+ *   $form['example'] = array(
+ *     '#title' => t('Example'),
+ *     '#type' => 'select',
+ *     '#options' => array(1 => 'One', 2 => 'Two', 3 => 'Three'),
+ *     '#default_value' => 1,
+ *   );
+ *   ctools_ajax_select_change_element($form, 'example', 'example/ajax/urlpath');
+ * @endcode
+ *
+ * @param &$form
+ *   Reference to the form element. This is required to have the #id and #attribute
+ *   elements populated and to create the hidden form element for each select.
+ * @param $element_key
+ *   The array key of the select box we are going to take action on.
+ * @param $dest
+ *   The base URL that will be called with ajax when a select is changed. The call will
+ *   be in the form of $dest/{$select_value}
+ * @param $element_id
+ *   The ID to use for your select box and the hidden field.
+ * @param $type
+ *   A type to use, in case a different behavior should be attached. Defaults
+ *   to ctools-use-ajax.
+ */
+function ctools_ajax_select_change_element(&$form, $element_key, $dest, $element_id = NULL, $type = 'ctools-use-ajax') {
+  //Add ID to the form element
+  if ($element_id === NULL) {
+    //use element name as id if one wasnt specified
+    $element_id = $element_key;
+  }
+  $form[$element_key]['#id'] = $element_id;
+  
+  //Add ctools-use-ajax to the class  
+  if (!isset($form[$element_key]['#attributes']) || !array($form[$element_key]['#attributes'])) {
+    $form[$element_key]['#attributes'] = array();
+  }
+  $class = $form[$element_key]['#attributes']['class'] ? $form[$element_key]['#attributes']['class'] : '';
+  $classes = is_array($class) ? implode(' ', $class) : $class;
+  $form[$element_key]['#attributes']['class'] = "$classes $type";
+  
+  //Add hidden form element to hold base URL
+  $form["$element_id-url"] = array(
+  	'#type' => 'hidden',
+  	'#value' => $dest,
+  	'#attributes' => array('class' =>  "$element_id-url"),
+  );
+}
Index: js/ajax-responder.js
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/ctools/js/ajax-responder.js,v
retrieving revision 1.10
diff -u -r1.10 ajax-responder.js
--- js/ajax-responder.js	11 Jul 2009 18:11:36 -0000	1.10
+++ js/ajax-responder.js	13 Jul 2009 14:29:49 -0000
@@ -1,4 +1,5 @@
 // $Id: ajax-responder.js,v 1.10 2009/07/11 18:11:36 merlinofchaos Exp $
+
 /**
  * @file
  *
@@ -229,6 +230,47 @@
 };
 
 /**
+ * Generic replacement for drop down select change handler to execute ajax method.
+ */
+Drupal.CTools.AJAX.changeAJAXSelect = function () {
+  if ($(this).hasClass('ctools-ajaxing')) {
+    return false;
+  }
+  
+  var url = Drupal.CTools.AJAX.findURL(this) + "/" + $(this).find('option:selected').attr('value');
+  $(this).addClass('ctools-ajaxing');
+  var object = $(this);
+  try {
+    if (url) {
+      url.replace('/nojs/', '/ajax/');
+      $.ajax({
+        type: "POST",
+        url: url,
+        data: '',
+        global: true,
+        success: Drupal.CTools.AJAX.respond,
+        error: function() { 
+          alert("An error occurred while attempting to process " + url); 
+        },
+        complete: function() {
+          object.removeClass('ctools-ajaxing');
+        },
+        dataType: 'json'
+      });
+    }
+    else {
+      return false;
+    }
+  }
+  catch (err) {
+    alert("An error occurred while attempting to process " + url); 
+    $(this).removeClass('ctools-ajaxing');
+    return false;
+  }
+  return false;
+};
+
+/**
  * Bind links that will open modals to the appropriate function.
  */
 Drupal.behaviors.CToolsAJAX = function(context) {
@@ -241,4 +283,9 @@
   $('input.ctools-use-ajax:not(.ctools-use-ajax-processed)', context)
     .addClass('ctools-use-ajax-processed')
     .click(Drupal.CTools.AJAX.clickAJAXButton);
+
+  // Bind select
+  $('select.ctools-use-ajax:not(.ctools-use-ajax-processed)', context)
+     .addClass('ctools-use-ajax-processed')
+     .change(Drupal.CTools.AJAX.changeAJAXSelect);
 };