- Patch #825330 by rfay, katbailey: make book module use standard D7 AJAX forms techniques.

modules/book/book.module

@@ -189,13 +189,6 @@ function book_menu() {
     'type' => MENU_CALLBACK,
     'file' => 'book.pages.inc',
   );
-  $items['book/js/form'] = array(
-    'page callback' => 'book_form_update',
-    'delivery callback' => 'ajax_deliver',
-    'access arguments' => array('access content'),
-    'type' => MENU_CALLBACK,
-    'file' => 'book.pages.inc',
-  );
 
   return $items;
 }
@@ -481,6 +474,8 @@ function _book_parent_select($book_link) {
       '#description' => t('The parent page in the book. The maximum depth for a book and all child pages is !maxdepth. Some pages in the selected book may not be available as parents if selecting them would exceed this limit.', array('!maxdepth' => MENU_MAX_DEPTH)),
       '#options' => book_toc($book_link['bid'], $book_link['parent_depth_limit'], array($book_link['mlid'])),
       '#attributes' => array('class' => array('book-title-select')),
+      '#prefix' => '<div id="edit-book-plid-wrapper">',
+      '#suffix' => '</div>',
     );
   }
 
@@ -491,8 +486,11 @@ function _book_parent_select($book_link) {
  * Build the common elements of the book form for the node and outline forms.
  */
 function _book_add_form_elements(&$form, &$form_state, $node) {
-  // Need this for AJAX.
-  $form_state['cache'] = TRUE;
+  // If the form is being processed during the AJAX callback of our book bid
+  // dropdown, then $form_state will hold the value that was selected.
+  if (isset($form_state['values']['book'])) {
+    $node->book = $form_state['values']['book'];
+  }
 
   $form['book'] = array(
     '#type' => 'fieldset',
@@ -557,7 +555,7 @@ function _book_add_form_elements(&$form, &$form_state, $node) {
     '#weight' => -5,
     '#attributes' => array('class' => array('book-title-select')),
     '#ajax' => array(
-      'path' => 'book/js/form',
+      'callback' => 'book_form_update',
       'wrapper' => 'edit-book-plid-wrapper',
       'effect' => 'fade',
       'speed' => 'fast',
@@ -565,6 +563,19 @@ function _book_add_form_elements(&$form, &$form_state, $node) {
   );
 }
 
+/**
+ * Renders a new parent page select element when the book selection changes.
+ *
+ * This function is called via AJAX when the selected book is changed on a node
+ * or book outline form.
+ *
+ * @return
+ *   The rendered parent page select element.
+ */
+function book_form_update($form, $form_state) {
+  return $form['book']['plid'];
+}
+
 /**
  * Common helper function to handles additions and updates to the book outline.
  *

modules/book/book.pages.inc

@@ -217,35 +217,3 @@ function book_remove_form_submit($form, &$form_state) {
   }
   $form_state['redirect'] = 'node/' . $node->nid;
 }
-
-/**
- * Renders a new parent page select element when the book selection changes.
- *
- * This function is called via AJAX when the selected book is changed on a node
- * or book outline form. It creates a new parent page select element, adds it
- * to the cached form, and then returns the rendered element so it can be
- * displayed on the form.
- *
- * @return
- *   The rendered parent page select element.
- */
-function book_form_update() {
-  // Load the form based upon the $_POST data sent via the ajax call.
-  list($form, $form_state) = ajax_get_form();
-
-  $bid = $_POST['book']['bid'];
-
-  // Validate the bid.
-  if (isset($form['book']['bid']['#options'][$bid])) {
-    $book_link = $form['#node']->book;
-    $book_link['bid'] = $bid;
-    // Get the new options and update the cache.
-    $form['book']['plid'] = _book_parent_select($book_link);
-    form_set_cache($form['values']['form_build_id'], $form, $form_state);
-
-    // Build the new select element and return it.
-    $form_state = array();
-    $form = form_builder($form['form_id']['#value'], $form, $form_state);
-    return $form['book']['plid'];
-  }
-}