Issue #589440 by Boobaa, JanZ, pwolanin, mlncn, TomiMikola, willmoy, marcp et all: Fixed Reordering fails with more than 31 book pages in a book.

core/modules/book/book.admin.inc

@@ -174,10 +174,6 @@ function _book_admin_table($node, &$form) {
  * @see book_admin_edit()
  */
 function _book_admin_table_tree($tree, &$form) {
-  // The delta must be big enough to give each node a distinct value.
-  $count = count($tree);
-  $delta = ($count < 30) ? 15 : intval($count / 2) + 1;
-
   foreach ($tree as $data) {
     $form['book-admin-' . $data['link']['nid']] = array(
       '#item' => $data['link'],
@@ -191,9 +187,12 @@ function _book_admin_table_tree($tree, &$form) {
         '#size' => 40,
       ),
       'weight' => array(
-        '#type' => 'weight',
+        // Using a textfield and a validator instead of a simple weight select
+        // to avoid unnecessarily oversized HTML for books with hundreds of
+        // pages.
+        '#type' => 'textfield',
+        '#element_validate' => array('element_validate_integer'),
         '#default_value' => $data['link']['weight'],
-        '#delta' => max($delta, abs($data['link']['weight'])),
         '#title' => t('Weight for @title', array('@title' => $data['link']['title'])),
         '#title_display' => 'invisible',
       ),

core/modules/book/book.module

@@ -512,10 +512,12 @@ function _book_add_form_elements(&$form, &$form_state, $node) {
 
   // @see _book_admin_table_tree(). The weight may be larger than 15.
   $form['book']['weight'] = array(
-    '#type' => 'weight',
+    // Using a textfield and a validator instead of a simple weight select to
+    // avoid unnecessarily oversized HTML for books with hundreds of pages.
+    '#type' => 'textfield',
+    '#element_validate' => array('element_validate_integer'),
     '#title' => t('Weight'),
     '#default_value' => $node->book['weight'],
-    '#delta' => max(15, abs($node->book['weight'])),
     '#weight' => 5,
     '#description' => t('Pages at a given level are ordered first by weight and then by title.'),
   );