diff --git a/ajax_example/ajax_example.install b/ajax_example/ajax_example.install
new file mode 100644
index 0000000..f088624
--- /dev/null
+++ b/ajax_example/ajax_example.install
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @file
+ * AJAX Examples install file schema for ajax_example_form_node_form_alter()
+ */
+
+/**
+ * Implements hook_schema().
+ */
+function ajax_example_schema() {
+  $schema['ajax_example'] = array(
+    'description' => 'Stores example settings for nodes.',
+    'fields' => array(
+      'nid' => array(
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+        'description' => 'The {node}.nid to store settings.',
+      ),
+      'example_1' => array(
+        'type' => 'int',
+        'not null' => TRUE,
+        'default' => 0,
+        'description' => 'Node Form Example 1 checkbox',
+      ),
+      'example_2' => array(
+        'type' => 'varchar',
+        'length' => 256,
+        'not null' => FALSE,
+        'default' => '',
+        'description' => 'Node Form Example 2 textfield',
+      ),
+    ),
+    'primary key' => array('nid'),
+    'foreign keys' => array(
+      'dnv_node' => array(
+        'table' => 'node',
+        'columns' => array('nid' => 'nid'),
+      ),
+    ),
+  );
+  return $schema;
+}
diff --git a/ajax_example/ajax_example.module b/ajax_example/ajax_example.module
index ca842d3..ced5aa4 100644
--- a/ajax_example/ajax_example.module
+++ b/ajax_example/ajax_example.module
@@ -547,3 +547,134 @@ function _ajax_example_get_second_dropdown_options($key = '') {
   }
 }
 
+/**
+ * Implements hook_form_FORM_ID_alter() for the node form.
+ *
+ * Adds two fields to the node form, second only appears after first is enabled.
+ */
+function ajax_example_form_node_form_alter(&$form, &$form_state, $form_id) {
+  $node = $form['#node'];
+  $form['ajax_example_1'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('AJAX Example 1'),
+    '#description' => t('Enable to show second field.'),
+    '#default_value' => $node->ajax_example['example_1'],
+    '#ajax' => array(
+      'callback' => 'ajax_example_form_node_callback',
+      'wrapper' => 'ajax-example-form-node',
+      'effect' => 'fade',
+    )
+  );
+  $form['container'] = array(
+    '#prefix' => '<div id="ajax-example-form-node">',
+    '#suffix' => '</div>',
+  );
+
+  // If the state values exist and 'ajax_example_1' state value is 1 or
+  // if the state values don't exist and 'example1' variable is 1 then
+  if (!empty($form_state['values']['ajax_example_1']) && $form_state['values']['ajax_example_1'] == 1
+      || empty($form_state['values']) && $node->ajax_example['example_1']) {
+
+    $form['container']['ajax_example_2'] = array(
+      '#type' => 'textfield',
+      '#title' => t('AJAX Example 2'),
+      '#description' => t('AJAX Example 2'),
+      '#default_value' => empty($form_state['values']['ajax_example_2']) ?
+                          $node->ajax_example['example_2'] :
+                          $form_state['values']['ajax_example_2'],
+    );
+  }
+}
+
+/**
+ * Returns changed part of the form.
+ *
+ * @return renderable array
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_form_node_callback($form, $form_state) {
+  return $form['container'];
+}
+
+/**
+ * Implements hook_node_submit().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_submit($node, $form, &$form_state) {
+  $fv = $form_state['values'];
+  // Move the new data into the node object.
+  $node->ajax_example['example_1'] = $fv['ajax_example_1'];
+  // Depending on the state of ajax_example_1 it may not exist.
+  $node->ajax_example['example_2'] = isset($fv['ajax_example_2']) ? $fv['ajax_example_2'] : '';
+}
+
+/**
+ * Implements hook_node_prepare().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_prepare($node) {
+  if (empty($node->ajax_example)) {
+    // Set default values, since this only runs when adding a new node.
+    $node->ajax_example['example_1'] = 0;
+    $node->ajax_example['example_2'] = '';
+  }
+}
+
+/**
+ * Implements hook_node_load().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_load($nodes, $types) {
+  $result = db_query('SELECT * FROM {ajax_example} WHERE nid IN(:nids)', array(':nids' => array_keys($nodes)))->fetchAllAssoc('nid');
+
+  foreach ($nodes as &$node) {
+    $node->ajax_example['example_1'] = isset($result[$node->nid]->example_1) ?
+                                       $result[$node->nid]->example_1 : 0;
+    $node->ajax_example['example_2'] = isset($result[$node->nid]->example_2) ?
+                                       $result[$node->nid]->example_2 : '';
+  }
+}
+
+/**
+ * Implements hook_node_insert().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_insert($node) {
+  db_insert('ajax_example')
+    ->fields(array(
+      'nid' => $node->nid,
+      'example_1' => $node->ajax_example['example_1'],
+      'example_2' => $node->ajax_example['example_2'],
+    ))
+    ->execute();
+}
+
+/**
+ * Implements hook_node_update().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_update($node) {
+  if (db_select('ajax_example', 'a')->fields('a')->condition('nid', $node->nid, '=')->execute()->fetchAssoc()) {
+    db_update('ajax_example')
+      ->fields(array(
+        'example_1' => $node->ajax_example['example_1'],
+        'example_2' => $node->ajax_example['example_2'],
+      ))
+      ->condition('nid', $node->nid)
+      ->execute();
+  }
+  else {
+    // Cleaner than doing it again.
+    ajax_example_node_insert($node);
+  }
+}
+
+/**
+ * Implements hook_node_delete().
+ * @see ajax_example_form_node_form_alter()
+ */
+function ajax_example_node_delete($node) {
+  db_delete('ajax_example')
+    ->condition('nid', $node->nid)
+    ->execute();
+}