Drupal 7 AHAH/AJAX issue - support

10 Sep 2012


      Hi List
I am trying to learn ajax stuff in Drupal 7.
I want to have a simple questionnaire form. Where I will have a single
textfield.
In that text field one will type a question category, and if he wants to
type more question categories, user need to click a  button "Add More
Categories".
Please see link http://www.netcloudsystems.com/?q=questionnaire/form/manage
The whole source code is at the end of this email.  When ajax callback
fires, I want to remember how many textfields I need to add, so that when a
section of form is updated in _form() hook, I can according add those many
textfields.
I am trying to manage that using a variable "$all_categories" and form
element $form['all_categories']  (of type value).
I tried many options, always I find $all_categories value is 1.   So I am
unable to add more textfields.
My observation is whatever I set in ajax callback, in _form hook api, I
find value is lost.
Kindly guide me what I am missing.
Best Regards
Kamal
*NECS, Bangalore*
*<?php*
*function questionnaire_menu() {
 $items = array();
$items['questionnaire/form/manage'] = array(
 'title' => t('Manage questions'),
 'page callback' => 'questionnaire_form',
 'access arguments' => array('question manage'),
 'type' => MENU_SUGGESTED_ITEM,
 );*
*  return $items;
}*
*function questionnaire_permission()
{
  return array(
   'question manage' => array(
   'title' => t('Question management'),
   'description' => t('Provides question management capability'),
   ),
  );
}*
**
**
*function questionnaire_form()
{
 return drupal_get_form('questionnaire_my_form');
}*
**
**
*function questionnaire_my_form($form, &$form_state)
{
  $form_state['cache'] = TRUE;
$all_categories = !empty($form_state['values']['all_categories']) ?
$form_state['values']['all_categories'] : 1;  *
**
*  $form['all_categories'] = array(
   '#type' => 'value',
   '#default_value' => $all_categories,
   '#value' => $all_categories);*
**
*   // The prefix/suffix provide the div that we're replacing, named by
   // #ajax['wrapper'] above.
   $form['category_fieldset'] = array(
        '#title' => t("Questions Categories"),
        '#prefix' => '<div id="category-div">',
        '#suffix' => '</div>',
        '#type' => 'fieldset',
        '#description' => t('Please enter the question categories'),
   );*
*   for ($i=1; $i<= $all_categories ; $i++)
   {
      $key = 'ctg' . $i;
      $form['category_fieldset']['category'][$key] = array(
         '#type' => 'textfield',
         '#title' => "Question category $i",
         );
    }  *
*   $form['category_fieldset']['add_more_category'] = array(
        '#type' => 'submit',
        '#value' => t('Add More Categories'),
        '#ajax' => array(
          'callback' => 'questionnaire_category_callback',
          'wrapper' => 'category-div',
          'method' => 'replace',
          'effect' => 'fade',
          ),
     );
$form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Submit'),
        );
return $form;
}   *
**
*function questionnaire_category_callback($form, &$form_state)
{
  $form_state['values']['all_categories'] =
$form_state['values']['all_categories'] + 1;
  return $form['category_fieldset'];
}*
**
*?>*