Tip : How to display views depended on what value you get by an ahah form

It's based on ahah_helper module. In case you want to display a view based on what value you get by an ahah form ( select box ). This value can be passed to the view, as argument.

function standings_form($form_state) {

   $form = array();

   // Register the form with ahah_helper so we can use it. Also updates
   // $form_state['storage'] to ensure it contains the latest values that have
   // been entered, even when the form item has temporarily been removed from
   // the form. So if a form item *once* had a value, you *always* can retrieve
   // it.
   ahah_helper_register($form, $form_state);

  // Determine the default value of the 'usage' select. When nothing is stored
  // in $form_state['storage'] yet, it's the form hasn't been submitted yet,
  // thus it's the first time the form is being displayed. Then, we set the
  // default to 'company'.

  if (!isset($form_state['storage']['groupset']['dropdown'])) {
   $group_nid = 1;
  }
  else {
   $group_nid = $form_state['storage']['groupset']['dropdown'];
  }
   
  $form['groupset'] = array(
    '#type'   => 'fieldset',
    '#title'  => t('Fieldset'),
    '#prefix' => '<div id="group-wrapper">', // This is our wrapper div.
    '#suffix' => '</div>',
    '#tree'   => TRUE, // Don't forget to set #tree!
  );
  $form['groupset']['dropdown'] = array(
    '#type' => 'select',
    '#title' => t('Group'),
    '#options' => array('1' => 'group1', '2' => 'group2', '3' => 'group3' ),
    '#default_value' => $group_nid,
    '#ahah' => array(
      'event'   => 'change',
      // This is the "magical path". Note that the parameter is an array of
      // the parents of the form item of the wrapper div!
      'path'    => ahah_helper_path(array('groupset')),
      'wrapper' => 'group-wrapper',
    ),
  );
  $form['groupset']['update'] = array(
    '#type'  => 'submit',
    '#value' => t('Display'),
    // Note that we can simply use the generic submit callback provided by the
    // ahah_helper module here!
    // All it does, is set $form_state['rebuild'] = TRUE.
    '#submit' => array('ahah_helper_generic_submit'),
    // We set the 'no-js' class, which means this submit button will be hidden
    // automatically by Drupal if JS is enabled.
    '#attributes' => array('class' => 'no-js'),
    '#effect' => 'replace',
  );

  #display view

  //view name
  $viewName = 'league_standings';
  //pass $group_nid argument to view
  $view_content = views_embed_view($viewName, 'default', $group_nid);

  $form['groupset']['view'] = array(
   '#type' => 'markup',
   '#prefix' => '<div>',
   '#value' => $view_content,
   '#suffix' => '</div>',
  );

  return $form;
   
}