如何让Drupal将AHAH行为添加到通过AHAH返回的表单元素中？

Question

所以我想做的是：

1.创建并呈现以下表单元素：

    $form['rb_download_' . $doc_id] = array(
      '#type' => 'submit',
      '#name' => 'doc_' . $doc_id,
      '#prefix' => "<div id='rb_doc_order_{$doc_id}'>",
      '#suffix' => '</div>',
      '#value' =>variable_get('rb_order_button', "buyOnline"),
      '#ahah'  => array(
         'event' => 'click',
         'path'  => "rb/case/doc_order_js/$case->nid/$doc_id",
         'wrapper' => "rb_doc_order_{$doc_id}",
         'effect' => 'fade',),
    );

2.动作函数返回并用一个新元素替换上面的元素：

function rb_case_doc_order_js($case, $doc_id) {

  $button['rb_download_' . $doc_id] = array(

        '#type'         => 'submit',
        '#name'         => 'doc_' . $doc_id,
        '#prefix'       => "<div id='rb_doc_order_{$doc_id}'>",
        '#suffix'       => '</div>',
        '#value'        => variable_get('rb_order_confirm', "Remove from cart"),
  //'#attributes' => array('class' => 'ahah-processed'),
        '#ahah'         => array(

           'event'      => 'click',
           'path'       => "rb/case/doc_unorder_js/$case->nid/$doc_id",
           'wrapper'    => "rb_doc_order_{$doc_id}",
           'effect'     => 'fade',),

  );

  $output .= drupal_render($button);
  $output .= "<script type='text/javascript'>\n";
  $output .= "cart_block_item_count($count);\n";
  $output .= "Drupal.ahah;\n";
  $output .= "</script>\n";

  print drupal_json($output);

}

结果是，旧按钮被上面的按钮替换，但是新按钮没有启用AJAX .

要使新返回的元素AHAH 就绪，需要做什么？

Answer 1

嗯，我不知道怎么让这个文件做上面的事情。但我确实想出了一个解决办法(在我的例子中，这涉及在客户端的submit元素对象的两个不同值之间切换，这样它的AHAH行为就不会丢失)。在服务器端，我只检查不同的值，并根据结果执行操作：

1.根据条件定义具有不同值的元素

  if (empty($rb_item) ||($rb_item['node_checkout_nid'] != $node_checkout_nid)) {
    //if (true) {
    $form['rb_download_' . $doc_id] = array(
      '#type'   => 'submit',
      '#name'   => 'doc_' . $doc_id,
      '#prefix' => "<div id='rb_doc_download_{$doc_id}'>",
      '#suffix' => '</div>',
      '#value'  => variable_get('rb_doc_download_button', "buyOnline"),
      '#ahah'   => array(
         'event'   => 'click',
         'path'    => "rb/case/doc_download_js/$case->nid/$doc_id",
         'wrapper' => "rb_doc_download_{$doc_id}",
         'effect'  => 'none',
         'method'  => 'append',
    ),
    );
    unset($_SESSION['rb_case']['rb_dowload_' . $doc_id]);
  }
  else {
    $form['rb_download_' . $doc_id] = array(
      '#type' => 'submit',
      '#name' => 'doc_' . $doc_id,
      '#prefix' => "<div id='rb_doc_download_{$doc_id}'>",
      '#suffix' => '</div>',
      '#value' => variable_get('rb_return_button', "Remove from cart"),
      '#ahah'  => array(
         'event' => 'click',
         'path'  => "rb/case/doc_download_js/$case->nid/$doc_id",
         'wrapper' => "rb_doc_download_{$doc_id}",
         'effect'  => 'none',
         'method'  => 'append',
    ),
    );
  }

操作函数检查表单的值，并返回元素：的切换值。

function rb_case_doc_download_js($case, $doc_id) {

  //Add code that will change how the form elements are rendered here ...

  //Now get form with possible new values and send toggle value back to the javascript on client side.

  $form_state = array('storage' => NULL, 'submitted' => FALSE);
  $form_build_id = $_POST['form_build_id'];
  $form = form_get_cache($form_build_id, $form_state);

  $args = $form['#parameters'];
  $form_id = array_shift($args);
  $form_state['post'] = $form['#post'] = $_POST;
  $form['#programmed'] = $form['#redirect'] = FALSE;

  //Toggle the form element value between <<Add to Cart>> and <<Remove from Cart>>
  $toggle_on  = variable_get('rb_doc_download_button', "buyOnline");
  $toggle_off = variable_get('rb_return_button', "Remove from cart");
  if ($form['rb_download_' . $doc_id]['#value'] == $toggle_on) {
    $toggle = $toggle_off;
    $form['rb_download_' . $doc_id]['#value'] = $toggle;
  }
  else {
    $toggle = $toggle_on;
    $form['rb_download_' . $doc_id]['#value'] = $toggle;
  }

  drupal_process_form($form_id, $form, $form_state);
  $form = drupal_rebuild_form($form_id, $form_state, $args, $form_build_id);

  $output .= "<script type='text/javascript'>\n";
  $output .= "cart_block_item_count($count);\n";
  $output .= "rb_button_toggle('rb_doc_download_{$doc_id}', '$toggle');\n";
  $output .= "</script>\n";

  print drupal_json($output);

}

3.客户端的JavaScript函数更改元素的值，但对象保持其AJAX行为：

  /**
   * Change the button name
   */
  function rb_button_toggle(target, name) {
    alert(target);
    alert(name);
    if (target && name) {
      $(':submit', document.getElementById(target)).attr('value', name);
    }
  }

4.这对我有用:)

如果您能够解决这个问题，可以随意添加上面的解决方案。