The name of element in the #process callback (Drupal)

I'm trying to create a new form element representing the bbcode editor, which is a compound object of the toolbar and native textarea 开发者_如何学Celement. So my hook_element_info() looks like:

function bbeditor_element_info() {
    $type['bbeditor'] = array(
        '#input' => TRUE,
        '#cols' => 60,
        '#rows' => 5,
        '#resizable' => TRUE,
        '#process' => array('process_bbeditor'),
        '#theme_wrappers' => array('bbeditor', 'form_element'),
    );
    return $type;
}

But how do I get the name of element in the process function to passthrough it into the nested textarea element?

function process_bbeditor($element, &$form_state) {
    ...
    // Insert the textarea element as a child.
    $name = 'textarea'; // <------------- How do I get the name?
    $element[$name] = $textarea;
    return $element;
}

$form_state variable store the information of form's state (means you can use this variable to get the value of form element)

Like :

$form_state['element_name']['value']; 

This will give you the value for form element. i'm not very sure that $form_state['element_name'] will give you the name of the element or it may return array.

Please check by using

var_dump($form_state['element_name']);

in your hook what it print

function process_bbeditor($element, &$form_state) {
    ...

    var_dump($form_state['element_name']);
}

Ok, being aware that this may be a bit late for the OP, I just want to add an answer for the benefit of those that may stumble upon this :)

Assuming you are on a drupal 7 installation:

$element['#name'] 

contains the name of the element, provided it has a name. It will automatically receive a name if rendered via drupal_get_form, in which case it receives the name of the corresponding array element in the initial form array. It is also possible to set the #name attribute directly, e.g.

$form['bbeditor_test'] = array(
  '#type' => 'bbeditor',
  '#name' => 'use-this-name',
  // some more stuff ....
);

It often makes sense to re-use a _process callback for custom fields defined for Drupal's field API (i.e. when defining fields via hook_field_info and related hooks). In such scenarios note, that the name of the element is not contained in the #name attribute but in the #field_name attribute.

So, assuming process_bbeditor is also used for the field API fields we would have something like:

function process_bbeditor($element, &$form_state,$form) {
  // some stuff ...
  $element_name = ''; 
  if (isset($element['#name'])) {
    $element_name = $element['#name'];
  }
  elseif (isset($element['#field_name'])) {
    $element_name = $element['#field_name'];
  }
  else {  // to handle the rare case when drupal_render is called directly on the parent array and #name isn't set
    $element_name = 'undefined';
  }
  // some more stuff using $element_name ....
  return $element;
}