drupal questions - how to print a form from another module? - forms

Question

I'm trying to include a module form in a panel and I've tried using drupal_get_form(), but not sure I'm using it correctly.
In the organic groups module, there's a function to render an og_broadcast_form. It's called within a page_callback in og.module:
// Broadcast tab on group node.
$items['node/%node/broadcast'] = array(
'title' => 'Broadcast',
'page callback' => 'drupal_get_form',
'page arguments' => array('og_broadcast_form', 1),
'access callback' => 'og_broadcast_access',
'access arguments' => array(1),
'type' => MENU_LOCAL_TASK,
'file' => 'og.pages.inc',
'weight' => 7
);
And in og.pages.inc, the function is:
function og_broadcast_form($form_state, $node) {
drupal_set_title(t('Send message to %group', array('%group' => $node->title)));
if (!empty($form_state['post'])) {
drupal_set_message(t('Your message will be sent to all members of this group.'));
}
$form['subject'] = array(
'#type' => 'textfield',
'#title' => t('Subject'),
'#size' => 70,
'#maxlength' => 250,
'#description' => t('Enter a subject for your message.'),
'#required' => TRUE,
);
$form['body'] = array(
'#type' => 'textarea',
'#title' => t('Body'),
'#rows' => 5,
'#cols' => 90,
'#description' => t('Enter a body for your message.'),
'#required' => TRUE
);
$form['send'] = array('#type' => 'submit', '#value' => t('Send message'));
$form['gid'] = array('#type' => 'value', '#value' => $node->nid);
return $form;
}
I've tried a number of variations of drupal_get_form:
print drupal_get_form('og_broadcast_form', NULL, arg(1)); //where arg 1 is the node id from the url
print drupal_get_form('og_broadcast_form');
print drupal_get_form('og_broadcast_form', &$form_state, arg(1));
print drupal_get_form('og_broadcast_form', $n); //where $n is node_load(arg(1));
print drupal_get_form('og_broadcast_form', &$form_state, $n);
etc., etc... Is there a way to accomplish what I'm trying to do here?

Answer 1

FYI.. your problem is that you're attempting to load a form located in another modules include file.
The function is located in og.pages.inc and you'll need to make a call to:
module_load_include('inc', 'og', 'og.pages');
This must be done before you can grab the form.

Answer 2

If drupal_get_form is given the name of a function as it's first argument, that will be both the form_id and a function to be called to generate the $form array.
On line 3 of the function code, we have $args = func_get_args();, this is used by drupal_get_form to collect any or all additional arguments you may want to pass to your form-building function.
You should be using drupal_get_form('og_broadcast_form', node_load(arg(1)));.
Are you sure you should be using print and not return? I have recently learned they do very different things in the theming system. I have used drupal_get_form in this way to populate the contents of a block successfully, but at no point did I print to the screen myself.
EDIT: The full node object and not the nid because %node in a menu path uses a wildcard loader to pass the node_load(arg(1)) on to whatever function is being called.

Answer 3

drupal_get_form gets the form for you. have you tried print drupal_render(drupal_get_form('whatever'))) ?

Answer 4

drupal_get_form() only accepts one argument, the $form_id.
http://api.drupal.org/api/function/drupal_get_form/6
Run a hook_form_alter() and var_dump($form_id). That will give you the $form_id, and when you pass that to drupal_get_form(), it should return the rendered form.