Drupal 7 Module Development

Drupal’s Theme Layer
• #suffix: A string containing markup to be appended to the
#children property.
• #weight: A number used to sort child elements.
• #sorted: A Boolean indicating if the child elements have already been
sorted. Since sorting a render array is expensive, if you know the data is
already sorted (for example, the data was sorted when retrieved from the
database), you should set this property to TRUE.
• #states: JavaScript state information.
• #attached: An array of CSS, JavaScript, libraries, or other associated
attachments related to the element. See drupal_process_attached()
for more information.
• #printed: A Boolean indicating if the element has already been rendered.
hook_element_info
The second place properties are defined is inside hook_element_info().
Each #type of render element needs to be defined in an implementation of
hook_element_info(). system_element_info() defines most of Drupal core's
render elements, which include several useful elements such as the markup element,
the link element, and all the form elements. The following is a short snippet from
system_element_info():
/**
* Implements hook_element_info().
*/
function system_element_info() {
// HTML markup.
$types['markup'] = array(
'#markup' => '',
'#pre_render' => array('drupal_pre_render_markup'),
);
// A HTML link.
$types['link'] = array(
'#pre_render' => array('drupal_pre_render_link',
'drupal_pre_render_markup'),
);
// A hidden form element.
$types['hidden'] = array(
'#input' => TRUE,
'#process' => array('ajax_process_form'),
'#theme' => 'hidden',
);
}
return $types;
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