Allows modules to declare their own Forms API element types and specify their default values.

This hook allows modules to declare their own form element types and to specify their default values. The values returned by this hook will be merged with the elements returned by hook_form() implementations and so can return defaults for any Form APIs keys in addition to those explicitly mentioned below.

Each of the form element types defined by this hook is assumed to have a matching theme function, e.g. theme_elementtype(), which should be registered with hook_theme() as normal.

For more information about custom element types see the explanation at http://drupal.org/node/169815 .

Return value

An associative array describing the element types being defined. The array contains a sub-array for each element type, with the machine-readable type name as the key. Each sub-array has a number of possible attributes:

• "#input": boolean indicating whether or not this element carries a value (even if it's hidden).
• "#process": array of callback functions taking $element, $edit, $form_state, and $complete_form.
• "#after_build": array of callback functions taking $element and $form_state.
• "#validate": array of callback functions taking $form and $form_state.
• "#element_validate": array of callback functions taking $element and $form_state.
• "#pre_render": array of callback functions taking $element and $form_state.
• "#post_render": array of callback functions taking $element and $form_state.
• "#submit": array of callback functions taking $form and $form_state.

Related topics

File

documentation-6.x/developer/hooks/core.php, line 489

These are the hooks that are invoked by the Drupal core.

Code

function hook_elements() {
  $type['filter_format'] = array('#input' => TRUE);
  return $type;
}