dupal form: how to assign specific id to radio button using form api

Question

I wanted to change id of radio button. But i dont know which attribute shall i use to do that.

$form['entry.497535900'] = array(
'#type' => 'radios',
'#title' => t('Category'),
'#options' => array('P' =>'Product','S' => 'Services','O' =>'Others'),

);

Answer 1

If you need to assign IDs to each radio option, then you can use custom theme function, to theme your radios. See example:

$form['entry.497535900'] = array(
  '#type' => 'radios',
  '#title' => t('Category'),
  '#options' => array('P' =>'Product','S' => 'Services','O' =>'Others'),
  '#theme' => 'mymodule_custom_radios',  
);

The #theme parameter specifies function, which overrides the default radios styling function. You will need to define this function in hook_theme() and create the content of the function, where you can specify, how radios should be rendered.

/**
 * Implements hook_theme.
 */
function mymodule_theme($existing, $type, $theme, $path) {
  return array(
    'mymodule_custom_radios' => array(
      'arguments' => array('element' => NULL),
    ),
  );
}

Then create the content of this function.

function theme_mymodule_custom_radios($element) {
  // You can access all radios options like this - $element['#options'];

  $output = '';
  // ... create html output according to your needs
  return $output;
}

Answer 2

'#attributes' => array(
    'id' => 'your-id',
 ),

You need use "#attributes".