Floating a textfield next to a radio button

Hi Michael,

I think that You should use theme_form and theme_table to achieve this.

function myform_form(){
	$form['some_options'] = array(
		'#type' => 'radios',
		'#options' => array(
			1 => 'American',
			2 => 'German',
			/* change from 3 to other */
			'other' => 'Other:'
		),
	);

	$form['other'] = array(
		'#type' => 'textfield',
	);
	
	return $form;
}

function theme_myform_form($form){
	$table_data = array();
	$output = '';
	
	foreach(element_children($form['some_options']) as $name){
		if($name != 'other'){
			$table_data[] = array(
				/* put normal options to table */
				drupal_render($form['some_options'][$name])
			);
		} else {
			$table_data[] = array(
				drupal_render($form['some_options']['other']),
				drupal_render($form['other'])
				/* or drupal_render($form['some_options']['other']).' '.drupal_render($form['other']) to put it in one cell*/
			);
		}
		/**
		 * You can also put all to the $output without theme_table and then return it
		 * example:
		 * if($name != 'other'){
		 * 	$output .= '<p>'.drupal_render($form['some_options'][$name]).'</p>';
		 * } else {
		 * 	$output .= '<p>'.drupal_render($form['some_options'][$name]).' '.drupal_render($form['other']).'</p>';
		 * }
		 * 
		 * $output .= drupal_render($form);
		 * 
		 * return $output;
		 */ 
	}
	/* put your headers or leave it empty */
	$headers = array();
	
	$table = theme_table($headers,$table_data);
	
	/* send Your table to output */
	$output .= $table;
	
	/* to render all others element user drupal_render($form) */
	$output .= drupal_render($form);
	return $output;
}

Use CSS to make it float like you want it.

This can actually be done entirely with the Forms API. Here is an example:

// This will mimic the normal form element title as well as provide the group for our radio options.
$form['nations'] = array(
  '#type' => 'item',
  '#title' => t('Nationality'),
  '#description' => t('<Enter your field description here.>')
);

$form['nations']['american'] = array(
  '#type' => 'radio',
  '#title' => t('American'),
  '#default_value' => 1,                    // If there is a default value, this should also be specified for each radio button.
  '#return_value' => 1,
  '#parents' => array('nations'),           // You must specify this for each radio button for them to act as a group.
  '#prefix' => '<div class="form-radios">'  // The first radio button needs to make the style match a normal radios group.
);

$form['nations']['german'] = array(
  '#type' => 'radio',
  '#title' => t('German'),
  '#return_value' => 2,
  '#default_value' => 1,
  '#parents' => array('nations')
);

$form['nations']['other'] = array(
  // The 'container-inline' class places elements next to each other, while the 'form-item' class provides the correct spacing between options.
  '#prefix' => '<div class="container-inline form-item">',
  '#suffix' => '</div>'
);

// By supplying the title here, instead of using the '#field_prefix' property of the textfield, clicking the text will also select the radio button.
$form['nations']['other']['other_option'] = array(
  '#type' => 'radio',
  '#title' => t('Other:'),
  '#return_value' => 3,
  '#default_value' => 1,
  '#parents' => array('nations')
);

$form['nations']['other']['other_textfield'] = array(
  '#type' => 'textfield',
  '#default_value' => '',
  '#size' => 20,         // The default size is a bit large...
  '#suffix' => '</div>'  // End of the "form-radios" style.
);

In your validation and/or submit callbacks, the selected radio option will then be in $form_state['values']['nations'] and the textfield value will be in $form_state['values']['other_textfield'].

With a little more work, you can change the example so that you don't have to create each element manually.