'radios',
'#options' => array(
'high_school' => t('High School'),
'undergraduate' => t('Undergraduate'),
'graduate' => t('Graduate'),
),
'#title' => t('What type of student are you?')
);
$form['high_school'] = array(
'#type' => 'fieldset',
'#title' => t('High School Information'),
// This #states rule says that the "high school" fieldset should only
// be shown if the "student_type" form element is set to "High School".
'#states' => array(
'visible' => array(
':input[name="student_type"]' => array('value' => 'high_school'),
),
),
);
// High school information.
$form['high_school']['tests_taken'] = array(
'#type' => 'checkboxes',
'#options' => drupal_map_assoc(array(t('SAT'), t('ACT'))),
'#title' => t('What standardized tests did you take?'),
// This #states rule says that this checkboxes array will be visible only
// when $form['student_type'] is set to t('High School').
// It uses the jQuery selector :input[name=student_type] to choose the
// element which triggers the behavior, and then defines the "High School"
// value as the one that triggers visibility.
'#states' => array(
'visible' => array( // action to take.
':input[name="student_type"]' => array('value' => 'high_school'),
),
),
);
$form['high_school']['sat_score'] = array(
'#type' => 'textfield',
'#title' => t('Your SAT score:'),
'#size' => 4,
// This #states rule limits visibility to when the $form['tests_taken']
// 'SAT' checkbox is checked."
'#states' => array(
'visible' => array( // action to take.
':input[name="tests_taken[SAT]"]' => array('checked' => TRUE),
),
),
);
$form['high_school']['act_score'] = array(
'#type' => 'textfield',
'#title' => t('Your ACT score:'),
'#size' => 4,
// Set this element visible if the ACT checkbox above is checked.
'#states' => array(
'visible' => array( // action to take.
':input[name="tests_taken[ACT]"]' => array('checked' => TRUE),
),
),
);
// Undergrad information.
$form['undergraduate'] = array(
'#type' => 'fieldset',
'#title' => t('Undergraduate Information'),
// This #states rule says that the "undergraduate" fieldset should only
// be shown if the "student_type" form element is set to "Undergraduate".
'#states' => array(
'visible' => array(
':input[name="student_type"]' => array('value' => 'undergraduate'),
),
),
);
$form['undergraduate']['how_many_years'] = array(
'#type' => 'select',
'#title' => t('How many years have you completed?'),
// The options here are integers, but since all the action here happens
// using the DOM on the client, we will have to use strings to work with
// them.
'#options' => array(
1 => t('One'),
2 => t('Two'),
3 => t('Three'),
4 => t('Four'),
5 => t('Lots'),
),
);
$form['undergraduate']['comment'] = array(
'#type' => 'item',
'#description' => t("Wow, that's a long time."),
'#states' => array(
'visible' => array(
// Note that '5' must be used here instead of the integer 5.
// The information is coming from the DOM as a string.
':input[name="how_many_years"]' => array('value' => '5'),
),
),
);
$form['undergraduate']['school_name'] = array(
'#type' => 'textfield',
'#title' => t('Your college or university:'),
);
$form['undergraduate']['school_country'] = array(
'#type' => 'select',
'#options' => drupal_map_assoc(array(t('UK'), t('Other'))),
'#title' => t('In what country is your college or university located?'),
);
$form['undergraduate']['country_writein'] = array(
'#type' => 'textfield',
'#size' => 20,
'#title' => t('Please enter the name of the country where your college or university is located.'),
// Only show this field if school_country is set to 'Other'.
'#states' => array(
'visible' => array( // Action to take: Make visible.
':input[name="school_country"]' => array('value' => t('Other')),
),
),
);
$form['undergraduate']['thanks'] = array(
'#type' => 'item',
'#description' => t('Thanks for providing both your school and your country.'),
'#states' => array(
// Here visibility requires that two separate conditions be true.
'visible' => array(
'input[name="school_country"]' => array('value' => t('Other')),
'input[name="country_writein"]' => array('filled' => TRUE),
),
),
);
$form['undergraduate']['go_away'] = array(
'#type' => 'submit',
'#value' => t('Done with form'),
'#states' => array(
// Here visibility requires that two separate conditions be true.
'visible' => array(
'input[name="school_country"]' => array('value' => t('Other')),
'input[name="country_writein"]' => array('filled' => TRUE),
),
),
);
// Graduate student information.
$form['graduate'] = array(
'#type' => 'fieldset',
'#title' => t('Graduate School Information'),
// This #states rule says that the "graduate" fieldset should only
// be shown if the "student_type" form element is set to "Graduate".
'#states' => array(
'visible' => array(
':input[name="student_type"]' => array('value' => 'graduate'),
),
),
);
$form['graduate']['more_info'] = array(
'#type' => 'textarea',
'#title' => t('Please describe your graduate studies'),
);
$form['graduate']['info_provide'] = array(
'#type' => 'checkbox',
'#title' => t('Check here if you have provided information above'),
'#disabled' => TRUE,
'#states' => array(
// Mark this checkbox checked if the "more_info" textarea has something
// in it, if it's 'filled'.
'checked' => array( // Action to take: check the checkbox.
':input[name="more_info"]' => array('filled' => TRUE),
),
),
);
$form['expand_more_info'] = array(
'#type' => 'checkbox',
'#title' => t('Check here if you want to add more information.'),
);
$form['more_info'] = array(
'#type' => 'fieldset',
'#title' => t('Additional Information'),
'#collapsible' => TRUE,
'#collapsed' => TRUE,
// Expand the expand_more_info fieldset if the box is checked.
'#states' => array(
'expanded' => array(
':input[name="expand_more_info"]' => array('checked' => TRUE),
),
),
);
$form['more_info']['feedback'] = array(
'#type' => 'textarea',
'#title' => t('What do you have to say?'),
);
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Submit your information'),
);
return $form;
} 
