Question

I am trying to create a filtering form for a Drupal module that show hours. I am trying to get a date field to only show if the user wants to filter by it. I have a text field further down in the code that is hiding. I am not sure what I should do. Here is my code for the field:

$form['filters']['start-do'] = array(
    '#type' => 'checkbox',
    '#title' => t('Filter by start date'),
);

$form['filters']['start'] = array(
    '#type' => 'date',
    '#title' => t('Start Date'),
    '#description' => t('Show hours that started after this date.'),
    '#states' => array(
        'invisible' => array(
            ':input[name="start-do"]' => array('checked' => FALSE) 
        )    
    )
);

Answer 1

You have forgotten about “container” type form element in your example.

Try something like this:

$form['filters']['start-do'] = array(
  '#type' => 'checkbox',
  '#title' => t('Filter by start date'),
);
$form['filters']['container'] = array(
  '#type' => 'container',
  '#states' => array(
    'invisible' => array(
      'input[name="start-do"]' => array('checked' => FALSE)
    )
  )
);
$form['filters']['container']['start'] = array(
  '#type' => 'date',
  '#title' => t('Start Date'),
  '#description' => t('Show hours that started after this date.'),
);

It’s always worth to check Forms API reference: http://api.drupal.org/api/drupal/developer–topics–forms_api_reference.html/7#states