#states required is not working in form API

Hi There,

I want to use dependant text field with checkbox in drupal form.

I am using form #states with required, but form gets submitted without validating the text field.

Please check below code.

$form['dummy_checkbox'] = array(
    '#type' => 'checkbox',
    '#title' => t('Dummy Checkbox'),
  );

  $form['dummy_checkbox_value'] = array(
    '#type' => 'textfield',
    '#title' => t('Dummy Checkbox Value'),
    '#states' => array(
      'visible' => array(
        ':input[name="dummy_checkbox"]' => array('checked' => TRUE)
      ),
      'required' => array(
        ':input[name="dummy_checkbox"]' => array('checked' => TRUE)
      ),
    )
  );

  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Submit',
  );

Note : I have option to write validate function, but my checkbox and text field are multiple. So I need to work with #states only.