Form builder: Builds a form that triggers a simple AJAX callback.
function ajax_forms_test_lazy_load_form($form, &$form_state) {
$form['add_files'] = array(
'#type' => 'checkbox',
'#default_value' => FALSE,
);
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Submit'),
'#ajax' => array(
'wrapper' => 'ajax-forms-test-lazy-load-ajax-wrapper',
'callback' => 'ajax_forms_test_lazy_load_form_ajax',
),
'#prefix' => '<div id="ajax-forms-test-lazy-load-ajax-wrapper"></div>',
);
return $form;
}