function ajax_example_dependent_dropdown_callback

Selects just the second dropdown to be returned for re-rendering.

Since the controlling logic for populating the form is in the form builder function, all we do here is select the element and return it to be updated.

Return value

array Renderable array (the second dropdown)

Related topics

Example: AJAX
These examples show basic AJAX concepts.
1 string reference to 'ajax_example_dependent_dropdown_callback'
ajax_example_dependent_dropdown in ajax_example/ajax_example.module
AJAX-based dropdown example form.

File

ajax_example/ajax_example.module, line 614

Code

function ajax_example_dependent_dropdown_callback($form, $form_state) {
    return $form['dropdown_second'];
}