Add jQuery to exposed filter form on drupal 7
Do like this:

function MY_MODULE_form_views_exposed_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  if ($form['#id'] == 'FORM-ID') {
    $form['#attached']['js'] = array(
      drupal_get_path('module', 'MY_MODULE') . '/js/SCRIPT.js' =&gt; array(
        'type' =&gt; 'file',
        'group' =&gt; JS_LIBRARY, // or JS_DEFAULT, JS_THEME.. read this -  https://api.drupal.org/api/drupal/includes!common.inc/function/drupal_add_js/7
      ),
    );
  }
}