Фокус события на выборе с материализацией

Я хочу добавить class, когда у select есть eventselect, это мой код:

$("form").find("input,select").on('focus',function(){
     $(this).addClass("focus");
});
$("form").find("input,select").on('blur',function(){
     $(this).removeClass("focus");
});

Это мой HTML:

            <form id = "formEdit" method = "post" action = "<?=current_url();?>" enctype = "multipart/form-data">
                  <div class = "form-pad">
                     <div class = "row">
                        <!--<div class = "col s12 m8 push-m4">-->
                          <div class = "col s12">
                          <div class = "input-field">
                              <input id = "nombre" name = "nombre" type = "text" class = "validate"  onkeypress = "return valid_text(event)" maxlength = "20" value = "<?=$nombre;?>" required>
                              <input name = "userID" type = "hidden" value = "<?=$userID;?>">
                              <input name = "status" type = "hidden" value = "<?=$status;?>">
                              <label for = "nombre" class = "active">Nombres</label>
                           </div>
                           <div class = "input-field">
                              <input name = "apellidos" type = "text" class = "validate"  onkeypress = "return valid_text(event)" maxlength = "30" value = "<?=$apellidos;?>" required>
                              <label for = "apellidos" class = "active">Apellidos</label>
                           </div> 
                           <div class = "input-field">
                              <input name = "email" type = "email" class = "validate"  maxlength = "49" value = "<?=$correo;?>" required>
                              <label for = "email" class = "active">Correo Electrónico</label>
                           </div>                           
                           <div class = "input-field">
                              <select id = "select_privilegios" name = "FK_id_rol" required>
                                 <?=($id_rol=='') ? '<option value = "" disabled selected>Seleccionar</option>': ''?>
                                <?php
                                  foreach ($roles as $role) {
                                    echo '<option value = "'.$role->roleId.'" '.(($id_rol == (int)$role->roleId) ? 'selected': '').'>'.$role->role.'</option>';
                                  }
                                ?>
                              </select>
                              <label>Privilegios</label>
                           </div>                    
                           <div id = "div_empresas" class = "input-field">
                              <select name = "id_empresa[]" id = "select_empresas" multiple required>
                                <?php
                                $ids = array_map(function($e) {
                                  return is_object($e) ? $e->id_empresa : $e['id_empresa'];
                                  }, $id_empresa);

                                  foreach ($empresas as $empresa) { 
                                    echo '<option value = "'.$empresa->id_empresa.'" '.(in_array($empresa->id_empresa, $ids) ? 'selected': '').'>'.$empresa->nombre .'</option>';                                   
                                  }
                                ?>
                                </select>
                              <label>Empresas</label>
                           </div>                                                 


                        </div>
                     </div>
                     <!-- Save Cancelar -->
                     <div class = "row">
                        <div class = "col s12 m12 l12 buttons" style = "padding: 0">
                            <div id = "botones">
                                <button class = "waves-effect waves-light btn" type = "submit" name = "action1"><i class = "material-icons right">done</i>Guardar</button>
                                <?php if ($userID>0): ?>
                                <span  href = "#warningModal" class = "modal-trigger waves-effect waves-light btn <?=($status)? "red lighten-1" : "blue darken-4";?>"><i class = "material-icons right"><?=($status)? "delete" : "lock_open";?></i><?=($status)? "Eliminar" : "Habilitar";?></span>
                                <button type = "submit" name = "action2" class = "hide"></button>
                                <?php endif; ?>
                                <a href = "<?php echo base_url(); ?>/usuarios" id = "cancelar" class = "waves-effect waves-light btn blue-grey lighten-2"><i class = "material-icons right">clear</i>Cancelar</a>
                            </div> 
                        </div>
                     </div>
                  </div>
               </form>

Этот код очень хорошо работает в input text или других типах input, но в select элементы не обнаруживают событие фокуса. Если бы кто-нибудь мог мне помочь, Я был бы очень признателен.