我以某种形式建立了选择性的ELement。

    $parentId = $this -> createElement( select ,  parent_id );
    $parentId -> setLabel("Select a parent menu:")
                -> setRequired(true);
    $parentId->addMultiOption(0,  None );
    $this->addElement($parentId);

Its option have to loaded as per the value passed from the query String or URL. So, in my controller I fetched the values I required from the url and loaded extra item to the element, using following code

private function renderParentElement($menu_id, $parent = 0) {
    $mapper = $this -> mapper();
    $select = $mapper -> select();
    $select -> where("parent = ?", $parent)
            -> where("menu_id = ?", $menu_id);
    $menus = $mapper -> fetchAll($select);
    if($menus -> count() > 0) {
        foreach($menus as $menu) {
            $this -> form() -> getElement( parent_id ) -> addMultiOption($menu -> id, $menu -> label);
        }
    }
}

采用上述方法的行动方法是:

public function addAction()
{
    $menu = $this->_request->getParam( menu );

        $mapperMenu = new Application_Model_Mapper_Menu();
        $this -> view -> menu = $mapperMenu -> find($menu);

        if($this -> _request -> isPost() && $this -> form() -> isValid($_POST)) {
            $data = $this -> form() -> getValues();
            $menuItem = $this -> model();
            $menuItem -> setParent($data[ parent ]);
            $menuItem -> setMenu_id($data[ menu_id ]);
            $menuItem -> setLabel($data[ label ]);
            $menuItem -> setLink($data[ link ]);
            $menuItem -> setPage_id($data[ page_id ]);
            $this -> mapper() -> save($menuItem);

            $this -> _request -> setParam( menu , $data[ menu_id ]);
            $this -> _forward( index );
        }
        $this -> form() -> populate(array( menu_id  => $menu));
        $this -> renderParentElement($menu, 0);
        $this->view->form = $this -> form();
}

Now everything thing was working fine. The elements were loaded correctly and displaying correctly as well. But when I submitted it, the select box gives error as 1 is not found is the haystack, here 1 is the value of the item i selected, which is loaded from the controller.

请帮助我解决这一错误!