joomla 2.5分页始终将起始限制设置为20

Question

I developed my own joomla 2.5 custom component for displaying data table in front-end.It contain filtering,paging and sorting.When navigate via paging it always shows only first 20. Is there any way to override limit of a query which generate on function getListQuery().

My populateState method is

protected function populateState($ordering = null, $direction = null) {
        // Initialise variables.
        $app = JFactory::getApplication();

        $search = $this->getUserStateFromRequest($this->context . '.filter.search', 'filter_search');
        $filter_order = $this->getUserStateFromRequest($this->context . '.filter_order', 'filter_order');
        //$filter_order = JRequest::getCmd('filter_order');
        $filter_order_Dir = $this->getUserStateFromRequest($this->context . '.filter_order_Dir', 'filter_order_Dir');
        //$filter_order_Dir = JRequest::getCmd('filter_order_Dir');

        'filter_region', '');

        $this->setState('filter_order', $filter_order);
        $this->setState('filter_order_Dir', $filter_order_Dir);


        // List state information
        $limit = $app->getUserStateFromRequest('global.list.limit', 'limit', $app->getCfg('list_limit'));
        $this->setState('list.limit', $limit);

        $limitstart = JRequest::getVar('limitstart', 0, '', 'int');
        $this->setState('list.start', $limitstart);

        parent::populateState();
    } 

Constructor method is

    function __construct() {
            parent::__construct();


            //Get configuration
            $app = JFactory::getApplication();
            $config = JFactory::getConfig();

            // Get the pagination request variables
            $this->setState('limit', $app->getUserStateFromRequest('com_jointcm.limit', 'limit', $config->getValue('config.list_limit'), 'int'));
            $this->setState('limitstart', JRequest::getVar('limitstart', 0, '', 'int'));
    }

List query method is

protected function getListQuery() {
        // Create a new query object.
        $db = JFactory::getDBO();
        $query = $db->getQuery(true);
 //code goes here...
..............

return $query;
}

Answer 1

After some digging around and taking a look at the source code of the JModelList class, I realized that problem is with \libraries\joomla\application\component\modellist.php file ,method name public function getItems(),line number 115.

I changed it to

public function getItems()
    {
        // Get a storage key.
        $store = $this->getStoreId();

        // Try to load the data from internal storage.
        if (isset($this->cache[$store]))
        {
            return $this->cache[$store];
        }

        // Load the list items.
        $query = $this->_getListQuery();
        //$items = $this->_getList($query, $this->getStart(), $this->getState('list.limit'));
$items = $this->_getList($query, $this->getState('limitstart'), $this->getState('list.limit'));

        // Check for a database error.
        if ($this->_db->getErrorNum())
        {
            $this->setError($this->_db->getErrorMsg());
            return false;
        }

        // Add the items to the internal cache.
        $this->cache[$store] = $items;

        return $this->cache[$store];
    }

Change was

$items = $this->_getList($query, $this->getStart(), $this->getState('list.limit'));

to

$items = $this->_getList($query, $this->getState('limitstart'), $this->getState('list.limit'));

It works fine.