How to add a Total row in a magento grid

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class *** extends Mage_Adminhtml_Block_Widget_Grid
{
    protected $_countTotals = true;

    public function getTotals()
    {
        $totals = new Varien_Object();
        $fields = array(
            ‘uzkart_trans_amount‘ => 0, //actual column index, see _prepareColumns()
            ‘some_summarable_field‘ => 0,
            ‘another_countable_field‘ => 0,
        );
        foreach ($this->getCollection() as $item) {
            foreach($fields as $field=>$value){
                $fields[$field]+=$item->getData($field);
            }
        }
        //First column in the grid
        $fields[‘entity_id‘]=‘Totals‘;
        $totals->setData($fields);
        return $totals;
    }

    protected function _prepareColumns()
    {
        /**
         * another columns
         */

        $this->addColumn(‘uzkart_trans_amount‘, array(
            ‘header‘ => Mage::helper(‘uzkart‘)->__(‘Payment Amount‘),
            ‘index‘ => ‘uzkart_trans_amount‘,
            ‘type‘ => ‘currency‘,
        ));

        /**
         * another columns
         */
    }

    /**
     * another methods
     */

}

How to add a Total row in a magento grid

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原文地址：http://my.oschina.net/liufeng815/blog/505926